LM25061PMME-2/NOPB - Texas Instruments

Power

Good

UVLO/EN

PWRGNDTIMER

PGD

OUT

VIN SENSE GATE

LM25061

VOUT

VSYS

FB VPGD

GND

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

LM25061 Positive Low Voltage Power Limiting Hot Swap Controller

Check for Samples: LM25061

1FEATURES APPLICATIONS

2• Operating Range: +2.9V to +17V • Server Backplane Systems

• In-rush Current Limit for Safe Board Insertion • Base Station Power Distribution Systems

into Live Power Sources • Solid State Circuit Breaker

• Programmable Maximum Power Dissipation in

the External Pass Device PACKAGE

• Adjustable Current Limit • VSSOP-10

• Circuit Breaker Function for Severe Over- DESCRIPTION

Current Events The LM25061 positive hot swap controller provides

• Internal High Side Charge Pump and Gate intelligent control of the power supply voltage to the

Driver for External N-Channel MOSFET load during insertion and removal of circuit cards from

• Adjustable Under-Voltage Lockout (UVLO) and a live system backplane or other "hot" power sources.

Hysteresis The LM25061 provides in-rush current control to limit

• Adjustable Output Voltage Monitoring and system voltage droop and transients. The current limit

and power dissipation in the external series pass N-

Hysteresis Channel MOSFET are programmable, ensuring

• Initial Insertion Timer Allows Ringing and operation within the Safe Operating Area (SOA). The

Transients to Subside After System POWER GOOD output indicates when the output

Connection voltage exceeds a programmable threshold. The

• Programmable Fault Timer Avoids Nuisance input under-voltage level and hysteresis are

Trips programmable, as well as the initial insertion delay

time and fault detection time. The LM25061-1 latches

• Active High Open Drain POWER GOOD Output off after a fault detection, while the LM25061-2

• Available in Latched Fault and Automatic automatically restarts at a fixed duty cycle. The

Restart Versions LM25061 is available in a 10 pin VSSOP package.

Typical Application

Figure 1. Positive Power Supply Control

1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

UVLO/EN

FB PWR

GND TIMER

PGD

OUTVIN

SENSE GATE

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

Connection Diagram

Figure 2. Top View

10-Lead VSSOP

PIN DESCRIPTIONS

Pin # Name Description Applications Information

1 SENSE Current sense input The voltage across the current sense resistor (RS) is measured from VIN to this pin. If

the voltage across RSreaches 50mV the load current is limited and the fault timer

activates.

2 VIN Positive supply input A small ceramic bypass capacitor close to this pin is recommended to suppress

transients which occur when the load current is switched off.

3 UVLO/EN Under-voltage lockout An external resistor divider from the system input voltage sets the under-voltage turn-

on threshold. An internal 20 µA current source provides hysteresis. The enable

threshold at the pin is 1.17V. This pin can also be used for remote shutdown control.

4 FB Output feedback An external resistor divider from the output sets the output voltage at which the PGD

pin switches. The threshold at the pin is 1.17V. An internal 22 µA current source

provides hysteresis.

5 GND Circuit ground

6 TIMER Timing capacitor An external capacitor connected to this pin sets the insertion time delay and the Fault

Timeout Period. The capacitor also sets the restart timing of the LM25061-2.

7 PWR Power limit set An external resistor connected to this pin, in conjunction with the current sense resistor

(RS), sets the maximum power dissipation allowed in the external series pass

MOSFET.

8 PGD Power Good indicator An open drain output. This output is high when the voltages at the FB pin and at the

UVLO pin are above their thresholds.

9 OUT Output feedback Connect to the output rail (external MOSFET source). Internally used to determine the

MOSFET VDS voltage for power limiting.

10 GATE Gate drive output Connect to the external MOSFET’s gate. This pin's voltage is limited at 19.5V above

ground.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Product Folder Links: LM25061

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

Absolute Maximum Ratings(1)(2)(3)

VIN to GND(4) -0.3V to 20V

SENSE, OUT, PGD to GND -0.3V to 20V

UVLO to GND -0.3V to 20V

FB to GND -0.3V to 20V

VIN to SENSE -0.3V to +0.3V

ESD Rating(5) Human Body Model 2kV

Storage Temperature -65°C to +150°C

Junction Temperature +150°C

Lead Temperature (soldering 4 sec) +260°C

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and conditions

see the Electrical Characteristics.

(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.

(3) For detailed information on soldering plastic VSSOP packages refer to the Packaging Databook available from Texas Instruments.

(4) Current out of a pin is indicated as a negative number.

(5) The human body model is a 100 pF capacitor discharged through a 1.5 kΩresistor into each pin.

Operating Ratings

VIN Supply Voltage +2.9V to 17V

PGD Off Voltage 0V to 17V

Junction Temp. Range −40°C to +85°C

Electrical Characteristics

Limits in standard type are for TJ= 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C

to +85°C. Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical values represent

the most likely parametric norm at TJ= 25°C, and are provided for reference purposes only. Unless otherwise stated the

following conditions apply: VIN = 12V.

Symbol Parameter Conditions Min. Typ. Max. Units

Input (VIN pin)

IIN-EN Input Current, enabled UVLO = 2V, VIN = 14V 1.6 2.4 mA

IIN-DIS Input Current, disabled UVLO = 0.7V 1.0 1.6 mA

POR Power On Reset threshold at VIN VIN Increasing 2.6 2.8 V

PORHYS POR hysteresis VIN decreasing 150 mV

OUT pin

IOUT-EN OUT bias current, enabled OUT = VIN, Normal operation 0.30 µA

IOUT-DIS OUT bias current, disabled(1) Disabled, OUT = 0V, SENSE = VIN -12

UVLO pin

UVLOTH UVLO threshold 1.154 1.17 1.183 V

UVLOHYS UVLO hysteresis current UVLO = 1V 15 20 26 µA

UVLODEL UVLO delay Delay to GATE high 15 µs

Delay to GATE low 8.3

UVLOBIAS UVLO bias current UVLO = 3V 1µA

Power Limit (PWR pin)

PWRLIM-1 Power limit sense voltage (VIN-SENSE) SENSE-OUT = 12V, RPWR = 69.8 kΩ19 25 31 mV

PWRLIM-2 SENSE-OUT = 6V, RPWR = 34.8 kΩ19 25 31 mV

IPWR PWR pin current VPWR = 2.5V -15 µA

RSAT(PWR) PWR pin impedance when disabled UVLO = 0.7V 140 Ω

(1) OUT bias current (disabled) due to leakage current through an internal 1.0 MΩresistance from SENSE to VOUT.

Product Folder Links: LM25061

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

Electrical Characteristics (continued)

Limits in standard type are for TJ= 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C

to +85°C. Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical values represent

the most likely parametric norm at TJ= 25°C, and are provided for reference purposes only. Unless otherwise stated the

following conditions apply: VIN = 12V.

Symbol Parameter Conditions Min. Typ. Max. Units

Gate Control (GATE pin)

IGATE Source current Normal Operation -27 -20 -13 µA

Sink current UVLO = 1V 1.5 22.7 mA

VIN - SENSE = 150 mV or VIN < 160 260 375 mA

POR, VGATE = 5V

VGATE Gate output voltage in normal operation GATE voltage with respect to ground 18 19.5 21 V

Current Limit

VCL Threshold voltage VIN-SENSE voltage 45 50 55 mV

tCL Response time VIN-SENSE stepped from 0 mV to 15 µs

80 mV

ISENSE SENSE input current Enabled, SENSE = OUT 23 µA

Disabled, OUT = 0V 12

Enabled, OUT = 0V 62

Circuit Breaker

VCB Threshold voltage VIN - SENSE 75 95 110 mV

tCB Response time VIN - SENSE stepped from 0 mV to 0.19 0.36 µs

150 mV, time to GATE low, no load

Timer (TIMER pin)

VTMRH Upper threshold 1.60 1.72 1.85 V

VTMRL Lower threshold Restart cycles (LM25061-2) 0.9 1.0 1.1 V

End of 8th cycle (LM25061-2) 0.3 V

Re-enable Threshold (LM25061-1) 0.3 V

ITIMER Insertion time current -7.5 -5.5 -3.5 µA

Sink current, end of insertion time TIMER pin = 2V 1.5 22.5 mA

Fault detection current -110 -80 -50 µA

Fault sink current 1.6 2.5 3.4 µA

DCFAULT Fault Restart Duty Cycle LM25061-2 only 0.67 %

tFAULT Fault to GATE low delay TIMER pin reaches the upper 20 µs

threshold

FB Pin

FBTH FB threshold UVLO = 2V 1.145 1.17 1.195 V

FBHYS FB hysteresis current FB = 2V -28 -22 -17 µA

FBDEL FB delay Delay to PGD high 100 ns

Delay to PGD low 110

FBBIAS FB bias current FB = 1V 1µA

Power Good (PGD pin)

PGDVOL Output low voltage ISINK = 2 mA 15 30 mV

PGDIOH Off leakage current VPGD = 17V 1µA

Product Folder Links: LM25061

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

Typical Performance Characteristics

Unless otherwise specified the following conditions apply: TJ= 25°C, VIN = 12V

VIN Pin Input Current

vs.

VIN SENSE Pin Input Current

Figure 3. Figure 4.

OUT Pin Input Current GATE Pin Voltage

Figure 5. Figure 6.

GATE Pin Source Current MOSFET Power Dissipation Limit

Figure 7. Figure 8.

Product Folder Links: LM25061

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

Typical Performance Characteristics (continued)

Unless otherwise specified the following conditions apply: TJ= 25°C, VIN = 12V

PGD Pin Low Voltage Input Current, Enabled

vs. vs.

Sink Current Temperature

Figure 9. Figure 10.

UVLO Threshold UVLO Hysteresis Current

vs. vs.

Temperature Temperature

Figure 11. Figure 12.

FB Threshold FB Hysteresis Current

vs. vs.

Temperature Temperature

Figure 13. Figure 14.

Product Folder Links: LM25061

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

Typical Performance Characteristics (continued)

Unless otherwise specified the following conditions apply: TJ= 25°C, VIN = 12V

Current Limit Threshold Circuit Breaker Threshold

vs. vs.

Temperature Temperature

Figure 15. Figure 16.

Power Limit Threshold GATE Output Voltage

vs. vs.

Temperature Temperature

Figure 17. Figure 18.

GATE Source Current PGD Low Voltage

vs. vs.

Temperature Temperature

Figure 19. Figure 20.

Product Folder Links: LM25061

Power

Good

UVLO/EN

PWRGNDTIMER

PGD

OUT

VIN SENSE GATE

LM25061

VOUT

VSYS

FB VPGD

CIN

RPG

RPWR

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

Block Diagram

Figure 21. Basic Application Circuit

Product Folder Links: LM25061

LOAD

VIN

GND

LIVE POWER

SOURCE

PLUG - IN BOARD

VSYS

PGD

OUT

RSQ1

VOUT

LM25061

+12V

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

Functional Description

The LM25061 is designed to control the in-rush current to the load upon insertion of a circuit card into a live

backplane or other "hot" power source, thereby limiting the voltage sag on the backplane’s supply voltage, and

the dV/dt of the voltage applied to the load. Effects on other circuits in the system are minimized, preventing

possible unintended resets. A controlled shutdown when the circuit card is removed can also be implemented

using the LM25061. In addition to a programmable current limit, the LM25061 monitors and limits the maximum

power dissipation in the series pass device to maintain operation within the device Safe Operating Area (SOA).

Either current limiting or power limiting for an extended period of time results in the shutdown of the series pass

device. In this event, the LM25061-1 latches off until the circuit is re-enabled by external control, while the

LM25061-2 automatically restarts with defined timing. The circuit breaker function quickly switches off the series

pass device upon detection of a severe over-current condition. The Power Good (PGD) output pin indicates

when the output voltage is above the programmed threshold. A programmable under-voltage lock-out (UVLO)

circuit enables the LM25061 when the system input voltage is above the desired threshold. The typical

configuration of a circuit card with LM25061 hot swap protection is shown in Figure 22.

Figure 22. LM25061 Application

Power Up Sequence

The VIN operating range of the LM25061 is +2.9V to +17V, with a transient capability to 20V. Referring to the

Block Diagram and Figure 21 and Figure 23, as the voltage at VIN initially increases, the external N-channel

MOSFET (Q1) is held off by an internal 260 mA pull-down current at the GATE pin. The strong pull-down current

at the GATE pin prevents an inadvertent turn-on as the MOSFET’s gate-to-drain (Miller) capacitance is charged.

Additionally, the TIMER pin is initially held at ground. When the VIN voltage reaches the POR threshold the

insertion time begins. During the insertion time, the capacitor at the TIMER pin (CT) is charged by a 5.5 µA

current source, and Q1 is held off by a 2 mA pull-down current at the GATE pin regardless of the VIN voltage.

The insertion time delay allows ringing and transients at VIN to settle before Q1 is enabled. The insertion time

ends when the TIMER pin voltage reaches 1.72V. CTis then quickly discharged by an internal 2 mA pull-down

current. The GATE pin then switches on Q1 when VSYS exceeds the UVLO threshold. If VSYS is above the UVLO

threshold at the end of the insertion time, Q1 switches on at that time. The GATE pin charge pump sources 20

µA to charge Q1’s gate capacitance. The maximum voltage at the GATE pin is limited by an internal 19.5V zener

diode.

As the voltage at the OUT pin increases, the LM25061 monitors the drain current and power dissipation of

MOSFET Q1. In-rush current limiting and/or power limiting circuits actively control the current delivered to the

load. During the in-rush limiting interval (t2 in Figure 23) an internal 80 µA fault timer current source charges CT.

If Q1’s power dissipation and the input current reduce below their respective limiting thresholds before the

TIMER pin reaches 1.72V the 80 µA current source is switched off, and CTis discharged by the internal 2.5 µA

current sink (t3 in Figure 23). The in-rush limiting interval is complete when the load current reduces to the

normal operating level. The PGD pin switches high when the output voltage exceeds the threshold programmed

at the FB pin.

If the TIMER pin voltage reaches 1.72V before in-rush current limiting or power limiting ceases (during t2), a fault

is declared and Q1 is turned off. See the Fault Timer & Restart section for a complete description of the fault

mode.

Product Folder Links: LM25061

TIMER

Load

Current

Output

Voltage

(OUT Pin)

PGD

UVLO

Normal Operation

GATE

Insertion Time

POR

VSYS

VIN

ILIMIT

20 PA source

2.5 PA

80PA

t2t1 In-rush

Limiting

5.5 PA1.72V

2 mA

2 mA pull-down

260 mA

pull-down

FB Threshold

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

Figure 23. Power Up Sequence (Current Limit only)

Gate Control

A charge pump provides the voltage at the GATE pin to enhance the N-Channel MOSFET’s gate. During normal

operating conditions (t3 in Figure 23) the gate of Q1 is held charged by an internal 20 µA current source. The

voltage at the GATE pin (with respect to ground) is limited by an internal 19.5V zener diode. See the graph “

GATE Pin Voltage”. Since the gate-to-source voltage applied to Q1 could be as high as 19.5V during various

conditions, a zener diode with the appropriate voltage rating must be added between the GATE and OUT pins if

the maximum VGS rating of the selected MOSFET is less than 19.5V. The external zener diode must have a

forward current rating of at least 260 mA.

When the system voltage is initially applied, the GATE pin is held low by a 260 mA pull-down current. This helps

prevent an inadvertent turn-on of the MOSFET through its drain-gate capacitance as the applied system voltage

increases.

During the insertion time (t1 in Figure 23) the GATE pin is held low by a 2 mA pull-down current. This maintains

Q1 in the off-state until the end of t1, regardless of the voltage at VIN or UVLO.

Following the insertion time, during t2 in Figure 23, the gate voltage of Q1 is modulated to keep the current or

power dissipation level from exceeding the programmed levels. While in the current or power limiting mode the

TIMER pin capacitor is charging. If the current and power limiting cease before the TIMER pin reaches 1.72V the

TIMER pin capacitor then discharges, and the circuit enters normal operation.

If the in-rush limiting condition persists such that the TIMER pin reached 1.72V during t2, the GATE pin is then

pulled low by the 2 mA pull-down current. The GATE pin is then held low until either a power up sequence is

initiated (LM25061-1), or until the end of the restart sequence (LM25061-2). See the Fault Timer & Restart

section.

If the system input voltage falls below the UVLO threshold, the GATE pin is pulled low by the 2 mA pull-down

current to switch off Q1.

Product Folder Links: LM25061

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

Current Limit

The current limit threshold is reached when the voltage across the sense resistor RS(VIN to SENSE) reaches 50

mV. In the current limiting condition, the GATE voltage is controlled to limit the current in MOSFET Q1. While the

current limit circuit is active, the fault timer is active as described in the Fault Timer & Restart section. If the load

current falls below the current limit threshold before the end of the Fault Timeout Period, the LM25061 resumes

normal operation. For proper operation, the RSresistor value should be no larger than 200 mΩ. Higher values

may result in instability in the current limit control loop.

Circuit Breaker

If the load current increases rapidly (e.g., the load is short-circuited) the current in the sense resistor (RS) may

exceed the current limit threshold before the current limit control loop is able to respond. If the current exceeds

approximately twice the current limit threshold (95 mV/RS), Q1 is quickly switched off by the 260 mA pull-down

current at the GATE pin, and a Fault Timeout Period begins. When the voltage across RSfalls below 95 mV the

260 mA pull-down current at the GATE pin is switched off, and the gate voltage of Q1 is then determined by the

current limit or the power limit functions. If the TIMER pin reaches 1.72V before the current limiting or power

limiting condition ceases, Q1 is switched off by the 2 mA pull-down current at the GATE pin as described in the

Fault Timer & Restart section.

Power Limit

An important feature of the LM25061 is the MOSFET power limiting. The Power Limit function can be used to

maintain the maximum power dissipation of MOSFET Q1 within the device SOA rating. The LM25061 determines

the power dissipation in Q1 by monitoring its drain-source voltage (SENSE to OUT), and the drain current

through the sense resistor (VIN to SENSE). The product of the current and voltage is compared to the power

limit threshold programmed by the resistor at the PWR pin. If the power dissipation reaches the limiting threshold,

the GATE voltage is modulated to regulate the current in Q1. While the power limiting circuit is active, the fault

timer is active as described in the Fault Timer & Restart section.

Fault Timer & Restart

When the current limit or power limit threshold is reached during turn-on or as a result of a fault condition, the

gate-to-source voltage of Q1 is modulated to regulate the load current and power dissipation in Q1. When either

limiting function is activated, an 80 µA fault timer current source charges the external capacitor (CT) at the

TIMER pin as shown in Figure 25 (Fault Timeout Period). If the fault condition subsides during the Fault Timeout

Period before the TIMER pin reaches 1.72V, the LM25061 returns to the normal operating mode and CTis

discharged by the 2.5 µA current sink. If the TIMER pin reaches 1.72V during the Fault Timeout Period, Q1 is

switched off by a 2 mA pull-down current at the GATE pin. The subsequent restart procedure then depends on

which version of the LM25061 is in use.

The LM25061-1 latches the GATE pin low at the end of the Fault Timeout Period. CTis then discharged to

ground by the 2.5 µA fault current sink. The GATE pin is held low by the 2 mA pull-down current until a power up

sequence is externally initiated by cycling the input voltage (VSYS), or momentarily pulling the UVLO pin below its

threshold with an open-collector or open-drain device as shown in Figure 24. The voltage at the TIMER pin must

be less than 0.3V for the restart procedure to be effective.

Figure 24. Latched Fault Restart Control

Product Folder Links: LM25061

ILIMIT

Load

Current

GATE

TIMER

1.72V

1V 1 2 3 7 8

2 mA

pulldown 20 PA

Gate Charge

80 PA

tRESTART

Fault Timeout

Period

0.3V

Fault

Detection

2.5 PA

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

The LM25061-2 provides an automatic restart sequence which consists of the TIMER pin cycling between 1.72V

and 1V seven times after the Fault Timeout Period, as shown in Figure 25. The period of each cycle is

determined by the 80 µA charging current, and the 2.5 µA discharge current, and the value of the capacitor CT.

When the TIMER pin reaches 0.3V during the eighth high-to-low ramp, the 20 µA current source at the GATE pin

turns on Q1. If the fault condition is still present, the Fault Timeout Period and the restart cycle repeat.

The Fault Timeout Period during restart cycles is approximately 18% shorter than the initial fault timeout period

which initiated the restart cycle. This is due to the fact that the TIMER pin transitions from 0.3V to 1.72V after

each restart time, rather than from ground.

Figure 25. Restart Sequence (LM25061-2)

Under-Voltage Lock-Out (UVLO)

The series pass MOSFET (Q1) is enabled when the input supply voltage (VSYS) is greater than the

programmable under-voltage lockout (UVLO) level. Typically the UVLO level at VSYS is set with a resistor divider

(R1-R2) as shown in Figure 21. Refering to the Block Diagram when VSYS is below the UVLO level, the internal

20 µA current source at UVLO is enabled, and Q1 is held off by the 2 mA pull-down current at the GATE pin. As

VSYS is increased, raising the voltage at UVLO above its threshold the 20 µA current source at UVLO is switched

off, increasing the voltage at UVLO, providing hysteresis for this threshold. With the UVLO pin above its

threshold, Q1 is switched on by the 20 µA current source at the GATE pin if the insertion time delay has expired.

See the Applications Section for a procedure to calculate the values of the threshold setting resistors (R1-R2).

The minimum possible UVLO level at VSYS can be set by connecting the UVLO pin to VIN. In this case Q1 is

enabled after the insertion time.

Shutdown Control

The load current can be remotely switched off by taking the UVLO pin below its threshold with an open collector

or open drain device, as shown in Figure 26. Upon releasing the UVLO pin the LM25061 switches on the load

current with in-rush current and power limiting.

Figure 26. Shutdown Control

Product Folder Links: LM25061

SENSE

RESISTOR

FROM

SYSTEM

INPUT

VOLTAGE

TO MOSFET'S

DRAIN

HIGH CURRENT PATH

VIN

SENSE 9

LM25061

RS = 50 mV

ILIM

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

Power Good Pin

The Power Good indicator pin (PGD) is connected to the drain of an internal N-channel MOSFET capable of

sustaining 17V in the off-state, and transients up to 20V. An external pull-up resistor is required at PGD to an

appropriate voltage to indicate the status to downstream circuitry. The off-state voltage at the PGD pin can be

higher or lower than the voltages at VIN and OUT. The PGD pin switches high when the voltage at the FB pin

exceeds its threshold. Typically the output voltage threshold is set with a resistor divider (R3-R4) as shown in

Figure 21, although the monitored voltage need not be the output voltage. Any other voltage can be monitored by

connecting R3 to that voltage as long as the voltage at the FB pin does not exceed its maximum rating. Referring

to the Block Diagram, when the voltage at the FB pin is below its threshold, the internal 22 µA current source at

FB is disabled. As the output voltage increases, taking FB above its threshold, the current source is enabled,

sourcing current out of the pin, raising the voltage at FB to provide threshold hysteresis.

The PGD output is low when the UVLO pin is below its threshold. The PGD output is high when the voltage at

VIN is less than 1.6V.

APPLICATION INFORMATION

(Refer to Figure 21)

CURRENT LIMIT, RS

The LM25061 monitors the current in the external MOSFET (Q1) by measuring the voltage across the sense

resistor (RS), connected from VIN to SENSE. The required resistor value is calculated from:

where

• ILIM is the desired current limit threshold (1)

If the voltage across RSreaches 50 mV, the current limit circuit modulates the gate of Q1 to regulate the current

at ILIM. While the current limiting circuit is active, the fault timer is active as described in the Fault Timer & Restart

section. For proper operation, RSmust be no larger than 200 mΩ.

While the maximum load current in normal operation can be used to determine the required power rating for

resistor RS, basing it on the current limit value provides a more reliable design since the circuit can operate near

the current limit threshold continuously. The resistor’s surge capability must also be considered since the circuit

breaker threshold is approximately twice the current limit threshold. Connections from RSto the LM25061 should

be made using Kelvin techniques. In the suggested layout of Figure 27 the small pads at the lower corners of the

sense resistor connect only to the sense resistor terminals, and not to the traces carrying the high current. With

this technique, only the voltage across the sense resistor is applied to VIN and SENSE, eliminating the voltage

drop across the high current solder connections.

Figure 27. Sense Resistor Connections

Product Folder Links: LM25061

tON = VSYS x CL

ILIM

VSENSE = IL x RS = RPWR

2.32 x 105 x VDS

RS x PFET(LIM)

VDS

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

POWER LIMIT THRESHOLD

The LM25061 determines the power dissipation in the external MOSFET (Q1) by monitoring the drain current

(the current in RS), and the VDS of Q1 (SENSE to OUT pins). The resistor at the PWR pin (RPWR) sets the

maximum power dissipation for Q1, and is calculated from the following equation:

RPWR = 2.32 x 105x RSx PFET(LIM)

where

• PFET(LIM) is the desired power limit threshold for Q1

• RSis the current sense resistor described in the Current Limit section (2)

For example, if RSis 10 mΩ, and the desired power limit threshold is 20W, RPWR calculates to 46.4 kΩ. If Q1’s

power dissipation reaches the threshold Q1’s gate is modulated to regulate the load current, keeping Q1’s power

from exceeding the threshold. For proper operation of the power limiting feature, RPWR must be ≤150 kΩ. While

the power limiting circuit is active, the fault timer is active as described in the Fault Timer & Restart section.

Typically, power limit is reached during startup, or if the output voltage falls due to a severe overload or short

circuit.

The programmed maximum power dissipation should have a reasonable margin from the maximum power

defined by the FET's SOA chart if the LM25061-2 is used since the FET will be repeatedly stressed during fault

restart cycles. The FET manufacturer should be consulted for guidelines.

If the application does not require use of the power limit function the PWR pin can be left open.

The accuracy of the power limit function at turn-on may degrade if a very low value power dissipation limit is set.

The reason for this caution is that the voltage across the sense resistor, which is monitored and regulated by the

power limit circuit, is lowest at turn-on when the regulated current is at minimum. The voltage across the sense

resistor during power limit can be expressed as follows:

where

• IL is the current in RS

• VDS is the voltage across Q1 (3)

For example, if the power limit is set at 20W with RS= 10 mohms, and VDS = 15V the sense resistor voltage

calculates to 13.3 mV, which is comfortably regulated by the LM25061. However, if a lower power limit is set

lower (e.g., 2W), the sense resistor voltage calculates to 1.33 mV. At this low level noise and offsets within the

LM25061 may degrade the power limit accuracy. To maintain accuracy, the sense resistor voltage should not be

less than 5 mV.

TURN-ON TIME

The output turn-on time depends on whether the LM25061 operates in current limit, or in both power limit and

current limit, during turn-on.

A) Turn-on with current limit only: The current limit threshold (ILIM) is determined by the current sense resistor

(RS). If the current limit threshold is less than the current defined by the power limit threshold at maximum VDS

the circuit operates at the current limit threshold only during turn-on. Referring to Figure 30a, as the load current

reaches ILIM, the gate-to-source voltage is controlled at VGSL to maintain the current at ILIM. As the output voltage

reaches its final value, (VDS ≊0V) the drain current reduces to its normal operating value. The time for the OUT

pin voltage to transition from zero volts to VSYS is equal to:

where

• CLis the load capacitance (4)

Product Folder Links: LM25061

tON = CL x VSYS2

2 x PFET(LIM)

CL x PFET(LIM)

2 x ILIM2

VIN

GND

PGD

OUT

GND

LM25061

VSYS

CLRL

VIN

GND

PGD

OUT

GND

VSYS

CLRL

LM25061

tON = -(RL x CL) x In (ILIM x RL) - VSYS

(ILIM x RL)

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

For example, if VSYS = 12V, CL= 1000 µF, and ILIM = 1A, tON calculates to 12 ms. The maximum instantaneous

power dissipated in the MOSFET is 12W. This calculation assumes the time from t1 to t2 in Figure 30a is small

compared to tON, and the load does not draw any current until after the output voltage has reached its final value,

(Figure 28). If the load draws current during the turn-on sequence (Figure 29), the turn-on time is longer than the

above calculation, and is approximately equal to:

where

• RLis the load resistance (5)

The Fault Timeout Period must be set longer than tON to prevent a fault shutdown before the turn-on sequence is

complete.

Figure 28. No Load Current During Turn-On

Figure 29. Load Draws Current During Turn-On

B) Turn-on with power limit and current limit: The maximum allowed power dissipation in Q1 (PFET(LIM)) is

defined by the resistor at the PWR pin, and the current sense resistor RS. See the Power Limit Threshold

section. If the current limit threshold (ILIM) is higher than the current defined by the power limit threshold at

maximum VDS (PFET(LIM)/VSYS) the circuit operates initially in the power limit mode when the VDS of Q1 is high,

and then transitions to current limit mode as the current increases to ILIM and VDS decreases. See Figure 30b.

Assuming the load (RL) is not connected during turn-on, the time for the output voltage to reach its final value is

approximately equal to:

(6)

For example, if VSYS = 12V, CL= 1000 µF, ILIM = 1A, and PFET(LIM) = 10W, tON calculates to ≊12.2 ms, and the

initial current level (IP) is approximately 0.83A. The Fault Timeout Period must be set longer than tON.

Product Folder Links: LM25061

Drain Current

00t2 t3

a) Current Limit Only

VSYS VDS

ILIM

VGATE

VGSL

VTH tON

Source Voltage-toGate-

b) Power Limit and Current Limit

VDS

Drain Current

tON

VSYS

ILIM

VGATE

VGSL

VTH

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

Figure 30. MOSFET Power Up Waveforms

MOSFET SELECTION

It is recommended that the external MOSFET (Q1) selection be based on the following criteria:

• The BVDSS rating should be greater than the maximum system voltage (VSYS), plus ringing and transients

which can occur at VSYS when the circuit card, or adjacent cards, are inserted or removed.

• The maximum continuous current rating should be based on the current limit threshold (50 mV/RS), not the

maximum load current, since the circuit can operate near the current limit threshold continuously.

• The Pulsed Drain Current spec (IDM) must be greater than the current threshold for the circuit breaker function

(95 mV/RS).

• The SOA (Safe Operating Area) chart of the device, and the thermal properties, should be used to determine

the maximum power dissipation threshold set by the RPWR resistor. The programmed maximum power

dissipation should have a reasonable margin from the maximum power defined by the FET's SOA chart if the

LM25061-2 is used since the FET will be repeatedly stressed during fault restart cycles. The FET

manufacturer should be consulted for guidelines.

• RDS(on) should be sufficiently low that the power dissipation at maximum load current (IL(max)2x RDS(on)) does

not raise its junction temperature above the manufacturer’s recommendation.

If the circuit’s input voltage is at the low end of the LM25061’s operating range (<3.5V), or at the high end of the

operating range (>14V), the gate-to-source voltage applied to the MOSFET by the LM25061 is less than 5V, and

can approach 1V in a worst case situation. See the graph “ GATE Pin Voltage”. The selected device must have a

suitable Gate-to-Source Threshold Voltage.

The gate-to-source voltage provided by the LM25061 can be as high as 19.5V at turn-on when the output voltage

is zero. At turn-off the reverse gate-to-source voltage will be equal to the output voltage at the instant the GATE

pin is pulled low. If the device chosen for Q1 is not rated for these voltages, an external zener diode must be

added from its gate to source, with the zener voltage less than the device maximum VGS rating. The zener

diode’s working voltage protects the MOSFET during turn-on, and its forward voltage protects the MOSFET

during shutoff. The zener diode’s forward current rating must be at least 260 mA to conduct the GATE pull-down

current when a circuit breaker condition is detected.

TIMER CAPACITOR, CT

The TIMER pin capacitor (CT) sets the timing for the insertion time delay, fault timeout period, and restart timing

of the LM25061-2.

A) Insertion Delay - Upon applying the system voltage (VSYS) to the circuit, the external MOSFET (Q1) is held

off during the insertion time (t1 in Figure 23) to allow ringing and transients at VSYS to settle. Since each

backplane’s response to a circuit card plug-in is unique, the worst case settling time must be determined for each

application. The insertion time starts when VIN reaches the POR threshold, at which time the internal 5.5 µA

current source charges CTfrom 0V to 1.72V. The required capacitor value is calculated from:

Product Folder Links: LM25061

tRESTART = CT x 7 x 0.72V

2.5 PA7 x 0.72V

80 PA1.42V

2.5 PA

CT = tFAULT x 80 PA

1.42V = tFAULT x 5.63 x 10-5

CT = tFAULT x 80 PA

1.72V = tFAULT x 4.65 x 10-5

CT = t1 x 5.5 PA

1.72V = t1 x 3.2 x 10-6

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

(7)

For example, if the desired insertion delay is 250 ms, CTcalculates to 0.8 µF. At the end of the insertion delay,

CTis quickly discharged by a 2 mA current sink.

B) Fault Timeout Period - During in-rush current limiting or upon detection of a fault condition where the current

limit and/or power limit circuits regulate the current through Q1, the fault timer current source (80 µA) switches on

to charge CT. The Fault Timeout Period is the time required for the voltage at the TIMER pin to transition from

ground to 1.72V, at which time Q1 is switched off. If the LM25061-1 is in use, the required capacitor value is

calculated from:

(8)

For example, if the desired Fault Timeout Period is 17 ms, CTcalculates to 0.8 µF. When the Fault Timeout

Period expires, the LM25061-1 latches the GATE pin low until a power-up sequence is initiated by external

circuitry. If the LM25061-2 is in use, the Fault Timeout Period during restart cycles is approximately 18% shorter

than the initial fault timeout period which initiated the restart cycles since the voltage at the TIMER pin transitions

from 0.3V to 1.72V. Since the Fault Timeout Period must always be longer than the turn-on-time, the required

capacitor value for the LM25061-2 is calculated using this shorter time period:

(9)

For example, if the desired Fault Timeout Period is 17 ms, CTcalculates to 0.96 µF. When the Fault Timeout

Period of the LM25061-2 expires, a restart sequence starts as described below (Restart Timiing). Since the

LM25061 normally operates in power limit and/or current limit during a power-up sequence, the Fault Timeout

Period MUST be longer than the time required for the output voltage to reach its final value. See the Turn-on

Time section

C) Restart Timing For the LM25061-2, after the Fault Timeout Period described above, CTis discharged by the

2.5 µA current sink to 1.0V. The TIMER pin then cycles through seven additional charge/discharge cycles

between 1V and 1.72V as shown in Figure 25. The restart time ends when the TIMER pin voltage reaches 0.3V

during the final high-to-low ramp. The restart time, after the Fault Timeout Period, is equal to:

= CTx 2.65 x 106(10)

For example, if CT= 0.8 µF, tRESTART = 2.12 seconds. At the end of the restart time, Q1 is switched on. If the fault

is still present, the fault timeout and restart sequence repeats. The on-time duty cycle of Q1 is approximately

0.67% in this mode.

UVLO

Programming the UVLO thresholds sets the minimum system voltage to enable the series pass device (Q1). If

VSYS is below the UVLO thresholds, Q1 is switched off, denying power to the load. Programmable hysteresis is

provided.

Option A: The UVLO thresholds are set with two resistors (R1, R2) as shown in Figure 31.

Product Folder Links: LM25061

VIN

UVLO/

GND

TIMER AND GATE

LOGIC CONTROL

LM25061

VPWR

20 PA

1.17V

VUVL = 1.17V x (R1 + R2)

VUVH = 1.17V + [R1 x R2

(1.17V + 20 PA)]

R2 = 1.17V x R1

VUVL - 1.17V

R1 = VUVH - VUVL

20 PA=VUV(HYS)

20 PA

VIN

UVLO/

GND

TIMER AND GATE

LOGIC CONTROL

LM25061

VPWR

20 PA

1.17V

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

Figure 31. Programming the UVLO Thresholds

The two resistor values are calculated as follows:

• Choose the upper and lower UVLO thresholds (VUVH) and (VUVL).

(11)

(12)

As an example, assume the application requires the following thresholds: VUVH = 8V, VUVL = 7V.Therefore

VUV(HYS) = 1V. The resistor values are:

R1 = 50 kΩ, R2 = 10 kΩ(13)

Where the resistor values are known, the threshold voltages and hysteresis are calculated from the following:

(14)

(15)

VUV(HYS) = R1 x 20 µA (16)

Option B: The minimum UVLO level is obtained by connecting the UVLO pin to VIN as shown in Figure 32. Q1

is switched on when the VIN voltage reaches the POR threshold (≊2.6V).

Figure 32. UVLO = POR

Product Folder Links: LM25061

GND

PGD

RPG

LM25061

VPGD

Power

Good

VPGDL = 1.17V + [R3 x R4

(1.17V - 22 PA)]

VPGDH =1.17V x (R3 + R4)

R4 = (VPGDH - 1.17V)

1.17V x R3

R3 = VPGDH - VPGDL

22 PA=VPGD(HYS)

22 PA

OUT

GND

1.17V

22 PA

LM25061

PGD

SENSE

VOUT

from UVLO

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

POWER GOOD and FB PINS

During turn-on, the Power Good pin (PGD) is high until the voltage at VIN increases above ≊1.6V. PGD then

switches low, remaining low as the VIN voltage increases. When the voltage at the FB pin increases above its

threshold PGD switches high. PGD switches low when the voltage at the FB pin is below the programmed

threshold, or if the UVLO pin is taken below its threshold. Setting the output threshold for the PGD pin requires

two resistors (R3, R4) as shown in Figure 33. While monitoring the output voltage is shown in Figure 33 , R3 can

be connected to any other voltage which requires monitoring.

Figure 33. Programming the PGD Threshold

The resistor values are calculated as follows:

• Choose the upper and lower threshold (VPGDH) and (VPGDL) at VOUT.

(17)

(18)

As an example, assume the application requires the following thresholds: VPGDH = 11V, and VPGDL = 10.5V.

Therefore VPGD(HYS) = 0.5V. The resistor values are:

R3 = 22.7 kΩ, R4 = 2.68 kΩ(19)

Where the R3 and R4 resistor values are known, the threshold voltages and hysteresis are calculated from the

following:

(20)

(21)

VPGD(HYS) = R3 x 22 µA (22)

A pull-up resistor is required at PGD as shown in Figure 34. The pull-up voltage (VPGD) can be as high as 17V,

and can be higher or lower than the voltages at VIN and OUT.

Figure 34. Power Good Output

Product Folder Links: LM25061

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

If a delay is required at PGD, suggested circuits are shown in Figure 35.InFigure 35a, capacitor CPG adds delay

to the rising edge, but not to the falling edge. In Figure 35b, the rising edge is delayed by RPG1 + RPG2 and CPG,

while the falling edge is delayed a lesser amount by RPG2 and CPG. Adding a diode across RPG2 (Figure 35c)

allows for equal delays at the two edges, or a short delay at the rising edge and a long delay at the falling edge.

Design-in Procedure

The recommended design-in procedure is as follows:

• Determine the current limit threshold (ILIM). This threshold must be higher than the normal maximum load

current, allowing for tolerances in the current sense resistor value and the LM25061 Current Limit threshold

voltage. Use Equation 1 to determine the value for RS.

• Determine the maximum allowable power dissipation for the series pass FET (Q1), using the device’s SOA

information. Use Equation 2 to determine the value for RPWR.

• Determine the value for the timing capacitor at the TIMER pin (CT) using Equation 8 or Equation 9. The fault

timeout period (tFAULT) must be longer than the circuit’s turn-on-time. The turn-on time can be estimated using

the equations in the TURN-ON TIME section of this data sheet, but should be verified experimentally. Review

the resulting insertion time, and restart timing if the LM25061-2 is used.

• Choose option A or B from the UVLO section of the Application Information for setting the UVLO threshold

and hysteresis. Use the procedure for the appropriate option to determine the resistor values at the UVLO

pin.

• Choose the appropriate voltage, and pull-up resistor, for the Power Good output.

• Determine the resistor values for the FB pin.

PC Board Guidelines

The following guidelines should be followed when designing the PC board for the LM25061:

• Place the LM25061 close to the board’s input connector to minimize trace inductance from the connector to

the FET.

• Place a small capacitor (1000 pF) directly adjacent to the VIN and GND pins of the LM25061 to help minimize

transients which may occur on the input supply line. Transients of several volts can easily occur when the

load current is shut off.

• The sense resistor (RS) should be close to the LM25061, and connected to it using the Kelvin techniques

shown in Figure 27.

• The high current path from the board’s input to the load (via Q1), and the return path, should be parallel and

close to each other to minimize loop inductance.

• The ground connection for the various components around the LM25061 should be connected directly to

each other, and to the LM25061’s GND pin, and then connected to the system ground at one point. Do not

connect the various component grounds to each other through the high current ground line.

• Provide adequate heat sinking for the series pass device (Q1) to help reduce stresses during turn-on and

turn-off.

• The board’s edge connector can be designed to shut off the LM25061 as the board is removed, before the

supply voltage is disconnected from the LM25061. In Figure 36 the voltage at the UVLO pin goes to ground

before VSYS is removed from the LM25061 due to the shorter edge connector pin. When the board is inserted

into the edge connector, the system voltage is applied to the LM25061’s VIN pin before the UVLO voltage is

taken high.

Product Folder Links: LM25061

GND

VSYS

LM25061

PLUG-IN CARD

CARD EDGE

CONNECTOR

Load

CIN

To System

Ground

SENSE

VIN

UVLO

GND

GATE

OUT

PGD

PWR

TIMER

R4 R3

a) Delay Rising Edge Only b) Long delay at rising edge,

short delay at falling edge c) Short Delay at Rising Edge and

Long Delay at Falling Edge or

Equal Delays

GND

PGD

RPG1

VPGD

Power

Good

CPG

GND

PGD

RPG1

VPGD

Power

Good

CPG

GND

PGD

RPG1

VPGD

Power

Good

CPG

RPG2

LM25061

LM25061 LM25061

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

Figure 35. Adding Delay to the Power Good Output Pin

Figure 36. Recommended Board Connector Design

System Considerations

1. Continued proper operation of the LM25061 hot swap circuit requires capacitance be present on the supply

side of the connector into which the hot swap circuit is plugged in, as depicted in Figure 22. The capacitor in

the “Live Power Source” section is necessary to absorb the transient generated whenever the hot swap

circuit shuts off the load current. If the capacitance is not present, inductance in the supply lines will generate

a voltage transient at shut-off which can exceed the absolute maximum rating of the LM25061, resulting in its

destruction.

2. If the load powered by the LM25061 hot swap circuit has inductive characteristics, a Schottky diode is

required across the LM25061’s output, along with some load capacitance. The capacitance and the diode

are necessary to limit the negative excursion at the OUT pin when the load current is shut off. If the OUT pin

transitions more than 0.3V negative the LM25061 will internally reset, interfering with the latch-off feature of

the LM25061-1, or the restart cycle of the LM25061-2. See Figure 37.

Product Folder Links: LM25061

VIN

GND

LIVE

POWER SOURCE OUT

PLUG-IN BOARD

VSYS VOUT

+12V

CLInductive

Load

LM25061

SENSE

LM25061

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

www.ti.com

Figure 37. Output Diode Required for Inductive Loads

Product Folder Links: LM25061

LM25061

www.ti.com

SNVS611E –FEBRUARY 2011–REVISED MARCH 2013

REVISION HISTORY

Changes from Revision D (March 2013) to Revision E Page

• Changed layout of National Data Sheet to TI format .......................................................................................................... 22

Product Folder Links: LM25061

PACKAGE OPTION ADDENDUM

www.ti.com 11-Apr-2013

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead/Ball Finish MSL Peak Temp

(3)

Op Temp (°C) Top-Side Markings

(4)

Samples

LM25061PMM-1/NOPB ACTIVE VSSOP DGS 10 1000 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 SXSB

LM25061PMM-2/NOPB ACTIVE VSSOP DGS 10 1000 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 SXRB

LM25061PMME-1/NOPB ACTIVE VSSOP DGS 10 250 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 SXSB

LM25061PMME-2/NOPB ACTIVE VSSOP DGS 10 250 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 SXRB

LM25061PMMX-1/NOPB ACTIVE VSSOP DGS 10 3500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 SXSB

LM25061PMMX-2/NOPB ACTIVE VSSOP DGS 10 3500 Green (RoHS

& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 SXRB

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability

information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that

lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between

the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight

in homogeneous material)

(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a

continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.

PACKAGE OPTION ADDENDUM

www.ti.com 11-Apr-2013

Addendum-Page 2

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

LM25061PMM-1/NOPB VSSOP DGS 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

LM25061PMM-2/NOPB VSSOP DGS 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

LM25061PMME-1/NOPB VSSOP DGS 10 250 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

LM25061PMME-2/NOPB VSSOP DGS 10 250 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

LM25061PMMX-1/NOPB VSSOP DGS 10 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

LM25061PMMX-2/NOPB VSSOP DGS 10 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1

PACKAGE MATERIALS INFORMATION

www.ti.com 8-Apr-2013

Pack Materials-Page 1

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

LM25061PMM-1/NOPB VSSOP DGS 10 1000 210.0 185.0 35.0

LM25061PMM-2/NOPB VSSOP DGS 10 1000 210.0 185.0 35.0

LM25061PMME-1/NOPB VSSOP DGS 10 250 210.0 185.0 35.0

LM25061PMME-2/NOPB VSSOP DGS 10 250 210.0 185.0 35.0

LM25061PMMX-1/NOPB VSSOP DGS 10 3500 367.0 367.0 35.0

LM25061PMMX-2/NOPB VSSOP DGS 10 3500 367.0 367.0 35.0

PACKAGE MATERIALS INFORMATION

www.ti.com 8-Apr-2013

Pack Materials-Page 2

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other

changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest

issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and

complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale

supplied at the time of order acknowledgment.

TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms

and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary

to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily

performed.

TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and

applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide

adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or

other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information

published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or

endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the

third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration

and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered

documentation. Information of third parties may be subject to additional restrictions.

Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service

voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.

TI is not responsible or liable for any such statements.

Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements

concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support

that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which

anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause

harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use

of any TI components in safety-critical applications.

In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to

help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and

requirements. Nonetheless, such components are subject to these terms.

No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties

have executed a special agreement specifically governing such use.

Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in

military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components

which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and

regulatory requirements in connection with such use.

TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of

non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.

Products Applications

Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive

Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications

Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers

DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps

DSP dsp.ti.com Energy and Lighting www.ti.com/energy

Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial

Interface interface.ti.com Medical www.ti.com/medical

Logic logic.ti.com Security www.ti.com/security

Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense

Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video

RFID www.ti-rfid.com

OMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.com

Wireless Connectivity www.ti.com/wirelessconnectivity

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Texas Instruments:

LM25061PMM-1/NOPB LM25061PMM-2/NOPB LM25061PMME-1/NOPB LM25061PMME-2/NOPB

LM25061PMMX-1/NOPB LM25061PMMX-2/NOPB