LTC2913HDD-1#PBF - LINEAR TECHNOLOGY

LTC2913

2913fb

FEATURES

APPLICATIONS

DESCRIPTION

Dual UV/OV

Voltage Monitor

The LTC

2913 is a dual input voltage monitor intended for

multiple voltages in a variety of applications. Dual inputs for

each voltage allow monitoring two separate undervoltage

(UV) conditions and two separate overvoltage (OV)

conditions. All monitors share a common undervoltage

output and a common overvoltage output. The LTC2913-1

has latching capability for the overvoltage output. The

LTC2913- 2 has functionality to disable both the overvoltage

and undervoltage outputs.

Glitch ﬁ ltering ensures reliable reset operation without

false or noisy triggering.

The LTC2913 provides a precise, versatile, space-con-

scious, micropower solution for voltage monitoring.

n Monitors Two Voltages Simultaneously

n Adjustable UV and OV Trip Values

n Guaranteed Threshold Accuracy: ±1.5%

n Input Glitch Rejection

n Adjustable Reset Timeout with Disable

n 44μA Quiescent Current

n Open-Drain OV and UV Outputs

n Guaranteed OV and UV for VCC ≥ 1V

n Available in 10-Lead MSOP and (3mm × 3mm)

DFN Packages

n Desktop and Notebook Computers

n Network Servers

n Core, I/O Voltage Monitors

Dual OV/UV Supply Monitor Typical Transient Duration

vs Comparator Overdrive

TYPICAL APPLICATION

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

27.4k1k

44.2k

VH1

LTC2913-1

VL1

VH2

GND TMR

SYSTEM

POWER

SUPPLIES

VL2

2913 TA01a

LATCH

4.53k

22nF TIMEOUT = 200ms

1k4.53k

VCC

0.1μF

3.3V

COMPARATOR OVERDRIVE PAST THRESHOLD (%)

0.1

400

TYPICAL TRANSIENT DURATION (μs)

500

600

700

1 10 100

2913 TA01b

300

200

100

VCC = 2.3V

VCC = 6V

RESET OCCURS

ABOVE CURVE

LTC2913

2913fb

ABSOLUTE MAXIMUM RATINGS

Terminal Voltages

CC (Note 3) ............................................. –0.3V to 6V

OV, UV ................................................... –0.3V to 16V

TMR ..........................................–0.3V to (VCC + 0.3V)

VHn, VLn, LATCH, DIS .......................... –0.3V to 7.5V

Terminal Currents

VCC ..................................................................+10mA

UV, IOV ............................................................... 10mA

(Notes 1, 2)

VH1

VL1

VH2

VL2

GND

VCC

TMR

LATCH

TOP VIEW

MS PACKAGE

10-LEAD PLASTIC MSOP

TJMAX = 150°C, θJA = 120°C/W

TOP VIEW

DD PACKAGE

10-LEAD (3mm × 3mm) PLASTIC DFN

1VCC

TMR

LATCH

VH1

VL1

VH2

VL2

GND

TJMAX = 150°C, θJA = 43°C/W

EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL

ORDER PART NUMBER MS PART MARKING* ORDER PART NUMBER DD PART MARKING*

LTC2913CMS-1

LTC2913IMS-1

LTC2913HMS-1

LTCKK

LTC2913CDD-1

LTC2913IDD-1

LTC2913HDD-1

LCKN

VH1

VL1

VH2

VL2

GND

VCC

TMR

DIS

TOP VIEW

MS PACKAGE

10-LEAD PLASTIC MSOP

TJMAX = 150°C, θJA = 120°C/W

TOP VIEW

DD PACKAGE

10-LEAD (3mm × 3mm) PLASTIC DFN

1VCC

TMR

DIS

VH1

VL1

VH2

VL2

GND

TJMAX = 150°C, θJA = 43°C/W

EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL

ORDER PART NUMBER MS PART MARKING* ORDER PART NUMBER DD PART MARKING*

LTC2913CMS-2

LTC2913IMS-2

LTC2913HMS-2

LTCKM

LTC2913CDD-2

LTC2913IDD-2

LTC2913HDD-2

LCKP

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

*The temperature grade is identiﬁ ed by a label on the shipping container.

Operating Temperature Range

LTC2913C ................................................ 0°C to 70°C

LTC2913I.............................................. –40°C to 85°C

LTC2913H .......................................... –40°C to 125°C

Storage Temperature Range ................... –65°C to 150°C

Lead Temperature (Soldering, 10 sec)

MSOP ............................................................... 300°C

PACKAGE/ORDER INFORMATION

LTC2913

2913fb

ELECTRICAL CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: All currents into pins are positive; all voltages are referenced to

GND unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VSHUNT VCC Shunt Regulator Voltage ICC = 5mA l6.2 6.6 6.9 V

–40ºC < TA < 125ºC l6.2 6.6 7.0 V

ΔVSHUNT VCC Shunt Regulator Load Regulation ICC = 2mA to 10mA l200 300 mV

VCC Supply Voltage (Note 3) l2.3 VSHUNT V

VCCR(MIN) Minimum VCC Output Valid DIS = 0V l1V

VCC(UVLO) Supply Undervoltage Lockout DIS = 0V, VCC Rising l1.9 2 2.1 V

ΔVCC(UVHYST) Supply Undervoltage Lockout Hysteresis DIS = 0V l52550 mV

ICC Supply Current VCC = 2.3V to 6V l44 80 μA

VUOT Undervoltage/Overvoltage Threshold l492 500 508 mV

tUOD Undervoltage/Overvoltage Threshold to

Output Delay

VHn = VUOT – 5mV or VLn = VUOT + 5mV l50 125 500 μs

IVHL VHn, VLn Input Current l±15 nA

–40ºC < TA < 125ºC l±30 nA

tUOTO UV/OV Time-Out Period CTMR = 1nF l6 8.5 12.5 mS

–40ºC < TA < 125ºC l6 8.5 14 mS

VLATCH(VIH) OV Latch Clear Input High l1.2 V

VLATCH(VIL) OV Latch Clear Input Low l0.8 V

ILATCH LATCH Input Current VLATCH > 0.5V l±1 μA

VDIS(VIH) DIS Input High l1.2 V

VDIS(VIL) DIS Input Low l0.8 V

IDIS DIS Input Current VDIS > 0.5V l123 μA

ITMR(UP) TMR Pull-Up Current VTMR = 0V l–1.3 –2.1 –2.8 μA

–40ºC < TA < 125ºC l–1.2 –2.1 –2.8 μA

ITMR(DOWN) TMR Pull-Down Current VTMR = 1.6V l1.3 2.1 2.8 μA

–40ºC < TA < 125ºC l1.2 2.1 2.8 μA

VTMR(DIS) Timer Disable Voltage Referenced to VCC l–180 –270 mV

VOH Output Voltage High UV/OV VCC = 2.3V, IUV/OV = –1μA l1V

VOL Output Voltage Low UV/OV VCC = 2.3V, IUV/OV = 2.5mA

VCC = 1V, IUV = 100μA

0.1

0.01

0.3

0.15

The l denotes the speciﬁ cations which apply over the full operating

temperature range, otherwise speciﬁ cations are at TA = 25°C. VCC = 3.3V, VLn = 0.45V, VHn = 0.55V, LATCH = VCC,

DIS = Open unless otherwise noted. (Note 2)

Note 3: VCC maximum pin voltage is limited by input current. Since the

VCC pin has an internal 6.5V shunt regulator, a low impedance supply that

exceeds 6V may exceed the rated terminal current. Operation from higher

voltage supplies requires a series dropping resistor. See Applications

Information.

LTC2913

2913fb

Speciﬁ cations are at TA = 25°C, VCC = 3.3V unless otherwise noted.

Supply Current vs Temperature

VCC Shunt Voltage

vs Temperature

VCC Shunt Voltage vs ICC

Typical Transient Duration

vs Comparator Overdrive UV Output Voltage vs VCC

TEMPERATURE (°C)

–50

0.495

TRHESHOLD VOLTAGE, VUOT (V)

0.497

0.499

0.501

–25 025 50

2913 G01

0.503

0.505

0.496

0.498

0.500

0.502

0.504

100

TEMPERATURE (°C)

–50

ICC (μA)

–25 025 50

2913 G02

100

VCC = 5V

VCC = 3.3V

VCC = 2.3V

TEMPERATURE (°C)

–50

6.2

VCC (V)

6.3

6.4

6.5

6.6

6.8

–25 02550

2913 G03

75 100

6.7 10mA

5mA

2mA

1mA

200μA

ICC (mA)

–2 0

6.25

VCC (V)

6.45

6.75

268

2913 G04

6.35

6.65

6.55

410 12

–40°C

25°C

85°C

COMPARATOR OVERDRIVE PAST THRESHOLD (%)

0.1

400

TYPICAL TRANSIENT DURATION (μs)

500

600

700

1 10 100

2913 G05

300

200

100

VCC = 2.3V

VCC = 6V

RESET OCCURS

ABOVE CURVE

SUPPLY VOLTAGE, VCC (V)

UV VOLTAGE (V)

0.4

0.6

0.8

2913 G06

0.2

00.2 0.4 0.6 1.0

0.8

VCC

UV WITH

10k PULL-UP

UV WITHOUT

PULL-UP

TIMING DIAGRAMS

VHn Monitor Timing

VHn Monitor Timing (TMR Pin Strapped to VCC)

VLn Monitor Timing

VLn Monitor Timing (TMR Pin Strapped to VCC)

Input Threshold Voltage

vs Temperature

VHn

VUOT

tUOD tUOTO

2913 TD01

VLn

VUOT

tUOD tUOTO

2913 TD02

VHn

VUOT

tUOD tUOD

2913 TD03

VLn

VUOT

tUOD tUOD

2913 TD04

TYPICAL PERFORMANCE CHARACTERISTICS

LTC2913

2913fb

UV Output Voltage vs VCC UV, ISINK vs VCC

UV/OV Voltage Output Low vs

Output Sink Current

TYPICAL PERFORMANCE CHARACTERISTICS

Reset Timeout Period vs

Temperature

Reset Timeout Period vs

Capacitance

DIS (Pin 8, LTC2913-2): Output Disable Input. Disables

the OV and UV output pins. When DIS is pulled high, the

OV and UV pins are not asserted except during a UVLO

condition. DIS has a weak (2μA) internal pull-down to

GND. Leave DIS open if unused.

Exposed Pad (Pin 11, DFN Package): Exposed Pad may

be left open or connected to device ground.

GND (Pin 5): Device Ground.

LATCH (Pin 8, LTC2913-1): OV Latch Clear/Bypass Input.

When pin is pulled low, OV is latched when asserted. When

pulled high, OV latch is cleared. While held high, OV has

the same delay and output characteristics as UV.

OV (Pin 6): Overvoltage Logic Output. Asserts low when

either VL input voltage is above threshold. Latched low

(LTC2913-1). Held low for programmed delay time after

both VL inputs are valid (LTC2913-2). OV has a weak pull-

up to VCC and may be pulled above VCC using an external

pull-up. Leave OV open if unused.

SUPPLY VOLTAGE, VCC (V)

UV VOLTAGE (V)

2913 G07

01235

VHn = 0.55V

SEL = VCC

SUPPLY VOLTAGE, VCC (V)

PULL-DOWN CURRENT, IUV (mA)

2913 G08

01235

UV AT 150mV

UV AT 50mV

VHn = 0.45V

SEL = VCC

IUV/OV (mA)

UV/OV, VOL (V)

0.2

0.4

0.6

0.8

1.0

85°C–40°C

25°C

510 15 20

2913 G09

25 30

TEMPERATURE (°C)

–50

UV/OV TIMEOUT PERIOD, tUOTO (ms)

–25 02550

2913 G10

75 100

CTMR = 1nF

TMR PIN CAPACITANCE, CTMR (nF)

0.1 1

UV/OV TIMEOUT PERIOD, tUOTO (ms)

100

10000

10 100 1000

2913 G11

1000

Speciﬁ cations are at TA = 25°C, VCC = 3.3V unless otherwise noted.

PIN FUNCTIONS

LTC2913

2913fb

PIN FUNCTIONS

TMR (Pin 9): Reset Delay Timer. Attach an external capacitor

(CTMR) of at least 10pF to GND to set a reset delay time

of 9ms/nF. A 1nF capacitor will generate an 8.5ms reset

delay time. Tie TMR to VCC to bypass timer.

UV (Pin 7): Undervoltage Logic Output. Asserts low when

either VH input voltage is below threshold. Held low for a

programmed delay time after both VH inputs are valid. UV

has a weak pull-up to VCC and may be pulled above VCC

using an external pull-up. Leave UV open if unused.

VCC (Pin 10): Supply Voltage. Bypass this pin to GND with

a 0.1μF (or greater) capacitor. Operates as a direct supply

input for voltages up to 6V. Operates as a shunt regulator for

supply voltages greater than 6V and must have a resistance

between the pin and the supply to limit input current to no

greater than 10mA. When used without a current-limiting

resistance, VCC voltage must not exceed 6V.

VH1/VH2 (Pin 1/Pin 3): Voltage High Inputs 1 and 2. When

the voltage on this pin is below 0.5V, an undervoltage

condition is triggered. Tie pin to VCC if unused.

VL1/VL2 (Pin 2/Pin 4): Voltage Low Inputs 1 and 2. When

the voltage on this pin is above 0.5V, an overvoltage condi-

tion is triggered. Tie pin to GND if unused.

0.5V

–

VL2

–

VH2

–

VL1

–

VH1

–

UVLO

VCC

–

VCC

OV PULSE

GENERATOR

DISABLE

OV LATCH

CLEAR/BYPASS

LTC2913-1

TMRVCC

OV 6

LATCH 8

–

2μA

DIS 8

GND

2913 BD

UV PULSE

GENERATOR

OSCILLATOR

VCC

400k

UV 7

400k

LTC2913-2

BLOCK DIAGRAM

LTC2913

2913fb

APPLICATIONS INFORMATION

Voltage Monitoring

The LTC2913 is a low power dual voltage monitoring

circuit with two undervoltage and two overvoltage inputs.

A timeout period that holds OV and UV asserted after all

faults have cleared is adjustable using an external capacitor

and is externally disabled.

Each voltage monitor has two inputs (VHn and VLn) for

detecting undervoltage and overvoltage conditions. When

conﬁ gured to monitor a positive voltage Vn using the

3-resistor circuit conﬁ guration shown in Figure 1, VHn

is connected to the high side tap of the resistive divider

and VLn is connected to the low side tap of the resistive

divider.

3-Step Design Procedure

The following 3-step design procedure determines ap-

propriate resistances to obtain the desired UV and OV trip

points for the voltage monitor circuit in Figure 1.

For supply monitoring, Vn is the desired nominal operat-

ing voltage, In is the desired nominal current through the

resistive divider, VOV is the desired overvoltage trip point

and VUV is the desired undervoltage trip point.

1. Choose RA to obtain the desired OV trip point

A is chosen to set the desired trip point for the

overvoltage monitor.

RA=0.5V

•Vn

VOV

(1)

2. Choose RB to obtain the desired UV trip point

Once RA is known, RB is chosen to set the desired trip

point for the undervoltage monitor.

RB=0.5V

•Vn

VUV

–RA

(2)

3. Choose RC to complete the design

Once, RA and RB are known, RC is determined by:

RC=Vn

–RA–R

(3)

If any of the variables Vn, In, VUV or VOV change, then each

step must be recalculated.

Voltage Monitor Example

A typical voltage monitor application is shown in Figure 2.

The monitored voltage is a 5V ±10% supply. Nominal cur-

rent in the resistive divider is 10μA.

1. Find RA to set the OV trip point of the monitor.

RA=0.5V

10µA •5V

5.5V 45.3k

2. Find RB to set the UV trip point of the monitor.

RB=0.5V

10µA •5V

4.5V – 45.3k 10.2k

3. Determine RC to complete the design.

RC=5V

10µA – 45.3k 10.2k 442k

Figure 1. 3-Resistor Positive UV/OV Monitoring Conﬁ guration Figure 2. Typical Supply Monitor

–

–0.5V

LTC2913

UVn

VHn

2913 F01

VLn

OVn

VH1

442k

10.2k

45.3k

VCC

GND

LTC2913

VL1

2913 F02

VCC

5V ±10%

LTC2913

2913fb

APPLICATIONS INFORMATION

Power-Up/Power-Down

As soon as VCC reaches 1V during power-up, the UV output

asserts low and the OV output weakly pulls to VCC.

The LTC2913 is guaranteed to assert UV low and OV high

under conditions of low VCC, down to VCC = 1V. Above

VCC = 2V (2.1V maximum), the VH and VL inputs take

control.

Once both VH inputs and VCC are valid, an internal timer

is started. After an adjustable delay time, UV weakly pulls

high.

Threshold Accuracy

Reset threshold accuracy is important in a supply-sensitive

system. Ideally, such a system resets only if supply voltages

fall outside the exact thresholds for a speciﬁ ed margin.

All LTC2913 inputs have a relative threshold accuracy of

±1.5% over the full operating temperature range.

For example, when the LTC2913 is programmed to moni-

tor a 5V input with a 10% tolerance, the desired UV trip

point is 4.5V. Because of the ±1.5% relative accuracy of

the LTC2913, the UV trip point is between 4.433V and

4.567V which is 4.5V ±1.5%.

Likewise, the accuracy of the resistances chosen for RA,

RB and RC can affect the UV and OV trip points as well.

Using the example just given, if the resistances used to

set the UV trip point have 1% accuracy, the UV trip range

is between 4.354V and 4.650V. This is illustrated in the

following calculations.

The UV trip point is given as:

VUV =0.5V 1+RC

RA+RB











The two extreme conditions, with a relative accuracy of

1.5% and resistance accuracy of 1%, result in:

VUV(MIN) =0.5V • 0.985 • 1+RC• 0.99

RA+RB

()

• 1.01











and

VUV(MAX) =0.5V • 1.015 • 1+RC• 1.01

RA+RB

()

• 0.99











For a desired trip point of 4.5V, RC

RA+RB

Therefore,

VUV(MIN) =0.5V • 0.985 • 1+80.99

1.01









=4.354V

and

VUV(MAX) =0.5V • 1.015 • 1+81.01

0.99









=4.650V

Glitch Immunity

In any supervisory application, noise riding on the moni-

tored DC voltage causes spurious resets. To solve this

problem without adding hysteresis, which causes a new

error term in the trip voltage, the LTC2913 lowpass ﬁ lters

the output of the ﬁ rst stage comparator at each input. This

ﬁ lter integrates the output of the comparator before as-

serting the UV or OV logic. A transient at the input of the

comparator of sufﬁ cient magnitude and duration triggers

the output logic. The Typical Performance Characteristics

show a graph of the Transient Duration vs. Comparator

Overdrive.

LTC2913

2913fb

UV/OV Timing

The LTC2913 has an adjustable timeout period (tUOTO) that

holds OV or UV asserted after all faults have cleared. This

assures a minimum reset pulse width allowing a settling

time delay for the monitored voltage after it has entered

the valid region of operation.

When any VH input drops below its designed threshold,

the UV pin asserts low. When all inputs recover above

their designed thresholds, the UV output timer starts. If

all inputs remain above their designed thresholds when

the timer ﬁ nishes, the UV pin weakly pulls high. However,

if any input falls below its designed threshold during this

timeout period, the timer resets and restarts when all inputs

are above the designed thresholds. The OV output behaves

as the UV output when LATCH is high (LTC2913-1).

Selecting the UV/OV Timing Capacitor

The UV and OV timeout period (tUOTO) for the LTC2913

is adjustable to accommodate a variety of applications.

Connecting a capacitor, CTMR, between the TMR pin and

ground sets the timeout period. The value of capacitor

needed for a particular timeout period is:

TMR = tUOTO • 115 • 10–9 [F/s]

The Reset Timeout Period vs Capacitance graph found in

the Typical Performance Characteristics shows the desired

delay time as a function of the value of the timer capacitor

that must be used. The TMR pin must have a minimum

10pF load or be tied to VCC. For long timeout periods, the

only limitation is the availability of a large value capacitor

with low leakage. Capacitor leakage current must not exceed

the minimum TMR charging current of 1.3μA. Tying the

TMR pin to VCC will bypass the timeout period.

Undervoltage Lockout

When VCC falls below 2V, the LTC2913 asserts an

undervoltage lockout (UVLO) condition. During UVLO,

UV is asserted and pulled low while OV is cleared and

blocked from asserting. When VCC rises above 2V, UV

follows the same timing procedure as an undervoltage

condition on any input.

Shunt Regulator

The LTC2913 has an internal shunt regulator. The VCC pin

operates as a direct supply input for voltages up to 6V.

Under this condition, the quiescent current of the device

remains below a maximum of 80μA. For VCC voltages higher

than 6V, the device operates as a shunt regulator and must

have a resistance RZ between the supply and the VCC pin

to limit the current to no greater than 10mA.

When choosing this resistance value, select an appropriate

location on the I-V curve shown in the Typical Performance

Characteristics to accommodate any variations in VCC due

to changes in current through RZ.

UV and OV Output Characteristics

The DC characteristics of the UV and 0V pull-down strength

are shown in the Typical Performance Characteristics. Each

pin has a weak internal pull-up to VCC and a strong pull-

down to ground. This arrangement allows these pins to

have open-drain behavior while possessing several other

beneﬁ cial characteristics. The weak pull-up eliminates the

need for an external pull-up resistor when the rise time on

the pin is not critical. On the other hand, the open-drain

conﬁ guration allows for wired-OR connections, and is

useful when more than one signal needs to pull down

on the output. VCC of 1V guarantees a maximum VOL =

0.15V at UV.

At VCC = 1V, the weak pull-up current on OV is barely turned

on. Therefore, an external pull-up resistor of no more than

100k is recommended on the OV pin if the state and pull-up

strength of the OV pin is crucial at very low VCC.

Note however, by adding an external pull-up resistor, the

pull-up strength on the OV pin is increased. Therefore, if

it is connected in a wired-OR connection, the pull-down

strength of any single device must accommodate this

additional pull-up strength.

Output Rise and Fall Time Estimation

The UV and OV outputs have strong pull-down capabil-

ity. The following formula estimates the output fall time

(90% to 10%) for a particular external load capacitance

(CLOAD):

FALL ≈ 2.2 • RPD • CLOAD

APPLICATIONS INFORMATION

LTC2913

2913fb

APPLICATIONS INFORMATION

where RPD is the on-resistance of the internal pull-down

transistor, typically 50Ω at VCC > 1V and at room tem-

perature (25°C). CLOAD is the external load capacitance

on the pin. Assuming a 150pF load capacitance, the fall

time is 16.5ns.

The rise time on the UV and OV pins is limited by a 400k

pull-up resistance to VCC. A similar formula estimates the

output rise time (10% to 90%) at the UV and OV pins:

RISE ≈ 2.2 • RPU • CLOAD

where RPU is the pull-up resistance.

OV Latch (LTC2913-1)

With the LATCH pin held low, the OV pin latches low when

an OV condition is detected. The latch is cleared by raising

the LATCH pin high. If an OV condition clears while LATCH

is held high, the latch is bypassed and the OV pin behaves

the same as the UV pin with a similar timeout period at the

output. If LATCH is pulled low while the timeout period is

active, the OV pin latches as before.

Disable (LTC2913-2)

The LTC2913-2 allows disabling the UV and OV outputs

via the DIS pin. Pulling DIS high will force both outputs

to remain weakly pulled high, regardless of any faults

that occur on the inputs. However, if a UVLO condition

occurs, UV asserts and pulls low, but the timeout function

is bypassed. UV pulls high as soon as the UVLO condition

is cleared.

DIS has a weak 2μA (typical) internal pull-down current

guaranteeing normal operation with the pin left open.

Dual UV/OV Supply Monitor, 10% Tolerance, 5V, 3.3V Supply Monitor Powered from 12V, 10% Tolerance, 12V, 5V

RC2

27.4k

RB1

RC1

44.2k

1VH1

VL1

VH2

GND TMR

SYSTEM

POWER

SUPPLIES

VL2

2913 TA02

LATCH

RA2

4.53k

CTMR

22nF TIMEOUT = 200ms

RB2

RA1

4.53k

VCC

LTC2913-1

CBYP

0.1μF

3.3V

RC2

44.2k

RB1

RC1

115k

10k

1VH1

VL1

VH2

GND

TMR SYSTEM

POWER

SUPPLIES

VL2

2913 TA03

DIS

RA2

4.53k

RB2

RA1

4.53k

VCC

LTC2913-2

CBYP

0.1μF

12V

TYPICAL APPLICATIONS

LTC2913

2913fb

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

PACKAGE DESCRIPTION

DD Package

10-Lead Plastic DFN (3mm × 3mm)

(Reference LTC DWG # 05-08-1699)

MS Package

10-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1661)

3.00 ±0.10

(4 SIDES)

NOTE:

1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).

CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE

TOP AND BOTTOM OF PACKAGE

0.38 ± 0.10

BOTTOM VIEW—EXPOSED PAD

1.65 ± 0.10

(2 SIDES)

0.75 ±0.05

R = 0.115

TYP

2.38 ±0.10

(2 SIDES)

106

PIN 1

TOP MARK

(SEE NOTE 6)

0.200 REF

0.00 – 0.05

(DD10) DFN 1103

0.25 ± 0.05

2.38 ±0.05

(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

1.65 ±0.05

(2 SIDES)2.15 ±0.05

0.50

BSC

0.675 ±0.05

3.50 ±0.05

PACKAGE

OUTLINE

0.25 ± 0.05

0.50 BSC

MSOP (MS) 0603

0.53 ± 0.152

(.021 ± .006)

SEATING

PLANE

0.18

(.007)

1.10

(.043)

MAX

0.17 – 0.27

(.007 – .011)

TYP

0.127 ± 0.076

(.005 ± .003)

0.86

(.034)

REF

0.50

(.0197)

BSC

12345

4.90 ± 0.152

(.193 ± .006)

0.497 ± 0.076

(.0196 ± .003)

REF

8910 76

3.00 ± 0.102

(.118 ± .004)

(NOTE 3)

3.00 ± 0.102

(.118 ± .004)

(NOTE 4)

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.

MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

0.254

(.010) 0° – 6° TYP

DETAIL “A”

GAUGE PLANE

5.23

(.206)

MIN

3.20 – 3.45

(.126 – .136)

0.889 ± 0.127

(.035 ± .005)

RECOMMENDED SOLDER PAD LAYOUT

0.305 ± 0.038

(.0120 ± .0015)

TYP

0.50

(.0197)

BSC

LTC2913

2913fb

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

LT 1007 • REV B • PRINTED IN USA

TYPICAL APPLICATION

Dual UV/OV Supply Monitor with LED Undervoltage and Overvoltage Indicator and Manual

Undervoltage Reset Button, 10% Tolerance, 12V, 5V

PART NUMBER DESCRIPTION COMMENTS

LTC1326/

LTC1326-2.5

Micropower Precision Triple Supply Monitor for 5V/2.5V, 3.3V

and ADJ

4.725V, 3.118V, 1V Threshold (±0.75%)

LTC1726-2.5/

LTC1726-5

Micropower Triple Supply Monitor for 2.5V/5V, 3.3V and ADJ Adjustable RESET and Watchdog Time-Outs

LTC1727-2.5/

LTC1727-5

Micropower Triple Supply Monitor with Open-Drain Reset Individual Monitor Outputs in MSOP

LTC1728-1.8/

LTC1728-3.3

Micropower Triple Supply Monitor with Open-Drain Reset 5-Lead SOT-23 Package

LTC1728-2.5/

LTC1728-5

Micropower Triple Supply Monitor with Open-Drain Reset 5-Lead SOT-23 Package

LTC1985-1.8 Micropower Triple Supply Monitor with Open-Drain Reset 5-Lead SOT-23 Package

LTC2900 Programmable Quad Supply Monitor Adjustable RESET, 10-Lead MSOP and 3mm × 3mm

10-Lead DFN Package

LTC2901 Programmable Quad Supply Monitor Adjustable RESET and Watchdog Timer, 16-Lead SSOP Package

LTC2902 Programmable Quad Supply Monitor Adjustable RESET and Tolerance, 16-Lead SSOP Package,

Margining Functions

LTC2903 Precision Quad Supply Monitor 6-Lead SOT-23 Package, Ultralow Voltage Reset

LTC2904 3-State Programmable Precision Dual Supply Monitor Adjustable Tolerance, 8-Lead SOT-23 Package

LTC2905 3-State Programmable Precision Dual Supply Monitor Adjustable RESET and Tolerance, 8-Lead SOT-23 Package

LTC2906 Precision Dual Supply Monitor 1-Selectable and 1 Adjustable Separate VCC Pin, RST/RST Outputs

LTC2907 Precision Dual Supply Monitor 1-Selectable and 1 Adjustable Separate VCC, Adjustable Reset Timer

LTC2908 Precision Six Supply Monitor (Four Fixed & 2 Adjustable) 8-Lead SOT-23 and DFN Packages

LTC2909 Prevision Dual Input UV, OV and Negative Voltage Monitor Separate VCC Pin, Adjustable Reset Timer, 8-Lead TSOT-23 and

DFN Packages

LTC2910 Octal Positive/Negative Voltage Monitor Separate VCC Pin, Eight Inputs, Up to Two Negative Monitors

Adjustable Reset Timer, 16-Lead SSOP and DFN Packages

LTC2914 Quad UV/OV Positive/Negative Voltage Monitor Separate VCC Pin, Four inputs, Up To Two Negative Monitors,

Adjustable Reset Timer, 16-Lead SSOP and DFN Packages

2.05M

10k100k

510Ω

LED

44.2k

VH1

VL1

VH2

GND TMR

SYSTEM

POWER

SUPPLIES

VL2

2913 TA05

DIS

22nF TIMEOUT = 200ms

4.53k

MANUAL

RESET BUTTON

(NORMALLY OPEN)

VCC

LTC2913-2

0.1μF

12V

510Ω

LED

RELATED PARTS