RT9068-50GSP - Richtek Technology

RT9068

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60V, 30μμ

μμ

μA IQ, Low Dropout Voltage Linear Regulator

General Description

The RT9068 family are high voltage (60V operation), low

quiescent current low dropout linear regulators capable of

supplying 50mA of output current with a maximum dropout

voltage of 300mV. The low quiescent and shutdown

currents (30μA operating and 2μA shutdown) are ideal for

use in battery-powered and/or high voltage systems.

Ground current is well-controlled in all conditions, including

dropout.

The RT9068 family operates with any reasonable output

capacitors including 1μF low-ESR ceramic types and

features excellent line and load transient responses.

Internal protection circuitry includes reverse-battery

protection, current limiting, thermal shutdown, and reverse

current protection. Output voltage accuracy is ±2% over

the entire line and load range.

These devices are available in 3 fixed-output versions

(2.5V, 3.3V, 5V) as well as a version that supports an

adjustable output voltage (1.25V to 60V). All versions

come in SOP-8 and MSOP-8 packages with an exposed

pad for high power dissipation.

Features



Wide Input Voltage Range : 4.5V to 60V



Low Quiescent Current : 30μμ

μμ

μA Operating and 2μμ

μμ

μA

Shutdown



Low Dropout Voltage : 300mV Maximum at 50mA



Fixed (2.5V, 3.3V, 5V) a nd Adjustable (1.25V to 60V)

Versions



±±

±±

±2% Output Tolerance



Stable with 1 μμ

μμ

μF Output Capacitor (Aluminum,

Tantalum or Ceramic)



Inherent Reverse-Current Protection (No diode

needed)



−−

−−

−60V Reverse-Battery Protection

Applications

Low Current, High Voltage Regulators

Battery Powered Applications

Telecom and Datacom Applications

Automotive Application

RT9068 (Adjustable Up to 25V Output)RT9068-25/33/50 RT9068 (Adjustable Up to 60V Output)

Typical Application Circuit

VIN

GND

VOUT

RT9068

VIN VOUT

4.5V to 60V

CIN

0.18µF

SHDN

COUT

1µF

SENSE

2.5V/3.3V/5V

VIN

GND

VOUT

RT9068

VIN VOUT

4.5V to 60V

CIN

0.18µF

SHDN

COUT

1µF

SENSE

1.25V to 25V

VIN

GND

VOUT

RT9068

VIN VOUT

4.5V to 60V

CIN

0.18µF

SHDN

COUT

1µF

SENSE

1.25V to 60V

CCOMP

RT9068

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Pin Configuration

Part No . Output

Voltage Package Marking

Information

RT9068-

25GFP 2.5V

MSOP-8 09=

RT9068-

25GSP

SOP-8 Exposed

Pad–Option 1) RT906825GSP

RT9068-

33GFP 3.3V

MSOP-8 0A=

RT9068-

33GSP

SOP-8 Exposed

Pad–Option 1) RT906833GSP

RT9068-

50GFP 5V

MSOP-8 0B=

RT9068-

50GSP

SOP-8 Exposed

Pad–Option 1) RT906850GSP

RT9068

GFP Adjustable

MSOP-8 08=

RT9068

GSP

SOP-8 Exposed

Pad–Option 1) RT9068GSP

Ordering and Marking Information

RT9068-25/33/50

MSOP-8

VOUT VIN

GND

SHDN

SENSE

2GND

VOUT VIN

GND

SHDN

SENSE

2GND

RT9068

MSOP-8

VOUT

SENSE

VIN

GND

SHDN

GND

RT9068-25/33/50

SOP-8

VOUT

SENSE

VIN

GND

SHDN

GND

RT9068

SOP-8

Note :

Richtek products are :

 RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

 Suitable for use in SnPb or Pb-free soldering processes.

(TOP VIEW)

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Pin Description

Pin No. Name Function

RT9068-

25/33/50GSP/GFP RT9068GSP/GFP

1 1 VOUT

VOUT supplies power to the load. A minimum output

capacitor of 1F is required for stable operation.

2 2 SENSE

Output voltage sense. For applications with VOUT  25V,

SENSE can be connected to the output voltage to optimize

the control loop compensation.

For applications with VOUT > 25V (adjustable versions only),

SENSE must be left unconnected. Control loop compensation

is optimized by adding a feed-forward capacitor in the

feedback resistor divider connected to FB (see Adjustable

Output Voltage and Compensation section).

3 -- NC No internal connection.

-- 3 FB

Feedback input. Connect to the center tap of a resistor divider

for setting the output voltage. (Adjustable versions only)

4 -- NC No internal connection.

5 5 SHDN

Shutdown control input (Active High). Connect SHDN high to

disable the output voltage and reduce the IC’s quiescent

current to 2A (typical). Connect SHDN low to enable the

output. SHDN is a high-voltage input (also able to withstand

reverse voltage) and can be connected directly to a

high-voltage input.

6, 7, 9* 6, 7, 9* GND Ground. The exposed pad should be soldered to a large PCB

and connected to GND for maximum thermal dissipation.

8 8 VIN

Power input. Bypass VIN with a 0.18F or larger capacitor

with adequate voltage rating.

* exposed pad

Functional Block Diagram

RT9068-25/33/50 (Fixed Output) RT9068 (Adjustable Output)

Current Limit

Over-

Temperature

Protection

VIN VOUT

SENSE

GND

Reference

SHDN

Error Amp

VIN VOUT

SENSE

GND

Reference

SHDN

Error Amp

Current Limit

Over-

Temperature

Protection

RT9068

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Operation

The RT9068 is a high input-voltage linear regulator

specifically designed to minimize external components.

The input voltage range is from 4.5V to 60V. The device

supplies 50mA of output current with a maximum dropout

voltage of 300mV. Its 30μA quiescent and 2μA shutdown

currents make it ideal for use in battery-powered

applications. Unlike many PNP LDO regulators, ground

current does not increase much in dropout conditions.

Output Transistor

The RT9068 includes a built-in PNP output transistor

configured for low dropout voltage. The output transistor

blocks reverse current if the output voltage is held higher

than the input voltage (such as in battery-backup

applications) so no additional output blocking diode is

needed.

Error Amplifier

The Error Amplifier compares the output feedback voltage

from an internal feedback voltage divider (fixed output

versions) or FB (adjustable output versions) to an internal

reference voltage and controls the PNP output transistor's

base current to maintain output voltage regulation. The

RT9068's internal dividers are placed between SENSE and

GND and have a divider resistance of about 1MΩ.

Current Limit Protection

The RT9068 provides a current limit function to prevent

damage during output over-load or shorted-circuit

conditions. The output current is detected by an internal

current-sense transistor.

Over-Temperature Protection

The over temperature protection function will turn off the

PNP output transistor when the internal junction

temperature exceeds 155°C (typ.). Once the junction

temperature cools down by approximately 5°C, the

regulator will automatically resume operation.

Reverse-Battery Protection

The RT9068 inputs (VIN and SHDN) can withstand reverse

voltages as high as −60V. Both the IC and the load are

protected, as long as the load impedance is 500Ω or less.

In these conditions, the output voltage is guaranteed to

be no more negative than −1V with the maximum negative

input voltage. In battery-powered applications, no

additional protection against battery reversal is typically

needed.

Reverse-Output Protection

The RT9068 protects against current flow to the input (VIN)

when the output voltage exceeds VIN. This simplifies

battery and capacitive “keep-alive” circuits since they

need no additional output blocking diode.

Shutdown Input (8 Pin Versions)

The RT9068 SHDN input is an active-high input that turns

off the output transistor and reduces the quiescent current

to 2μA typical. Connect SHDN to a voltage below 0.6V for

normal operation.

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Electrical Characteristics

Parameter Symbol Test Conditions Min Typ Max Unit

Input Supply

Operational VIN VIN 0 < IOUT < 50mA 4.5 -- 60 V

Quiescent Current IQ V

IN = 24V, VSHDN = 0V -- 30 40 A

Shutdown Current ISHDN V

IN = 24V, VSHDN = 2.5V, VOUT = 0 -- 2 15 A

Input Reverse Leakage

Current IVINr V

IN = 60V, VOUT = 0V -- -- 0.1 mA

Output Vol t age and Current

Output Current Limit ILIM 120 -- 300 mA

Line Regulation VLINE 5.5V < VIN < 60V, IOUT = 50mA -- 0.5 -- %

Load Regulation VLOAD 0.1mA < IOUT < 50mA -- 0.7 -- %

Absolute Maximum Ratings (Note 1)

VIN to GND ------------------------------------------------------------------------------------------------------------------- −60V to 80V

SHDN to GND --------------------------------------------------------------------------------------------------------------- −60V to 80V

VOUT to GND --------------------------------------------------------------------------------------------------------------- −40V to 80V

SENSE to GND ------------------------------------------------------------------------------------------------------------- −30V to 35V

VIN to VOUT/SENSE when |VIN| ≥ |VOUT| (Normal Operation or Reverse-Battery Condition) -------- −60V to 80V

VIN to VOUT/SENSE when VOUT ≥ VIN ≥ 0 (Reverse-VOUT Condition) ------------------------------------ −35V

FB ------------------------------------------------------------------------------------------------------------------------------ −0.3V to 10V

FB Current ------------------------------------------------------------------------------------------------------------------- −6mA to 6mA

Power Dissipation, PD @ TA = 25°C

MSOP-8 ---------------------------------------------------------------------------------------------------------------------- 2.1W

SOP-8 ------------------------------------------------------------------------------------------------------------------------- 3.26W

Package Thermal Resistance (Note 2)

MSOP-8, θJA ----------------------------------------------------------------------------------------------------------------- 47.4°C/W

MSOP-8, θJC ---------------------------------------------------------------------------------------------------------------- 11.9°C/W

SOP-8, θJA ------------------------------------------------------------------------------------------------------------------- 30.6°C/W

SOP-8, θJC ------------------------------------------------------------------------------------------------------------------- 3.4°C/W

Junction Temperature ------------------------------------------------------------------------------------------------------ 150°C

Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------- 260°C

Storage Temperature Range --------------------------------------------------------------------------------------------- −65°C to 150°C

ESD Susceptibility (Note 3)

HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV

Recommended Operating Conditions (Note 4)

Supply Input Voltage ------------------------------------------------------------------------------------------------------- 4.5V to 60V

Junction Temperature Range --------------------------------------------------------------------------------------------- −40°C to 125°C

Ambient Temperature Range --------------------------------------------------------------------------------------------- −40°C to 85°C

(4.5V < VIN < 60V, VSHDN = 0V, TA = 25°C, unless otherwise specified)

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Parameter Symbol Test Conditions Min Typ Max Unit

FB Regulation

Voltage RT9068 VFB 0 < IOUT < 50mA 1.225 1.25 1.275 V

Output Voltage

RT9068-25

VOUT

0 < IOUT < 50mA 2.45 2.5 2.55

RT9068-33 0 < IOUT < 50mA 3.24 3.3 3.36

RT9068-50 5.4V < VIN < 60V, 0 < IOUT < 50mA 4.9 5 5.1

FB Input Bias

Current RT9068 IFB -- 20 100 nA

Output Voltage with Reverse

Polarity VIN VROUT V

IN = 60V, RL = 500 -- -- 1 V

Dropout Voltage VDROP

IOUT = 1mA -- 15 80

IOUT = 10mA -- 55 150

IOUT = 50mA -- 150 300

Power Supply Rejection Rate PSRR f = 1kHz, IOUT = 50mA -- 60 -- dB

Output Noise Voltage VON I

OUT = 50mA, f = 10Hz to 100kHz -- 200 -- VRMS

Shutdown

Shutdown Output Voltage VOUTSD SHDN = VIN -- -- 100 mV

SHDN High Threshold VIH -- 1.6 2.2 V

SHDN Low Threshold VIL 0.6 1.2 -- V

SHDN Input Bias Current ISHDN SHDN = VIN -- 0.6 1.2

A

VSHDN = 0V -- -- 0.1

Thermal Protection

Thermal Shutdown TSD 145 155 165 C

Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are

stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in

the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may

affect device reliability.

Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is

measured at the exposed pad of the package.

Note 3. Devices are ESD sensitive. Handling precaution is recommended.

Note 4. The device is not guaranteed to function outside its operating conditions.

RT9068

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Typical Operating Characteristics

PSRR

-80

-70

-60

-50

-40

-30

-20

-10

10 100 1000 10000 100000 1000000

Frequency (Hz)

PSRR/dB

IOUT = 50mA

COUT = 1μF

COUT = 10μF

(TA = 25°C, CIN = 0.18μF, COUT = 1μF, unless otherwise specified)

SHDN Threshold Voltage vs. Tem pe rature

0.0

0.5

1.0

1.5

2.0

2.5

-50 -25 0 25 50 75 100 125 150

Temperature (°C)

SHDN Threshold Voltage (V

)

VIN = 14V

VIH

VIL

Quiescent Current vs. Temperature

-50 -25 0 25 50 75 100 125

Temperature (°C)

Quiescent Current (μA

)

SHDN_High

SHDN_Low

VIN = 14V

Output Voltage v s. Temperature

3.1

3.2

3.3

3.4

-50 -25 0 25 50 75 100 125

Temperature(°C)

Output Voltage (V)

IOUT = 10mA

VIN = 14V

IOUT = 1mA

Quiescent Current vs. Input Voltage

0 102030405060

Input Voltage (V)

Quiescent Current (μA

)

SHDN_High

SHDN_Low

VIN = 4.5V to 60V

Output Voltage vs. Output Current

-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0 1020304050

Output Current (mA)

Output Voltage (%) 1

VIN = 14V

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Leakage Current vs. Reverse Voltage

0.00

0.05

0.10

0.15

0.20

0.25

0.30

-80 -70 -60 -50 -40 -30 -20 -10 0

Reverse Voltage (V)

Leakage Current (mA) 1

SHDN = VIN, VOUT = SENSE = GND

Output Noise vs. Frequency

100

120

140

160

180

200

10 100 1000 10000 100000

Frequency (Hz)

Output Noise (µV)

VIN = 12V, IOUT = 10mA

Ground Current vs. Output Curre nt

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0 1020304050

Output Current (mA)

Ground Current (mA

)

In Dropout

2V Dropout

Current Limit vs . Input Voltage

110

130

150

170

190

210

0 102030405060

Input Voltage (V)

Current Limit (mA)

TA = 125°C

TA = −40°C

Dropout Voltage vs. Tem pe rature

100

150

200

250

-50 -25 0 25 50 75 100 125

Temperature (°C)

Dropout Voltage (mV)

IOUT = 0mA

IOUT = 1mA

IOUT = 10mA

IOUT = 20mA

IOUT = 30mA

IOUT = 40mA

IOUT = 50mA

Output Vol tage vs. I nput Voltage

3.20

3.22

3.24

3.26

3.28

3.30

3.32

3.34

3.36

3.38

3.40

0 102030405060

Input Voltage (V)

Output Voltage (V) 1

IOUT = 0mA

IOUT = 1mA

IOUT = 5mA

IOUT = 10mA

IOUT = 20mA

IOUT = 30mA

IOUT = 40mA

IOUT = 50mA

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VOUT vs. VIN

Time (1ms/Div)

VOUT

(2V/Div)

VIN

(50V/Div)

IOUT = 50mA

Load Transient Response

Time (10μs/Div)

VOUT_ac

(50mV/Div)

VIN = 14V, VOUT = 3.3V

IOUT

(20mA/Div) IOUT = 10mA to 60mA to 10mA

Load Transient Response

Time (10μs/Div)

VOUT_ac

(20mV/Div)

VIN = 14V, VOUT = 3.3V

IOUT

(20mA/Div) IOUT = 10mA to 40mA to 10mA

Line Transient Response

Time (25μs/Div)

VOUT_ac

(100mV/Div)

VIN

(10V/Div)

IOUT = 20mA

Load Transient Response

Time (25μs/Div)

VOUT_ac

(50mV/Div)

IOUT

(20mA/Div)

VIN = 14V, VOUT = 3.3V,

IOUT = 1mA to 50mA to 1mA

Minimum Input Voltage vs. Temperature

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

-50 -25 0 25 50 75 100 125

Temperature (°C)

Minimum Input Voltage (V

)

IOUT = 50mA

IOUT = 10mA

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Turn-On by SHDN at 50mA Load

Time (500μs/Div)

VOUT

(1V/Div)

IOUT

(50mA/Div)

VIN = 60V, VOUT = 3.3V,

IOUT = 50mA

SHDN

(2V/Div)

Power-On at 50mA Load

Time (50μs/Div)

VOUT

(1V/Div)

IOUT

(50mA/Div)

VIN = 60V, VOUT = 3.3V,

IOUT = 50mA

VIN

(50V/Div)

Power-On at No Load

Time (50μs/Div)

VOUT

(1V/Div)

IOUT

(50mA/Div)

VIN = 60V, VOUT = 3.3V,

IOUT = 0mA

VIN

(50V/Div)

Turn-On by SHDN at No Load

Time (500μs/Div)

VOUT

(1V/Div)

IOUT

(50mA/Div)

VIN = 60V, VOUT = 3.3V,

IOUT = 0mA

SHDN

(2V/Div)

RT9068

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Applications Information

The RT9068 is a high input-voltage linear regulator

specifically designed to minimize external components.

The input voltage range is from 4.5V to 60V. The device

supplies 50mA of output current with a maximum dropout

voltage of 300mV.

Fixed VOUT Applications

The fixed output versions are equipped with internal

resistive dividers to set the output voltage to 2.5V, 3.3V,

or 5V, respectively. The total resistance of the each internal

feedback divider is about 1MΩ The internal dividers connect

between SENSE and GND, with the midpoint connecting

to the input of the error amplifier. These versions are all

internally compensated.

Adjustable Output Voltage and Compensation

RT9068

The adjustable output versions may be set to provide from

1.25V to 60V, using external feedback voltage divider

resistors (Figure 1). These included an internal feed-

forward compensation capacitor, connected between

SENSE and FB, which may be used when regulating at

output voltages up to 25V. To achieve the correct

compensation (together with your external FB divider, use

an upper divider resistor (R1) value between 500kΩ and

1MΩ. Calculate R2 according to the following formula :

R2 = R1 / (VOUT / 1.25V − 1).

For output voltages greater than 25V an external feed-

forward capacitor (Figure 2) should be used and SENSE

should be left unconnected. Choose a lower divider resistor

(R2) at least 10kΩ and calculate R1 according to the

following formula : R1 = R2 x (VOUT / 1.25V − 1), Then,

calculate the compensation capacitor (CCOMP) value

according to the following formula : CCOMP = 25μs / R1.

Figure 1. RT9068 Adjustable Output Up to 25V

Figure 2. RT9068 Adjustable Output Above 25V

VIN

GND

VOUT

RT9068

VIN VOUT

4.5V to 60V CIN

0.18µF

SHDN

COUT

1µF

SENSE

1.25V to 25V

Remote-Sense Applications

Since VOUT and SENSE (and FB) are separate pins, it is

possible to connect SENSE to the output voltage remotely

at the load (as long as the output voltage is 25V or less).

FB can also be connected remotely, with SENSE

unconnected if the output exceeds 25V. Remote sensing

eliminates output voltage errors due to any resistive voltage

drop between VOUT and the load. (Voltage drops in the

ground connection cannot be compensated.)

Added External NPN for High-Current Applications

Higher output currents and/or increased power dissipation

are possible using an external NPN output transistor. VOUT

drives the base of the transistor and SENSE and/or FB

monitors the actual output voltage, as in normal

applications. The fixed-output versions (Figure 3) or

adjustable-output version (Figure 4) can be used.

Figure 3 and Figure 4 have no current limit and should be

used with care. If a crude current limit is desired, add the

two diodes and resistor shown in Figure 5. The approximate

current limit is 0.7V/R3. Any small switching diodes can

be used and size R3 for the power dissipated in R3, which

is typically 0.7V x 0.7V / R3.

Figure 3. RT9068-25/33/50 External Transistor

Application

VIN

GND

VOUT

RT9068

VIN

VOUT

4.5V to 60V CIN

0.18µF

SHDN COUT

10µF

SENSE 2.5V/3.3V/5V

100

MJD31C

VIN

GND

VOUT

RT9068

VIN

4.5V to 60V CIN

0.18µF

SHDN

COUT

1µF

SENSE R1

CCOMP

VOUT

1.25V to 60V

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Figure 4. RT9068 External Transistor Application

Figure 5. RT9068 External Transistor Application

with Current Limit

Component Selection

A low-ESR capacitor such as ceramic type must be

connected between VIN and GND with short, wide traces

to bypass input noise. RT9068 is designed to work with

small input capacitor to reduce the cost from high-voltage

low-ESR requirement. To guarantee a minimum 0.1μF input

capacitance, a ceramic 0.18μF input capacitor with an

appropriate voltage rating is recommended.

The RT9068 operates with any reasonable output capacitor

including low-ESR ceramic types. Low-ESR aluminum and

tantalum capacitor may also be used. A minimum of 1μF

is recommended and much higher values are also

acceptable. Connect the output capacitor between VOUT

and GND with short, wide traces to keep the circuit stable.

Thermal Considerations

For continuous operation, do not exceed absolute

maximum junction temperature. The maximum power

dissipation depends on the thermal resistance of the IC

package, PCB layout, rate of surrounding airflow, and

difference between junction and ambient temperature. The

maximum power dissipation can be calculated by the

following formula :

Figure 6. Derating Curve of Maximum Power Dissipation

PD(MAX) = (TJ(MAX) − TA) / θJA

where TJ(MAX) is the maximum junction temperature, TA is

the ambient temperature, and θJA is the junction to ambient

thermal resistance.

For recommended operating condition specifications, the

maximum junction temperature is 125°C. The junction to

ambient thermal resistance, θJA, is layout dependent. For

MSOP-8 (Exposed Pad) package, the thermal resistance,

θJA, is 47.4°C/W on a standard JEDEC 51-7 four-layer

thermal test board. For SOP-8 (Exposed Pad) package,

the thermal resistance, θJA, is 30.6°C/W on a standard

JEDEC 51-7 four-layer thermal test board. The maximum

power dissipation at TA = 25°C can be calculated by the

following formulas :

PD(MAX) = (125°C − 25°C) / (47.4°C/W) = 2.1W for

MSOP-8 (Exposed Pad) package

PD(MAX) = (125°C − 25°C) / (30.6°C/W) = 3.26W for

SOP-8 (Exposed Pad) package

The maximum power dissipation depends on operating

ambient temperature for fixed TJ(MAX) and thermal

resistance, θJA. The derating curves in Figure 6 allow the

designer to see the effect of rising ambient temperature

on the maximum power dissipation.

VIN

GND

VOUT

RT9068

VIN

4.5V to 60V CIN

0.18µF

SHDN

COUT

10µF

SENSE

100

MJD31C

1N4148 x 2 R3

VOUT

2.5V/3.3V/5V

VIN

GND

VOUT

RT9068

VIN

4.5V to 60V CIN

0.18µF

SHDN

SENSE

COUT

10µF

CCOMP

100 VOUT

1.25V to 60V

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0 25 50 75 100 125

Ambient Temperature (°C)

Maximum Power Dissipation (W) 1

Four-Layer PCB

SOP-8 (Exposed Pad)

MSOP-8

(Exposed Pad)

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Figure 7. PCB Layout Guide

Layout Consideration

VOUT

SENSE

VIN

GND

SHDN

GND

COUT

VOUT CIN

GND

VIN

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RT9068

EE1

bA1 A2

EXPOSED THERMAL PAD

(Bottom of Package)

Dimens ions In M illimeters Dimension s In Inc hes

Symbol Min Max Min Max

A 0.810 1.100 0.032 0.043

A1 0.000 0.150 0.000 0.006

A2 0.750 0.950 0.030 0.037

b 0.220 0.380 0.009 0.015

D 2.900 3.100 0.114 0.122

e 0.650 0.026

E 4.800 5.000 0.189 0.197

E1 2.900 3.100 0.114 0.122

L 0.400 0.800

0.016 0.031

U 1.300 1.700

0.051 0.067

V 1.500 1.900

0.059 0.075

8-Lead MSOP (Exposed Pad) Plastic Package

Outline Dimension

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RT9068

Richtek Technology Corporation

14F, No. 8, Tai Yuen 1st Street, Chupei City

Hsinchu, Taiwan, R.O.C.

Tel: (8863)5526789

Richtek products are sold by description only. Customers should obtain the latest relevant information and data sheets before placing orders and should verify

that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek

product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use;

nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent

or patent rights of Richtek or its subsidiaries.

EXPOSED THERMAL PAD

(Bottom of Package)

8-Lead SOP (Exposed Pad) Plastic Package

Dime nsions In M illimeters Dim e nsions In Inches

Symbol Min Max Min Max

A 4.801 5.004 0.189 0.197

B 3.810 4.000 0.150 0.157

C 1.346 1.753 0.053 0.069

D 0.330 0.510 0.013 0.020

F 1.194 1.346 0.047 0.053

H 0.170 0.254 0.007 0.010

I 0.000 0.152 0.000 0.006

J 5.791 6.200 0.228 0.244

M 0.406 1.270 0.016 0.050

X 2.000 2.300 0.079 0.091

Option 1 Y 2.000 2.300 0.079 0.091

X 2.100 2.500 0.083 0.098

Option 2 Y 3.000 3.500 0.118 0.138