RichTek RT9161 User Manual

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300/500mA Low Dropout Linear Voltage Regulator

RT9161/A

General Description

The RT9161/A is a 300/500mA fixed output voltage low

dropout linear regulator. Typical ground current is

approximately 110μA, from zero to maximum loading

conditions. Wide range of available output voltage fits most

of applications. Built-in output current-limiting most

thermal-limiting provide maximal protection against any

fault conditions.

For ease of application, the RT9161/A comes in the popular

3-pin SOT-23 (300mA), SOT-89 (300mA), SOT-223

(500mA), or TO-92 packages.

Ordering Information

RT9161/A-

Package Type
V : SOT-23-3
X : SOT-89
G : SOT-223
ZL : TO-92 (L-Type)
ZT : TO-92 (T-Type)

Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard

Output Voltage
15 : 1.5V
16 : 1.6V
:
49 : 4.9V
50 : 5.0V

500mA Output Current
300mA Output Current

Features

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Low Dropout Voltage of 200mV at Output Current

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100mA, 450mV at Output Current 300mA, and
750mV at 500mA Output Current

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z Guaranteed 300/500mA Output Current

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z Internal 1.5

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z Low Ground Current 1 10

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z 2% Accura cy Output Voltage

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z Input Voltage Range up to 12V

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z Extremely Tight Load Regulation

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z Fast T ran sient Respon se

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z Current-limiting and Thermal-limiting

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z RoHS Compliant and 100% Lead (Pb)-Free

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ΩΩ

Ω P-MOSFET Draws No Base Current

ΩΩ

μμ

μA

μμ

Applications

z Voltage Regulator for LAN Card, CD-ROM, and DVD

z Wireless Communication Systems

z Battery Powered Systems

Marking Information

For marking information, contact our sales representative

directly or through a RichTek distributor located in your

area, otherwise visit our website for detail.

Pin Configurations

(TOP VIEW)

VIN

3

1

2

123

Note :

RichTek Pb-free products are :

−RoHS compliant and compatible with the current require-

GND VOUT

SOT-23-3

GND

VIN

(TAB)

SOT-89

VOUT

ments of IPC/JEDEC J-STD-020.

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

−100%matte tin (Sn) plating.

GND

2

1

VIN

(TAB)

3

VOUT

SOT-223

DS9161/A-29 June 2005 www.richtek.com

1

RT9161/A

3

2

1VIN

TO-92

RT9161/A-

CZL

Typical Application Circuit

V

IN

Functional Pin Description

Pin Name Pin Function

C
1uF

VOUT

GND

3

2

1

VOUT

VIN

GND

TO-92

RT9161/A-

+

IN

RT9161/A

VIN

GND

VOUT

+

C

OUT

10uF

Electrolytic

V

OUT

CZT

VOUT Output Voltage

GND Ground

VIN Power Input

Function Block Diagram

VIN

Current

Limiting

Sensor

Thermal

Shutdown

Error Amp

1.2V

Reference

VOUT

+

-

GND

DS9161/A-29 June 2005www.richtek.com

2

RT9161/A

Absolute Maximum Ratings

z Input Voltage ----------------------------------------------------------------------------------------------------------- −0.3 to 14V
z Operating Junction Temperature Range ------------------------------------------------------------------------- −40°C to 125°C
z Storage Temperature Range --------------------------------------------------------------------------------------- −65°C to 150°C

z Power Dissipation, P

SOT-23-3 --------------------------------------------------------------------------------------------------------------- 0.4W

SOT-89 ------------------------------------------------------------------------------------------------------------------ 0.571W

SOT-223 ---------------------------------------------------------------------------------------------------------------- 0.741W

TO-92 -------------------------------------------------------------------------------------------------------------------- 0.625W

z Package Thermal Resistance (Note 4)

SOT-23-3, θJA---------------------------------------------------------------------------------------------------------- 250°C/W

SOT-23-3, θJC--------------------------------------------------------------------------------------------------------- 140°C/W

SOT-89, θJA------------------------------------------------------------------------------------------------------------ 175°C/W

SOT-89, θJC------------------------------------------------------------------------------------------------------------ 100°C/W

SOT-223, θJA----------------------------------------------------------------------------------------------------------- 135°C/W

SOT-223, θJC---------------------------------------------------------------------------------------------------------- 15°C/W

TO-92, θJA-------------------------------------------------------------------------------------------------------------- 160°C/W

TO-92, θJC-------------------------------------------------------------------------------------------------------------- 125°C/W

D

@ T

= 25°C

A

Electrical Characteristics

(TA = 25°C, CIN = 1μF, C

Parameter Symbol Test Conditions Min Typ Max Units

Output Voltage Accuracy

Output Voltage Temperature
Coefficient

Line Regulation

Load Regulation (Note1)

Current Limit
(Note 2)

Dropout Voltage (Note 3)

Standby Current

Note 1. Regulation is measured at constant junction temperature, using pulsed ON time.
Note 2. Current Limit is measured at constant junction temperature, using pulsed ON time.
Note 3. The dropout voltage is defined as V

Note 4. θ

is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of

JA

JEDEC 51-3 thermal measurement standard.

= 10μF, unless otherwise specified.)

OUT

ΔV

I

OUT

= 1mA, V

L

ΔV

ΔV

IL = 1mA, VIN= 4.5 ~ 12V

LINE

IL = 1mA ~ 300/500mA, VIN = 5V

LOAD

RT9161

I

V

RT9161A

LIM

V

DROP

I

STANDBY IL

IN

IL = 300/500mA

= 0, VIN = 12V

-V

IN

OUT

= 5V

IN

= 5V, V

, which is measured when V

OUT

= 0V

-2 -- +2 %

-- 50 150

-- 2 3 %V

-- 1 30/50 mV

350 580 --

500 900 --

-- 450/750 600/1000 mV

-- 110 180

is V

OUT

OUT(NORMAL)

− 100mV.

PPM/°C

OUT

mA

μA

DS9161/A-29 June 2005 www.richtek.com

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