Richtek RT9161-15PX, RT9161-18PV, RT9161-18PX, RT9161-20PV, RT9161-21PX Schematic [ru]

RT9161/A

300/500mA Low Dropout Linear Voltage Regulator

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)

Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)

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

500mA Output Current
300mA Output Current

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.

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 V oltage

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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 ra nsient 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.

Pin Configurations

(TOP VIEW)

VIN

3

123

VIN

GND

VOUT

(TAB)

SOT-89

GND

SOT-23-3

2

VOUT

2

1

GND

(TAB)

VIN

3

VOUT

SOT-223

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RT9161/A

3

2

1VIN

TO-92 (L-Type)

Typical Application Circuit

V

IN

Functional Pin Description

Pin Name Pin Functio n

VOUT Output Voltage.

GND Ground.

C
1uF

VOUT

GND

3

2

1

VOUT

VIN

GND

TO-92 (T-Type)

+

IN

RT9161/A

VIN

GND

VOUT

+

C

OUT

10uF

Electrolytic

V

OUT

VIN Power Input.

Function Block Diagram

VIN

Current

Limiting

Sensor

Thermal

Shutdown

Error Amp

1.2V

Reference

VOUT

+

-

GND

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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 1)

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 Unit

Output Voltage Accuracy

Output Voltage Temperature

Coefficient

Line Regulation

Load Regulation (Note 2)

Current Limit
(Note 3)

Dropout Voltage (Note 4)

Standby Current

Note 1. θ

Note 2. Regulation is measured at constant junction temperature, using pulsed ON time.
Note 3. Current Limit is measured at constant junction temperature, using pulsed ON time.
Note 4. The dropout voltage is defined as V

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

= 5V −2 -- 2 %

IN

-- 50 150

ΔV

IL = 1mA, VIN= 4.5 to 12V

LINE

ΔV

IL = 1m A to 300/500mA, VIN = 5V

LOAD

-- 2 3

-- 1 30/50 mV

RT9161 350 580 --

RT9161A

VIN = 5V, V

I

LIM

V

IL = 300/500mA

DROP

I

STANDBY IL

= 0, VIN = 12V

− V

IN

, which is measured when V

OUT

OUT

= 0V

500 900 --

-- 450/750 600/1000 mV

-- 110 180

is V

OUT

OUT(NORMAL)

− 100mV.

PPM/°C

%V

OUT

mA

μA

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RT9161/A

>2 >

)

(

)

>2 >

)

(

)

Typical Operating Characteristics

Temperature Stability

3.4

V

= 3.3V

(°C)

OUT

V

OUT

OUT

125°C

= 2.5V

)

25°C

3.2

3

2.8

Output Voltage (V)

2.6

2.4

-50-250 255075100125

Temperature

Dropout Voltage (VIN-V

1

0.8

0.6

0.14

0.12

0.10

0.08

0.06

0.04

Quiescient Current (mA)

0.02

0.00

-30 0 30 60 90 120

Temperature

(°C)

Short Circuit Current

1.4

Quiescient Current vs. Temperature

1.2

1

0.8

125°C

25°C

VIN = 5V

0.4

Dropout Voltage (V)

0.2

V

= 3.3V

0

0 100 200 300 400 500

I

(mA)

Load

7

V

6

5

Input Voltage

Deviation

4

100

0

1

-100

Deviation (mV)

Output Voltage

-200

Line Transient Response

C

= 10μF Electrolytic

OUT

I

= 0.1A

OUT

T

≈

T

Time (100μS/Div

Time (100μs/Div)

OUT

V

OUT

= 25°C

T

A

= 3.3V

0.6

0.4

Short Circuit Current (A)

0.2

0

0246810

Input/Output Differential (V)

7

V

6

5

Input Voltage

Deviation

4

Line Transient Response

C

= 10μF Electrolytic

OUT

I

= 0.1A

OUT

T

V

OUT

T

= 25°C

A

= 2.5V

≈

T

Time (100μS/Div

Time (100μs/Div)

Output Voltage

Deviation (mV)

100

-100

-200

0

1

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