RT9179 Просмотр технического описания (PDF) - Richtek Technology

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RT9179

Adjustable, 300mA LDO Regulator with Enable

Richtek Technology 

RT9179

Typical Application Circuit

RT9179CB

VIN

VIN

VOUT

Chip Enable

R1

C3

0.1uF

EN

C1

1uF

GND ADJ

R2

VOUT = 1.175 x (

1+ R1

R2

) Volts

Adjustable Operation

Note: The external feedback resistors are in hundreds of OHM to hundreds of KOHM ranges.

VOUT

C2

1uF

Functional Pin Description

Pin No. Pin Name

Pin Function

1 VIN

2 GND

3 EN

4 ADJ

Power Input Voltage

Ground

Chip Enable (Active High)

Adjust Output Voltage. The output voltage is set by the internal feedback resistors when

this pin grounded. If external feedback resistors are applied, the output voltage will be:

VOUT = 1.175 × (1 +

R1 ) Volts

R2

5 VOUT

Output Voltage

Function Block Diagram

Shutdown

EN

and

Logic Control

Current-Limit

and

Thermal Protection

1.175V

VREF

+_

Error

Amplifier

MOS

Driver

Thermal

SHDN

VIN

VOUT

ADJ

GND

www.richtek.com

2

DS9179-08 March 2007

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