RT9264CS Просмотр технического описания (PDF) - Unspecified

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RT9264CS

High Frequency, High Efficiency, Step-up DC/DC Converter

Unspecified 

Preliminary

RT9264

Pin Description

Pin No. Pin Name Pin Function

1 GND

Ground

2 EXT

Output pin for driving external NMOS or NPN

When driving an NPN, a resistor should be added for limiting base current.

3 LFB

Feedback pin of the built-in LDO (Internal Vref = 0.86V)

4

LDOO

Voltage output pin of the built-in LDO

5 FB

Feedback input pin

Internal reference voltage for the error amplifier is 1.25V.

6 VDD

7 LX

Input positive power pin of RT9264

Pin for switching

8 CE

Chip enable

RT9264 gets into shutdown mode when CE pin set to low.

Function Block Diagram

VDD

LDOO

LFB

FB

CE

Q2 VDD

PMOS

RT9264

1.25V

VDD 1.25V

Loop Control Circuit

R2

Q3

Over Temp.

NMOS Detector

Shut Down

EXT

LX

Q1

NMOS

R1

GND

DS9264-00 December 2001

www.richtek-ic.com.tw

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