RT9218 查看數據表（PDF） - Richtek Technology

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产品描述 (功能)

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RT9218

5V/12V Synchronous Buck PWM DC-DC and Linear Power Controller

Richtek Technology 

RT9218

Function Block Diagram

VCC

Bias & Regulators

(3V_Logic & 3VDD_Analog)

Reference

0.8VREF

Power On

Reset

DRV

FBL

PGOOD

VCC

+

-

0.64V +

-

0.64V +

-

UV_S

UV_L

Soft-Start

&

Fault Logic

EN

PH_M

+

- 0.15V

+

- 1.5V

3V

40uA

OC

-

0.4V

+

+

-

FB

++GM

EO

-

+

Gate Control

+

-

Logic

VCC

Oscillator

(300k/600kHz)

GND

OPS

BOOT

UGATE

PHASE

LGATE

Timing Diagram

Specific Power Sequence for LDO

90%

80%

FSB_VTT (1.2V @ 5Amp)

1-10ms

VTT_GD

<1ms

www.richtek.com

4

DS9218-08 March 2007

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