RT9218B Просмотр технического описания (PDF) - Richtek Technology

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RT9218B

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

Richtek Technology 

RT9218B

Function Block Diagram

VCC

Bias & Regulators

(3V_Logic & 3VDD_Analog)

Reference

0.8VREF

Power On

Reset

DRV

FBL

VCC

+

-

0.6V +

-

0.6V +

-

UV_S

UV_L

Soft-Start

&

Fault Logic

PGOOD

EN

PH_M

+

- 0.15V

+

- 1.5V

3V

40uA

OC

-

0.4V

+

+

-

FB

Timing Diagram

+

EO

+GM

+

-

+-

Oscillator

(300k/600kHz)

GND

Gate Control

Logic

VCC

Specific Power Sequence for LDO

90%

80%

FSB_VTT (1.2V @ 5Amp)

1-10ms

OPS

BOOT

UGATE

PHASE

LGATE

VTT_GD

<1ms

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DS9218B-09 March 2007

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