RT9643 datasheet(6/17 Pages) RICHTEK

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RT9643

DS9643-03 August 2007

www.richtek.com

Function Block Diagram

Functional Pin Description

1.2V_DRV (Pin1)

Gate drive for 1.2V linear controller. The pin will be turned

off (low) in S3 and S5 state.

1.2V_FB (Pin2)

Feedback for the 1.2V linear controller. The pin is applied

for 1.2V LDO output regulation sense. The voltage can be

disabled by pulling the pin higher than 0.9V.

5VSB_DRV (Pin3)

5VSB Control Switch. The pin is applied to drive an external

P-Channel MOSFET to switch 5VDL power to 5VSB in

S3 stage. The pin goes high in S0 and S5.

5V_Main (Pin4)

5V main power. When this pin is below 4.5V, transition

from S3 to S0 is inhibited.

VTT_SNS (Pin5)

Remote sense for VTT. The pin is applied to remote sense

the output voltage of VTT.

VTT_OUT (Pin6)

Output of VTT. Regulator power VTT output.

VDDQ_IN (Pin7)

Input of external VDDQ. Input power of VTT, the VTT is

implemented to tracking 1/2 VDDQ.

BOOT (Pin8)

PWM Boot. The pin is applied for VDDQ PWM boot-

strapped power for the embedded driver power.

UGATE (Pin9)

High-Side Drive. High-side MOSFET driver output of VDDQ

PWM. Connect to gate of high-side MOSFET.

Soft-Start

and

Control

Circuit

Gate

Control

UVL

Oscillator

PGOOD

VDD

VCC

VTT_SNS

FB1.2

BOOT

UGATE

LGATE

PHASE

ISNS

GND

VDDQ_IN

VTT_OT

VTT_SNS

REF_IN

ILIM

3VSB_OUT

1.2V_FB

1.2V_DRV

PGOOD

VCC

VCC_EN

5V_MAIN

S3#I

5VSB_DRV

COMP

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