RT8800BGS datasheet(2/26 Pages) RICHTEK

2 / 26 page

RT8800/B

DS8800/B-06 March 2007

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Pin Configurations

(TOP VIEW)

VQFN-16L 3x3

RT8800

SOP-16

RT8800B

Functional Pin Description

DACFB

Negative input of internal buffer amplifier for reference

voltage regulation. The pin voltage is locked at internal

VREF = 0.8V by properly close the buffer amplifier feedback

loop.

DACQ

The pin is defined as the output of internal buffer amplifier

for reference voltage regulation.

The pin is defined as the inverting input of internal error

amplifier.

DVD

The pin is defined as a programmable power UVLO

detection input. Trip threshold = 0.8V at VDVD rising.

COMP

The pin is defined as the output of the error amplifier and

the input of all PWM comparators.

The pin is defined as the positive input of the error amplifier.

Switching frequency setting. Connect this pin to GND with

a resistor to set the frequency.

ICOMMON

Common negative input of current sense amplifiers for all

three channels.

PGOOD

Output power-good indication. The signal is implemented

as an output signal with open-drain type.

ISP1 , ISP2 , ISP3

Current sense positive inputs for individual converter

channel current sense.

PWM1 , PWM2 , PWM3

PWM outputs for each phase switching drive.

VDD

Chip power supply. Connect this pin to a 5V supply.

GND

Chip power ground.

Exposed Pad (RT8800)

Exposed pad should be soldered to PCB board and

connected to GND.

DACFB

ISP1

PGOOD

ISP3

ISP2

DVD

DACQ

GND

VDD

DACFB

DACQ

DVD

COMP

ICOMMON

GND

PGOOD

ISP

N/C

PWM1

PWM2

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