RT8800 데이터 시트보기 (PDF) - Richtek Technology

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RT8800

General Purpose 2/3-Phase PWM Controller for High-Density Power Supply

Richtek Technology 

RT8800/B

Pin Configurations

(TOP VIEW)

16 15 14 13

DACFB 1

DACQ 2

FB 3

DVD 4

GND

12 ISP1

11 ISP2

10 ISP3

9 PGOOD

5678

VQFN-16L 3x3

RT8800

VDD

DACFB 2

DACQ 3

FB

4

DVD

5

COMP 6

PI

7

RT

8

16 PWM2

15

PWM1

14 N/C

13

ISP1

12

ISP2

11 PGOOD

10

GND

9

ICOMMON

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.

FB

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.

PI

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

RT

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.

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2

All brand name or trademark belong to their owner respectively

DS8800/B-06 March 2007

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