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RT9224B

VRM 8.5 Synchronous PWM Buck Converter Controller and Output Voltage Monitor

Richtek Technology 

RT9224B

Preliminary

Pin Description

Pin No. Pin Name Pin Function

1 VSEN

Output voltage monitoring input for OVP and PGOOD

Over current set pin, sinks 200µA through a resistor (ROCS) from this upper N-MOSFET to

set the trip point:

2 OCSET

IPEAK =

200µA × ROCS

MOSFET − on resis tance

An over-current trip cycles the soft-start function

3 SS

Soft start speed is set by internal 10µA current source and capacitor from this pin to GND

4 VID0

Switching Regulator Output Voltage Setting

5 VID1

Switching Regulator Output Voltage Setting

6 VID2

Switching Regulator Output Voltage Setting

7 VID3

Switching Regulator Output Voltage Setting

8 VID25

Switching Regulator Output Voltage Setting

9 NC

No Connection

10 FB

Feedback Input Pin for the PWM Loop

11 GND

IC Signal Ground

Open Drain Logic Output

12 PGOOD This pin is pulled low when the converter output is not within ±10% of the DACOUT

reference voltage

13 PHASE Current Limit Sense Input

14 UGATE High-side Driver Output

15 BOOT

Driver Power

16 PGND

Low-side Driver GND

17 LGATE

Low-side Driver Output

18 VCC

Power Supply Input

19 OVP

Over Voltage Protection

This pin is pulled high when the VSEN voltage is over 15% of the DACOUT reference

voltage

20 NC

No Connection

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4

DS9224B-01 May 2001

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