RT9237CS datasheet(6/15 Pages) ETC

6 / 15 page

RT9237

Preliminary

www.richtek-ic.com.tw

DS9237-00 January 2002

Functional Pin Description

VID4, VID3, VID2, VID1 and VID0 ( Pin1,2,3,4,5)

DAC voltage identification inputs for VRM9.0. These

pins are TTL-compatible and internally pulled to VDD

if left open.

COMP (Pin 6)

Output of the error amplifier and input of the PWM

comparator.

FB (Pin 7)

Inverting input of the internal error amplifier.

ADJ (Pin 8)

Current sense output for active droop adjust.

Connect a resistor from this pin to GND to set the

amount of load droop.

GND (Pin 9)

Ground for the IC.

VSEN (Pin 10)

Power good and over voltage monitor input. Connect

to the microprocessor-CORE voltage.

IRMP (Pin 11)

PWM ramp amplitude set by external resistor. Ramp

amplitude = 1V

× (R [IRMP] / 56KΩ)

DVD (Pin 12)

Programmable power UVLO detection input. Trip

threshold = 1.25V at V(DVD) rising

IMAX (Pin 13)

Over current protection amplitude set.

SS (Pin 14)

Connect this SS pin to GND with a capacitor to set

the start time interval. Pull this pin below 1V(ramp

valley of saw-tooth wave in pulse width modulator) to

shutdown the converter output.

ISEN1 (Pin 18), ISEN2 (Pin 17), ISEN3 (Pin 16) and

ISEN4 (Pin 15)

Current sense inputs from the individual converter

channel’s sense component GND nodes.

ISP1 (Pin 24), ISEN2 (Pin 21), ISEN3 (Pin 20) and

ISEN4 (Pin 25)

Current sense

inputs for individual

converter

channels. Tie this pin to the component sense node.

PWM1 (Pin 23), PWM2 (Pin 22), PWM3 (Pin 19)

and PWM4 (Pin 26)

PWM outputs for each driven channel. Connect these

pins to the PWM input of the MOSFET driver. For

systems which use 3 channels, connect PWM4 high.

Two channel systems connect PWM3 and PWM4

high.

PGOOD (Pin 27)

Power good open-drain output.

VDD (Pin 28)

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

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