RT9248A datasheet(3/14 Pages) RICHTEK | Multi-Phase PWM Controller for CPU Core Power Supply

3 page

RT9248A

Preliminary

DS9248A-06

March 2006

www.richtek.com

VID4 (Pin 1), VID3 (Pin 2), VID2 (Pin 3), VID1 (Pin 4),

VID0 (Pin 5) & VID125 (Pin 6)

DAC voltage identification inputs. Tie VID125 to GND for

VRM9 or to VCC for VRD10. These pins are internally

pulled to 3.3V if left open.

SGND (Pin 7)

Connect this pin to the return pin of VCORE .

FB (Pin 8)

Inverting input of the internal error amplifier.

COMP (Pin 9)

Output of the error amplifier and input of the PWM

comparator.

PGOOD (Pin 10)

Power good open-drain output.

DVD (Pin 11)

Programmable power UVLO detection or converter enable

input.

SS (Pin 12)

Connect this SS pin to GND with a capacitor to set the

soft-start time interval.

RT (Pin 13)

Switching frequency setting. Connect this pin to GND with

a resistor to set the frequency.

VOSS (Pin 14)

VCORE initial value offset. Connect this pin to GND with a

resistor to set the offset value.

IMAX (Pin 15)

Over-Current protection set.

VSEN (Pin 16)

Power good and over-voltage monitor input. Connect this

to the sense pin of VCORE.

VDIF (Pin 17)

This pin is being tied to VSEN pin internally.

ADJ (Pin 18)

Current sense output for active droop adjust. Connect a

resistor from this pin to GND to set the load droop.

GND (Pin 19)

IC ground.

ISN (Pin 20)

RDS(ON) current sense input from anyone of channel sense

components' GND node.

ISP1 (Pin 23), ISP2 (Pin 22), ISP3 (Pin 21)

RDS(ON) current sense inputs for individual converter

channels. Tie this pin to the component's sense node.

NC (Pin 24)

No internal connection.

PWM1 (Pin 27), PWM2 (Pin 26), PWM3 (Pin 25)

PWM outputs for each driven channel. Connect these pins

to the PWM input of the MOSFET driver. For systems

which use 2 channels, connect PWM3 high.

VCC (Pin 28)

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

Functional Pin Description

Ω)

Frequency vs. RRT

100

150

200

250

300

350

400

450

20304050

6070

RRT

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