1

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FN9284.3

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ISL6263A

5-Bit VID Single-Phase Voltage Regulator

with Power Monitor for IMVP-6+ Santa

Rosa GPU Core

The ISL6263A IC is a Single-Phase Synchronous-Buck

PWM voltage regulator featuring Intersil’s Robust Ripple

(IMVP) protocol for GPU Render Engine core power.

Integrated power monitor, droop amplifier, MOSFET drivers,

and bootstrap diode result in smaller implementation area and

lower component cost.

both fixed-frequency PWM and hysteretic PWM, delivering

excellent light-load efficiency and superior load transient

response by commanding variable switching frequency

during the transitory event. For maximum conversion

efficiency, the ISL6263A automatically enters diode

emulation mode (DEM) should the inductor current attempt

to flow negative. DEM is highly configurable and easy to

setup. A PWM filter can be enabled that prevents the

switching frequency from entering the audible spectrum as a

result of extremely light load while in DEM.

The Render core voltage can be dynamically programmed

from 0.41200V to 1.28750V by the five VID input pins

without requiring sequential stepping of the VID states. The

ISL6263A requires only one capacitor for both the soft-start

slew-rate and the dynamic VID slew-rate by internally

connecting the SOFT pin to the appropriate current source.

Processor socket Kelvin sensing is accomplished with an

integrated unity-gain true differential amplifier.

Features

• Precision Single-phase Core Voltage Regulator

- 0.5% System Accuracy 0°C to +100°C

- Differential Remote GPU Die Voltage Sensing

- Differential Droop Voltage Sensing

• Real-time GPU Power Monitor Output

• Applications Up to 25A

• Input Voltage Range: +5.0V to +25.0V

• Programmable PWM Frequency: 200kHz to 500kHz

• Pre-biased Output Start-up Capability

• 5-bit Voltage Identification Input (VID)

- 1.28750 to 0.41200V

- 25.75mV Steps

- Sequential or Non-sequential VID Change On-the-fly

• Configurable PWM Modes

- Forced Continuous Conduction Mode

- Automatic Entry and Exit of Diode Emulation Mode

- Selectable Audible Frequency PWM Filter

• Integrated MOSFET Drivers and Bootstrap Diode

• Choice of Current Sensing Schemes

- Lossless inductor DCR Current Sensing

- Precision Resistive Current Sensing

• Overvoltage, Undervoltage, and Overcurrent Protection

• Pb-free (RoHS compliant)

Pinout

ISL6263A (32 LD 5x5 QFN)

TOP VIEW

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

32

31

30

29

28

27

26

25

910

11

12

13

14

15

16

THERMAL PAD

(BOTTOM)

RBIAS

VSEN

VDIFF

FB

COMP

VW

OCSET

SOFT

VID1

VID0

PVCC

LGATE

PGND

PHASE

UGATE

BOOT

Data Sheet

July 8, 2010