ISL6263A Datasheet, PDF (1/19 Pages) Intersil Corporation – 5-Bit VID Single-Phase Voltage Regulator with Power Monitor for IMVP-6+ Santa Rosa GPU Core

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Data Sheet
July 8, 2010
ISL6263A
FN9284.3
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
Regulator (R³) Technology™. The ISL6263A is an
implementation of the Intel^® Mobile Voltage Positioning
(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.
Intersil’s R³ Technology™ combines the best features of
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
RBIAS 1
32 31
30 29 28 27
26 25
24 VID1
SOFT 2
23 VID0
OCSET 3
22 PVCC
VW 4
COMP 5
THERMAL PAD
(BOTTOM)
21 LGATE
20 PGND
FB 6
19 PHASE
VDIFF 7
18 UGATE
VSEN 8
17 BOOT
9 10 11 12 13 14 15 16
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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