ISL6263 Datasheet, PDF (1/19 Pages) Intersil Corporation – 5-Bit VID Single-Phase Voltage Regulator for IMVP-6+ Santa Rosa GPU Core

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Data Sheet
June 10, 2010
ISL6263
FN9213.2
5-Bit VID Single-Phase Voltage Regulator
for IMVP-6+ Santa Rosa GPU Core
The ISL6263 IC is a Single-Phase Synchronous-Buck PWM
voltage regulator featuring Intersil’s Robust Ripple Regulator
(R³) Technology™. The ISL6263 is an implementation of the
Intel^® Mobile Voltage Positioning (IMVP) protocol for GPU
Render Engine core power. Integrated MOSFET drivers,
bootstrap diode, and droop amplifier result in lower
component cost and smaller implementation area.
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.
To maximize light load efficiency, the ISL6263 automatically
transitions between continuous-conduction-mode (CCM)
and discontinuous-conduction-mode (DCM.) During DCM
the low-side MOSFET enters diode-emulation-mode (DEM.)
DEM is enabled whenever a Render Suspend state has
been set on the VID inputs. Optionally, DEM can be enabled
for all VID states by setting the FDE pin high. The ISL6263
has an audio filter that can be enabled in any Render
Suspend state by pulling the AF_EN pin high. The audio
filter prevents the PWM switching frequency from entering
the audible spectrum due to 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
ISL6263 uses the same capacitor for the soft-start slew-rate
and for 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
• 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
• Selectable diode emulation mode
- Render Suspend mode only
- Render Performance and Render Suspend mode
• Selectable audio filter in render suspend mode
• 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 plus anneal available (RoHS compliant)
Pinout
ISL6263 (32 LD 5x5 QFN)
TOP VIEW
32 31 30 29 28 27 26 25
RBIAS 1
24 VID1
SOFT 2
23 VID0
OCSET 3
22 PVCC
VW 4
COMP 5
GND 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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