ISL62881_14 Datasheet, PDF (1/35 Pages) Intersil Corporation – Single-Phase PWM Regulator for IMVP-6.5 Mobile CPUs and GPUs

Single-Phase PWM Regulator for IMVP-6.5™ Mobile
CPUs and GPUs
ISL62881, ISL62881B
The ISL62881 is a single-phase PWM buck regulator for
miroprocessor or graphics processor core power supply. It uses an
integrated gate driver to provide a complete solution. The PWM
modulator of ISL62881 is based on Intersil's Robust Ripple
Regulator (R³) technology™. Compared with traditional modulators,
the R³â„¢ modulator commands variable switching frequency during
load transients, achieving faster transient response. With the same
modulator, the switching frequency is reduced at light load,
increasing the regulator efficiency.
The ISL62881 can be configured as CPU or graphics Vcore controller
and is fully compliant with IMVP-6.5™ specifications. It responds to
DPRSLPVR signals by entering/exiting diode emulation mode. It
reports the regulator output current through the IMON pin. It senses
the current by using either discrete resistor or inductor DCR
whose variation over-temperature can be thermally
compensated by a single NTC thermistor. It uses differential
remote voltage sensing to accurately regulate the processor die
voltage. The adaptive body diode conduction time reduction
function minimizes the body diode conduction loss in diode
emulation mode. User-selectable overshoot reduction function
offers an option to aggressively reduce the output capacitors as
well as the option to disable it for users concerned about
increased system thermal stress.
Maintaining all the ISL62881 functions, the ISL62881B offers
VR_TT# function for thermal throttling control. It also offers the
split LGATE function to further improve light load efficiency.
Features
• Precision Core Voltage Regulation
- 0.5% System Accuracy Over-Temperature
- Enhanced Load Line Accuracy
• Voltage Identification Input
- 7-Bit VID Input, 0V to 1.500V in 12.5mV Steps
- Supports VID Changes On-The-Fly
• Supports Multiple Current Sensing Methods
- Lossless Inductor DCR Current Sensing
- Precision Resistor Current Sensing
• Superior Noise Immunity and Transient Response
• Current Monitor
• Differential Remote Voltage Sensing
• High Efficiency Across Entire Load Range
• Integrated Gate Driver
• Split LGATE Driver to Increase Light-Load Efficiency (for
ISL62881B)
• Adaptive Body Diode Conduction Time Reduction
• User-selectable Overshoot Reduction Function
• Capable of Disabling the Droop Function
• Audio-filtering for GPU Application
• Small Footprint 28 Ld 4x4 TQFN Package
• Pb-Free (RoHS Compliant)
Applications
• Notebook Computers
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL62881HRTZ
628 81HRTZ
-10 to +100
28 Ld 4x4 TQFN
L28.4x4
ISL62881BHRTZ
62881B HRTZ
-10 to +100
32 Ld 5x5 TQFN
L32.5x5E
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-
free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL62881, ISL62881B. For more information on MSL please see techbrief
TB363.
June 16, 2011
1
FN6924.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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