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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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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 drivers to provide a complete

solution. The PWM modulator of ISL62881 is based on

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

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

February 25, 2010

FN6924.1