1

®

FN6738.1

ISL88731A

SMBus Level 2 Battery Charger

The ISL88731A is a highly integrated Lithium-ion battery

charger controller, programmable over the SMBus system

management bus (SMBus). The ISL88731A is intended to be

used in a smart battery charger (SBC) within a smart battery

system (SBS) that throttles the charge power such that the

current from the AC-adapter is automatically limited. High

efficiency is achieved with a DC/DC synchronous-rectifier

buck converter, equipped with diode emulation for enhanced

light load efficiency and system bus boosting prevention. The

ISL88731A charges one to four Lithium-ion series cells, and

delivers up to 8A charge current. Integrated MOSFET

drivers and bootstrap diode result in fewer components and

smaller implementation area. Low offset current-sense

amplifiers provide high accuracy with 10m

Ω sense resistors.

The ISL88731A provides 0.5% end-of-charge battery

voltage accuracy.

The ISL88731A provides a digital output that indicates the

presence of the AC-adapter as well as an analog output

which indicates the adapter current within 4% accuracy.

The ISL88731A is available in a small 5mmx5mm 28 Ld thin

(0.8mm) QFN package. An evaluation kit is available to

reduce design time. The ISL88731A is available in Pb-Free

packages.

Pinout

ISL88731A

(28 LD TQFN)

TOP VIEW

Features

• 0.5% Battery Voltage Accuracy

• 3% Adapter Current Limit Accuracy

• 3% Charge Current Accuracy

• SMBus 2 Wire Serial Interface

• Battery Short Circuit Protection

• Fast Response for Pulse-Charging

• Fast System-Load Transient Response

• Monitor Outputs

- Adapter Current (3% Accuracy)

- AC-Adapter Detection

• 11-Bit Battery Voltage Setting

• 6 Bit Charge Current/Adapter Current Setting

• 8A Maximum Battery Charger Current

• 11A Maximum Adapter Current

• +8V to +28V Adapter Voltage Range

• Pb-Free (RoHS compliant)

Applications

• Notebook Computers

• Tablet PCs

• Portable Equipment with Rechargeable Batteries

NC

ACIN

VREF

ICOMP

NC

VCOMP

NC

VDDP

LGATE

PGND

CSOP

CSON

NC

VFB

1

2

3

4

5

6

7

21

20

19

18

17

16

15

28

27

26

25

24

23

22

8

9

10

11

12

13

14

Ordering Information

PART

NUMBER

(Note)

PART

MARKING

TEMP

RANGE

(°C)

PACKAGE

(Pb-Free)

PKG.

DWG. #

ISL88731AHRZ

ISL887

31AHRZ

-10 to +100 28 Ld 5x5

TQFN

L28.5x5B

ISL88731AHRZ-T* ISL887

31AHRZ

-10 to +100 28 Ld 5x5

TQFN (Tape

and Reel)

L28.5x5B

*Please refer to TB347 for details on reel specifications.

NOTE: 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.

Data Sheet

January 7, 2009

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

1-888-INTERSIL or 1-888-468-3774

Copyright Intersil Americas Inc. 2008, 2009. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.