isl88731c Intersil Corporation, isl88731c Datasheet

isl88731c

Manufacturer Part Number

isl88731c

Description

Smbus Level 2 Battery Charger

Manufacturer

Intersil Corporation

Datasheet

1.ISL88731C.pdf (25 pages)

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SMBus Level 2 Battery Charger

ISL88731C

The ISL88731C is a highly integrated Lithium-ion

battery charger controller, programmable over the

SMBus system management bus (SMBus). The

ISL88731C 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 ISL88731C 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 10mΩ sense

resistors. The ISL88731C provides 0.5% end-of-charge

battery voltage accuracy.

The ISL88731C 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 ISL88731C is available in a small 5mmx5mm

28 Ld Thin (0.8mm) QFN package. An evaluation kit is

available to reduce design time. The ISL88731C is

available in Pb-Free packages.

September 9, 2010

FN6978.1

FIGURE 1. TYPICAL CHARGING VOLTAGE AND

13.0

12.5

12.0

11.5

11.0

10.5

10.0

CURRENT

CHARGE TIME (MINUTES)

ICHG (A)

100

VCHG (V)

120

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

140

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

160

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

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

• 11-Bit Battery Voltage Setting

• 6 Bit Charge Current/Adapter Current Setting

• 8A Maximum Battery Charger Current

• 11A Maximum Adapter Current

• +8V to +26V Adapter Voltage Range

• Pb-Free (RoHS Compliant)

Applications*

• Notebook Computers

• Tablet PCs

• Portable Equipment with Rechargeable Batteries

Related Literature*

• See

FIGURE 2. EFFICIENCY vs CHARGE CURRENT AND

- Adapter Current (3% Accuracy)

- AC-Adapter Detection

Setup Procedure”

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

100

Intersil (and design) is a registered trademark of Intersil Americas Inc.

0.0

AN1404

1.0

BATTERY VOLTAGE

for “ISL88731EVAL2Z Evaluation Board

2.0

4.2V BATTERY

8.4V BATTERY

12.6V BATTERY

3.0

(see page 24)

16.8V BATTERY

OUT

4.0

(A)

(see page 24)

5.0

6.0

7.0

8.0

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