isl88731c

Manufacturer Part Numberisl88731c
DescriptionSmbus Level 2 Battery Charger
ManufacturerIntersil Corporation
isl88731c datasheet
 


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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.
13.0
12.5
12.0
VCHG (V)
11.5
11.0
10.5
ICHG (A)
10.0
0
20
40
60
80
100
CHARGE TIME (MINUTES)
FIGURE 1. TYPICAL CHARGING VOLTAGE AND
CURRENT
1
September 9, 2010
FN6978.1
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 +26V Adapter Voltage Range
• Pb-Free (RoHS Compliant)
Applications*
• Notebook Computers
• Tablet PCs
• Portable Equipment with Rechargeable Batteries
Related Literature*
• See
AN1404
Setup Procedure”
3.5
100
3.0
95
2.5
2.0
90
1.5
1.0
85
0.5
80
0.0
120
140
160
0.0
1.0
FIGURE 2. EFFICIENCY vs CHARGE CURRENT AND
BATTERY VOLTAGE
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
|
1-888-INTERSIL or 1-888-468-3774
Intersil (and design) is a registered trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
(see page 24)
(see page 24)
for “ISL88731EVAL2Z Evaluation Board
16.8V BATTERY
12.6V BATTERY
8.4V BATTERY
4.2V BATTERY
2.0
3.0
4.0
5.0
6.0
7.0
I
(A)
OUT
Copyright Intersil Americas Inc. 2010. All Rights Reserved
8.0