ISL95871C Datasheet, PDF (1/25 Pages) Intersil Corporation – SMBus Interfaced Battery Charger with Internal FETs

SMBus Interfaced Battery Charger with Internal FETs
ISL95871C
The ISL95871C is a highly integrated Lithium-ion
battery charger controller, programmable over the
System Management Bus (SMBus) with internal
switching FETs. 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 ISL95871C
charges one to four Lithium-ion series cells, and delivers
up to 8A charge current. Integrated MOSFETs and
bootstrap diode result in fewer components and smaller
implementation area. Low offset current-sense amplifiers
provide high accuracy with 10mΩ sense resistors. The
ISL95871C provides 0.5% battery voltage accuracy.
The ISL95871C also 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.
Applications
• Notebook Computers
• Tablet PCs
• Portable Equipment with Rechargeable Batteries
Features
• Internal Synchronous Buck Output Stage Power FETs
• 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 +22V Adapter Voltage Range
• Pb-Free (RoHS Compliant)
Related Literature
• See AN1590, ISL95871C Evaluation Board User
Guide
100
95
90
85
4 CELL
3 CELL
80
2 CELL
75
1 CELL
70
65
60 ₀
1
2
3
4
5
6
7
8
CHARGE CURRENT (A)
FIGURE 1. EFFICIENCY vs CHARGE CURRENT AND
BATTERY VOLTAGE (EFFICIENCY
DCIN = 20V)
9
8
7
6
5
4 CELL
4
3 CELL
3
2 CELL
2
1 CELL
1
0
0
25
50
75
100 125 150
AMBIENT TEMPERATURE (°C)
FIGURE 2. DERATING CURVE WITH NATURAL AIR
FLOW (MEASURED ON 10cm x 10cm
EVALUATION BOARD)
September 29, 2010
FN6856.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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