ISL95871C_11 Datasheet, PDF (1/26 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
1 CELL
4
3 CELL
3
2 CELL
2
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)
June 8, 2011
1
FN6856.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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