ISL88733

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SMBus Level 2 Battery Charger

OVERVIEW

The ISL88733 is a highly integrated Lithium-ion battery charger controller, programmable over the SMBus system management bus (SMBus). The ISL88733 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. The ISL88733 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 ISL88733 provides 0.5% end-of-charge battery voltage accuracy.

The ISL88733 is available in a small 5mmx5mm 28 Ld Thin (0.8mm) QFN package.

KEY FEATURES

  • Pin compatible with ISL88731
  • Over-temp and overcurrent protection
  • 0.5% battery voltage accuracy
  • 4% adapter current limit accuracy
  • 3% charge current accuracy
  • SMBus 2-wire serial interface
  • Charge current limited by SMBus DAC OR analog voltage at the CCLIM pin
  • Monitor outputs
  • Adapter current (3% Accuracy)
  • Adapter overcurrent ALERT#. Threshold set by resistor divider
  • 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)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL88733
Basic Information
Production Status
Mass Production
Input Voltage Min (V)
8
Input Voltage Max (V)
22
Input Current Limit Accuracy (%)
±4
Battery Charge Voltage (V)
1.024 to 19.2 in 16mV Steps
Charging Voltage Accuracy Max (%)
±0.5
Battery Charge Voltage Adjust (%)
16mV steps
Charge Current Limit Accuracy (%)
±3
Trickle Charge Current Limit Accuracy (%)
64mA to 220mA
Automatic Trickle Charge Typ (V)
2.7
Battery Leakage Current Max (μA)
2 (DCIN=0V, No System Load)
Automatic Power Source Selection
No (Set by Host)
DC Adapter Detection
No (Set by Host)
Topology
Fixed Frequency Synchronous Buck
Switching Frequency Typ (kHz)
400
Max Duty Cycle (%)
99.6
Audible Noise
No
Thermal Shutdown (°C)
150 °C
Battery Chemistry
Multi-Cell Li+/Polymer
Qualification Level
Standard
Input Voltage Range (V)
8 to 22
Can Sample
YES
Temperature Range
-10 to +100

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