ISL6256

Highly Integrated Battery Charger with Automatic Power Source Selector for Notebook Computers

Product Status: Mass Production

OVERVIEW

The ISL6256, ISL6256A is a highly integrated battery charger controller for Li-Ion/Li-Ion polymer batteries. High Efficiency is achieved by a synchronous buck topology and the use of a MOSFET, instead of a diode, for selecting power from the adapter or battery. The low side MOSFET emulates a diode at light loads to improve the light load efficiency and prevent system bus boosting.

The constant output voltage can be selected for 2, 3 and 4 series Li-Ion cells with 0.5% accuracy over-temperature. It can also be programmed between 4.2V+5%/cell and 4.2V- 5%/cell to optimize battery capacity. When supplying the load and battery charger simultaneously, the input current limit for the AC adapter is programmable to within 3% accuracy to avoid overloading the AC adapter, and to allow the system to make efficient use of available adapter power for charging. It also has a wide range of programmable charging current. The ISL6256, ISL6256A provides outputs that are used to monitor the current drawn from the AC adapter, and monitor for the presence of an AC adapter. The ISL6256, ISL6256A automatically transitions from regulating current mode to regulating voltage mode.

ISL6256, ISL6256A has a feature for automatic power source selection by switching to the battery when the AC adapter is removed or switching to the AC adapter when the AC adapter is available. It also provides a DC adapter monitor to support aircraft power applications with the option of no battery charging.

KEY FEATURES

  • ±0.5% Charge Voltage Accuracy (-10°C to +100°C)
  • ±3% Accurate Input Current Limit
  • ±3% Accurate Battery Charge Current Limit
  • ±25% Accurate Battery Trickle Charge Current Limit
  • Programmable Charge Current Limit, Adapter Current Limit and Charge Voltage
  • Fixed 300kHz PWM Synchronous Buck Controller with Diode Emulation at Light Load
  • Overvoltage Protection
  • Output for Current Drawn from AC Adapter
  • AC Adapter Present Indicator
  • Fast Input Current Limit Response
  • Input Voltage Range 7V to 25V
  • Support 2-, 3- and 4-Cells Battery Pack
  • Up to 17.64V Battery-Voltage Set Point
  • Control Adapter Power Source Select MOSFET
  • Thermal Shutdown
  • Aircraft Power Capable
  • DC Adapter Present Indicator
  • Battery Discharge MOSFET Control
  • Less than 10µA Battery Leakage Current
  • Supports Pulse Charging
  • Pb-Free (RoHS Compliant)

PARAMETRICS

Parameters
ISL6256
Basic Information
Production Status
Mass Production
Input Voltage Min (V)
7
Input Voltage Max (V)
25
Input Current Limit Accuracy (%)
±3
Battery Charge Voltage (V)
4.2/Cell (2S, 3S, 4S)
Charging Voltage Accuracy Max (%)
±0.5
Battery Charge Voltage Adjust (%)
±5/Cell
Charge Current Limit Accuracy (%)
±3 (CHLIM=2.0V)
Trickle Charge Current Limit Accuracy (%)
±25 (CHLIM=0.2V)
Automatic Trickle Charge Typ (V)
No (Set by Host)
Battery Leakage Current Max (μA)
10 (DCIN=0V, No System Load)
Automatic Power Source Selection
Yes
DC Adapter Detection
Yes
Topology
Fixed Frequency Synchronous Buck
Switching Frequency Typ (kHz)
300
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)
7 to 25
Temperature Range
-10 to +100

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