ISL6255

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

Product Status: Mass Production

OVERVIEW

The ISL6255 and ISL6255A are highly integrated battery charger controllers 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 ISL6255 and ISL6255A provide outputs that are used to monitor the current drawn from the AC adapter, and monitor for the presence of an AC adapter. The ISL6255 and ISL6255A automatically transition from regulating current mode to regulating voltage mode.

ISL6255 and ISL6255A have 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 (-10oC to +100oC)
  • ±3% Accurate Input Current Limit
  • ±3% Accurate Battery Charge Current Limit
  • ±25% Accurate Battery Trickle Charge Current Limit (ISL6255A)
  • Programmable Charge Current Limit, Adapter Current Limit and Charge Voltage
  • Fixed 300kHz PWM Synchronous Buck Controller with Diode Emulation at Light Load
  • 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
  • Support Pulse Charging
  • Charge Any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.
  • Pb-Free Plus Anneal Available (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6255
Basic Information
生产状态
Mass Production
输入电压最小值 (V)
7
输入电压最大值 (V)
25
输入限流精度 (%)
±3
电池充电电压 (V)
4.2/Cell (2S, 3S, 4S)
充电电压精度最大值 (%)
±0.5
电池充电电压调节 (%)
±5/Cell
充电限流精度 (%)
±5 (CHLIM=2.0V)
涓流充电限流精度 (%)
±50 (CHLIM=0.2V)
自动涓流充电典型值 (V)
No (Set by Host)
电池泄漏电流最大值 (μA)
10 (DCIN=0V, No System Load)
自动电源选择
Yes
直流适配器检测
Yes
拓扑
Fixed Frequency Synchronous Buck
开关频率典型值 (kHz)
300
最大占空比 (%)
99.9
听觉噪音
No
热关断 (°C)
150 °C
电池化学物品
Multi-Cell Li+/Polymer
资质级别
Standard
输入电压范围 (V)
7 to 25
温度范围
-10 to +100

Action Needed