ISL9205

Li-ion Battery Charger

Product Status: Mass Production

OVERVIEW

The ISL9205, ISL9205A, ISL9205B, ISL9205C, and ISL9205D are integrated single-cell Li-ion or Li-polymer chargers capable of operating at an input voltage as low as 2.5V. The low operating voltage allows the charger to work with a variety of AC adapters.

The ISL9205 family operates as a linear charger when the AC adapter is a voltage source. The battery is charged in a standard Li-ion charge profile, that is, a Constant Current phase followed by a Constant Voltage phase (CC/CV). The charge current during the Constant Current phase is determined by the external resistor connected to the IREF pin. When the adapter output is a current-limited voltage source and the current limit is smaller than the programmed constant current of the IC, the ISL9205 operates as a pulse charger where the charge current is determined by the current limit of the AC adapter during the Constant Current phase. The ISL9205 operates in a linear mode during the constant voltage phase in both adapter cases.

The ISL9205 family incorporates Thermaguard, which protects the IC against over-temperature. If the die temperature rises above a typical value of +100°C, the thermal foldback function reduces the charge current to prevent further temperature rise. The ISL9205 includes an external temperature monitoring function (not available in some package options). A Negative Temperature Coefficient (NTC) thermistor is connected between the TEMP pin and GND to monitor the battery or ambient temperature. The ISL9205 also includes a timer to set the time reference for various charge time limits. The timer is programmable with an external capacitor. Two logic inputs and two open-drain logic outputs are available for controlling the charger and indicating the charger status. The EN pin enables the charger. The TOEN pin (available in the ISL9205) enables the timeout function so that the charge is terminated when the preset time limits have been reached. The FAULT pin is an open-drain output that turns on when a fault condition is encountered. The STATUS pin is also an open-drain output that turns on when the charger is delivering current.

KEY FEATURES

    • Complete charger for single-cell Li-ion/polymer batteries
    • Integrated pass element and current sensor
    • No external blocking diode required
    • Low component count and cost
    • 25mV voltage accuracy over-temperature and input voltage range
    • 15mV voltage accuracy at room temperature
    • Programmable charge current
    • Programmable end-of-charge current (ISL9205)
    • Charge current thermal foldback for thermal protection (Thermaguard)
    • Trickle charge for fully discharged batteries
    • Power presence and charge indications
    • NTC interface (not available in some package options)
    • Less than 3μA leakage current off the battery when no input power attached or charger disabled
    • Ambient temperature range: -40°C to +85°C
    • DFN, QFN packages
    • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL9205
Basic Information
生产状态
Mass Production
输出电压典型值 (V)
4.2
电压精度 (%)
0.6
VIN1 (最大值) (V)
7
输出电流1最大值 (A)
1
安全定时器
Yes
自终止
Yes
接受CC适配器
Yes
VIN1涓流充电 (最小值) (% CC)
10
热调节
Yes
功能
Enable, Timeout Disable, Charge Indication, Fault, NTC, IREF Set, IMIN Set, Time Set
电池化学物品
Single Cell Li+/Polymer
资质级别
Standard
CAN 采样
YES
温度范围
-40 to +85

Action Needed