General Description

The RT9527 is a low cost single-cell Li-ion charger for low current charge applications. The RT9527 can be powered up from an AC adapter or USB (Universal Serial Bus) port inputs. The RT9527 enters sleep mode when VIN power is removed. The RT9527 optimizes the charging task by using a control algorithm, which includes pre-charge mode, fast-charge mode and constant voltage mode. The charging task is kept in constant voltage mode to hold the battery in a full charge condition. The charge current is adjustable via an external resistor. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The RT9527 features 28V maximum rating voltages for VIN. Other features include under voltage protection and over voltage protection for the AC adapter supply. The RT9527 is available in a WDFN-8L 2x2 package.

Features

28V Maximum Rating for AC Adapter

Internal Integrated Power FETs

Adjustable Charging Current

Programmable Safe Charge Timer

NTC Thermistor Input

Battery Reverse Protection

ISET Pin Short Protection

Charge Status Indicator

AC Adapter Power Good Status Indicator

End of Charge Current is 10% of Fast-Charge Current

Under Voltage Protection

Over Voltage Protection

Thermal Feedback Optimized Charge Rate

Small Thermally Enhanced 8-Lead WDFN Package

RoHS Compliant and Halogen Free