General Description

The APL3207 combines a constant-current/constant-voltage linear single cell Li+ battery charger with a low drop-out linear regulator. Both charger and linear regulators can work independently. The small DFN-10 package and low external component count make the APL3207 ideally suit to portable applications.

The charger of APL3207 provides 0.7A charge current with thermal regulation protection to optimize the board design for compact size and typical thermal conditions. When the junction temperature reaches the thermal regulation threshold, the charger does not shut down but simply reduces the charge current. The charge current can be programmed by connecting an external resistor from the ISET pin to the GND. Using an external MOSFET to disconnect the resistor from the ground shuts down the charger, and reduces the input current down to 25mA. The APL3207 also has the STAT pin to indicate charge status.

The LDO regulator of APL3207 can deliver up to 150mA current and dropout voltage is only 200mV. The 4mA low quiescent current makes it ideally suit to battery-power systems. The LDO regulator also has built-in current limit and thermal shutdown protection.

特性 Features

? Programmable Charge Current Up to 700mA

? Charge Status Output Pin

? Soft-Start Limits Inrush Current

? 4.2V Charge Termination Voltage with ±1 Accuracy

? 45mA Pre-charge Current (RSET=2k)

? Thermal Regulation of Charge Current Simplifies Board Design

? Charger Enable/Disable Control

? Ultra Low Regulator Quiescent Current: 4mA

? Fixed LDO Regulator Output Voltage: 3.3V

? Low Regulator Dropout Voltage: 200mV@150mA

? LDO Regulator Current Limit Protection

? LDO Regulator Short Circuit Current Limit

? LDO Regulator Thermal Protection

? Small 3mmx3mm DFN 10-Pin (DFN-10) Package

? Lead Free and Green Devices Available (RoHS Compliant)

Applications

? PDAs

? MP3 Players

? Cell Phones

? Wireless Appliances