CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305

Preliminary Datasheet
1
Sep. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited

General Description
The AP4305 is a highly integrated solution for a con-
stant voltage/constant current mode SMPS application.
The AP4305 contains one 1.21V voltage reference
with ± 0.5% accuracy, one current sensing circuit and
two operational amplifiers. Combining the voltage ref-
erence with one operational amplifier makes AP4305
an ideal voltage controller for use in adapters and bat-
tery chargers. The other low voltage reference com-
bined with the other operational amplifier makes it an
ideal current limiter for output low side current sens-
ing.
The AP4305 is available in SOT-23-6 package.
Features
·Constant Voltage and Constant Current Control
·Precision Internal Voltage Reference
·Few External Components
·Easy Compensation
Applications
·Adapters
·Battery Chargers
Figure 1. Package Type of AP4305
SOT-23-6