The KF5420A is a highly The KF5420A is a highly constant-current/ constant voltage linear charger for cell lithium-ion batteries. Its package and low external component count make the KF5420A ideally suited for portable applications. The charge current can be programmed externally with a single resistor, which may be programmed
up to 1A. KF5420A determines the charge mode by detecting the battery voltage: Pre-charge, constant current charging， constant voltage charging. The charge current of Opre-charging and constant - current charging is adjustable. The KF5420A is monitored by temperature monitor during the constant-current and constant-voltage charging. There are two LEDs indicate the charge mode.
The KF5420A is available in the SOP-8L package.
Features
Preset 8.4V Charge Voltage with 1% Accuracy
Programmable Charge CurrentUp to 1A
Input Voltage:9-10V DC
Pre-Charging, the Charge Current is adjustable
Ideal for Dual-Cell (8.4V) Li-lon Batteries
Constant -Current Charging, the Charge
Current is adjustable
Constant-Voltage Charging
Constant-Current/Constant-Voltage
Charging with Temperature Monitoring
Automatic Recharge
Double LEDs Charge Status Indication
Available in SOP-8L Package
Application
Charger for Li-lon Coin Cell Batteries
Bluetooth Applications
Portable MP3 Players, Wireless Headsets