KX4057A6SOT23-6高耐压30V充电管理芯片4.2V4.35V600mA电流

1 Features
 Constant-Current/Constant-Voltage Operation
with Thermal Regulation to Maximize Charge
Rate Without Risk of Overheating
 Continuous Programmable Charge Current Up
to 600mA
 No MOSFET, Sense Resistor or Blocking Diode
Required
 Preset 4.2V/4.35V/4.05V Charge Voltage with
±1% Accuracy
 Charge Status Output Pin
 Battery Temperature Sensing
 C/10 Charge Termination
 2.9V Trickle Charge Threshold
 50μA Supply Current in Shutdown mode
 Automatic Recharge
2 Applications
 MP3 /MP4 Players
 Wireless handsets
 USB charge applications
 Charging docks, charging cradles
3 Description
The KX4057A6 is a complete constant-current /
constant-voltage linear charger for single cell
lithium rechargeable battery. No external sense
resistor is needed, and no blocking diode is
required due to the internal P-MOSFET
architecture. Furthermore, the KX4057A6 is
specifically designed to work within USB power
specifications. It’s package and low external
component count make the KX4057A6 ideally
suited for portable applications. An internal
block regulates the current when the junction
temperature increases, in order to protect the
device when it operates in high power or high
ambient temperature. The charge voltage is
fixed at 4.2V/4.35V/4.05V, and the charge
current can be programmed externally with a
single resistor. The KX4057A6 automatically
terminates the charge cycle when the charge
current drops to 1/10th the programmed value
after the final float voltage is reached. When the
input supply (wall adapter or USB supply) is
removed, the KX4057A6 automatically enters a
low power sleep mode, dropping the battery
drain current to less than 2μA.