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LP3947 Datasheet

  • LP3947

  • USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC

  • 14頁(yè)

  • NSC

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LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC
November 2004
LP3947
USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC
General Description
The LP3947 is a complete charge management system that
safely charges and maintains a Li-Ion battery from either
USB power source or AC adaptor. In USB mode, the LP3947
supports charging in low power or high power mode. Alter-
natively, the LP3947 can take charge from AC adaptor. In
both USB and AC adaptor modes, charge current, battery
regulation voltage, and End of Charge (EOC) point can be
selected via I
2
C interface. The LP3947 can also operate on
default values that are pre-programmed in the factory. The
battery temperature is monitored continuously at the Ts pin
to safeguard against hazardous charging conditions. The
charger also has under-voltage and over-voltage protection
as well as an internal 5.6 hr timer to protect the battery. The
pass transistor and charge current sensing resistor are all
integrated inside the LP3947.
The LP3947 operates in four modes: pre-qualification, con-
stant current, constant voltage and maintenance modes.
There are two open drain outputs for status indication. An
internal amplifier readily converts the charge current into a
voltage. Also, the charger can operate in an LDO mode
providing a maximum of 1.2 Amp to the load.
n
n
n
n
n
n
n
n
Near-Depleted Battery Preconditioning
Monitors Battery Temperature
Built-In 5.6 hour timer
Under Voltage and Over Voltage Lockout
Charge Status Indicators
Charge Current Monitor Analog Output
LDO Mode Operation can source 1 Amp
Continuous Over Current/Temperature Protection
Key Specifications
n
1% Charger Voltage Accuracy Over 0藲C
鈮?/div>
T
J
鈮?/div>
85藲C
n
4.3V to 6.0V Input Voltage Range
n
100 mA to 750 mA charge current range, in charger
mode
n
100mA to 500mA charge current range, in USB mode
n
LLP Package Power Dissipation: 2.7W at T
A
= 25藲C
Applications
n
n
n
n
n
Cellular Phones
PDAs
Digital Cameras
USB Powered Devices
Programmable Current Sources
Features
n
Supports USB Charging Scheme
n
Integrated Pass Transistor
Typical Application Circuit
20111001
More Application Circuit can be found in the Application Note section.
漏 2004 National Semiconductor Corporation
DS201110
www.national.com

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