LTC4012 - High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control

The LTC4012 is a constant-current /constant-voltage battery charger controller. It uses a synchronous quasi-constant frequency PWM control architecture that will not generate audible noise with ceramic bulk capacitors. Charge current is set by external resistors and can be monitored as an output voltage. With no built-in termination, the LTC4012 family charges a wide range of batteries under external control.

The LTC4012 features fully adjustable output voltage, while the LTC4012-1 and LTC4012-2 can be pin-programmed for Lithium-Ion/Polymer battery packs of 1-, 2-, 3- or 4-series cells. The LTC4012-1 provides output voltage of 4.1V/cell and the LTC4012-2 is a 4.2V/cell version.

The device includes AC adapter input current limiting, which maximizes charge rate for a fixed input power level. An external sense resistor programs the input current limit, and the ICL status pin indicates reduced charge current as a result of AC adapter current limiting. Ideal diode control at the adaptor input improves charger efficiency.

The CHRG status pin is active during all charging modes, including special indication for low charge current.

Features
  • General Purpose Battery Charger Controller
  • Efficient 550kHz Synchronous Buck PWM Topology
  • ±0.5% Output Float Voltage Accuracy
  • Programmable Charge Current: 4% Accuracy
  • Programmable AC Adapter Current Limit: 3% Accuracy
  • No Audible Noise with Ceramic Capacitors
  • INFET Low Loss Ideal Diode PowerPath™ Control
  • Wide Input Voltage Range: 6V to 28V
  • Wide Output Voltage Range: 2V to 28V
  • Indicator Outputs for AC Adapter Present, Charging, C/10 Current Detection and Input Current Limiting
  • Analog Charge Current Monitor
  • Micropower Shutdown
  • 20-Pin 4mm × 4mm × 0.75mm QFN Package
Typical Application

Applications
  • Notebook Computers
  • Portable Instruments
  • Battery Backup Systems
Packaging

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC4012CUF-1#PBF4x4 QFN-20C$4.64$3.25
LTC4012CUF-1#TRPBF4x4 QFN-20C$3.31
LTC4012CUF-2#PBF4x4 QFN-20C$4.64$3.25
LTC4012CUF-2#TRPBF4x4 QFN-20C$3.31
LTC4012CUF#PBF4x4 QFN-20C$4.50$3.15
LTC4012CUF#TRPBF4x4 QFN-20C$3.21
LTC4012IUF-1#PBF4x4 QFN-20I$5.64$3.95
LTC4012IUF-1#TRPBF4x4 QFN-20I$4.01
LTC4012IUF-2#PBF4x4 QFN-20I$5.64$3.95
LTC4012IUF-2#TRPBF4x4 QFN-20I$4.01
LTC4012IUF#PBF4x4 QFN-20I$5.43$3.80
LTC4012IUF#TRPBF4x4 QFN-20I$3.86
Demo Boards
Part NumberDescriptionPrice
DC1256ALTC4012CUF-2 Demo Board | Multi-Chemistry, 3A Sync Buck Battery Charger with PowerPath Control$150.00
DC1614ALTC4012CUF Demo Board | Multi-Chemistry 8A Buck Battery Charger with PowerPath Control$150.00
Companion Boards
Part NumberDescriptionPrice
DC1223A-BUSB to SM-Bus/SPI Interface with Monitor$400.00
Datasheet
Reliability Data
Product Selector Card
Press Release
Related Product
LTC4012/ LTC4012-1/LTC4012-2 - High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control
LTC4012 Package Drawing LTC4012
R480 Reliability Data
20V Battery Gas Gauge
采用紧凑型 16mm2 封装的 4A 多节电池/化学电池充电器控制器无需隔离二极管
LTC4012 Footprints and Symbols