LTC4012/
LTC4012-1/LTC4012-2
High Efficiency,
Multi-Chemistry Battery Charger
with PowerPath Control
Description 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
n INFET Low Loss Ideal Diode PowerPath™ Control
n Wide Input Voltage Range: 6V to 28V
n Wide Output Voltage Range: 2V to 28V
n Indicator Outputs for AC Adapter Present, Charging,
C/10 Current Detection and Input Current Limiting
n Analog Charge Current Monitor
n Micropower Shutdow 20-Pin 4mm × 4mm × 0.75mm QFN Package n n n n Applications Notebook Computers Portable Instruments
n Battery Backup Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 5723970. The LTC4012 is a constant-current /constant-voltage battery charger controller. It uses a synchronous
quasi-constant frequency PWM control architecture …