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4A Multi-Cell, Multi-Chemistry Battery Charger Controller in Compact 16mm2 Package

Linear Technology Corporation introduces the LTC4009, a fast-charge 4A capable, high efficiency switchmode battery charger controller for multiple battery chemistries which minimizes power dissipation without compromising board space.


The LTC4009 supports Li-Ion/Polymer, NiMH, NiCd and sealed lead acid battery chemistries in multi-cell configurations. AC adapter current limiting maximizes the charge rate for a given fixed input power level, allowing the end product to operate at the same time the battery is charging without complex load management algorithms. The IC operates from input voltages up to 28V and is intended for applications including portable computers, portable instruments, and battery backup systems.

The LTC4009's synchronously rectified, buck switching topology drives all n-channel MOSFETs and enables efficiencies as high as 90% at 4A. Final float voltage accuracy is specified at ±0.5% and charge current is programmable with accuracy of ±4%. The LTC4009's quasi-constant frequency PWM architecture guarantees no audible noise operation and minimizes filtering needs, while the high operating frequency of 550kHz allows the use of small inductors and capacitors.


Summary of Features: LTC4009
High Efficiency PWM Switchmode Battery Charger
Multiple Battery Chemistries & Multi-Cell Configurations
         •Li-Ion/Polymer, NiMH, NiCd, SLA
Charge Current up to 4A
550kHz Switching Frequency Enables Small External
±0.5% Output Float Voltage Accuracy
Programmable Charge Current: ±4% Accuracy
No Audible Noise with Ceramic Capacitors
Synchronous Rectification: High Efficiency up to 92% @ 2A
Enhanced Non-Overlap Control of External Power FETs
Wide Input Supply Voltage Range: 6V to 28V
Wide Output Battery Voltage Range: 3V to 28V
Indicator Outputs for AC Adapter Present, Charging, C/10
Current Detection and Input Current Limiting
Analog Charge Current Monitor
Micropower Shutdown
Compact, Low-Profile (0.75mm) 4mm x 4mm QFN-20


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