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FULL DATA SHEET (PDF, 368kB) Download   E-Mail The MAX1645B is a high-efficiency battery charger capable of charging batteries of any chemistry type. It uses the Intel System Management Bus (SMBus™) to control voltage and current-charge outputs. When charging lithium-ion (Li+) batteries, the MAX1645B automatically transitions from regulating current to regulating voltage. The MAX1645B can also limit line input current so as not to exceed a predetermined current drawn from the DC source. A 175s charge safety timer prevents "runaway charging" should the MAX1645B stop receiving charging voltage/current commands. The MAX1645B employs a next-generation synchronous buck control circuitry that lowers the minimum input-to-output voltage drop by allowing the duty cycle to exceed 99%. The MAX1645B can easily charge one to four series Li+ cells.

Key Features		Applications/Uses
Input Current Limiting 175s Charge Safety Timeout 128mA Wake-Up Charge Charges Any Chemistry Battery: Li+, NiCd, NiMH, Lead Acid, etc. Intel SMBus 2-Wire Serial Interface Compliant with Level 2 Smart Battery Charger Spec Rev 1.0 +8V to +28V Input Voltage Range Up to 18.4V Battery Voltage 11-Bit Battery Voltage Setting ±0.8% Output Voltage Accuracy with Internal Reference 3A (max) Battery Charge Current 6-Bit Charge-Current Setting 99.99% (max) Duty Cycle for Low-Dropout Operation Load/Source Switchover Drivers >97% Efficiency		Notebook Computers Personal Digital Assistants Point-of-Sale Terminals

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