LTC4121IUD-4.2#PBF

LTC4121-4.2 is a constant-current/constant voltage (CC/CV) synchronous step-down battery charger. In addition to CC/CV operation, this device regulates its input voltage to a programmable percentage of the input open-circuit voltage. This technique maintains maximum power transfer with high impedance input sources such as solar panels. This device include an accurate RUN pin threshold, low voltage battery preconditioning and bad battery fault detection, timer termination, auto-recharge, and NTC temperature qualified charging. The FAULT pin provides an indication of bad battery or temperature faults. It is widely used in application such as handheld instruments, solar powered devices, industrial/military sensors and devices etc.

• Operating input supply range is 4.4V to 40V
• Temperature compensated input voltage
• Regulation for maximum power point tracking (MPPT)
• Fixed 4.2V float voltage option
• High efficiency upto 95%
• Feedback voltage accuracy is ±1%
• Programmable accurate charge current is 5%
• Programmable charge current is 50mA to 400mA
• Operating temperature is -40°C to 125°C
• Packaging style is 16-lead plastic QFN

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