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LTC4121 Solar Panel Charging 4.2V Li-Ion Battery at 400mA

Design Example 1 with LTC4121-4.2

The LTC®4121 is a 400mA constant-current/constantvoltage (CC/CV) synchronous step-down battery charger. In addition to CC/CV operation, the LTC4121 regulates its input voltage to a programmable percentage of the input open-circuit voltage. This technique enables maximum power operation with high impedance input sources such as solar panels.

LTC4121 Efficiency vs VIN at VFLOAT = 8.4V