LT3652 Power Tracking 2A Battery Charger (SMD)

The LT3652 is a complete monolithic step-down battery charger that operates over a 4.95V to 32V input voltage range. The LT3652 provides a constant-current/constant-voltage charge characteristic with maximum charge current externally programmable up to 2A. The charger employs a 3.3V float voltage feedback reference so any desired battery float voltage up to 14.4V can be programmed with a resistor divider.The LT3652 employs an input voltage regulation loop which reduces charge current if the input voltage falls below a programmed level set with a resistor divider. When the LT3652 is powered by a solar panel the input regulation loop is used to maintain the panel at peak output power.The LT3652 can be configured to terminate charging when charge current falls below 1/10 of the programmed maximum (C/10). Once charging is terminated the LT3652 enters a low-current (85µA) standby mode. An auto-recharge feature starts a new charging cycle if the battery voltage falls 2.5% below the programmed float voltage. The LT3652 also contains a programmable safety timer used to terminate charging after a desired time is reached. This allows top-off charging at currents less than C/10.