ADI LT3652IDD#PBF

LT3652 is a complete monolithic, step-down battery charger that operates over an input voltage range of 4.95V to 32V. The LT3652 provides constant-current/constant-voltage charging with a maximum charge current externally programmable up to 2A. The charger features a 3.3V float voltage feedback reference, allowing a resistor divider to set any desired battery float voltage up to 14.4V.

The LT3652 employs an input voltage regulation loop that reduces charge current if the input voltage falls below a programmed level set by a resistor divider. When the LT3652 is powered by a solar panel, the input regulation loop is used to hold the solar panel at peak output power.

The LT3652 can be configured to terminate charging when the charge current falls below 1/10 (C/10) of the programmed maximum value. When charging terminates, the LT3652 enters a low-current (85μA) standby mode. If the battery voltage drops more than 2.5% below the programmed float voltage, an automatic recharge function initiates a new charge cycle. The LT3652 also includes a programmable safety timer to terminate charging after a desired time period has elapsed. This provides top-off charging under conditions where the current is below C/10.