PIN FUNCTION

When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge

cycle is completed, CHRG pin will be in a high-impedance state.

Provides charge current to the battery and regulates the final float voltage to 4.2V/4.3V/4.35V/4.4V. An internal

precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode.

Provides power to the charger, VCC can range from 4.25V to 6.5V and should be bypassed with at least a 10uF

capacitor. When VCC drops to within 30mV of the BAT pin voltage, the HM5030 enters shutdown mode,

dropping IBAT to less than 2uA.

The charge current is programmed by connecting a 1% resistor, RPROG, to ground. When charging in

constant-current mode, this pin servos to 1V. In all modes, the voltage on this pin can be used to measure the

charge current using the following formula:

IBAT = (VPROG/RPROG) x950.

The PROG pin can also be used to shut down the charger. Disconnecting the program resistor from ground

allows a compensated current to pull the PROG pin high. When it reaches the 1.21V shutdown threshold

voltage, the charger enters shutdown mode, charging stops and the input supply current drops to 50uA.

Reconnecting RPROG to ground will return the charger to normal operation.

HM5030