The device supports boost converter operation to deliver power from the battery to other portable devices through USB port. The boost mode output current rating meets the USB On-The-Go 500 mA output requirement. The maximum output current is up to 1.2 A. The boost operation can be enabled if the conditions are valid:

1. BAT above V_{OTG_BAT}
2. VBUS less than BAT+V_SLEEP (in sleep mode)
3. Boost mode operation is enabled (OTG_CONFIG bit = 1)
4. Voltage at TS (thermistor) pin as a percentage of V_REGN is within acceptable range (V_BHOT < V_TS < V_BCOLD)
5. After 30-ms delay from boost mode enable

During boost mode, the status register VBUS_STAT bits is set to 111, the VBUS output is 5.15 V and the output current can reach up to 1.2 A, selected through I²C (BOOST_LIM bit). The boost output is maintained when BAT is above V_{OTG_BAT} threshold.

When OTG is enabled, the device starts up with PFM and later transits to PWM to minimize the overshoot. The PFM_DIS bit can be used to prevent PFM operation in either buck or boost configuration.