The device supports boost converter operation to deliver power from the battery to other portable devices through PMID pin. The boost mode output current rating supports maximum output current up to 3.1 A (down-to V_{OTG_BAT1}) or 2.4A (down-to V_{OTG_BAT2}) to charge smartphone and tablet at fast charging rate. The boost operation can be enabled if the conditions are valid:

1. BAT above V_{OTG_BAT_EN}
2. VBUS less than BAT+V_SLEEP (in sleep mode)
3. Boost mode operation is enabled (OTG pin HIGH and OTG_CONFIG bit =1)
4. Voltage at TS (thermistor) pin is within range configured by Boost Mode Temperature Monitor as configured by BHOT and BCOLD bits
5. After 30 ms delay from boost mode enable

In boost mode, the device employs a 500 KHz or 1.5 MHz (selectable using BOOST_FREQ bit) step-up switching regulator based on system requirements. To avoid frequency change during boost mode operations, write to boost frequency configuration bit (BOOST_FREQ) is ignored when OTG_CONFIG is set. To improve boost mode light-load efficiency, the device by default switches to PFM control at light load. The PFM mode can be disabled by setting PFM_OTG_DIS bit in i2C.

During boost mode, the status register VBUS_STAT bits is set to 111, the VBUS output is 5.126V by default (selectable via BOOSTV register bits). The boost output is maintained when BAT is above V_{OTG_BAT} threshold

In additon, the MIN_VBAT_SEL bit can be changed to select the minimum battery voltage threshold to automatically exit boost mode.