The TPS61022 is a synchronous boost converter designed to operate from an input voltage supply range between 0.5 V and 5.5 V with a minimum 6.5-A valley switch current limit. The TPS61022 typically operates at a quasi-constant 1-MHz frequency PWM at moderate-to-heavy load currents when the input voltage is above 1.5 V. The switching frequency changes to 0.6 MHz gradually with the input voltage changing from 1.5 V to 1 V for better efficiency and high step-up ratio. When the input voltage is below 1 V, the switching frequency is fixed at a quasi-constant 0.6 MHz. At light load currents, when the MODE pin is set to low logic level, the TPS61022 converter operates in power-save mode with PFM to achieve high efficiency over the entire load current range. When the MODE pin is set to high logic level, the TPS61022 converter operates in forced PWM mode to keep the switching frequency constant.