ROHM Semiconductor GmbH Synchronous Buck-Boost DC/DC Converter with 2 A Switches (VIN = 2.0 V to 5.5 V, 1ch) BD83070GWL

The BD83070GWL was developed to be the de facto standard for low power eco devices used in compact battery-driven applications. Original control technology (X Ramp PWM Control) enables seamless buck-boost transition while built-in low current circuitry achieves an industry-best power conversion efficiency of 97% during operation (200mA load current) along with class-leading 2.8uA current consumption. This contributes to longer operating time in compact battery-driven devices - by as much as 1.14x over standard products during standby (100uA load current).

The BD83070GWL is a synchronous buck-boost DC/DC convertor providing 3.3 V or 2.5 V output from single-cell Li-ion battery or other input between 2.0 V and 5.5 V. It has the capability to support up to 1 A output over input voltage range of 2.7 V to 5.5 V. It seamlessly changes between buck and boost operations depending on the input voltage. It is based on pulse width modulation (PWM) and provides high efficiency for heavy load. While in PWM operation, internal FETs switch at fixed frequency 1.5 MHz typical. It automatically changes over control system to hysteresis pulse frequency modulation (PFM) to suppress switching loss and current consumption during light load. Battery drain fall down to only 2.8 μA typical at no load current. It is possible to disable auto-PFM/PWM mode by the MODE pin for suppressing output ripple and fixed frequency switching. The device is packaged in a 1.2 mm x 1.6 mm WLCSP package.