BD83070GWL-EVK-001 ROHM

Users Guide Switching Regulator Series Synchronous Buck-Boost DC/DC Converter BD83070GWL Evaluation Board BD83070GWL-EVK-001 Introduction This application note will provide the steps necessary to operate and evaluate ROHMs synchronous buck-boost DC/DC converter using BD83070GWL evaluation board. Component selection and operating procedures are included. Description The BD83070GWL converter is a power supply solution designed for battery powered devices. It can operate at pulse frequency modulation (PFM) to suppress loss and current consumption during light load which has 2.8A quiescent current at no load. Capable to support up to 1A output on pulse width modulation (PWM) and provides high efficiency for heavy load. It is possible to disable auto-PFM/PWM mode by via MODE pin. User can select from 2 preset output voltage via VSEL pin and it changes between buck and boost operations depending on the relation between input voltage and output voltage. Application Single Cell Li-ion or 3 Cell NiMH Battery-Powered Portable Products Tablet Terminal Device Smartphone Features Key Specifications Automation PFM/PWM Mode and Fixed PWM Mode Input Voltage Range: 2.0 V to 5.5 V Input Voltage Range: 2.0 V to 5.5 V Output Voltage: 3.3 V or 2.5V Output Current: Up To 1 A (VIN > 2.7 V, VOUT = 3.3 V) Output Current: 1 A Selectable Output Voltage: 2.5 V or 3.3 V Switching Frequency: 1.5 MHz(Typ) Efficiency: Up To 95 % Quiescent VIN Current: 2.8 A(Typ) UVLO Detection: 1.61 V(Max) UCSP50L1C package (1.20 mm 1.60 mm 0.57 mm) Built-in Thermal, Over Voltage, And Over Current Protection Evaluation Board Operating Limits Limit Parameter Symbol Unit Conditions MIN TYP MAX Supply Voltage V 2.0 - 5.5 V IN Output Current IOUT 1 - - A VIN>2.7V, VOUT=3.3V 2019 ROHM Co., Ltd. No. 62UG012E Rev.001 1/12 JUN.2019 Users Guide BD83070GWL-EVK-001 Evaluation Board Material of PCB: FR-4 Number of Layer 4 PCB thickness: 1.4mm 60mm 45mm Figure 1. BD83070GWL Evaluation Board Board Schematic Figure 2. BD83070GWL Evaluation Board Schematic 2019 ROHM Co., Ltd. No. 62UG012E Rev.001 2/12 JUN.2019