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

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).

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* This is a standard-grade product.
For Automotive usage, please contact Sales.

Product Detail

Part Number | BD83070GWL-E2
Status | Recommended
Package | UCSP50L1C
Unit Quantity | 3000
Minimum Package Quantity | 3000
Packing Type | Taping
RoHS | Yes






Integrated FET / Controller

Integrated FET


Buck / Boost

Synchronous / Nonsynchronous












SW frequency(Max.)[MHz]


Light Load mode






Operating Temperature (Min.)[°C]


Operating Temperature (Max.)[°C]


Package Size [mm]

1.2x1.6 (t=0.57)


  • Synchronous Buck-Boost DC/DC Converter
  • Automatic PFM/PWM Transition
  • Output Current: Up To 1A (VIN > 2.7V, VOUT = 3.3V)
  • Selectable Output Voltage: 2.5V or 3.3V
  • Efficiency: Up To 95%
  • UVLO Detection: 1.61V(Max)
  • Built-in Thermal, Over Voltage, And Over Current Protection

Supporting Information



In recent years, the proliferation of battery-driven electronic devices has increased the demand for smaller components that can provide the necessary design flexibility and space for integrating new functions while minimizing power consumption to maximize battery life.
In response, ROHM developed a power supply IC that meets market needs by leveraging a vertically integrated production system utilizing in-house analog design expertise and specialized power processes. At the same time, high efficiency ultra-low-power boost (BU33UV7NUX) and buck (BD70522GUL) power supply ICs are available that allow users to significantly extend the operating time of battery-powered applications. With the new BD83070GWL, ROHM expands its offering with a buck-boost IC featuring industry-leading performance.
ROHM is committed to leveraging superior analog technologies to develop power-saving high performance power supply ICs that contribute to greater energy efficiency.

Distribution Inventory

Energy-Saving Power Supply IC Lineup for Mobile Devices

Functions Part No. Current Consumption Input Voltage output Voltage Max. Output Current Operating Frequency Max. Efficiency Package
Boost BU33UV7NUX 7µA
0.6 ~ 4.5V 3.3V 50mA
800kHz 91%
(3mm x 2mm)
Buck BD70522GUL 0.18µA 2.5 ~ 5.5V 1.2, 1.5, 1.8, 2.0, 2.5, 2.8, 3.0, 3.2, 3.3V 500mA 1MHz 90%
(1.76mm x 1.56mm)
Buck-Boost BD83070GWL 2.8µA 2.0 ~ 5.5V 2.5, 3.3V 1000mA 1.5MHz 97%
(1.2mm x 1.6mm)

Key Features

1.Industry-leading 97% efficiency ensures ultra-high efficiency over a broad range of load current

Industry-leading 97% efficiency ensures ultra-high efficiency over a broad range of load current
Integrating a low-RDS(on) MOSFET with 0.13μm BiCDMOS power process allows to achieve an the best power conversion efficiency in the industry of 97% during operation (200mA load current) and over 90% efficiency at other light loads (from 100μA) to heavy loads (1A). This enables ultra-high-efficiency power conversion in a wide variety of battery-powered applications.
In addition, ROHM’s original control technology (X Ramp PWM Control) enables seamless buck-boost transition.
[Patent Nos. 2015-121194, 2016-243569, 2018-023007]

2.Buck-boost power supply IC achieves ultra-low current consumption (2.8μA)

Combining low current circuit that provides ultra-low current consumption and fast response and an optimized switching control function adapts to different load conditions to reduce loss results in a best-in-class current consumption of 2.8μA.
[Patent Nos. 2016-253301, 2016-253303]

Application Examples

◇Coin battery equipped sets (i.e. IoT)
◇Li-ion battery devices, including smartphones, tablets, and PCs
◇Battery-driven equipment such as toys and electric toothbrushes

Contributes to long-term operation in virtually any compact battery-powered application, regardless of functions or operating conditions


    • Evaluation Board
    • BD83070GWL-EVK-001
    • 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 2.8μA quiescent current at no load. Capable to support up to 1A output on pulse width modulation (PWM) and provides high efficiency for heavy load.

  • User's Guide Buy

Design Resources



White Paper

  • Cutting-Edge Web Simulation Tool “ROHM Solution Simulator” Capable of Complete Circuit Verification of Power Devices and Driver ICs

User's Guide

  • Synchronous Buck-Boost DC/DC Converter BD83070GWL Evaluation Board

Technical Articles

Schematic Design & Verification

  • Calculation of Power Dissipation in Switching Circuit
  • Considering Input Filter to Reduce Conducted Emissions by DCDC Converter
  • Considering Polarity of Power Inductor to Reduce Radiated Emission of DC-DC converter
  • Method for Monitoring Switching Waveform
  • Power Supply Sequence Circuit with General Purpose Power Supply IC
  • Suppression Method of Switching Noise Using Linear Regulator and Low Pass Filter
  • PCB Layout Techniques of Buck Converter
  • Phase Compensation Design for Current Mode Buck Converter
  • Measurement Method for Phase Margin with Frequency Response Analyzer (FRA)
  • Usage of SPICE Macromodel for DC/DC
  • Snubber Circuit for Buck Converter IC
  • Efficiency of Buck Converter
  • Calculation of Power Loss (Synchronous)
  • Inductor Calculation for Buck converter IC
  • Considerations for Power Inductors Used for Buck Converters
  • Capacitor Calculation for Buck converter IC
  • The Important Points of Multi-layer Ceramic Capacitor Used in Buck Converter circuit
  • Resistor Value Table to set Output Voltage of Buck Converter IC
  • Importance of Probe Calibration When Measuring Power: Deskew
  • Impedance Characteristics of Bypass Capacitor

Thermal Design

  • What Is Thermal Design
  • Basics of Thermal Resistance and Heat Dissipation
  • Method for Calculating Junction Temperature from Transient Thermal Resistance Data
  • Two-Resistor Model for Thermal Simulation
  • Notes for Temperature Measurement Using Thermocouples
  • Notes for Temperature Measurement Using Forward Voltage of PN Junction
  • Thermal Resistance
  • Precautions When Measuring the Rear of the Package with a Thermocouple

Packaging & Quality

Package Information

  • Package Information

Manufacturing Data

  • Factory Information

Environmental Data

  • REACH SVHC Non-use Declaration