BU33UV7NUX
Synchronous Boost DC/DC Converter

BU33UV7NUX is a synchronous buck-boost convertor with low power consumption and provides a power supply for products powered by either two-cell alkaline/ NiCd/ NiMH or one-cell Li-ion or Li-polymer battery. Output currents can go as high as 500mA while using two alkaline, and discharge it down to 1.8 V. BU33UV7NUX has reset circuit. (Detection voltage:1.5 V, Release Voltage:1.9 V) BU33UV7NUX output voltage is fixed 3.3V by internal resistor divider. Vout is connected with Vin when VIN voltage is higher than 3.3 V.

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

Product Detail

 
Part Number | BU33UV7NUX-E2
Status | Recommended
Package | VSON010X3020
Unit Quantity | 4000
Minimum Package Quantity | 4000
Packing Type | Taping
RoHS | Yes

Specifications:

Grade

Standard

ch

1

Integrated FET / Controller

Integrated FET

Topology

Boost

Synchronous / Nonsynchronous

Synchronous

Vin1(Min.)[V]

0.6

Vin1(Max.)[V]

4.5

Vout1(Min.)[V]

3.3

Vout1(Max.)[V]

3.3

Iout1(Max.)[A]

0.5

SW frequency(Max.)[MHz]

0.8

Light Load mode

Yes

EN

Yes

PGOOD

No

Operating Temperature (Min.)[°C]

-40

Operating Temperature (Max.)[°C]

85

Package Size [mm]

3x2 (t=0.6)

Features:

  • Synchronous Boost DC/DC Converter
    Iomax500mA @Vout=3.3V, Vin=1.8V (Ta=25°C)
  • Disconnect Function during EN-OFF and UVLO
  • Auto-PFM/PWM (MODE=H(=VIN)),
    FIXED PFM (MODE=L(=0V))
  • Reset Function (Detect Voltage = 1.5V)
  • Pass-Through Function (VIN > VOUT)
  • Thermal Shutdown
  • 10-pin “VSON010X3020” package

Supporting Information

 

BU33UV7NUX is a boost DC/DC converter with built-in MOSFET featuring the lowest current consumption in the industry, making it ideal for electronic devices powered by dry-cell batteries such as electronic dictionaries, remote controls for home appliances, and gadgets (i.e. toys, accessories).

Samples/Evaluation Board

Evaluation Board BU33UV7NUX-EVK-101

In addition to samples of the BU33UV7NUX , an evaluation board integrating the BU33UV7NUX will be available for purchase through online distributors.

Specifications

Part No. Input Voltage Range Output Voltage Current Consumption Max. Load Current Operating Frequency Operating Temp. Range
BU33UV7NUX 0.6V to 4.5V 3.3V 7µA (MODE=L)
13µA (MODE=H)
50mA (MODE=L)
500mA (MODE=H)
800kHz -40 ℃ to 85 ℃

Features

1.Low current consumption and low-voltage drive contribute to longer battery life

Low current consumption and low-voltage drive contribute to longer battery life

In order to prolong operating life with dry-cell batteries, ROHM leveraged original analogy design technologies and power system processes to achieve a current consumption of just 7uA, the smallest in the industry among functionally equivalent products. This makes it possible to increase battery life in conventional remote controls powered by 2 alkaline dry-cell batteries by approx. 1.3x over existing solutions, providing an extra 175 days of operation (ROHM study, assuming standby mode and a load current of 50uA). In addition, the BU33UV7NUX can be driven by input voltages as low as 0.9V and supports both single dry-cell and button-type lithium-ion battery sets. Plus, the built-in battery leak detection function makes it particularly suited for dry-cell applications.

2.Load current mode switching improves efficiency in a wide range of applications

Load current mode switching improves efficiency in a wide range of applications

A load current mode switching function is included that allows existing remote controls to support the latest high-performance LCD-equipped sets while delivering superior energy savings.
Adopting a low-power mode for standard products (50mA max. load current, 7uA current consumption, PFM*1 control), and automatically switching to high-power mode for high-performance (500mA max. load current, 13uA current consumption, PFM/PWM*1 switching control), make it possible to achieve high efficiency power conversion as high as 94% under a wide range of conditions.

<Terminology>

*1) PFM (Pulse Frequency Modulation) / PWM (Pulse Width Modulation)
PFM is a voltage control method that can provide the benefit of reduced switching loss at light loads, while PWM is characterized by constant frequency that makes it easy to predict generated noise and subsequently set up countermeasures such as filters.

Applications

<Target Applications>

…and other sets driven by 1-2 dry-cell (1 to 3V) or button-type li-ion batteries

  • Electronic dictionaries
  • Remote controls
  • Electronic gadgets (i.e. toys, accessories)
  • Wearables
  • Electric toothbrushes

Evaluation
Board

 
    • Evaluation Board
    • BU33UV7NUX-EVK-101
    • The BU33UV7NUX converter provides a power supply solution for products powered by two-cell alkaline, NiCd, NiMH, one-cell Li-ion, or Li-polymer batteries. It can operate even if the input voltage drops to 0.6V. The BU33UV7NUX has a built-in reset circuit that can be set to detect reset at 1.5V (reset release voltage: 1.9V).

  • User's Guide Buy

Design Resources

 

Documents

White Paper

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

User's Guide

  • Evaluation Board User's Guide

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
  • Phase Compensation Design for Current Mode Buck Converter
  • Power Supply Sequence Circuit with General Purpose Power Supply IC
  • Suppression Method of Switching Noise Using Linear Regulator and Low Pass Filter
  • Measurement Method for Phase Margin with Frequency Response Analyzer (FRA)
  • Usage of SPICE Macromodel for DC/DC
  • Calculation of Power Loss (Synchronous)
  • 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
  • Notes for Temperature Measurement Using Thermocouples
  • Two-Resistor Model for Thermal Simulation
  • Notes for Temperature Measurement Using Forward Voltage of PN Junction
  • Thermal Resistance
  • Precautions When Measuring the Rear of the Package with a Thermocouple

Tools

2D/3D/CAD

  • VSON010X3020 Footprint / Symbol
  • VSON010X3020 3D STEP Data

Packaging & Quality

Package Information

  • Package Information

Manufacturing Data

  • Factory Information

Environmental Data

  • REACH SVHC Non-use Declaration