BU33UV7NUX - Documentation

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.

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

User's Guide

Evaluation Board User's Guide
 
Synchronous Boost DC/DC Converter BU33UV7NUX Evaluation Board

Application Note

Considering Input Filter to Reduce Conducted Emissions by DCDC Converter
 
This application note is about designing input filter which is attributed to reduce level of conducted emissions to an acceptable value for DC-DC converter.
Notes for Temperature Measurement Using Thermocouples
 
This application note explains cautions regarding the temperature measurement. The content of this application note is generally applicable, irrespective of the types of semiconductor devices.
Two-Resistor Model for Thermal Simulation
 
This application note explains the two-resistor model, which is the simplest model among thermal models used in thermal simulations. The thermal simulations mentioned three-dimensional model thermal conduction and thermal fluid analysis tools.
Notes for Temperature Measurement Using Forward Voltage of PN Junction
 
This application note explains cautions regarding the temperature measurement Using Forward Voltage of PN Junction. The content of this application note is generally applicable, irrespective of the types of semiconductor devices.
Considering Polarity of Power Inductor to Reduce Radiated Emission of DC-DC converter
 
This application note is about radiated emission caused by a power inductor in a DC-DC converter dependent to the polarity of a coil.
Method for Monitoring Switching Waveform
 
This application note explains how to correctly monitor the switching waveforms of the power device element such as switching power supply or a motor drive circuit.
Suppression Method of Switching Noise Using Linear Regulator and Low Pass Filter
 
This application note describes the method and result of the ripple and switching noise suppression using a linear regulator and a low pass filter.
Phase Compensation Design for Current Mode Buck Converter
 
This application note explains the method used by ROHM for designing the phase compensation for current mode buck converters.
Power Supply Sequence Circuit with General Purpose Power Supply IC
 
This application note proposes a circuit that accomplishes the power supply sequence without using any dedicated power supply sequence IC, by using general purpose power supply ICs.
Measurement Method for Phase Margin with Frequency Response Analyzer (FRA)
 
This application note introduces a method for easily measuring the phase margin with a Frequency Response Analyzer (FRA) made by NF Corporation.
Usage of SPICE Macromodel for DC/DC
 
This application note explains how to install SPICE macromodels and how the circuit symbols are configured.
Calculation of Power Loss (Synchronous)
 
This application note describes how to obtain the power loss required to calculate the temperature of a semiconductor device. Temperature control is important to ensuring product reliability.
Thermal Resistance
 
The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.
Part Explanation
 
For ICs