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Nano Energy™ - Ultra Low Iq Buck Converter For Low Power Applications - BD70522GUL

The BD70522GUL is a Buck Converter featuring 180nA quiescent current and supports output current up to 500mA. The Constant ON-Time (COT) control with ULP (Ultra Low Power) mode provides superior transient response and extends battery life by providing excellent light load efficiency below 10μA load range. The output voltage can be selected from 9 pre-set voltages by VSEL pins. When the input voltage gets close to the output voltage, the IC enters 100%ON mode where the switching operation stops.

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Technical Documents

User's Guide

Evaluation Board User's Guide
 
BD70522GUL Ultra-Low Iq Buck Converter Evaluation Board

Application Note

Reference Circuit
 
BD70522GUL Reference Circuit
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.
Method for Determining Constants of
 
This application note explains the procedures for determining the constants of peripheral parts of a buck DC/DC converter.
PCB Layout Techniques of Buck Converter
 
Major problems that arise from in appropriate layout may cause increase in noise superposed by output and switching signal, the deterioration of regulator, and also lack of stability...
Bootstrap Circuit in the Buck Converter
 
This application note explains the step-up circuit using a bootstrap capacitor. In buck converters, this circuit is used when the highside switch is the N-ch MOSFET.
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.
Snubber Circuit for Buck Converter IC
 
In buck converter ICs, many high-frequency noises are generated at switch nodes. A snubber circuit provides one way of eliminating such harmonic noise. This application note explains how to set up the RC snubber circuits.
Efficiency of Buck Converter
 
This application note explains power loss factors and methods for calculating them. It also explains how the relative importance of power loss factors depends on the specifications of the switching power source.
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.
Inductor Calculation for Buck converter IC
 
This application note covers the steps required in choosing the inductor and to calculate the value used in buck regulator IC circuits.
Considerations for Power Inductors Used for Buck Converters
 
This application note explains the features and things to consider when shopping for power inductors.
Capacitor Calculation for Buck converter IC
 
This application note explains the calculation of external capacitor value for buck converter IC circuit.
The Important Points of Multi-layer Ceramic Capacitor Used in Buck Converter circuit
 
Using unmatched MLCC may not obtain required target characteristics for power supply circuit and may cause abnormal operation. This application note explains the important points while using MLCC.
Resistor Value Table to set Output Voltage of Buck Converter IC
 
This Application Note offers reference table to easily set resistor values for output voltage with various internal reference voltages VREF.
Part Explanation
 
For ICs

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