Reference Design Library > AC/DC and DC/DC Conversion > DC/DC SMPS - Single Output > STEVAL-ISA055V1: 1.2V @ 700mA, 2.5 ~ 5.5V in

STEVAL-ISA055V1: 1.2V @ 700mA, 2.5 ~ 5.5V in

Summary

This demonstration board is based on the ST1S12 family of synchronous step-down DC-DC converters optimized for powering low-voltage digital cores in HDD (hard disk drive) applications and is generally used to replace high-current linear solutions when power dissipation may cause high heating of the application environment.

It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency of 1.7 MHz allows the use of tiny surface-mount components. For the adjustable version, a resistor divider to set the output voltage value, an inductor, and two capacitors are required. Only an inductor and 2 capacitors are needed for the 1.2 V and 1.8 V fixed version. A low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR surface-mount ceramic capacitors.

The ST1S12 device is thermal protected and current limited to prevent damage due to accidental short-circuit.

Specifications

Manufacturer STMicroelectronics
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number 497-8219-ND
Eval Board Supplier STMicroelectronics
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 1.2 V
Current Out 700 mA
Voltage In 2.5 ~ 5.5 V
Efficiency @ Conditions >77%, 3V in, 1.2V @ 0.05 ~ 700 mA
Voltage Out Range 0.6 ~ Vin
Features Current Limit (Adj. or Fixed)
Over Current Protection
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 1.7 MHz
Standby Current [Typical] 1 µA
Quiescent Current [Typical] 500 µA
Component Count + Extras 6 + 2
Internal Switch Yes
Design Author STMicroelectronics
Application / Target Market Computers
Point of Load (PoL)
Standby Current [Maximum] 1 µA
Quiescent Current [Maximum] 600 mA
Main I.C. Base Part ST1S12_ADJ
Date Created By Author
Date Added To Library 2011-03

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Support Documents & Media

ST1S12xx - Datasheet ST1S12 - User Guide - App Note AN2728 STEVAL-ISA055V1 - Data Brief

Media

STEVAL_ISA055V1_Schematic.JPG STEVAL_ISA055V1_Board.JPG STEVAL_ISA055V1_Chart.JPG