STEVAL-ISA055V1

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0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX

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Product overview

Description

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. This family of products is available in the TSOT23-5L package.

  • All features

    • RDS(on) typ. 250 m and 400 m
    • Not switching quiescent current: max 600 μA over temperature range
    • Uses tiny capacitors and inductors
    • Internal soft-start
    • Enable function
    • Step-down current mode PWM (1.7 MHz) DCDC converter
    • 0.7 A output current capability
    • Fixed output voltage of 1.2 V
    • Synchronous rectification
    • Typical efficiency: > 90%
    • 3% DC output voltage tolerance

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade WEEE Compliant Material Declaration**
STEVAL-ISA055V1
Active
CARD Industrial Ecopack2 -

STEVAL-ISA055V1

Package:

CARD

Material Declaration**:

Marketing Status

Active

Package

CARD

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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STEVAL-ISA055V1 Active

Budgetary Price (US$)*/Qty:
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Part Number:

STEVAL-ISA055V1

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Core Product:

ST1S12GR

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-

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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors