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

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.

Key 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

Image

×

设计

技术文档

产品规格
Description Version Size
DB0691 DB0691: 0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX 1.2 72 KB

硬件资源

Board Manufacturing Specifications
Description Version Size
Gerber files for STEVAL-ISA055V1 board 1.0 185 KB
Bill of Materials
Description Version Size
BOM for STEVAL-ISA055V1 board 1.0 44 KB
Schematic Packs
Description Version Size
Board schematics for STEVAL-ISA055V1 board 1.0 35 KB

法律

许可协议
Description Version Size
Evaluation products license agreement 1.0 125 KB
支持和社区

样片和购买

型号 Core Product Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STEVAL-ISA055V1 ST1S12GR Active 30.63 1 NEC EAR99 ITALY MORE INFO 直接购买 Add to cart DISTRIBUTOR AVAILABILITY
test

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

质量和可靠性

型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEVAL-ISA055V1 ActiveCARDIndustrialEcopack2
test

(**) 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.

×