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3 A synchronous 900 kHz step-down DC-DC converter with inhibit function based on the ST1S10 (DFN)
  • active 活性

The STEVAL-ISA044V6 demonstration board is based on the ST1S10 device assembled in a DFN package. The ST1S10 is a step-down DC-DC converter with the inhibit function optimized for powering high voltages in LCD applications and low voltages in digital-core HDD applications. It replaces the high-current linear solution when high power dissipation is an issue.

It provides up to 3 A over an input voltage range of 2.5 V to 18.0 V, and synchronous rectification removes the need for an external Schottky diode. A high internal switching frequency (900 kHz) allows for the use of tiny surface-mount components, as well as a resistor divider to set the output voltage value. Only an inductor and 3 capacitors are required.

The current-mode PWM architecture and stable operation with low-ESR SMD ceramic capacitors result in low output ripple. To maximize power conversion efficiency in light load, the regulator can work in burst mode automatically. The device can operate in PWM mode with a fixed frequency or synchronized to an external frequency. It switches at a frequency of 900 kHz when the SYNC pin is connected to ground or a fixed voltage (less than 5.5 V), and can synchronize the switching frequency between 400 kHz to 1.2 MHz from an external clock applied to the SYNC pin.

A thermal shutdown circuit is integrated and activates at 150 °C. Cycle-by-cycle current limitation provides protection against shorted outputs. The quiescent current is less than 6 μA in the inhibit state.

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Data Brief

Key Features

  • Input voltage range: 2.5 V to 18.0 V
  • Max IOUT: 3 A
  • High internal switching frequency: 900 kHz
  • PWM mode operation with a fixed frequency or synchronized to an external frequency between 400 kHz and 1.2 MHz
  • Inhibit pin available
  • Quiescent current: < 6 μA in inhibit state
  • RoHS compliant


图案 资源


Technical Documentation

Product Specifications

描述 版本 大小
DB1469: 3 A synchronous 900 kHz step-down DC-DC converter with inhibit function based on the ST1S10 (DFN)
1.0 306 KB

Hardware Resources

Board Manufacturing Specification

描述 版本 大小
Gerber files for STEVAL-ISA044V6
1.0 110 KB

Bill of Materials

描述 版本 大小
2.1 7 KB

Schematic Pack

描述 版本 大小
STEVAL-ISA044V6 schematics
2.2 38 KB

样品 & 购买

产品型号 Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISA044V6ActiveST1S10Buy Direct36.75Distributor reported inventory date: 2016-02-10
Distributor NameRegionStockMin. order

(*) 建议零售价格仅用于预算,以美元为单位,每。的报价,以当地货币计算的价格,请联系您当地的 ST 销售办事处 或我们的 分销商
(**) 材料声明表格上提供st.com可以是一般的文件,根据最常用的包,包内的家庭。出于这个原因,他们可能不是100%准确,对于一个特定的设备。请联系我们 销售支持 在特定设备上的信息。
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