ST1S03

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1.5 A, 1.5 MHz adjustable, step-down switching regulator

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Product overview

Description

The ST1S03 is a step-down DC-DC converter optimized for powering a low voltage digital core in HDD applications and, generally, to replace the high current linear solution when the power dissipation may cause a high heating of the application environment. It provides up to 1.5 A over an input voltage range of 3 V to 16 V. A high switching frequency (1.5 MHz) allows the use of tiny surface-mount components: as well as the resistor divider to set the output voltage value, only an inductor, a Schottky diode and two capacitors are required. Besides, a low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR SMD ceramic capacitors. The device is thermal protected and current limited to prevent damages due to an accidental short-circuit. The ST1S03 device is available in a DFN6D package.
  • All features

    • Step-down current mode PWM (1.5 MHz) DC-DC converter
    • 2% DC output voltage tolerance
    • Internal soft-start for STARTUP current limitation and power on delay of 50 - 100 μs
    • Typical efficiency: > 70% over all operating conditions
    • 1.5 A output current capability
    • Not switching quiescent current: max 2.5 mA over temperature range
    • Switch VDS: max. 350 mV at ISW= 750 mA
    • Uses tiny capacitors and inductors
    • Available in DFN6D 3 x 3 mm package with exposed pad

Circuit Diagram

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    • Part number
      Status
      Description
      Type
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      STEVAL-ISA042V2

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      1.5 A / 3.3 V step-down DC-DC converter demonstration board based on the ST1S03

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      1.5 A / 3.3 V step-down DC-DC converter demonstration board based on the ST1S03

EDA Symbols, Footprints and 3D Models

STMicroelectronics - ST1S03

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST1S03PUR
Active
DFN6 3x3 Industrial Ecopack2

ST1S03PUR

Package:

DFN6 3x3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 3x3

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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Input Specification
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V
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Output
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Output Power: 0

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
ST1S03PUR No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape And Reel DFN6 3x3 0 125 PHILIPPINES

ST1S03PUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DFN6 3x3

Operating Temperature (°C)

(min)

0

(max)

125

Budgetary Price (US$)* / Qty

Country of Origin

PHILIPPINES

(*) 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