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SY21031ABC (SY8401ABC)

Production
High Efficiency, 1.2MHz, 55V Input, 0.8A Asynchronous Step Down Regulator
Datasheet
SY21031ABC High Efficiency, 1.2MHz, 55V Input, 0.8A Asynchronous Step Down Regulator Datasheet
Part number SY21031ABC
Channel(#) 1
Vin (min) (V) 4.5
Vin (max) (V) 55
Switching frequency (min)(kHz) 1200
Switching frequency (max)(kHz) 1200
Vout (min) (V) 0.6
Vout (max) (V) 24
Iout (max) (A) 0.8
Vout2 (min)(V)
Vout2 (max )(V)
Iout2 (max)(A)
Vref accuracy (±%) 1
Vout accuracy(±%)
Control mode COT OFF+Ipeak
Duty cycle (max)(%) 80
Operation mode Auto PFM
Iq (typ) (uA) 150
Features Asynchronous
Package SOT23-6
Operating temperature range(°C) -40 to 125
Functional safety category
  •      Low RDS(ON) for Internal N-channel Power FET: 700mΩ
  •      4.5-55V Input Voltage Range
  •      0.8A Output Current Capability
  •      1.2MHz Pseudo Constant Switching Frequency
  •      Internal Soft-start Limits the Inrush Current
  •      Hic-cup Mode Output Short Circuit Protection
  •      EN ON/OFF Control with Accurate Threshold
  •      Cycle by Cycle Peak Current Limit
  •      0.6V±1 % Reference Voltage
  •      SOT23-6  Package

Evaluation Board

  • 21031-1

    Photo of evaluation board

  • 21031-2

    Photo of evaluation board

  • 21031-3

    Photo of evaluation board

EVB_SY21031ABC

The EVB_SY21031ABC is intended for evaluating fast response, 0.8A, 55V input, 1.2MHz asynchronous Buck regulator.

Technical Documentation

Title Date
Silergy_Catalog_Q2_2026 2026-06-12