Home Products DC-DC DC-DC Converters Buck

SY21240RAC (SY8310RAC)

Production
9A Continuous/14A Peak, 28V Input, Synchronous Step Down Regulator with ±1A VTT LDO and ±10mA Buffered Reference
Datasheet
SY21240RAC 9A Continuous/14A Peak, 28V Input, Synchronous Step Down Regulator with ±1A VTT LDO and ±10mA Buffered Reference Datasheet
Part number SY21240RAC
Channel(#) 2
Vin (min) (V) 4
Vin (max) (V) 24
Switching frequency (min)(kHz) 600
Switching frequency (max)(kHz) 600
Vout (min) (V) 0.6
Vout (max) (V) 2.5
Iout (max) (A) 9
Vout2 (min)(V) 0.5*Vbuck(min)+10mV
Vout2 (max )(V) 0.5*Vbuck(max)+10mV
Iout2 (max)(A) 1
Vref accuracy (±%) 1
Vout accuracy(±%)
Control mode COT+Ripple
Duty cycle (max)(%) 80
Operation mode Auto PFM
Iq (typ) (uA) 85
Features Power good, Output discharge, LDO output, Buffered reference 0.5*Vbuck+10mV souring/sinking LDO output
Package QFN3×3-20
Operating temperature range(°C) -40 to 125
Functional safety category
  • Low RDS(ON) for Internal Switches of the Regulator (Top/Bottom): 27/9mΩ
  • 4~24V Input Voltage Range
  • Instant PWM Architecture to Achieve Fast Transient Responses
  • Internal 450µs Soft-start Limits the Inrush Current
  • 600kHz Pseudo-Constant Switching Frequency
  • PFM/USM Selectable Light Load Operation Mode
  • Power Good Indicator
  • 9A Continuous/14A Peak Output Current Capability of the Regulator
  • ±1% 0.6V Reference
  • ±1A Source/Sink Current Capability of the VTT LDO
  • Buffered Low Noise ±10mA VTTREF Output
  • Support VTT LDO High-Z in S3
  • Output Tracking Discharge Function for the Regulator and VTT LDO
  • Cycle-by-cycle Valley and Peak Current Limit Protection
  • Latch-off Mode Output Under Voltage Protection
  • Latch-off Mode Output Over Voltage Protection
  • Latch-off Mode Over Temperature Protection
  • Input UVLO and Bias UVLO
  • RoHS Compliant and Halogen Free
  • Compact Package: QFN3×3-20

Evaluation Board

  • 21240-11

    Photo of evaluation board

  • 21240-12

    Photo of evaluation board

  • 21240-13

    Photo of evaluation board

  • 21240-14

    Photo of evaluation board

  • 21240-15

    Photo of evaluation board

EVB_SY21240RAC

EVB_SY21240RAC_1 is intended for evaluating 600kHz, 9A continuous output current, 24V input synchronous Buck regulator with ±1A VTT LDO and ±10mA buffered reference.

Design resources

Online Simulation

Technical Documentation

Title Date
Silergy_Catalog_Q2_2026 2026-06-12
QFN3x3-20 2022-05-20