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SY21249C1 - Synchronous Step-Down Regulator

General Description

The SY21249C1 high-efficiency synchronous stepdown DC/DC regulator is capable of delivering 11A current over a wide input voltage range of 5.5V to 24V.

To minimize conduction loss, it integrates a main switch and a synchronous switch with very low RDS(ON).

Key Features

  • 5.5.
  • 24V Input Voltage Range.
  • Up to 11A Output Current 100mA LDO Current.
  • Low RDS(ON) for Internal Switches: 17mΩ Top, 7.5mΩ Bottom.
  • Integrated 1.5Ω Bypass Switch.
  • COT Ripple-Based Control to Achieve Fast Transient Responses.
  • Soft-Start Inrush Current Limit.
  • Pseudoconstant Frequency: 600kHz.
  • Fixed 5.15V Output Voltage.
  • ±1.5% Internal Reference Voltage.
  • PFM/Ultrasonic (USM) Selectable Light- Load Operation Mode.
  • Power-Good Indicator.

📥 Download Datasheet

Datasheet Details

Part number SY21249C1
Manufacturer Silergy
File Size 1.54 MB
Description Synchronous Step-Down Regulator
Datasheet download datasheet SY21249C1 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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SY21249C1 High-Efficiency Fast-Response, 11A, 24V Input Synchronous Step-Down Regulator General Description The SY21249C1 high-efficiency synchronous stepdown DC/DC regulator is capable of delivering 11A current over a wide input voltage range of 5.5V to 24V. To minimize conduction loss, it integrates a main switch and a synchronous switch with very low RDS(ON). It operates at a pseudoconstant frequency of 600kHz under heavy load conditions to minimize inductor and capacitor sizes. The SY21249C1 also provides a fixed 5V LDO with 100mA current capability, which can be used to power external peripherals. Under light load conditions, the LDO can be switched over to the buck regulator output to reduce power loss.