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DC-DC Buck Converter
DC-DC Buck Converter
SCT9431QFSAR
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3.8V-36V Vin, 3A Synchronous Step-down DCDC Converter with EMI Reduction
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- Product Introduction
- Technical data
- Parameter comparison
Product Features
FEATURES：
- Qualified for Automotive Applications
- AEC-Q100 Qualified with the Following Results:
- Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range
- Device HBM ESD Classification Level H2
- Device CDM ESD Classification Level C3B - 3.8V-36V Wide Input Voltage Range
- Up to 3A Continuous Output Load Current
- EMI Reduction
-Proprietary Gate Design for Switching Node Ringing-free
-Frequency Spread Spectrum (FSS) - Pulse Skipping Mode (PSM) with 22uA Quiescent Current in Light Load Condition
-Up to 79% Efficiency at 1mA Light Load
-Up to 89% Efficiency at 10mA Light Load - 0.8V ±1.5% Feedback Reference Voltage
- Fully Integrated 74mΩ Rdson High Side MOSFET and 40mΩ Rdson Low Side MOSFET
- 1uA Shut-down Current
- 400kHz Switching Frequency
- Precision Enable Threshold for Programmable UVLO Threshold and Hysteresis
- Output Over Voltage Protection
- Thermal Shutdown Protection at 170°C
DESCRIPTION：
The SCT9431Q are 3A synchronous buck converters with up to 36V wide input voltage range, which fully integrates an 74mΩ high-side MOSFET and a 40mΩ low-side MOSFET to provide high efficiency step-down DCDC conversion. The SCT9431Q adopts peak current mode control with integrated compensation network. The SCT9431Q supports the Pulse Skipping Modulation (PSM) with typical 22uA Ultra-Low Quiescent.
The SCT9431Q are optimized for Electromagnetic Interference (EMI) reduction. The converter has proprietary designed gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off time, which further erases high frequency radiation EMI noise caused by the MOSFETs hard switching. The converter features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time.
The SCT9431Q offer output over-voltage protection, cycle-by-cycle peak current limit, and thermal shutdown protection. The device is available in a low profile QFN-9L 3mm X 2mm package.
The SCT9431Q are optimized for Electromagnetic Interference (EMI) reduction. The converter has proprietary designed gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off time, which further erases high frequency radiation EMI noise caused by the MOSFETs hard switching. The converter features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time.
The SCT9431Q offer output over-voltage protection, cycle-by-cycle peak current limit, and thermal shutdown protection. The device is available in a low profile QFN-9L 3mm X 2mm package.
APPLICATIONS：
- Automotive System
- Industrial Control System
- General Consumer
Package information
Technical data
| Title | Time | Download |
|---|---|---|
| SCT9431QFSAR-可靠性报告01122A R1.0.pdf | 2024-11-07 |
 Login Download
|
| SCT9431Q Datasheet Rev 1.3 | 2026-03-19 |
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|
Parameter comparison
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