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MP4321 3.3-36V, 1A, 350kHz Synchronous Step-Down Converter QFN-12
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pMPS MP4321 — synchronous step-down converter, 3.3-36V input, 1A output, 350 kHz, QFN-12./p
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MP4321 3.3-36V, 1A, 350kHz Synchronous Step-Down Converter QFN-12
MPS MP4321 is a synchronous step-down converter that accepts 3.3 V to 36 V input, delivers 1 A, switches at 350 kHz, supplied in a QFN-12 package.
Key Specifications
| Part Number | MP4321 |
| Input Voltage | 3.3 V to 36 V |
| Output Current | 1 A |
| Switching Frequency | 350 kHz |
| Topology | Synchronous Step-Down Converter |
| Package | QFN-12 |
| Ordering Codes | MP4321 |
Features
- High Performance for Improved Thermals: o 70mΩ/50mΩ Integrated MOSFETs o 65ns Minimum On Time (tON_MIN) o 50ns Minimum Off Time (tOFF_MIN)
Applications
- USB Chargers
- Aftermarket Automotive Applications
- Battery-Powered Systems
Design Notes
- The step-down topology needs an inductor and output capacitor sized for the ripple at the switching frequency, not just the DC load.
- Keep the input loop short — high di/dt at the switch node sets conducted EMI.
- Power switches are integrated, so the thermal path is the PCB copper under the pad.
- AEC-Q100 qualification suits this part to automotive rails.
- Package QFN-12 — check the land pattern in the datasheet before layout.
Common Questions
What is the input and output rating of the MP4321?
3.3–36 V input and 1 A output.
What switching frequency does the MP4321 run at?
350 kHz.
Which package is the MP4321 available in?
QFN-12, with ordering codes MP4321GDE-Z.
Shenzhen Gaorunxin Technology Co., Ltd
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