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MP28251 4A, 300kHz Synchronous Step-Down Converter QFN2
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pMPS MP28251 — synchronous step-down converter, 4A output, 300 kHz, QFN2./p
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MP28251 4A, 300kHz Synchronous Step-Down Converter QFN2
MPS MP28251 is a synchronous step-down converter that delivers 4 A, switches at 300 kHz, supplied in a QFN2 package.
Key Specifications
| Part Number | MP28251 |
| Output Current | 4 A |
| Switching Frequency | 300 kHz |
| Topology | Synchronous Step-Down Converter |
| Package | QFN2 |
| Ordering Codes | MP28251 |
Features
- Wide 4.75V-to-20V Operating Input Range
- 4A Output Current
- Low RDS(ON) Internal Power MOSFETs
- Programmable Switching Frequency
- Programmable EN Delay
- Frequency SYNC from 300kHz to 2MHz External Clock
- Low Power Mode Selectable by an External Signal
- External Soft Start
- OCP and Thermal Shutdown
- Available in a 14-pin QFN2×3 Package
Applications
- DSL Modems
- Cable Modems
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.
- Package QFN2 — check the land pattern in the datasheet before layout.
Common Questions
What switching frequency does the MP28251 run at?
300 kHz, programmable.
Which package is the MP28251 available in?
QFN2.
Shenzhen Gaorunxin Technology Co., Ltd
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