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MP28256 4.5-21V 21V, 3A 500kHz Synchronous Step-Down Converter QFN14
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pMPS MP28256 — 21V, 3A 500kHz Synchronous Step-Down Converter, 4.5-21V input, 3 A output, QFN14./p
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MP28256 4.5-21V 21V, 3A 500kHz Synchronous Step-Down Converter QFN14
The MPS MP28256 is a 21V, 3A 500kHz Synchronous Step-Down Converter. It operates from a 4.5 V to 21 V input, is rated for 3 A and switches at 500 kHz. It is supplied in a QFN14 package.
The MP28256 is a synchronous rectified step- down switch mode converter with built in internal power MOSFETs.
Key Specifications
| Part Number | MP28256 |
| Function | 21V, 3A 500kHz Synchronous Step-Down Converter |
| Input Voltage | 4.5 V to 21 V |
| Current Rating | 3 A |
| Switching Frequency | 500 kHz |
| Package | QFN14 |
| Ordering Codes | MP28256 |
Features
- Wide 4.5V to 21V Operating Input Range
- 0.6V internal reference with 2% accuracy
- 3A Output Current
- Low Rds(ON) Internal Power MOSFETs
- Fixed 500kHz Switching Frequency
- Frequency SYNC from 300kHz to 2MHz External Clock
- External Soft Start
- OCP and Thermal Shutdown
- Separate EN and SYNC pins
- Available in a QFN14 (3x4mm) Package.
Typical Application Circuit
Applications
- DSL Modems
- Cable Modems
Design Notes
- Size the inductor for the ripple current at the actual switching frequency, typically 30% of the DC load — not for the DC rating alone.
- The hot loop from input capacitor through the switch to ground sets conducted EMI. Keep that copper area as small as the layout allows.
- Output ripple is set by the capacitor ESR and its DC-bias derating; a 10 µF ceramic often behaves like 4 µF at the rated output voltage.
- Route the feedback divider from the output capacitor terminals, away from the switch node.
Common Questions
What input voltage does the MP28256 support?
4.5 V to 21 V. The rated output is 3 A.
Which package and ordering codes apply to the MP28256?
QFN14; order codes include MP28256.
What are the defining features of the MP28256?
Wide 4.5V to 21V Operating Input Range 0.6V internal reference with 2% accuracy
Shenzhen Gaorunxin Technology Co., Ltd
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