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MP8718 4.5-21V, 4A, 500kHz Synchronous Step-down Converter SOIC
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pMPS MP8718 — Synchronous Step-down Converter, 4.5-21V input, 4 A output, SOIC./p
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MP8718 4.5-21V, 4A, 500kHz Synchronous Step-down Converter SOIC
The MPS MP8718 is a Synchronous Step-down Converter. It operates from a 4.5 V to 21 V input, is rated for 4 A and switches at 500 kHz. It is supplied in a SOIC package.
The MP8718 is a high frequency synchronous rectified step-down switch mode converter with built in internal power MOSFETs.
Key Specifications
| Part Number | MP8718 |
| Function | Synchronous Step-down Converter |
| Input Voltage | 4.5 V to 21 V |
| Current Rating | 4 A |
| Switching Frequency | 500 kHz |
| Package | SOIC |
| Ordering Codes | MP8718 |
Features
- Wide 4.5V to 21V Operating Input Range
- 4A Output Current
- Low Rds(on) Internal Power MOSFETs
- Proprietary Switching Loss Reduction Technique
- High Efficiency Synchronous Mode Operation
- Fixed 500kHz Switching Frequency
- Sync from 300kHz to 2MHz External Clock
- 1.5ms Internal Soft-Start
- Internal Compensation
- OCP Protection and Hiccup
Typical Application Circuit
Applications
- Notebook Systems and I/O Power
- Networking Systems
- Digital Set Top Boxes
- Personal Video Recorders
- Flat Panel Television and Monitors
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 MP8718 support?
4.5 V to 21 V. The rated output is 4 A.
Which package and ordering codes apply to the MP8718?
SOIC; order codes include MP8718.
What are the defining features of the MP8718?
Wide 4.5V to 21V Operating Input Range 4A Output Current
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