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MP8666 4.5-21V, 6A, 600kHz Step-Down Converter SOIC
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pMPS MP8666 — Step-Down Converter, 4.5-21V input, 6 A output, SOIC./p
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MP8666 4.5-21V, 6A, 600kHz Step-Down Converter SOIC
The MPS MP8666 is a Step-Down Converter. It operates from a 4.5 V to 21 V input, is rated for 6 A and switches at 600 kHz. It is supplied in a SOIC package.
The MP8666 is a monolithic step-down switch mode converter with a built in high-side internal power MOSFET and a gate driver for a low-side external MOSFET.
Key Specifications
| Part Number | MP8666 |
| Function | Step-Down Converter |
| Input Voltage | 4.5 V to 21 V |
| Current Rating | 6 A |
| Switching Frequency | 600 kHz |
| Peak Efficiency | 95% |
| Package | SOIC |
| Ordering Codes | MP8666 |
Features
- Wide 4.5V to 21V Operating Input Range
- 6A Continuous Output Current
- 45mΩ Internal Power MOSFET Switch
- Synchronizable Gate Driver Delivers up to 95% Efficiency
- Fixed 600KHz Frequency
- Synchronizable up to 1.5MHz
- Cycle-by-Cycle Over Current Protection with Hiccup
- Thermal Shutdown
- Output Adjustable from 0.8V
- Stable with Low ESR Output Ceramic Capacitors
Typical Application Circuit
Applications
- Point of Load Regulator in Distributed Power System
- Digital Set Top Boxes
- Personal Video Recorders
- Broadband Communications
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 MP8666 support?
4.5 V to 21 V. The rated output is 6 A.
Which package and ordering codes apply to the MP8666?
SOIC; order codes include MP8666.
What are the defining features of the MP8666?
Wide 4.5V to 21V Operating Input Range 6A Continuous Output Current
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