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NB686 4.5-28V, 8A, 500kHz Synchronous Buck Converter QFN-16
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pMPS NB686 — synchronous buck converter, 4.5-28V input, 8A output, 500 kHz, QFN-16./p
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NB686 4.5-28V, 8A, 500kHz Synchronous Buck Converter QFN-16
MPS NB686 is a synchronous buck converter that accepts 4.5 V to 28 V input, delivers 8 A, switches at 500 kHz, supplied in a QFN-16 package.
Key Specifications
| Part Number | NB686 |
| Input Voltage | 4.5 V to 28 V |
| Output Current | 8 A |
| Switching Frequency | 500 kHz |
| Topology | Synchronous Buck Converter |
| Package | QFN-16 |
| Ordering Codes | NB686 |
Features
- Wide 4.5 V to 28 V Operating Input Range
- Compatible for IMVP8
- 135 μA Low Quiescent Current
- 8 A Continous Output Current
- 9A Peak Output Current
- Selectable Ultrasonic Mode
- Selectable 500 kHz/700 kHz Switching Frequency
- Built-In +/- 1 A VTTLDO
- 1% Buffered VTTREF Output
- Adaptive COT for Fast Transient
Typical Application Circuit
Applications
- Laptop Computer
- Networking 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.
- Package QFN-16 — check the land pattern in the datasheet before layout.
Common Questions
What is the input and output rating of the NB686?
4.5–28 V input and 8 A output.
What switching frequency does the NB686 run at?
500 kHz.
Which package is the NB686 available in?
QFN-16.
Shenzhen Gaorunxin Technology Co., Ltd
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