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NB638 4.5-28V, 7A, 200kHz Synchronous Step-down Converter QFN20
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pMPS NB638 — synchronous step-down converter, 4.5-28V input, 7A output, 200 kHz, QFN20./p
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NB638 4.5-28V, 7A, 200kHz Synchronous Step-down Converter QFN20
MPS NB638 is a synchronous step-down converter that accepts 4.5 V to 28 V input, delivers 7 A, switches at 200 kHz, supplied in a QFN20 package.
Key Specifications
| Part Number | NB638 |
| Input Voltage | 4.5 V to 28 V |
| Output Current | 7 A |
| Switching Frequency | 200 kHz |
| Topology | Synchronous Step-down Converter |
| Package | QFN20 |
| Ordering Codes | NB638 |
Features
- Wide 4.5V to 28V Operating Input Range
- 7A Output Current
- Internal 30mΩ High-Side, 12mΩ Low-Side Power MOSFETs
- Proprietary Switching Loss Reduction Technique
- 1% Reference Voltage
- Programmable Soft Start Time
- Soft Shutdown
- 200kHz to 1MHz Switching Frequency
- SCP, OCP, OVP, UVP Protection and Thermal Shutdown
- Output Adjustable from 0.8V to 14V
Applications
- Notebook Systems and I/O Power
- Networking Systems
- Optical Communication 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 QFN20 — check the land pattern in the datasheet before layout.
Common Questions
What is the input and output rating of the NB638?
4.5–28 V input and 7 A output.
What switching frequency does the NB638 run at?
200 kHz, programmable.
Which package is the NB638 available in?
QFN20.
Shenzhen Gaorunxin Technology Co., Ltd
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