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NB634 4.5-24V, 5A, 500kHz Synchronous Step-down Converter QFN14
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pMPS NB634 — synchronous step-down converter, 4.5-24V input, 5A output, 500 kHz, QFN14./p
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NB634 4.5-24V, 5A, 500kHz Synchronous Step-down Converter QFN14
MPS NB634 is a synchronous step-down converter that accepts 4.5 V to 24 V input, delivers 5 A, switches at 500 kHz, supplied in a QFN14 package.
Key Specifications
| Part Number | NB634 |
| Input Voltage | 4.5 V to 24 V |
| Output Current | 5 A |
| Switching Frequency | 500 kHz |
| Topology | Synchronous Step-down Converter |
| Package | QFN14 |
| Ordering Codes | NB634 |
Features
- Wide 4.5V to 24V Operating Input Range
- 5A Output Current
- Low RDS(ON) Internal Power MOSFETs
- Proprietary Switching Loss Reduction Technique
- Fixed 500kHz Switching Frequency
- Sync from 300kHz to 2MHz External Clock
- Internal Compensation
- Latch-off OCP Protection and Thermal Shutdown
- Output Adjustable from 0.8V
- Available in a QFN14 (3mmx4mm) Package
Applications
- Notebook Systems and I/O Power
- Networking Systems
- Digital Set Top Boxes
- Personal Video Recorders
- Flat Panel Television and Monitors
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 QFN14 — check the land pattern in the datasheet before layout.
Common Questions
What is the input and output rating of the NB634?
4.5–24 V input and 5 A output.
What switching frequency does the NB634 run at?
500 kHz.
Which package is the NB634 available in?
QFN14.
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