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NB673 5-24V, 1.5A Synchronous Buck Converter QFN21
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pMPS NB673 — synchronous buck converter, 5-24V input, 1.5A output, QFN21./p
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NB673 5-24V, 1.5A Synchronous Buck Converter QFN21
MPS NB673 is a synchronous buck converter that accepts 5 V to 24 V input, delivers 1.5 A, supplied in a QFN21 package.
Key Specifications
| Part Number | NB673 |
| Input Voltage | 5 V to 24 V |
| Output Current | 1.5 A |
| Topology | Synchronous Buck Converter |
| Package | QFN21 |
| Ordering Codes | NB673 |
Features
- Wide 5V to 24V Operating Input Range
- 6A Continuous Output Current and 8A Peak Output Current (NB672)
- 8A Continuous Output Current and 10A Peak Output Current (NB673)
- Built-in +/- 1.5A VTTLDO
- Low RDS(ON) Internal Power MOSFETs
- Proprietary Switching Loss Reduction Technique
- Internal Soft Start
- Output Discharge
- 500kHZ Switching Frequency
- OCP, OVP, UVP Protection and Thermal Shutdown
Applications
- Laptop Computer
- Tablet PC
- Networking Systems
- 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 QFN21 — check the land pattern in the datasheet before layout.
Common Questions
What is the input and output rating of the NB673?
5–24 V input and 1.5 A output.
Which package is the NB673 available in?
QFN21.
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