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NB649 5.5-25V, 8A, 600kHz Synchronous Step-Down Converter QFN30
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pMPS NB649 — synchronous step-down converter, 5.5-25V input, 8A output, 600 kHz, QFN30./p
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NB649 5.5-25V, 8A, 600kHz Synchronous Step-Down Converter QFN30
MPS NB649 is a synchronous step-down converter that accepts 5.5 V to 25 V input, delivers 8 A, switches at 600 kHz, supplied in a QFN30 package.
Key Specifications
| Part Number | NB649 |
| Input Voltage | 5.5 V to 25 V |
| Output Current | 8 A |
| Switching Frequency | 600 kHz |
| Topology | Synchronous Step-Down Converter |
| Package | QFN30 |
| Ordering Codes | NB649 |
Features
- Wide 5.5V to 25V Operating Input Range
- 8A Output Current
- Internal Low RDS(ON) Power MOSFETs
- Fixed 600kHz switching frequency
- Sync from 300kHz to 1MHz External Clock
- Integrated 100mA LDO
- Internal Compensation
- Power Good Output
- Integrated Bootstrap Diode
- OCP Protection and Thermal Shutdown
Applications
- Notebook Systems and I/O Power
- 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 QFN30 — check the land pattern in the datasheet before layout.
Common Questions
What is the input and output rating of the NB649?
5.5–25 V input and 8 A output.
What switching frequency does the NB649 run at?
600 kHz.
Which package is the NB649 available in?
QFN30.
Shenzhen Gaorunxin Technology Co., Ltd
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