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NB677 5.5-24V, 8A, 300kHz Synchronous Buck Converter QFN16
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pMPS NB677 — synchronous buck converter, 5.5-24V input, 8A output, 300 kHz, QFN16./p
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NB677 5.5-24V, 8A, 300kHz Synchronous Buck Converter QFN16
MPS NB677 is a synchronous buck converter that accepts 5.5 V to 24 V input, delivers 8 A, switches at 300 kHz, supplied in a QFN16 package.
Key Specifications
| Part Number | NB677 |
| Input Voltage | 5.5 V to 24 V |
| Output Current | 8 A |
| Switching Frequency | 300 kHz |
| Topology | Synchronous Buck Converter |
| Package | QFN16 |
| Ordering Codes | NB677 |
Features
- Wide 5.5V to 24V Operating Input Range
- 3.3V Fixed Output Voltage
- Built-in 3.3V, 100mA LDO with Switches
- 8A Continuous Output Current
- 10A Peak Output Current
- 300kHZ CLK for External Charge Pump
- Low RDS(ON) Internal Power MOSFETs
- Proprietary Switching Loss Reduction Technique
- Internal Soft Start
- Output Discharge
Typical Application Circuit
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 QFN16 — check the land pattern in the datasheet before layout.
Common Questions
What is the input and output rating of the NB677?
5.5–24 V input and 8 A output.
What switching frequency does the NB677 run at?
300 kHz.
Which package is the NB677 available in?
QFN16, with ordering codes NB677-24V.
Shenzhen Gaorunxin Technology Co., Ltd
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