NB637

NOT RECOMMENDED FOR NEW DESIGNS

High Efficiency 24V, 500kHz Synchronous Step-down Converter

NRFND Datasheet

Parameters Description

Vin (min) (V)
7
Vin (max) (V)
24
Iout (max) (A)
6
Iq (typ) (mA)
1
Vfb (V)
0.805
fsw (max) (kHz)
500
Package (mm)
QFN-14 (3x4)
Grade
Catalog
Isw Limit (typ) (A)
9
Max Duty Cycle (%)
0.9
Regulated Outputs
1
Vout (min) (V)
0.805

The NB637 is a high efficiency synchronous rectified step-down switch mode converter with built-in internal power MOSFETs. It offers a very compact solution to achieve more than 6A output current over a wide input supply range with excellent load and line regulation. The NB637 operates at high efficiency over a wide output current load range. Current mode operation provides fast transient response and eases loop stabilization. Full protection features include OCP and thermal shut down. The NB637 requires a minimum number of readily available standard external components and is available in a space saving QFN14 (3x4mm) package.

Features & Benefits

Wide 7V to 24V Operating Input Range
9A Peak Switch 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
OCP Protection and Thermal Shutdown
Output Adjustable from 0.8V
Available in a QFN14 (3x4mm) Package

Active Part Numbers:

NB637EL-LF-P NB637EL-LF-Z

Meaning of P & Z

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