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38 V, 1.5 A synchronous step-down switching regulator evaluation board based on the L6981NDR for industrial power systems

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Parameter NameParameter Value
Operating RangeIndustrial
Target ApplicationBuck Converter
Core ProductL6981NDR
Input Voltage Min Volt5.0
Input Voltage Max Volt38.0
Packing TypeNot Applicable
RoHs compliantEcopack2
Package NameCARD

The STEVAL-L6981NDR is based on the L6981NDR synchronous monolithic step-down regulator delivering up to 1.5 A DC.

Its wide input voltage range makes the solution suitable for a broad range of applications.

The device implements peak current mode architecture in a SO 8L package with internal compensation to minimize design complexity and size.

The L6981 is available in low consumption mode (LCM) and low noise mode (LNM) versions.

LCM maximizes efficiency at light-load with controlled output voltage ripple, making the device extremely suitable for battery-powered applications.

LNM makes the switching frequency constant and minimizes the output voltage ripple overload current range, meeting the specification for noise sensitive applications.

The EN pin manages the enable/disable function. The typical shutdown current is 2 μA when disabled. When the EN pin is pulled up, the device is enabled and the internal 1.3 ms soft-start takes place.

Pulse-by-pulse current sensing on both power elements implements effective constant current protection while thermal shutdown prevents thermal run-away.

Key features
  • 3.5 V to 38 V operating input voltage
  • Output voltage from 0.85 V to VIN
  • 3.3 V and 5 V fixed output voltage versions
  • 1.5 A DC output current
  • 17 μA operating quiescent current (fixed Vout part numbers)
  • Internal compensation network
  • Low noise mode version for noise sensitive applications
  • 2 μA shutdown current
  • Internal soft-start
  • Enable function
  • Overvoltage protection
  • Output voltage sequencing
  • Thermal protection
  • SO-8 package
  • Synchronization with external clock for LNM devices