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

•

Two different versions: LCM for high efficiency at light loads and LNM for noise

sensitive applications

•

2 μA shutdown current

•

Internal soft-start

•

Enable function

•

Overvoltage protection

•

Output voltage sequencing

•

Thermal protection

•

SO 8L package

•

Synchronization with external clock for LNM devices

Description

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.

Product summary

38 V, 1.5 A

synchronous step-

down switching

regulator evaluation

board based on the

L6981NDR

STEVAL-

L6981NDR

38 V, 1.5 A

synchronous step-

down converter

with low quiescent

current

L6981NDR

Applications

Power tools

38 V, 1.5 A synchronous step-down switching regulator evaluation board based

on the L6981NDR

STEVAL-L6981NDR

Data brief

DB4416 - Rev 2 - March 2021

For further information contact your local STMicroelectronics sales office.

www.st.com