L6981 datasheet(1/49 Pages) STMICROELECTRONICS

部件名	L6981

功能描述	38 V, 1.5 A synchronous step-down converter with low quiescent current

PDF	49 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 49 page

SO 8L

Features

•

3.5 V to 38 V operating input voltage

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Output voltage from 0.85 V to VIN

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1.5 A DC output current

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Internal compensation network

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

sensitive applications

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2 μA shutdown current

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Internal soft-start

•

Enable

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Overvoltage protection

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Output voltage sequencing

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Thermal protection

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Synchronization to external clock for LNM devices

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SO8 package

Applications

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Designed for 24 V buses industrial power systems

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24 V battery powered equipment

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Decentralized intelligent nodes

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Sensors and always-on applications

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Low noise applications

Description

The L6981 is an easy to use synchronous monolithic step-down regulator capable

of delivering up to 1.5 A DC to the load. The wide input voltage range makes the

device suitable for a broad range of applications. The L6981 is based on a peak

current mode architecture and is packaged in an SO8 with internal compensation,

thus minimizing design complexity and size.

The L6981 is available both in low consumption mode (LCM) and low noise mode

(LNM) versions. LCM maximizes the efficiency at light-load with controlled output

voltage ripple so the device is suitable for battery-powered applications. LNM makes

the switching frequency constant and minimizes the output voltage ripple for light-

load operations, meeting the specification for low noise sensitive applications.

The EN pin provides enable/disable functionality. The typical shutdown current is

2 µA when disabled. As soon as 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 an effective constant current protection and thermal

shutdown prevents thermal run-away.

Maturity status link

L6981

38 V, 1.5 A synchronous step-down converter with low quiescent current

L6981

Datasheet

DS13554 - Rev 1 - January 2021

For further information contact your local STMicroelectronics sales office.

www.st.com

类似零件编号 - L6981

制造商	部件名	数据表	功能描述
STMicroelectronics	L6982	2Mb / 48P	38 V, 2 A synchronous step-down converter with low quiescent current Rev 1
	L6982CDR	2Mb / 48P	38 V, 2 A synchronous step-down converter with low quiescent current Rev 1
	L6982NDR	2Mb / 48P	38 V, 2 A synchronous step-down converter with low quiescent current Rev 1
	L6983	4Mb / 63P	38 V, 3 A synchronous step-down converter with 17 μA quiescent current Rev 1 - October 2019
	L6983C33QTR	4Mb / 63P	38 V, 3 A synchronous step-down converter with 17 μA quiescent current Rev 1 - October 2019

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类似说明 - L6981

制造商	部件名	数据表	功能描述
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Leshan Radio Company	LR8501	825Kb / 11P	1.5MHz 600mA Synchronous Step-Down Converter with Low Quiescent Current
STMicroelectronics	L6983	4Mb / 63P	38 V, 3 A synchronous step-down converter with 17 μA quiescent current Rev 1 - October 2019
	L6983	4Mb / 63P	38 V, 3 A synchronous step-down converter with 17 μA quiescent current Apr-2020
	L6982	2Mb / 48P	38 V, 2 A synchronous step-down converter with low quiescent current Rev 1