L6981 datasheet(3/49 Pages) STMICROELECTRONICS

Part #	L6981

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

PDF	49 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Pin configuration

Figure 2. Pin connection (top view)

BOOT

VCC

FB/VOUT

EN/CLKIN(*)

AGND

VIN

PGND

(*) Synchronization is allowed for LNM versions only.

Table 1. Pin description

Pin #

Symbol

Function

Switching node

BOOT

Connect an external capacitor (100 nF typ.) between BOOT and SW pins. The

gate charge required to drive the internal NMOS is refreshed during the low side

switch conduction time.

VCC

This pin supplies the embedded analog circuitry. Connect a ceramic capacitor

(≥ 1 µF) to filter internal voltage reference.

FB/VOUT

FB is output voltage sensing with eternal voltage divider

EN/CLKIN

Enable pin with internal voltage divider. Pull down/up to disable/enable the

device.

In LNM versions, this pin is also used to provide an external clock signal, which

synchronizes the device.

AGND

Analog ground

VIN

DC input voltage

PGND

Power ground

L6981

Pin configuration

DS13554 - Rev 1

page 3/49

L6981 Datasheet(PDF) 3 Page - STMicroelectronics