L6986TR datasheet(1/68 Pages) STMICROELECTRONICS

Part #	L6986TR

Description	38 V, 2 A synchronous step-down switching regulator with 30 A quiescent current

PDF	68 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 68 page

This is information on a product in full production.

August 2016

DocID025376 Rev 7

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L6986

38 V, 2 A synchronous step-down switching regulator with 30 μA

quiescent current

Datasheet

- production data

Features

 2 A DC output current

 4 V to 38 V operating input voltage

 Low consumption mode or low noise mode

 30 A IQ at light load (LCM VOUT = 3.3 V)

 8 A IQ-SHTDWN

 Adjustable fSW (250 kHz - 2 MHz)

 Output voltage adjustable from 0.85 V to VIN

 Embedded output voltage supervisor

 Synchronization

 Adjustable soft-start time

 Internal current limiting

 Overvoltage protection

 Output voltage sequencing

 Peak current mode architecture

 RDSON HS = 180 m, RDSON LS = 150 m

 Thermal shutdown

Applications

 Designed for 12 V and 24 V buses

 Programmable logic controllers (PLCs)

 Decentralized intelligent nodes

 Sensors and low noise applications (LNM)

Description

The L6986 device is a step-down monolithic

switching regulator able to deliver up to 2 A DC.

The output voltage adjustability ranges from

0.85 V to VIN. Thanks to the P-channel MOSFET

high-side power element, the device features

100% duty cycle operation. The wide input

voltage range meets the specification for the 5 V,

12 V and 24 V power supplies. The “Low

Consumption Mode” (LCM) is designed for

applications active during idle mode, so it

maximizes the efficiency at light load with

controlled output voltage ripple. The “Low Noise

Mode” (LNM) makes the switching frequency

constant overload current range, meeting the low

noise application specification. The output voltage

supervisor manages the reset phase for any

digital load (

µC, FPGA, etc.). The RST open

collector output can also implement output

voltage sequencing during the power-up phase.

The synchronous rectification, designed for high

efficiency at medium - heavy load, and the high

switching frequency capability make the size of

the application compact. Pulse by pulse current

sensing on both power elements implements an

effective constant current protection.

HTSSOP16 (RTH = 40 °C/W)

www.st.com

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