L6985F datasheet(1/65 Pages) STMICROELECTRONICS

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This is information on a product in full production.

February 2016

DocID027836 Rev 2

1/65

L6985F

38 V, 500 mA synchronous step-down switching regulator

with 30 µA quiescent current

Datasheet

- production data

Features

 0.5 A DC output current

 4 V to 38 V operating input voltage

 Low consumption mode or low noise mode

 30 µA IQ at light-load (LCM VOUT = 3.3 V)

 8 µA IQ-SHTDWN

 Output voltage adjustable from 0.85 V to VIN

 Adjustable fSW (250 kHz - 2 MHz)

 Embedded output voltage supervisor

 Synchronization

 Adjustable soft-start time

 Internal current limiting

 Overvoltage protection

 Output voltage sequencing

 Peak current mode architecture

 RDSON HS = 360 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 L6985F is a step-down monolithic switching

regulator able to deliver up to 0.5 A DC. The

output voltage adjustability ranges from 0.85V to

VIN. Thanks to the P-channel MOSFET high-side

power element, the device features 100% of the

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 the idle mode, so it maximizes the

efficiency at the light-load with the 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). The RST open collector

output can also implement output voltage

sequencing during the power-up phase. The

synchronous rectification, designed for high

efficiency at the 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 effective constant current protection.

HTSSOP16 (RTH = 40 °C/W)

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Số phần tương tự - L6985F

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STMicroelectronics	L6981	3Mb / 49P	38 V, 1.5 A synchronous step-down converter with low quiescent current 15-Jan-2020
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