Datasheet > L7987

L7987

更新时间： 2024-11-15 14:58:15

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		开关稳压器
页数	文件大小	规格书
37页	2393K
描述
具有可调电流限值的61 V 3 A异步降压开关稳压器

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L7987 数据手册

L7987

61 V 3 A asynchronous step-down switching regulator with

adjustable current limitation

Datasheet - production data

Description

The L7987 device is a step-down monolithic

switching regulator able to deliver up to 3 A DC.

The output voltage adjustability ranges from 0.8 V

to V . The wide input voltage range and the

HTSSOP16 (R_TH= 40 °C/W)

100% duty cycle capability meet the fail safe

specifications for industrial systems. The

embedded switchover feature on the V

BIAS

maximizes the efficiency at light load. The

Features

adjustable current limitation, designed to select

the inductor RMS current accordingly with the

nominal output current, and the high switching

frequency capability make the size of the

application compact. Pulse-by-pulse current

sensing with digital frequency foldback

 3 A DC output current

 4.5 V to 61 V operating input voltage

 R

= 250 m typ.

DS,ON

 Adjustable f

(250 kHz - 1.5 MHz)

implements an effective constant current

protection over the different application

 Low IQ-SHD (11 µA typ. from V )

conditions. The peak current foldback decreases

the stress of the power components in heavy

short-circuit condition. The PGOOD open

collector output can also implement output

voltage sequencing during the power-up phase.

Multiple devices can be synchronized sharing the

SYNCH pin to prevent beating noise in low noise

applications like sensors with A/D conversion.

 Low IQ (1 mA typ. - V 24 V - V

3.3 V)

OUT

 Output voltage adjustable from 0.8 V to V

 Synchronization

 Adjustable soft-start time

 Adjustable current limitation

 Low dropout operation (12 µs max.)

 V

improves efficiency at light load

BIAS

 PGOOD open collector output

 Output voltage sequencing

 Digital frequency foldback in short-circuit

 Peak current foldback in short-circuit

 Auto-recovery thermal shutdown

Applications

 Designed for 24 V bus

 Fail safe tolerant system

 Programmable logic controllers (PLCs)

March 2015

DocID025589 Rev 3

1/37

This is information on a product in full production.

www.st.com

12 3 4 5 6 7...37

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