A5975AD datasheet(1/50 Pages) STMICROELECTRONICS

tên linh kiện	A5975AD

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April 2011

Doc ID 018761 Rev 1

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A5975AD

Up to 2.5 A step-down switching regulator

for automotive applications

Features

■ Qualified following the AEC-Q100

requirements (see PPAP for more details)

■ 2.5 A DC output current

■ Operating input voltage from 4 V to 36 V

■ 3.3 V / (±2%) reference voltage

■ Output voltage adjustable from 1.235 V to 35 V

■ Low dropout operation: 100% duty cycle

■ 500 kHz internally fixed frequency

■ Voltage feed-forward

■ Zero load current operation

■ Internal current limiting

■ Inhibit for zero current consumption

■ Synchronization

■ Protection against feedback disconnection

■ Thermal shutdown

Application

■ Dedicated to automotive applications

Description

The A5975AD is a step-down monolithic power

switching regulator with a minimum switch current

limit of 3.1 A, it is therefore able to deliver up to

2.5 A DC current to the load depending on the

application conditions. The output voltage can be

set from 1.235 V to 35 V. The high current level is

also achieved thanks to a HSOP8 package with

exposed frame, that allows to reduce the RTHJ-A

down to approximately 40 °C/W. The device uses

an internal P-channel DMOS transistor (with a

typical RDS(on) of 250 mΩ) as switching element

to minimize the size of the external components.

An internal oscillator fixes the switching frequency

at 500 kHz. Having a minimum input voltage of

only 4 V, it fits automotive applications requiring

device operation even in cold crank conditions.

Pulse-by-pulse current limit with the internal

frequency modulation offers an effective constant

current short-circuit protection.

HSOP8 - exposed pad

Figure 1.

Application schematic

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nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
STMicroelectronics	A5975D	1Mb / 50P	Voltage feed-forward 19-Apr-2011

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