A6902D(2007) データシートの表示（PDF） - STMicroelectronics

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A6902D
(Rev.:2007)

Up to 1A step down switching regulator with adjustable current limit for automotive applications

STMicroelectronics 

A6902D

Up to 1A step down switching regulator with adjustable

current limit for automotive applications

Features

■ Qualified following the AEC-Q100

requirements (temperature Grade 3), see

PPAP for more details.

■ Temperature range -40°C to 85°C

■ Up to 1A DC output current

■ Operating input voltage from 8V to 36V

■ Output voltage adjustable from 1.235V to 35V

■ Precise 3.3V (±2%) reference voltage

■ 250kHz Internally fixed frequency

■ Voltage feedforward

■ Zero load current operation

■ Internal current limiting

■ Protection against feedback disconnection

■ Thermal shutdown

Applications

■ Dedicated to automotive applications

■ Adjustable current generator

■ Simple step-down converters with adjustable

current limit

SO-8

Description

The A6902D is a complete and simple step down

switching regulator with adjustable current limit,

capable to deliver up to 1A at output voltages from

1.2V to 35V. The internal robust P-channel DMOS

transistor with a typical of 250mΩ assures high

efficiency and a minimum dropout even at high

output current level. The internal fixed switching

frequency of 250kHz, and the SO-8 package pin

allow to built an ultra compact DC/ DC converter

with a minimum board space.

Figure 1. Typical application

VIN=8V to 36V

C1

10µF

35V

VIN=8V to 36V

C3

220pF

VCC

VREF

COMP

C2

22nF

R3

5.1kO

L6902D

GND

OUT

CS+

CS-

FB

L1 22µH

D1

STPS340U

Rsense

100mO

November 2007

Rev 2

VOUT=3.3V

R1

5.6kO

R2

3.3kO

C4

100µF

10V

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