A6902D Datasheet, PDF (1/12 Pages) STMicroelectronics – Up to 1A step down switching regulator with adjustable current limit for automotive applications

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
V_IN=8V to 36V
C1
10µF
35V
V_IN=8V to 36V
C3
220pF
V_CC
V_REF
COMP
C2
22nF
R3
5.1kO
L6902D
GND
OUT
CS+
CS-
FB
L1 22µH
D1
STPS340U
Rsense
100mO
November 2007
Rev 2
V_OUT=3.3V
R1
5.6kO
R2
3.3kO
C4
100µF
10V
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