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April 2009 Doc ID 13959 Rev 5 1/12
12
A6902D
Up to 1 A step down switching regulator with adjustable
current limit for automotive applications
Features
■ Qualified following the AEC-Q100
requirements (see PPAP for more details)
■ Up to 1 A DC output current
■ Operating input voltage from 8 V to 36 V
■ Output voltage adjustable from 1.235 V to 35 V
■ Precise 3.3 V (±2 %) reference voltage
■ 250 kHz Internally fixed frequency
■ Voltage feedforward
■ Zero-load current operation
■ Internal current limiting
■ Protection against feedback disconnection
■ Thermal shutdown
Applications
■ Automotive applications
■ Adjustable current generator
■ Simple step-down converters with adjustable
current limit
SO-8
Figure 1. Application schematic
R1
5.6kO
R2
3.3kO
R3
5.1kO
Rsense
100mO
C1
10µF
35V
C2
22nF
C3
220pF
C4
100µF
10V
L1 22µH
D1
STPS340U
L6902D
V
CC
V
REF
COMP
GND
FB
OUT
CS+
CS-
V
IN
=8V to 36V
V
OUT
=3.3V
V
IN
=8V to 36V
R1
5.6kO
R2
3.3kO
R3
5.1kO
Rsense
100mO
C1
10µF
35V
C2
22nF
C3
220pF
C4
100µF
10V
L1 22µH
D1
STPS340U
L6902D
V
CC
V
REF
COMP
GND
FB
OUT
CS+
CS-
V
IN
=8V to 36V
V
OUT
=3.3V
V
IN
=8V to 36V
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