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L4909 (IC942) : Regulator
1. Pin layout
1
2
3
4
2. Block diagram
SHUTDOWN
6
EN1
7
EN2
9
EN3
5
OC
4
TRIG
8
GND
3. Pin functions
Pin No.
Symbol
1
FB1
2
VO1
3
VINA
4
TRIG
5
OC
6
EN1
7
EN2
8
GND
9
EN3
10
FB3
11
VO3
12
N.C.
13
VINB
14
VO2
15
FB2
5
6
7
8
9 10 11 12 13 14 15
THERMAL
REFERENCE
GENERATOR
REG1
ENABLE
REG2
CONTROL
REG3
OVER
CURRENT
CHECK
Function
REG1 feedback voltage input
REG1 output voltage
Input DC supply voltage
Trigger for external SCR (crowbar protection)
Over current warning output
REG1 enable input
REG2 enable input
Analog ground
REG3 enable input
REG3 feedback voltage input
REG3 output voltage
Not connected
Input DC supply voltage
REG2 output voltage
REG2 feedback voltage input
REF
REF+20%
3,13
REG1
REG2
REG3
UX-L40/UX-L30
VINA
VINB
2
VO1
1
FB1
14
VO2
15
FB2
11
VO3
10
FB3
1-33
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