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L4909

STMicroelectronics
Part Number L4909
Manufacturer STMicroelectronics
Description EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR
Published Mar 22, 2005
Detailed Description L4909 EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR s 3 OUTPUTS - Vo1 : output voltage variable from 5 to 12 V; limit c...
Datasheet PDF File L4909 PDF File

L4909
L4909

Overview
L4909 EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR s 3 OUTPUTS - Vo1 : output voltage variable from 5 to 12 V; limit current : 1.
2 A.
- Vo2 : output voltage variable from 5 to 12 V; limit current : 1.
2 A.
- Vo3 : output voltage variable from 5 to 12 V; limit current : 1.
2 A.
ENABLE INPUT FOR EACH REGULATOR FEEDBACK INPUT FOR EACH REGULATOR SHORT CIRCUIT PROTECTION TO GROUND OVERCURRENT WARNING DRIVER FOR EXTERNAL SCR (CROWBAR PROTECTION) THERMAL SHUTDOWN Each regulator is current limited and furthermore an OR-ed warning signal is output (open collector, active low output) when the current in a regulator goes above an over-current threshold (1 A typ for any regulator).
When one output voltage is higher than 20% typ of its nominal value (for instance in case of input-to-output short circuit), the crowbar output pin is activated, triggering an external SCR (connected between input and ground) that blows the input line fuse.
MULTIWATT 15 s s s s s s DESCRIPTION It is a monolithic Multifunction Voltage Regulator; it contains 3 regulators, (REG1, REG2, REG3) each one with an enable input and a feedback input, to allow the voltage setting via external resistive divider.
BLOCK DIAGRAM REF THERMAL SHUTDOWN EN1 EN2 EN3 6 7 9 + ENABLE CONTROL + REFERENCE GENERATOR REG1 REG2 REG3 + REF+20% + 3,13 + VINA, VINB + REG1 - 2 1 + VO1 FB1 OC 5 OVER CURRENT CHECK 4 + REG2 - 14 15 + + VO2 FB2 TRIG + REG3 GND 8 + - 11 10 VO3 FB3 D00AU1171 May 2000 1/7 L4909 PIN CONNECTION 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 FB2 VO2 VINB N.
C.
VO3 FB3 EN3 GND EN2 EN1 OC TRIG VINA VO1 FB1 TAB CONNECTED TO PIN 8 D00AU1153 Table 1.
Pin Description No.
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Name FB1 Vo1 VinA TRIG OC EN1 EN2 GND EN3 FB3 Vo3 N.
C.
VinB Vo2 FB2 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 ...


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