Datasheet Details
| Part number | L4909 |
|---|---|
| Manufacturer | STMicroelectronics |
| File Size | 61.54 KB |
| Description | EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR |
| Datasheet | L4909_STMicroelectronics.pdf |
|
|
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.
| Part number | L4909 |
|---|---|
| Manufacturer | STMicroelectronics |
| File Size | 61.54 KB |
| Description | EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR |
| Datasheet | L4909_STMicroelectronics.pdf |
|
|
|
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.
| Part Number | Description |
|---|---|
| L4901A | DUAL 5V REGULATOR WITH RESET |
| L4902A | DUAL 5V REGULATOR WITH RESET AND DISABLE |
| L4903 | DUAL 5V REGULATOR WITH RESET AND DISABLE FUNCTIONS |
| L4904A | DUAL 5V REGULATOR WITH RESET |
| L4915 | ADJUSTABLE VOLTAGE REGULATOR PLUS FILTER |
| L4916 | VOLTAGE REGULATOR PLUS FILTER |
| L4918 | VOLTAGE REGULATORS PLUS FILTER |
| L4920 | VERY LOWDROP ADJUSTABLE REGULATORS |
| L4921 | VERY LOWDROP ADJUSTABLE REGULATORS |
| L4922 | VERY LOW DROP REGULATOR WITH RESET |