L4991, L4991TM1, L4992 Selling Leads, Datasheet
MFG:NS Package Cooled:QFN-8 D/C:NSC
MFG:NS Package Cooled:QFN-8 D/C:NSC
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PDF/DataSheet Download
Datasheet: L4901
File Size: 137029 KB
Manufacturer: STMICROELECTRONICS [STMicroelectronics]
Download : Click here to Download
PDF/DataSheet Download
Datasheet: L4901
File Size: 137029 KB
Manufacturer: STMICROELECTRONICS [STMicroelectronics]
Download : Click here to Download
PDF/DataSheet Download
Datasheet: L4992
File Size: 315649 KB
Manufacturer: STMicro
Download : Click here to Download
The L4992 is a sophisticated dual PWM stepdown controller and power monitor intended for Notebook computer and/or battery powered equipment. The device produces regulated +3.3V, +5.1V and 12V supplies for use in portable and PCMCIA applications.
The internal architecture allows to operate with minimum external components count. A very high switching frequency (200/300 KHz or externally synchronizable) optimizes their physical dimensions.
Synchronous rectification and pulse skipping mode for the buck sections optimise the overall efficiency over a wide load current range (96% efficiency @1A/5.1V and 93% efficiency @ 0.05A/5.1V.
The two high performance PWM controllers for +3.3V and +5.1V lines are monitored for overvoltage, undervoltage and overcurrent conditions. On detection of a fault, a POWER GOOD signal is generated and a specific shutdown procedure takes place to prevent physical damage and data corruption.
A disable function allows to manage the output power sections separately, optimising the quiescent consumption of the IC in stand-by conditions.
Symbol | Parameter |
Value |
Unit |
VIN | Power Supply Voltage on VIN |
0 to 25 |
V |
VI | Maximum Pin Voltage to Pins 1, 24, 25, 32 |
-0.5 to (VIN +5) |
V |
IIN | Input Current Except V13IN and VIN |
-1 to +1 |
mA |
IOUT | Output Current Digital Output |
-15 to +15 |
mA |
TJ | junction temperature |
-55 to +150 |