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L1581D-2.5

ETC
Part Number L1581D-2.5
Manufacturer ETC
Description Dual Input Ultra Low Dropout Voltage Regulator (ULDO)
Published Mar 22, 2005
Detailed Description NIKO-SEM Dual Input Ultra Low Dropout Voltage Regulator (ULDO) FEATURES L1581 Series TO-252 GENERAL DESCRIPTION The L...
Datasheet PDF File L1581D-2.5 PDF File

L1581D-2.5
L1581D-2.5

Overview
NIKO-SEM Dual Input Ultra Low Dropout Voltage Regulator (ULDO) FEATURES L1581 Series TO-252 GENERAL DESCRIPTION The L1581 is a positive and very low dropout voltage regulator with 5A output current capability.
When supplying 2.
5V or 2.
8V on Motherboards or VGA Card where both 5V and 3.
3V supplies are available, the superior dropout characteristics of the L1581 result in reduced heat dissipation compared to regular LDOs, thus allowing heat sink reduction.
The adjustable version requires only two external resistors to set the output.
The L1581 features a low dropout of less than 600mV and offers fast transient response, remote sense, internal limiting, thermal shutdown and safe operating area protection of the output device.
The L1581 is a five terminal adjustable voltage regulator available in the popular 5 pin TO-252 packages.
z Low dropout voltage 600mV at rated load current z Remote sense operation z Fast transient response z 0.
5% voltage reference initial accuracy z Standard 5 terminal, Low cost TO-252 packages APPLICATIONS z 3.
3V to 2.
8V or 2.
5V for Motherboards or VGA Card z Spilt plane microprocessor supplies z Post regulator for switching supplies TYPICAL APPLICATION Adjustable Output Parts(2) L1581X Vin Vctrl 5 4 Vin ADJ CTR'L OUT SENSE 3 1 Vout 2 Vref R1 C1 330uF C2 10uF C3 0.
033uF R2 Iadj C4 330uF Vo = Vref (1+R2/R1) + Iadj x R2 1 OCT-11-Y02 NIKO-SEM Fixed Output Parts Dual Input Ultra Low Dropout Voltage Regulator (ULDO) L1581 Series TO-252 L1581X-2.
5 Vin Vctrl C1 330uF C2 10uF 5 4 Vin ADJ CTR'L OUT SENSE 3 2.
5V Vout 1 C4 330uF L1581X-3.
3 Vin Vctrl C1 330uF C2 10uF 5 4 Vin ADJ CTR'L OUT SENSE 3 3.
3V Vout 1 C4 330uF NOTES : (1) If the same voltage is input to both INPUT and CONTROL, then the dropout voltage will become 1.
3V maximum.
(2) A small (~0.
033uF) capacitor can be used to bypass the ADJUST pin to improve transient response, if needed.
(3) Capacitor values are for reference only.
Good quality, low ESR tantalum or aluminum electroly...


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