National Semiconductor LP3961 LP3964 800mA Fast Ultra Low Dropout Linear Regulators Data Sheet User Manual
Summary
These fast, ultra low-dropout linear regulators are designed to provide high-efficiency, reliable DC power for demanding electronics like microprocessors and DSPs. Capable of delivering up to 800mA, they ensure stable voltage with minimal dropout. The included manual serves as a comprehensive technical guide, detailing operational parameters, available packages (SOT-223, TO-263), detailed connection diagrams, and application advice for engineers building robust low-voltage power supplies.
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LP 3961/LP 800m Fast ltra Low ropout Linear egulators
LP3961/LP3964 800m A Fast Ultra Low Dropout Linear Regulators General Description Features
The LP3961/LP3964 series of fast ultra low-dropout linear Ultra low dropout voltage
regulators operate from +2.5V to +7.0V input supply. Wide Low ground pin current range of preset output voltage options are available. These Load regulation of 0.02% ultra low dropout linear regulators respond very fast to step
15µA quiescent current in shutdown mode
changes in load which makes them suitable for low voltage
Guaranteed output current of 0.8A DC
microprocessor applications. The LP3961/LP3964 are de-
Available in SOT-223,TO-263 and TO-220 packages
veloped on CMOS process which allows low quiescent
Output voltage accuracy 1.5%
current operation independent of output load current. This
Error flag indicates output status (LP3961)
CMOS process also allows the LP3961/LP3964 to operate
under extremely low dropout conditions. Sense option improves better load regulation (LP3964) Extremely low output capacitor requirements
Dropout Voltage: Ultra low dropout voltage; typically 24m V
at 80m A load current and 240m V at 800m A load current. Overtemperature/overcurrent protection −40˚C to +125˚C junction temperature range
Ground Pin Current: Typically 4m A at 800m A load current. Shutdown Mode: Typically 15µA quiescent current when
Applications
the shutdown pin is pulled low.
Microprocessor power supplies
Error Flag: Error flag goes low when the output voltage
drops 10% below nominal value (for LP3961). GTL, GTL+, BTL, and SSTL bus terminators Power supplies for DSPs
SENSE: Sense pin improves regulation at remote loads.
(For LP3964) SCSI terminator Post regulators
Precision Output Voltage: Multiple output voltage options
are available ranging from 1.2V to 5.0V and adjustable, with High efficiency linear regulators
guaranteed accuracy of ±1.5% at room temperature, and Battery chargers
±3.0% over all conditions varying line, load, and tempera- Other battery powered applications ture).
Typical Application Circuits
DS101129-1
Minimum output capacitance is µF to ensure stability over full load current range. More capacitance provides superior dynamic performance and additional stability margin. *SD and ERROR pins must be pulled high through 10kΩ pull-up resistor. Connect the ERROR pin to ground if this function is not used. See applications sec- tion for more information.
National Semiconductor Corporation DS101129 www.national.com
Page Summary Contents For National Semiconductor LP3961 LP3964 800mA Fast Ultra Low Dropout Linear Regulators Data Sheet User Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 21 |
| File Size | 366.01 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the minimum output capacitance required for stable operation?
A minimum of 10 μF is needed to ensure stability over the full load current range.
How does the Sense pin improve performance?
The sense pin improves better load regulation, especially under extremely low dropout conditions and at remote loads.
What must be done with the SD and ERROR pins if they are not in use?
The SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor.
Is this regulator suitable for critical life support applications?
No, National’s products are not authorized for use as critical components in life support systems without express written approval.