LT1964EDD#PBF

Functions

1. Ultra-Low Dropout Voltage
   • Achieves a dropout voltage of just 120mV at 1A output current (typical), enabling efficient operation in low-input-voltage systems
   •  (e.g., single-cell lithium-ion batteries or 5V USB supplies).
   • Maintains regulation across a wide load range (0.1mA to 1A), ensuring stable output for both light-load standby modes and full-load operation.
2. High Output Accuracy
   • Provides tight output voltage tolerance (±1% at 25°C, ±2% over full temperature range), critical for precision analog/digital circuits, sensors, and data converters.
   • Fixed-output versions (e.g., 3.3V, 5V) and adjustable versions (via external resistors for 1.25V to 15V outputs) offer flexibility for diverse voltage requirements.
3. Low Quiescent Current
   • Draws only 40μA quiescent current (typical), minimizing power drain in battery-powered devices.
   • Features a shutdown pin with <1μA standby current for further power savings in low-power states (e.g., sleep modes in portable electronics).
4. Exceptional Noise Performance
   • Ultra-low input voltage noise (15μV RMS from 10Hz to 100kHz) and high PSRR (74dB at 1kHz), 
   • making it ideal for noise-sensitive applications like audio amplifiers, medical sensors, and high-speed data acquisition systems.
   • Requires only 10μF ceramic output capacitor (no low-ESR capacitor needed), simplifying the layout and reducing component costs.
5. Fast Transient Response
   • Integrates a patented transient feedback loop that reduces output voltage overshoot/undershoot during load transients
   •  (e.g., 10% to 90% load step), ensuring stable power delivery to fast-switching components like FPGAs or microprocessors.
6. Robust Protection Features
   • Overcurrent limiting: Prevents damage from short circuits or overloads by restricting output current.
   • Thermal shutdown: Automatically disables the regulator if junction temperature exceeds ~160°C, ensuring safe operation in high-temperature environments.
   • Reverse-battery protection (via optional external diode) for systems with unstable or reversed power inputs (e.g., automotive or industrial applications).
7. Wide Input Voltage Range
   • Supports input voltages from 2.8V to 20V, compatible with diverse power sources such as multi-cell batteries, regulated DC supplies, or automotive inputs.

Applications

1. High-Fidelity Audio Systems
   • Powers low-noise operational amplifiers, DACs, and headphone amplifiers in audiophile equipment, ensuring minimal noise interference for pristine sound quality.
   • Used in professional audio mixers, digital audio workstations (DAWs), and high-end speaker systems.
2. Medical and Scientific Instruments
   • Regulates power for sensitive analog front-ends in ECG/EEG machines, blood pressure monitors, and laboratory equipment (e.g., spectrometers), where low noise and precision are critical.
   • Ideal for battery-powered portable medical devices requiring long operational life.
3. Automotive and Industrial Electronics
   • Infotainment and ADAS: Provides clean power to radar modules, cameras, and in-cabin entertainment systems, ensuring robust performance in harsh automotive environments.
   • Industrial Controls: Powers microcontrollers, PLCs, and communication interfaces (e.g., CAN, Ethernet) in factory automation systems, resisting voltage transients and noise.
4. Portable and Wearable Devices
   • Smartwatches, fitness trackers, and handheld GPS units: Balances low power consumption, low dropout, and noise performance for efficient battery management.
   • Mobile accessories (e.g., USB-C dongles, wireless earbuds): Enables stable power delivery from low-input voltage sources like USB ports.
5. Test and Measurement Equipment
   • Powers precision reference voltages, analog-to-digital converters (ADCs), and signal conditioning circuits in oscilloscopes, data loggers, and calibration tools.
6. Aerospace and Defense
   • Provides reliable power regulation for avionics, missile systems, and ruggedized electronics, meeting demanding temperature and reliability requirements (-40°C to +125°C operation).

Key Specifications (Summary)

The LT1964EDD#PBFF stands out for its combination of ultra-low dropout, exceptional noise performance, a

nd fast transient response, making it a preferred choice for designers requiring high precision and reliability in power-critical applications. 

Its compact DFN package and robust protection features further enhance its suitability for space-constrained and harsh-environment designs.

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