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LT1963AEQ#PBF

1.5A low-noise LDO regulator, 40µVrms noise, 340mV dropout, 1.8-20V input, TSSOP-16

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Manufacturer Part：

LT1963AEQ#PBF

Package：

TSSOP-16 with exposed pad (5.0 x 6.4mm)

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Description

Product Overview

The LT1963AEQ#PBF from Analog Devices is a 1.5A low-noise LDO regulator with 340mV dropout voltage and 40µVrms output noise. Operating from 1.8V-20V input in a TSSOP-16 exposed-pad package, it delivers ultra-clean power for noise-sensitive RF and analog circuits.

Key Specifications

Output Current 1.5A
Input Voltage 1.8V – 20V
Dropout Voltage 340mV @1.5A
Output Noise 40µVrms
PSRR >60dB @1kHz
Quiescent Current 1mA
Shutdown Current 1µA
Operating Temperature -40°C to +125°C
Package TSSOP-16 (EQ suffix, exposed pad)

Features

  • 1.5A output with only 340mV dropout at full load
  • 40µVrms ultra-low output noise for RF/analog applications
  • >60dB PSRR at 1kHz for excellent supply rejection
  • 1.8V-20V wide input range for versatile system design
  • 1µA shutdown current for battery conservation
  • Fast transient response with ceramic output capacitors

Applications

  • RF power amplifier and transceiver supply
  • PLL, VCO, and frequency synthesizer clean power
  • High-speed ADC/DAC reference and analog supply
  • Post-regulation of switching converters for noise-sensitive loads

The LT1963AEQ#PBF from Analog Devices is a 1.5A low-noise LDO regulator designed for noise-sensitive RF and precision analog applications. With only 40µVrms output noise and >60dB PSRR at 1kHz, it provides an exceptionally clean power rail that eliminates the need for additional filtering. The 340mV dropout voltage at 1.5A allows efficient operation from a 3.3V input to a 2.5V output. The wide 1.8V-20V input range and stable operation with ceramic capacitors make it versatile for a wide range of post-regulation and noise-critical power supply applications.

The LT1963AEQ#PBF uses a single NPN pass transistor in an emitter-follower configuration with a high-gain error amplifier. The NPN pass element provides low output impedance and fast transient response, making the device inherently stable with ceramic output capacitors (unlike PMOS-pass LDOs that often require ESR). The error amplifier compares the feedback voltage with an internal bandgap reference, driving the base of the NPN pass transistor to maintain regulation. The noise performance is achieved through a low-noise bandgap reference with optional external capacitor filtering (BYP pin), which reduces reference noise to negligible levels. The 1mA quiescent current includes all internal bias and error amplifier current.

Pin Name Description
1-4 OUT Regulated output voltage
5 SENSE/ADJ Output sense or feedback (adjustable version)
6 BYP Noise reduction bypass capacitor
7 GND Ground
8 /SHDN Shutdown control (active low)
9 BIAS Bias supply for internal circuitry
10-13 IN Input supply (1.8-20V)
14-16 NC No connect
Pad GND Exposed thermal pad (GND)
  • RF power amplifier and transceiver clean supply regulation
  • PLL and VCO low-noise power rail for phase noise performance
  • High-speed ADC/DAC analog supply and voltage reference
  • Post-regulation of switching converters for noise-sensitive loads
Model Manufacturer Iout Noise Vdo
LT1963AEST#PBF ADI 1.5A 40µVrms 340mV
LT3042 ADI 200mA 0.8µVrms 350mV
TPS7A4700 TI 1A 3.8µVrms 200mV
ADM7150 ADI 800mA 1µVrms 400mV
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