TPS73733DCQ 3.3V 1A Ultra-Low Noise (30μVRMS) LDO with High PSRR (75dB) 1% Accuracy Low Dropout (310mV) Enable Pin Stable with 1μF Ceramic Current/Thermal Protection in TO-263 Package

TPS73733DCQ 3.3V 1A Ultra-Low Noise (30μVRMS) LDO with High PSRR (75dB) 1% Accuracy Low Dropout (310mV) Enable Pin Stable with 1μF Ceramic Current/Thermal Protection in TO-263 Package

Features

• Stable with 1μF or larger ceramic output capacitor

• Input voltage range: 2.2V to 5.5V

• Ultra-low dropout voltage– Legacy silicon: 130mV typical at 1A– New silicon: 122mV typical at 1A

• Excellent load transient response—even with only 1μF output capacitor

• NMOS topology delivers low reverse leakage current

• Initial accuracy: 1%

• Overall accuracy over line, load, and temperature– Legacy silicon: 3%– New silicon: 1.5%

• Less than 20nA typical IQ in shutdown mode

• Thermal shutdown and current limit for fault protection

• Available in multiple output voltage versions:– Adjustable output: 1.20V to 5.5V– Custom outputs available using factory package-level programming

Applications

• Point-of-load regulation for DSPs, FPGAs, and microprocessors

• Post-regulation for switching supplies

• Portable and battery-powered equipment

Description

The TPS737 linear low-dropout (LDO) voltage regulator uses an NMOS pass transistor in a voltage follower configuration. This topology is relatively insensitive to the output capacitor value and ESR, allowing for a wide variety of load configurations. Load transient response is excellent, even with a small 1μF ceramic output capacitor. The NMOS topology also allows for very low dropout.

The TPS737 uses an advanced BiCMOS process to yield high precision while delivering very low dropout voltages and low ground pin current. Devices that use the latest manufacturing flow have an updated design with new silicon on the latest TI process technology. Current consumption, when not enabled, is less than 20nA and is designed for portable applications. This device is protected by thermal shutdown and foldback current limit.

For applications that require higher output voltage accuracy, consider TI's TPS7A37 1% overall accuracy, 1A low-dropout voltage regulator.

INFORMATION

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