Texas Instruments TPS73534DRBT

Overview

TPS73534DRBT from Texas Instruments is a 500-mA, low-noise, high-PSRR, low-dropout linear regulator with fixed 3.4-V output, operating from 2.7 V to 6.5 V input. It delivers 2% output accuracy over load, line, and temperature (–40°C to +125°C), features 45 μA quiescent current, 280 mV dropout at 500 mA, and stable operation with a 2.2-μF ceramic output capacitor. It is used in IP network cameras and macro base stations for post-DC/DC ripple filtering.

For engineers reviewing the TPS73534DRBT datasheet, TPS73534DRBT pinout, TPS73534DRBT application, or TPS73534DRBT equivalent, key selection criteria include its 13.2 μV_RMS output noise, 68 dB PSRR at 1 kHz, fast 45-μs startup, WSON-6 package thermal performance (R_θJB = 34.7°C/W), and NR pin support for noise reduction via 10-nF feed-forward capacitor.

Technical Context

The TPS73534DRBT employs a PMOS pass transistor architecture enabling ultra-low dropout (280 mV at 500 mA) and high PSRR (68 dB @ 1 kHz) through a high-gain, high-bandwidth error amplifier. Its fixed-output variant integrates a dedicated NR pin for feed-forward noise suppression-bypassing internal bandgap reference noise-and includes a quick-start circuit to charge the NR capacitor during power-up.

It features active-high enable (EN) compatible with TTL/CMOS logic, thermal shutdown (165°C trip), undervoltage lockout (UVLO with 70-mV hysteresis), and internal current limiting (800–1900 mA). The device is fully specified across –40°C to +125°C junction temperature and uses BiCMOS process technology for precision and stability.

Key Specifications

Pinout & Package

TPS73534DRBT is housed in a 2-mm × 2-mm WSON-6 package with exposed thermal pad (DRV suffix), optimized for compact PCB layouts and efficient heat dissipation (R_θJB = 34.7°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO applications.

Compared with TPS73534DRBT, TPL73034PDBVR offers lower noise and IQ but reduced current capacity and no NR pin, while TPS7A2034PDQNR achieves dramatically lower IQ and smaller size at the cost of current limit and feature set-making TPS73534DRBT optimal for 500-mA, noise-sensitive, thermally demanding designs requiring enable and noise-reduction control.

Availability

TPS73534DRBT is available at Aetrix Electronics and suitable for IP network cameras, macro base stations, and thermostats requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.

Supply support for TPS73534DRBT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies, with decades of LDO design expertise and broad automotive, industrial, and communications product portfolios.

The TPS735 family was engineered for high-performance analog and RF systems requiring ultra-low noise, high PSRR, and low IQ in compact packages-targeting post-regulation of DC/DC outputs in infrastructure, imaging, and precision sensing applications.

FAQ

What is the maximum input voltage for the TPS73534DRBT?

The TPS73534DRBT supports an absolute maximum input voltage of 7 V, with recommended operation from 2.7 V to 6.5 V. Exceeding 7 V risks permanent damage per absolute maximum ratings. For reliable long-term use, maintain VIN ≤6.5 V and ensure proper input capacitance (0.1–1 μF ceramic) close to the IN pin to manage source impedance and transient spikes.

Does the TPS73534DRBT require an external capacitor on the NR pin?

The TPS73534DRBT includes an NR pin specifically for noise reduction, and while it functions without an external capacitor, adding a 10-nF ceramic capacitor (CNR) reduces output noise from 95×V_OUT to 11×V_OUT (13.2 μV_RMS). TI recommends COG/NPO dielectric for stability across temperature; omitting CNR increases RMS noise but retains full regulation functionality.

What is the thermal performance of the TPS73534DRBT in its WSON-6 package?

The TPS73534DRBT in the DRV (WSON-6) package has R_θJB = 34.7°C/W and R_θJA = 65.1°C/W under JEDEC-standard high-K board conditions. With the exposed thermal pad properly soldered to a PCB ground plane using a 2×2 thermal via array, it sustains 500 mA at +85°C ambient. Derating is required above 100°C board temperature per thermal simulation data in the datasheet.

Can the TPS73534DRBT be used without connecting the EN pin?

Yes-the EN pin of the TPS73534DRBT can be tied directly to the IN pin to permanently enable the regulator, eliminating external control logic. When left floating, EN may float to an indeterminate state causing erratic behavior; TI explicitly states that connecting EN to IN is acceptable if enable functionality is not needed, and the pin draws only 0.03–1 μA when enabled.

Is the TPS73534DRBT stable with ceramic output capacitors?

Yes-the TPS73534DRBT is explicitly designed and characterized for stability with ceramic output capacitors as low as 2.2 μF and low ESR. TI confirms stability across temperature and load with standard X5R/X7R ceramics; no series resistance or tantalum alternatives are required. This eliminates ESR-related compensation complexity and improves transient response versus electrolytic solutions.