Texas Instruments TPS71733DSET

Overview

TPS71733DSET from Texas Instruments is a fixed-output, 3.3 V, 150-mA low-dropout linear regulator with ultra-high PSRR (70 dB at 1 kHz), 30 μV_RMS output noise (100 Hz–100 kHz), and 170 mV typical dropout at full load - designed for noise-sensitive analog and RF power rails in portable electronics.

For engineers reviewing the TPS71733DSET datasheet, TPS71733DSET pinout, TPS71733DSET application, or TPS71733DSET equivalent, key selection criteria include its SC-70-5 package footprint, enable-controlled standby mode (2.5 μA shutdown current), 1-μF ceramic output capacitor stability, and noise reduction (NR) pin compatibility with 0.01 μF bypass capacitors to achieve sub-15 μV_RMS noise performance.

Technical Context

The TPS71733DSET employs a PMOS pass device and high-gain BiCMOS error amplifier to deliver fast transient response and maintain high PSRR (>67 dB up to 100 kHz) even under low headroom conditions (VIN – VOUT = 0.5 V). Its quick-start circuit charges the NR capacitor within 160 μs, enabling rapid power-up while preserving low-noise operation.

It integrates undervoltage lockout (UVLO) with 2.45 V rising threshold and 150 mV hysteresis, thermal shutdown at 160°C (re-enable at 140°C), and internal current limiting (200–575 mA). The device operates across –40°C to 125°C junction temperature and achieves ±3% output accuracy over line, load, and temperature.

Key Specifications

Pinout & Package

TPS71733DSET is packaged in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained portable designs. Thermal performance is characterized by R_θJA = 279.2°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS71733DSET, TPS7A0533PDBVR offers lower quiescent current but sacrifices PSRR bandwidth and noise performance, while MCP1700T-3302E/MB provides higher current headroom at the expense of dropout voltage, noise, and transient response - making TPS71733DSET optimal for RF/analog signal chain power where noise and PSRR are design-critical.

Availability

TPS71733DSET is available at Aetrix Electronics and suitable for camera modules, mobile handset power management, and wireless transceiver biasing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS71733DSET 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 and embedded processing technologies, with decades of expertise in precision power management ICs.

The TPS717 family was engineered specifically for noise-sensitive, space-constrained portable applications - delivering high PSRR, ultra-low noise, and minimal quiescent current in sub-2 mm² packages.

FAQ

What is the minimum input voltage required for TPS71733DSET to regulate 3.3 V output?

The TPS71733DSET requires VIN ≥ VOUT + VDO = 3.3 V + 0.17 V = 3.47 V minimum under 150 mA load. However, per datasheet recommended operating conditions, the absolute minimum input is 2.5 V - meaning it will not regulate at 3.3 V below that threshold. At light loads, dropout drops further, enabling operation down to ~3.35 V input.

Can TPS71733DSET operate without the noise reduction (NR) capacitor?

Yes, TPS71733DSET functions without the NR capacitor, but output noise increases significantly: from 30 μV_RMS (with 0.01 μF) to ~95×VOUT ≈ 314 μV_RMS. The NR pin is internally connected to the bandgap reference; omitting the capacitor degrades PSRR above 10 kHz and compromises noise-sensitive applications like RF synthesizers.

Is TPS71733DSET stable with a 1-μF X5R ceramic capacitor?

Yes - the TPS71733DSET is explicitly characterized and guaranteed stable with ≥1 μF ceramic output capacitance (X5R/X7R dielectrics). Unlike many older LDOs, it does not require ESR damping or larger tantalum capacitors. The 1-μF value also satisfies the minimum requirement for fast load transient response and startup behavior.

What happens to TPS71733DSET output during thermal shutdown?

When junction temperature reaches ~160°C, TPS71733DSET disables the output and enters thermal shutdown. Output voltage drops to near 0 V while ground current remains ~100 μA. Once junction temperature cools to ~140°C, regulation automatically resumes - cycling may occur if power dissipation and ambient conditions exceed safe limits.

Does TPS71733DSET support reverse current protection?

No - the TPS71733DSET's PMOS pass transistor includes an intrinsic body diode that conducts when VOUT > VIN. During reverse voltage conditions (e.g., hot-swap or backup battery scenarios), uncontrolled reverse current flows. External reverse-blocking circuitry (e.g., series Schottky diode or ideal diode controller) is required for such use cases.