Texas Instruments TPS71733DCKTG4

Overview

TPS71733DCKTG4 from Texas Instruments is a fixed-output, 3.3-V, 150-mA low-dropout linear regulator in a 5-pin SC-70 package. It delivers ultra-low noise (30 µV_RMS, 100 Hz–100 kHz), high PSRR (70 dB at 1 kHz), and low dropout (170 mV typical at 150 mA) for powering noise-sensitive analog and RF circuits in portable electronics.

For engineers reviewing the TPS71733DCKTG4 datasheet, TPS71733DCKTG4 pinout, TPS71733DCKTG4 application, or TPS71733DCKTG4 equivalent, key selection considerations include its 3.3-V fixed output, SC-70 footprint compatibility, 45-µA quiescent current, thermal shutdown protection, and stability with only 1-µF ceramic output capacitance.

Technical Context

The TPS71733DCKTG4 uses a PMOS pass device and advanced BiCMOS process to achieve fast startup, excellent transient response, and high PSRR across wide frequency range - 70 dB at 1 kHz, 67 dB at 100 kHz, and 45 dB at 1 MHz - under 1-V headroom (V_IN – V_OUT). Its precision voltage reference and feedback loop ensure ±3% worst-case output accuracy over load, line, temperature, and process variations.

It integrates active enable control (VEN(high) = 1.2 V min), undervoltage lockout (UVLO rising = 2.45 V), thermal shutdown (160°C trip), and internal current limiting (200–575 mA). The NR pin supports optional 0.01-µF noise reduction capacitor to lower output spectral noise density by up to 9×.

Key Specifications

Pinout & Package

TPS71733DCKTG4 is housed 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 (no PCB copper pour).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS71733DCKTG4, TPS71733DCKR offers identical performance in non-Pb-free packaging, while MCP1703T-3302E/MB trades noise, PSRR, and dropout for lower cost - making the TPS71733DCKTG4 optimal for RF/analog systems demanding lowest possible supply-induced jitter and distortion.

Availability

TPS71733DCKTG4 is available at Aetrix Electronics and suitable for camera sensor power, mobile RF front-end biasing, and industrial handheld scanner designs requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free compliance.

Supply support for TPS71733DCKTG4 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 connectivity technologies, with decades of LDO design expertise for high-reliability applications.

The TPS717 family was engineered specifically for ultra-low-noise, high-PSRR power delivery in space-constrained, battery-operated RF and imaging systems - prioritizing noise density, transient response, and thermal efficiency over raw current capability.

FAQ

What is the maximum input voltage for the TPS71733DCKTG4?

The TPS71733DCKTG4 supports an absolute maximum input voltage of 7 V, with recommended operating range from 2.5 V to 6.5 V. Operation above 6.5 V risks exceeding absolute maximum ratings and may trigger internal protection circuits or cause permanent damage. For reliable 3.3-V regulation, minimum input is 3.47 V (3.3 V + 170 mV dropout).

Does the TPS71733DCKTG4 require an external noise reduction capacitor?

The TPS71733DCKTG4 does not require an external noise reduction capacitor to function, but connecting a 0.01-µF ceramic capacitor between the NR pin and GND is necessary to achieve the specified 30 µV_RMS output noise. Without it, noise increases to ~95 × V_OUT µV_RMS (≈314 µV_RMS for 3.3 V), degrading performance in noise-sensitive applications like image sensors or RF synthesizers.

Can the TPS71733DCKTG4 be used with a 1-µF output capacitor?

Yes - the TPS71733DCKTG4 is explicitly designed to be stable with a minimum 1-µF ceramic output capacitor (X5R or X7R dielectric), unlike many older LDOs requiring ≥10 µF. This enables compact, low-BOM-count designs. Larger capacitors (up to 100 µF) improve load transient response but are not required for stability.

What is the enable threshold voltage for the TPS71733DCKTG4?

The TPS71733DCKTG4 enable pin (EN) has a guaranteed high-level threshold of ≥1.2 V (VEN(high)) and low-level threshold of ≤0.4 V (VEN(low)). It is compatible with standard 1.8-V and 3.3-V logic families. When EN is tied to VIN, the device powers on automatically once input exceeds 2.45 V (UVLO rising threshold), with no additional control logic needed.

How does thermal shutdown operate in the TPS71733DCKTG4?

The TPS71733DCKTG4 activates thermal shutdown at approximately 160°C junction temperature, disabling the output until the die cools to ~140°C. This hysteresis prevents oscillation during marginal thermal conditions. Continuous cycling indicates insufficient PCB copper area or excessive power dissipation - design margin should keep T_J ≤125°C under worst-case load and ambient conditions.