Texas Instruments TPS79928DRVT

Overview

TPS79928DRVT from Texas Instruments is a 200-mA, low-quiescent-current, ultralow-noise, high-PSRR low-dropout linear regulator with fixed 2.8 V output, EN control, and inrush current protection. It delivers 2% overall accuracy across –40°C to +125°C, achieves 100 mV dropout at 200 mA, and maintains stability with ≥2-μF ceramic output capacitance - ideal for powering RF VCOs and precision analog circuitry in space-constrained portable devices.

For engineers reviewing the TPS79928DRVT datasheet, TPS79928DRVT pinout, TPS79928DRVT application, or TPS79928DRVT equivalent, key selection criteria include its 40 μA quiescent current, 66 dB PSRR at 1 kHz, 10.5 × V_OUT μV_RMS output noise (with CNR), 5-pin SOT-23-THIN package (2.90 mm × 1.60 mm), and compatibility with fast load transients in battery-powered wireless systems.

Technical Context

The TPS79928DRVT uses a PMOS pass element and high-gain error amplifier to achieve ultralow dropout (100 mV @ 200 mA) and high PSRR (66 dB @ 1 kHz, 51 dB @ 10 kHz) even at low headroom. Its noise-reduction (NR) pin accepts a 0.01-μF capacitor to bypass bandgap reference noise, reducing total output noise to 10.5 × V_OUT μV_RMS.

Inrush current protection activates immediately upon EN toggle, clamping startup current; overshoot detection engages a pulldown resistor if V_OUT exceeds nominal by >5%. Thermal shutdown (165°C) and UVLO (2.2 V turn-on, 70 mV hysteresis) ensure robust operation across industrial and extended temperature ranges.

Key Specifications

Pinout & Package

TPS79928DRVT is packaged in a 5-pin SOT-23-THIN (DDC) measuring 2.90 mm × 1.60 mm, with exposed pad not present. The package supports reflow soldering and offers thermal resistance R_θJA = 225.3°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS799285DRVT, TPS79928DRVT offers tighter alignment with 2.8 V I/O standards and identical thermal/footprint compatibility; versus MCP1700T-2802E/MB, it delivers 3.3× higher output current, 16× higher PSRR at 1 kHz, and integrated inrush/overshoot protection essential for RF and industrial applications.

Availability

TPS79928DRVT is available at Aetrix Electronics and suitable for RF front-end biasing, wearable sensor hubs, industrial edge node MCUs, VCO/PLL core supplies, and Bluetooth/Wi-Fi coexistence designs requiring stable component supply and long-term lifecycle support.

Supply support for TPS79928DRVT 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 innovation focused on power integrity and signal-chain performance.

The TPS799 product line was designed specifically for noise-sensitive RF and precision analog applications demanding ultralow noise, high PSRR, and minimal quiescent current in miniature packages - targeting wireless infrastructure, handheld devices, and industrial sensing.

FAQ

What is the minimum input voltage required for TPS79928DRVT to deliver full 200 mA output current?

The minimum input voltage is 2.9 V - calculated as V_OUT + V_DO = 2.8 V + 100 mV - per the datasheet's recommended operating conditions. At inputs below 2.9 V, output current capability degrades linearly with reduced headroom; operation below 2.7 V is prohibited per absolute maximum ratings.

Does TPS79928DRVT require an external noise-reduction capacitor to achieve its specified output noise performance?

Yes - the 10.5 × V_OUT μV_RMS (29.4 μV_RMS) noise figure is measured with a 0.01-μF capacitor on the NR pin. Without CNR, output noise rises to 94 × V_OUT μV_RMS (263.2 μV_RMS). TI specifies ceramic capacitors ≤0.01 μF for optimal noise reduction and fast start-up.

Can TPS79928DRVT be used without connecting the EN pin?

Yes - the EN pin may be tied directly to IN to permanently enable the device. This configuration eliminates external control but forfeits shutdown capability (I_SHDN = 0.15 μA) and inrush current protection, which only activates on EN toggle. For always-on applications with stable input, direct tie is valid and commonly implemented.

What is the thermal performance of TPS79928DRVT in the SOT-23-THIN package at 200 mA load?

In the DDC (SOT-23-THIN) package, TPS79928DRVT has R_θJA = 225.3°C/W. At 200 mA and 2.9 V input (100 mV dropout), power dissipation is 20 mW, resulting in ~4.5°C junction-to-ambient rise above ambient - well within safe operating limits even at +85°C ambient. No heatsink is required.

Is TPS79928DRVT compatible with ceramic output capacitors smaller than 2.2 μF?

No - the datasheet explicitly requires ≥2.2 μF ceramic output capacitance (X5R/X7R, ESR < 1 Ω) for guaranteed stability across –40°C to +125°C. Capacitors below this value risk oscillation or degraded transient response; 2.2 μF is the validated minimum, not a recommendation.