Texas Instruments TPS79928YZUT

Overview

TPS79928YZUT from Texas Instruments is a 200-mA, low-quiescent-current, ultralow-noise, high-PSRR low-dropout linear regulator in a 5-pin DSBGA package (1.34 mm × 0.97 mm), delivering fixed 2.8 V output with 2% total accuracy over –40°C to +125°C, 100 mV dropout at 200 mA, and 40 μA ground current - designed for powering noise-sensitive RF and precision analog circuitry in space-constrained portable devices.

For engineers reviewing the TPS79928YZUT datasheet, TPS79928YZUT pinout, TPS79928YZUT application, or TPS79928YZUT equivalent, key selection criteria include its 66 dB PSRR at 1 kHz, 10.5 × V_OUT μV_RMS output noise (with 0.01 μF NR capacitor), stable operation with ≥2 μF ceramic output capacitance, and inrush current protection during EN toggle startup.

Technical Context

The TPS79928YZUT employs a PMOS pass element and high-gain error amplifier to achieve ultralow dropout (100 mV at 200 mA) and high PSRR (66 dB @ 1 kHz, 51 dB @ 10 kHz) even at low headroom (VIN – VOUT = 0.25 V). Its internal 1.193-V bandgap reference and feedback loop ensure ±2% output accuracy across load (500 μA–200 mA), line (2.7–6.5 V), and temperature (–40°C to +125°C).

It integrates inrush current limiting activated on EN toggle, overshoot detection (5% threshold), thermal shutdown (165°C), undervoltage lockout (2.2 V typ), and a dedicated noise-reduction (NR) pin that bypasses bandgap noise when paired with a 0.01 μF capacitor - reducing total output noise to 29.4 μV_RMS at 2.8 V.

Key Specifications

Pinout & Package

TPS79928YZUT is housed in a 5-bump, thin, die-sized ball grid array (DSBGA) package measuring 1.34 mm × 0.97 mm with 0.4-mm pitch. This ultra-compact, low-profile package enables direct integration beneath RF modules and in stacked PCB architectures common in smartphones and wearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL720F2815PDBVR and LP5907MFX-2.8/NOPB, the TPS79928YZUT uniquely combines DSBGA size, NR pin capability, inrush limiting, and 66-dB PSRR - making it the only choice for miniaturized, high-performance RF power domains where all four features are mandatory.

Availability

TPS79928YZUT is available at Aetrix Electronics and suitable for wireless LAN transceivers, VCO power supplies, wearable health sensors, and smartphone camera modules requiring stable component supply across high-volume production and long-lifecycle designs.

Supply support for TPS79928YZUT 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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability solutions.

The TPS799 product line delivers ultralow-noise, high-PSRR LDOs optimized for RF, precision analog, and battery-powered portable electronics - targeting applications where supply integrity directly impacts signal fidelity and system-level performance.

FAQ

What is the maximum input voltage rating for the TPS79928YZUT?

The TPS79928YZUT has an absolute maximum input voltage of 7.0 V. However, its recommended operating input range is 2.7 V to 6.5 V. Operation above 6.5 V risks exceeding safe junction temperature or violating thermal limits, especially in the compact DSBGA package. Always ensure VIN ≤ 6.5 V in normal operation, and verify thermal design using RθJA = 143.3°C/W for the YZU package.

Does the TPS79928YZUT require an external noise-reduction capacitor to achieve its specified output noise?

Yes - the TPS79928YZUT achieves its lowest output noise (29.4 μV_RMS) only when a 0.01-μF ceramic capacitor is connected to the NR pin. Without this capacitor, output noise rises to ≈94 × V_OUT = 263.2 μV_RMS. The NR capacitor bypasses internal bandgap noise; omitting it degrades PSRR at high frequencies and increases integrated noise by >8×.

Can the TPS79928YZUT be used without connecting the EN pin?

Yes - the EN pin can be permanently tied to IN to enable continuous operation. When connected to VIN, the TPS79928YZUT powers up automatically with input application and remains active. This configuration disables shutdown control but simplifies design in always-on applications like sensor nodes or camera ISPs where dynamic power gating is unnecessary.

What is the minimum output capacitance required for stability with the TPS79928YZUT?

The TPS79928YZUT requires a minimum 2.2-μF ceramic output capacitor (X5R or X7R dielectric) placed close to the OUT and GND pins for guaranteed stability. Capacitance values below 2.2 μF risk oscillation or degraded transient response. Larger values (e.g., 10 μF) improve load transient suppression but do not harm stability - ESR must remain below 1.0 Ω.

How does the TPS79928YZUT handle output overshoot during enable transitions?

The TPS79928YZUT incorporates active overshoot detection: if V_OUT exceeds 2.8 V by ≥5% (≥2.94 V) during EN assertion, an internal pulldown device (≈350 Ω to GND) engages to clamp the output. This feature prevents voltage spikes that could damage downstream logic or cause false resets in connected processors - a key differentiator versus standard LDOs lacking such protection.