Texas Instruments TPS79933YZUR

Overview

TPS79933YZUR from Texas Instruments is a 200-mA, fixed 3.3-V ultra-low-noise LDO regulator with 40 μA quiescent current, 100 mV dropout at full load, 66 dB PSRR at 1 kHz, and ±2% output accuracy over –40°C to +125°C - designed for powering noise-sensitive RF and analog circuitry in portable wireless systems.

For engineers reviewing the TPS79933YZUR datasheet, TPS79933YZUR pinout, TPS79933YZUR application, or TPS79933YZUR equivalent, this page delivers verified package mapping (5-bump DSBGA, 1.34 mm × 0.97 mm), confirmed pin functions (IN, OUT, GND, EN, NR), thermal performance (R_θJA = 143.3°C/W), and real-world design trade-offs between noise reduction (C_NR = 0.01 μF), startup time (50 μs), and stability with ≥2-μF ceramic output capacitance.

Technical Context

The TPS79933YZUR employs a PMOS pass element and precision 1.193-V bandgap reference to achieve tight regulation and low dropout. Its high-gain error amplifier enables 66 dB PSRR at 1 kHz and excellent line/load transient response, supported by an active pulldown circuit that engages on >5% output overshoot during enable.

Inrush current protection activates immediately upon EN toggle, clamping peak input current; the NR pin provides dedicated bypassing of bandgap noise, reducing output noise to 10.5 × V_OUT μV_RMS (10 Hz–100 kHz) when a 0.01-μF capacitor is used. UVLO ensures operation only above 1.9 V (with 70-mV hysteresis), and thermal shutdown triggers at 165°C.

Key Specifications

Pinout & Package

TPS79933YZUR is packaged in a 5-bump, die-sized DSBGA (YZU) measuring 1.34 mm × 0.97 mm with 0.5-mm ball pitch. This ultra-compact, low-profile package minimizes PCB area and thermal resistance (R_θJB = 84.7°C/W), making it ideal for space-constrained mobile and wearable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79933YZUR, TPS7A2033PDQNR offers lower quiescent current but sacrifices noise performance and package size, while MCP1700T-3302E/MB trades PSRR, dropout, and feature richness for cost and simplicity - making TPS79933YZUR the optimal choice for compact, high-fidelity RF/analog power delivery.

Availability

TPS79933YZUR is available at Aetrix Electronics and suitable for RF front-end modules, wearable sensor hubs, Bluetooth LE audio subsystems, and industrial edge nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS79933YZUR 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 and broad automotive/industrial qualification.

The TPS799 family was engineered specifically for ultra-low-noise, low-I_Q power delivery in portable RF and precision analog systems - emphasizing PSRR, dropout, and miniaturized packaging for next-generation wireless devices.

FAQ

What is the maximum input voltage rating for the TPS79933YZUR?

The TPS79933YZUR 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 YZU DSBGA package with R_θJA = 143.3°C/W. For reliable long-term use, keep VIN ≤ 6.5 V and ensure adequate PCB copper pour for heat dissipation.

Does the TPS79933YZUR require an external noise-reduction capacitor to meet datasheet noise specifications?

Yes - the TPS79933YZUR's specified output noise of 34.65 μV_RMS (10 Hz–100 kHz) assumes a 0.01-μF capacitor is connected to the NR pin. Without this capacitor, output noise rises to ~94 × V_OUT = 310.2 μV_RMS. The NR capacitor bypasses bandgap reference noise and improves PSRR; ceramic types with low leakage (e.g., X7R, C0G) are recommended.

Can the TPS79933YZUR operate with less than 2.2 μF output capacitance?

No - the TPS79933YZUR is only guaranteed stable with ≥2.2 μF total ceramic output capacitance (X5R/X7R, ESR < 1 Ω). Using smaller values risks oscillation or degraded transient response. While some designs may appear functional with 1-μF capacitors, TI's characterization and production testing validate stability exclusively at ≥2.2 μF, and deviation voids performance guarantees.

What is the thermal shutdown behavior of the TPS79933YZUR?

The TPS79933YZUR activates thermal shutdown at 165°C junction temperature and resets at 145°C (20°C hysteresis). During shutdown, the device disables the pass transistor and reduces ground current to ≤1 μA. It does not latch off - automatic recovery occurs once TJ falls below 145°C. This protects against sustained overload or poor heatsinking without requiring external reset circuitry.

Is the TPS79933YZUR pin-compatible with other packages in the TPS799 family?

No - the TPS79933YZUR uses the 5-bump YZU DSBGA package (1.34 mm × 0.97 mm), which has different ball layout and mounting requirements than the SOT-23-THIN (DDC) or WSON (DRV) variants. Pin functions (IN, OUT, GND, EN, NR) are identical, but physical placement, solder stencil design, and reflow profile must be validated separately for YZU. No mechanical or layout compatibility exists across packages.