Texas Instruments TPS79330YZQT

Summary of TPS79330YZQT Product

The TPS79330YZQT, manufactured by Texas Instruments, is a fixed-output, positive linear low-dropout (LDO) voltage regulator. It delivers a regulated 3V output at currents up to 200mA, packaged in a compact 5-pin DSBGA (NanoStar™ Wafer Chip Scale) format. Designed for sensitive RF and portable electronics, this LDO regulator stands out for its exceptional noise performance, high power supply rejection ratio (PSRR), and fast transient response, making it a robust solution for space-constrained applications.

Core Attributes and Advantages of TPS79330YZQT

The TPS79330YZQT boasts several features tailored for modern electronic systems:

Ultralow dropout voltage (112mV at 200mA output), vital for battery-powered designs seeking maximum utilization of battery life.

High PSRR (70dB at 10kHz), enabling effective attenuation of noise from less-than-ideal supply rails in sensitive analog and RF systems.

Ultralow noise operation (typical 32μV RMS at 2.8V variants) with support for noise reduction and feed-forward capacitors.

Minimal quiescent current (170μA typical), aiding in energy conservation for always-on or intermittent-operation devices.

Fast start-up time (approximately 50μs), critical for time-sensitive subsystems in fast-boot or wake-on-demand scenarios.

Robust protection mechanisms, including enable logic (shutdown control), undervoltage lockout (UVLO), foldback current limit, and thermal shutdown.

Stability with small ceramic output capacitors (2.2μF recommended), supporting miniature system designs and reliable performance across varying load and line conditions.

The combination of these features ensures that product selection engineers can confidently specify the TPS79330YZQT for demanding noise-sensitive and space-constrained RF platforms.

Common Usage Scenarios for TPS79330YZQT

The TPS79330YZQT is tailored for applications where low output noise, high PSRR, and energy efficiency are essential. Representative use-cases include:

RF front ends: Powering voltage-controlled oscillators (VCOs), receivers, and analog-to-digital converters (ADCs).

Battery-powered mobile devices: Cellular and cordless phones, Bluetooth® and Wireless LAN modules, PDAs, and handheld organizers.

Audio and high-performance analog systems: Supplying analog blocks where low noise is a critical specification.

The device’s flexibility and portfolio of fixed and adjustable output versions also allow system architects to optimize power rails for highly integrated mixed-signal SoCs.

Electrical Specifications and Thermal Properties of TPS79330YZQT

The electrical parameters of the TPS79330YZQT are characterized over the operating range of –40°C to 125°C junction temperature, with an input voltage of at least VOUT + 1V (minimum 2.7V). Key figures include:

Output voltage: Fixed at 3.0V (for TPS79330YZQT model).

Output current: Up to 200mA continuous, with overcurrent limitations protecting the system at approximately 400mA.

Dropout voltage: 112mV typical at 200mA load, ensuring regulation even as battery voltage decreases.

Quiescent current: 170μA typical, dropping below 1μA in standby mode via the enable pin.

PSRR: 70dB at 10kHz, essential for filtering noise in RF and mixed-signal domains.

Output voltage noise: Ultralow, particularly with appropriate noise-reduction capacitors; supporting clean power for analog blocks.

Thermal shutdown: Output is disabled at approximately 165°C junction temperature, with reactivation upon cooling to 140°C.

Engineers should verify that their input supply can accommodate input voltages from 2.7V to 5.5V to maintain optimum regulation and protection features. Power dissipation is primarily a function of output current and the difference between input and output voltages; thermal metrics and PCB layout strategies support effective heat management.

Operational Principles and Functional Modes of TPS79330YZQT

The TPS79330YZQT operates in several modes:

Normal Mode: The regulator provides the nominal output voltage when the input voltage exceeds dropout requirements, enable is asserted high, output current is below the current limit, and thermal limits are not exceeded.

Dropout Mode: If VIN drops below VOUT plus dropout voltage, the output tracks VIN minus the dropout figure; transient performance is diminished in this mode.

Shutdown Mode: The device enters an ultralow quiescent current state when the enable (EN) pin is low or if junction temperature exceeds the thermal threshold or VIN falls below UVLO limits.

Protection Features: Internal circuits safeguard the LDO and downstream electronics via undervoltage lockout, foldback current limit, and thermal shutdown. Reverse current from output to input is possible if VIN drops below VOUT, so if extended such operation is anticipated, external limiting is suggested.

The enable function supports power sequencing, and the proprietary BiCMOS architecture underpins the device’s low dropout and noise performance.

Design Integration and Circuit Recommendations for TPS79330YZQT

When designing with the TPS79330YZQT, engineers should:

Use low ESR ceramic capacitors (X7R/X5R recommended) at both input and output for optimal transient and noise performance. The minimum recommended output capacitor is 2.2μF; 4.7μF is preferred if feed-forward or noise-reduction capacitors are absent or for outputs below 1.8V.

Place a 0.1μF or higher input bypass capacitor as close to IN as possible.

Utilize the enable pin for shutdown, tying to VIN if not used.

For noise-sensitive applications, apply a low-leakage 0.01–0.1μF capacitor on the NR (noise reduction) pin.

Follow resistor selection guidelines for the adjustable variant, ensuring divider currents around 50μA, and add a feed-forward capacitor for enhanced stability and response.

A critical consideration is to keep all capacitors as close as possible to the regulator pins to minimize parasitic inductance and resistance, maximizing high-frequency PSRR and load response.

PCB Design Considerations and Power Supply Management for TPS79330YZQT

Good PCB layout is essential for LDO regulator function and end-product electromagnetic compatibility. Recommendations for the TPS79330YZQT include:

Minimize the distance between the input/output capacitors and the regulator.

Use solid ground planes and provide sufficient copper area around the package for heat dissipation.

Separate VIN and VOUT ground returns, connecting them only at the regulator’s GND pin, for best PSRR and noise metrics.

Avoid vias between the LDO and its passive components; place all passives on the same PCB side.

If high power dissipation is expected, reinforce heat management with heavier copper and consider airflow or additional heatsinking features.

Estimation of the junction temperature should be based on real-world PCB temperature measurements, using the provided ΨJT and ΨJB thermal coefficients for accurate thermal modeling.

Mechanical, Environmental, and Regulatory Information for TPS79330YZQT

The TPS79330YZQT is available in NanoStar wafer chip scale (YZQ) and SOT-23 package options, each designed for minimal PCB real estate and profile. These packages support industry-standard SMT assembly methods and are rated with Moisture Sensitivity Level 1 (unlimited shelf life at room temperature). Environmental compliance includes alignment with RoHS 3 directives and REACH, making the device suitable for global production and long-term supply assurance. For automotive-grade needs, the TPS793-Q1 variant is available, with enhanced qualification for high-reliability markets.

Development Tools and Evaluation Options for TPS79330YZQT

To accelerate design cycles and risk mitigation, Texas Instruments provides evaluation modules (EVMs) such as the TPS79330YEQEVM, SPICE simulation models, and application notes covering thermal considerations and feed-forward capacitor selection. EVMs and documentation support a fast start for both performance validation and design-in.

Alternative or Substitute Devices Comparable to TPS79330YZQT

When selecting an LDO for existing or new projects, engineers should evaluate alternatives such as:

Other TPS793 family members (e.g., TPS79328 for 2.8V rails, adjustable-output TPS79301).

Automotive-qualified TPS793-Q1.

Devices with similar footprint, voltage/current ratings, and noise/PSRR characteristics from the same or other suppliers, especially if supply constraints or obsolescence is a concern.

Critical selection parameters include output voltage, maximum output current, dropout voltage, noise specifications, PSRR, enable logic type, and package compatibility. It is recommended to validate form, fit, and function before transitioning to alternative models.

Conclusion

The Texas Instruments TPS79330YZQT is a high-performance, low-noise, fixed 3V 200mA LDO regulator that meets the stringent demands of modern RF, analog, and portable electronic applications. Its impressive PSRR, dropout, and noise metrics, coupled with robust protection and flexible implementation options, make it a preferred choice for product selection engineers and procurement specialists targeting leading-edge, reliable power solutions. With comprehensive resources and support, the TPS79330YZQT streamlines the design and qualification process, ensuring enduring value across a spectrum of technological platforms.