Texas Instruments LP5907UVX-3.2/NOPB

Introduction to the LP5907UVX-3.2/NOPB Ultra-Low Noise LDO Regulator

The LP5907UVX-3.2/NOPB by Texas Instruments is a precision fixed-output, low-dropout (LDO) linear regulator, designed specifically for noise-sensitive applications in compact electronics. Delivering a stabilized output voltage of 3.2V with up to 250mA load current, this device stands out for its low noise, high power supply rejection ratio (PSRR), and ultra-low quiescent current. Packaged in a miniature 4-bump DSBGA footprint, it is ideal where PCB real estate is at a premium. The LP5907UVX-3.2/NOPB is well-suited to power RF, analog, and digital circuits in equipment such as smartphones, tablets, communication modules, cameras, and industrial sensors.

Principal Attributes and Performance Summary of the LP5907UVX-3.2/NOPB

The LP5907UVX-3.2/NOPB leverages a host of advanced features aimed at optimal noise and power supply integrity:

Input voltage range: 2.2V to 5.5V, supporting a variety of common power rails.

Fixed 3.2V output with ±2% tolerance, ensuring stable downstream operation.

Output current capability up to 250mA.

Maximum dropout voltage of 0.2V at full load (typical 0.12V), beneficial for low-headroom designs.

Excellent PSRR: typically 82dB at 1kHz, crucial for noise-sensitive analog and RF components.

Ultra-low output voltage noise (less than 6.5μVRMS), achieved without the need for a separate noise bypass capacitor.

Very low quiescent current (Iq): 12μA typical during operation, 25μA maximum, which minimizes system standby losses.

On-chip protection for over temperature and short-circuit conditions.

Enable input with internal pull-down, supporting flexible system-level power management.

RoHS3 compliant, REACH unaffected, and rated to MSL 1 (unlimited floor life).

The device’s compact DSBGA package allows seamless integration in dense designs, while the option for remote output capacitor placement increases flexibility in system-level decoupling strategies.

Comprehensive Electrical Specifications of the LP5907UVX-3.2/NOPB

The regulator delivers a fixed output of 3.2V (±2%) up to 250mA. The input voltage must be at least VOUT + VDO (typically 3.32V), but the IC supports input voltages as high as 5.5V—accommodating Li-Ion battery rails, system buses, or other power domains commonly present in modern designs.

Key electrical highlights include:

Dropout voltage: 120mV typical at 250mA load, up to 200mV max.

PSRR: Maintains between 90dB and 60dB from 100Hz to 100kHz, effectively filtering out noise from most switching upstream supplies.

Output noise: Below 6.5μVRMS across 10Hz to 100kHz.

Load and line regulation: Integrated design ensures negligible deviations under dynamic supply or load transients.

No-load stability is guaranteed, maintaining regulation even with zero load.

Minimal input/output capacitor requirements: Stable operation with only 1μF X5R or X7R ceramic capacitors on input and output.

Integrated features such as thermal shutdown (with hysteresis), output discharge (via a 230Ω internal resistor when disabled), and a shutdown mode with Iq below 1μA, further enhance robustness and energy efficiency.

Operation Principles and Functionality of the LP5907UVX-3.2/NOPB

At the core of the LP5907UVX-3.2/NOPB's capabilities are its finely tuned low-noise architecture and flexible enable logic. Noise at the internal bandgap reference is minimized through an integrated low-pass RC filter (0.1Hz –3dB point), precluding the need for external bypass capacitors. The regulator incorporates an active-low enable pin, held low internally via a 1MΩ pull-down, ensuring the device is off and output is discharged unless asserted high. The output discharge path is automatically engaged when disabled, removing residual voltage on the output rail—a safety and power-down feature critical in hot-swappable or low-leakage systems.

The LP5907UVX-3.2/NOPB operates reliably across robust industrial temperature extremes (−40°C to +125°C junction) and remains stable with remote output capacitors placed up to 10cm from the device. There is no built-in UVLO circuitry; the device begins regulation once VIN reaches either 2.2V or VOUT + VDO, whichever is higher.

Implementation Recommendations for the LP5907UVX-3.2/NOPB in Contemporary Applications

The LP5907UVX-3.2/NOPB is purpose-built for high-performance, low-noise voltage sourcing in applications such as RF front ends, precision analog data converters, and timing circuits. For power supply engineers, its ability to deliver high PSRR and sub-7μV output noise without extra filtering makes it a top choice for sensitive analog and radio paths in smartphones, portable audio, and test equipment.

In board-level design, strict adherence to capacitor placement guidelines is key: the input capacitor should be within 1cm of the IC, with output capacitors allowed to be as far as 10cm away, granting flexibility in tight layouts as often encountered in compact consumer electronics. Both capacitors should be of X7R or X5R ceramic type for best stability and temperature performance. System integrators should evaluate thermal dissipation using the provided equations for power dissipation and maximum safe ambient temperature, especially in environments with elevated temperatures or limited airflow.

Tying the enable pin to system logic enables dynamic power sequencing. For always-on applications, connect EN directly to VIN.

PCB Design and Assembly Guidelines for the LP5907UVX-3.2/NOPB

To leverage the LP5907UVX-3.2/NOPB’s optimized transient and noise performance, layout must prioritize short, wide traces for input, output, and ground connections. Keep input and output capacitors on the same PCB side as the IC and as proximate as possible, especially for the input. Avoid narrow traces, excessive vias, and long routes, which add parasitic impedance and degrade noise and PSRR benefits.

DSBGA, X2SON, and SOT-23 packages are available; for DSBGA and X2SON, specialized assembly techniques are recommended. Thermal pads, where present, should be well soldered to maximize heat flow. Light sensitivity is a consideration for DSBGA packages—minimize exposure to direct halogen, red, or IR light during both assembly and operation.

LP5907UVX-3.2/NOPB Package Details and Installation Methods

The LP5907UVX-3.2/NOPB is fabricated in a 4-pin DSBGA (0.445mm–0.495mm max height), with other variants offered in X2SON (0.4mm max height) and SOT-23-5 outlines for higher compatibility. These minuscule packages are specifically optimized for phones, wearables, or sensor modules where board area comes at a premium. Standard tape-and-reel configurations simplify automated placement and high-volume manufacturing.

All versions are RoHS3 compliant, with a moisture sensitivity level (MSL) rating of 1. Mechanical, land pattern, and assembly stencil designs are available through Texas Instruments literature for each package, supporting rapid integration into modern electronic assembly lines.

Alternative or Substitute Devices for the LP5907UVX-3.2/NOPB

While the LP5907UVX-3.2/NOPB sets the bar for low-noise regulation, engineers may consider the following alternatives to match system requirements or sourcing constraints:

Texas Instruments TPS7A20: A modern LDO offering similar high PSRR, low noise, and improved feature set for updated system designs. Refer to the TPS7A20 datasheet for electrical compatibility and migration guidance.

Texas Instruments LP5907-Q1: An automotive-qualified version, suitable for harsh environments and providing the same electrical performance as the standard LP5907 family, but with AEC-Q100 qualification.

When selecting an equivalent or replacement, verify output voltage, current, dropout, noise, package, and qualification to ensure seamless system operation and supply chain reliability.

Conclusion

The Texas Instruments LP5907UVX-3.2/NOPB is a standout solution for engineers and purchasers seeking a proven, low-noise, high-PSRR 3.2V LDO regulator in a miniature footprint. Its combination of high electrical performance, robust protection, and ease of integration makes it particularly suited for next-generation consumer, industrial, and communication platforms. By adhering to recommended application and layout practices, the LP5907UVX-3.2/NOPB delivers stable, clean power vital for modern sensitive electronic systems, with alternative models available for expanded qualification needs or supply flexibility.