Texas Instruments LP5900TLX-2.6/NOPB

LP5900TLX-2.6/NOPB Linear Regulator Product Summary

The LP5900TLX-2.6/NOPB from Texas Instruments is a high-performance, positive-output low dropout (LDO) linear regulator designed specifically to meet the stringent requirements of RF and analog circuitry. It delivers a fixed output voltage of 2.6V with output currents up to 150mA, encapsulated in an ultra-compact 4-bump DSBGA package measuring approximately 1mm x 1mm. This device stands out for its combination of ultra-low output noise, high power supply rejection ratio (PSRR), and minimal quiescent current, making it an attractive option for power-sensitive designs in compact form factors.

LP5900TLX-2.6/NOPB Major Attributes and Operational Benefits

The LP5900TLX-2.6/NOPB implements several advanced LDO technologies to streamline design effort and promote system robustness:

Wide Input Voltage Range: Accepts 2.5V to 5.5V, supporting standard battery architectures and regulated rails.

Low Output Voltage Noise: Generates only 6.5 μV RMS (typ.), ideal for noise-sensitive RF and analog sections.

High PSRR: 75 dB at 1 kHz, minimizing ripple and supply disturbances from upstream DC/DC converters or fluctuating sources.

Low Dropout Voltage: Typical dropout of 80 mV, critical for maximizing usable battery life in portable systems.

No External Noise Bypass Capacitor Required: Integrates a reference noise filter, further reducing board space and BOM count.

Extremely Low Quiescent Current: Consumes only 25 μA in enabled mode and typically less than 1 μA (shutdown), powering always-on or standby circuits efficiently.

Logic-Controlled Enable: ON/OFF control with internal pull-down resistor, simplifying MCU-driven sequencing and power management.

Comprehensive Protection: Features thermal-overload shutdown and short-circuit protection to prevent device/systems damage.

Output Voltage Tolerance: ±2%, supporting tight regulation needed by high-performance analog functions.

Rapid Startup: Enables output stabilization typically within 150 μs.

These integration choices simplify the BoM and strengthen system reliability, directly benefiting designs requiring high electromagnetic compatibility and phase noise performance.

LP5900TLX-2.6/NOPB Common Uses and Target Markets

The LP5900TLX-2.6/NOPB is optimized for applications where quiet supply rails are mandatory:

Cellular Phones: Essential for baseband, transceiver, or sensitive analog signal chains.

Wireless LAN Devices and Modules: Ensures RF power integrity for maximum sensitivity and minimum spurious emissions.

PDA Handsets and Ultra-Portable Devices: Helps economize board space and battery power while safeguarding critical analog areas.

These characteristics make the LP5900 series a frequent choice in compact, battery-powered products, especially where discrete analog sections coexist with high-current digital logic.

LP5900TLX-2.6/NOPB Technical Performance Parameters

For engineers evaluating device suitability, the LP5900TLX-2.6/NOPB presents the following salient specifications:

Maximum Output Current: 150mA continuous

Input Voltage Range: 2.5V to 5.5V

Output Voltage: 2.6V fixed, ±2% tolerance

Quiescent Current (Enabled/Disabled): 25 μA / <1 μA

Dropout Voltage: 80 mV (typical), defined as VIN VOUT at 100mA load and VOUT >2.5V

Output Noise: 6.5 μV RMS (10Hz–100kHz)

Power Supply Rejection Ratio: 75 dB (1 kHz)

Thermal Overload Protection: Output disables at ~160°C junction; re-enables at ~140°C

Short-Circuit Current Protection: Output current limited during faults

Stability: Maintains regulation, even at no load

Operating Junction Temperature Range: -40°C to +125°C

LP5900TLX-2.6/NOPB Application Integration and Design Recommendations

Implementing the LP5900TLX-2.6/NOPB in a design is straightforward, owing to its minimal external component count and robust stability characteristics. For stable operation, a 0.47 μF ceramic capacitor with X7R dielectric is required on both input and output rails. The device is tolerant to input and output ESR values ranging from 5 mΩ to 500 mΩ, lowering the risk of instability in varied layout or capacitor scenarios.

In portable RF or mixed-signal environments, tying the Enable pin to the system controller allows precise power gating. Careful attention should be paid to VIN > (VOUT + dropout); power supply margining should account for periods of battery droop or cold startup.

Thermal design is addressed by calculating maximum power dissipation via:

\( P_D = (V_{IN} V_{OUT}) \times I_{OUT} \)

Ensuring \( T_A = T_{JMAX} (\theta_{JA} \times P_D) \) remains within safe bounds, as specified by the package and board construction.

LP5900TLX-2.6/NOPB Power Supply Strategy and PCB Layout Tips

The LP5900TLX-2.6/NOPB is intended for use with well-regulated input rails between 2.5V and 5.5V. To ensure optimal PSRR and output quality, the input voltage should be at least 1V above the target output voltage.

PCB layout must minimize input and ground path impedance, especially in RF sections. The recommended placement includes situating bypass capacitance within 1 cm of the device pins, routed with direct, wide traces to reduce inductive or resistive drops.

Specific to the DSBGA package:

Avoid exposing the device to direct infrared or halogen light during operation, as the package is sensitive to such wavelengths.

Closely follow the manufacturer’s mounting guidelines to ensure mechanical integrity and heat dissipation; use recommended land patterns and pad dimensions for both DSBGA and WSON variants.

LP5900TLX-2.6/NOPB Package, Environmental, and Mechanical Information

The LP5900TLX-2.6/NOPB is supplied in a 4-bump DSBGA (YZR0004) package, with an ultra-small footprint for dense PCB layouts or chip-on-board solutions. The package features:

JEDEC Moisture Sensitivity Level (MSL): 1, unlimited shelf life under recommended storage

RoHS3 and REACH compliance: Free from restricted substances

Lead-free, halogen-free options available, suitable for high-volume consumer and medical use

Recommended land pattern and PCB footprint details are defined in Texas Instruments’ package documentation for proper solder reflow and system reliability

LP5900TLX-2.6/NOPB Alternative or Replacement Device Options

For design flexibility or future-proofing, engineers may consider alternate devices in the LP5900 family or similar LDO regulators:

Texas Instruments LP5900 Family: Other fixed output voltages (1.5V to 4.5V in 25mV increments) and package options are part of the same family, providing drop-in compatibility or minor schematic adjustments.

Texas Instruments TLV702 Series: Offers similar low-noise, low-dropout characteristics in SOT23 and other small-footprint packages. Be sure to verify output noise and PSRR versus application needs.

Texas Instruments TPS7A02: Ultra-low IQ, sub-μV noise, with a broader range of package and voltage options for advanced RF and analog rails.

When selecting alternatives, review precise output voltage, dropout, noise, PSRR, enable logic, and packaging to match the critical requirements of your design.

Conclusion

The Texas Instruments LP5900TLX-2.6/NOPB delivers industry-leading noise suppression, high PSRR, and efficient power management in an ultra-compact package, tailored for the demanding needs of RF and analog systems. Its engineering-enabled feature set reduces external parts count, maximizes supply integrity, and facilitates robust protection with minimal power overhead. Designed with integration, noise, and space considerations at the forefront, the LP5900TLX-2.6/NOPB represents a mature solution for modern handhelds, wireless modules, and ultra-sensitive analog domains. For product selection engineers and procurement specialists, the LP5900TLX-2.6/NOPB provides a dependable, scalable foundation for next-generation analog and RF power rails.