Texas Instruments LP5910-0.9YKAR

Overview

LP5910-0.9YKAR from Texas Instruments is a 300-mA, low-noise, low-I_Q LDO linear regulator with fixed 0.9-V output, designed for RF and analog power rails. It operates from 1.3 V to 3.3 V input, delivers ±2% output voltage tolerance, achieves 75 dB PSRR at 1 kHz, and maintains stability with only 1-µF ceramic input and output capacitors - no bypass capacitor required. It serves as a post-DC/DC regulator in mobile phone baseband or RF power supplies.

For engineers reviewing the LP5910-0.9YKAR datasheet, LP5910-0.9YKAR pinout, LP5910-0.9YKAR application, or LP5910-0.9YKAR equivalent, key selection criteria include ultra-low 12 µA no-load quiescent current, 12 µV_RMS output noise, reverse current protection, automatic output discharge, and compatibility with ultra-thin DSBGA packaging for space-constrained portable designs.

Technical Context

The LP5910-0.9YKAR employs an NMOS pass transistor architecture with internal bandgap reference and error amplifier, enabling fast line and load transient response (±45 mV under 10-µs 1–100 mA step) without external compensation. Its enable circuit integrates a 1-MΩ internal pulldown resistor and logic-level thresholds (V_IL = 0.3 V, V_IH = 1 V), supporting direct microcontroller GPIO control.

Thermal protection activates at 160°C junction temperature with 15°C hysteresis, and short-circuit current limiting caps output at 450 mA. Reverse current protection blocks IN-to-OUT conduction when V_IN < V_OUT, while the 160-Ω internal discharge FET ensures rapid turnoff (<200 µs) when EN is low.

Key Specifications

Pinout & Package

The LP5910-0.9YKAR uses the YKA package: a 4-pin, 0.742 mm × 0.742 mm ultra-thin DSBGA with bottom-side ball layout. This wafer-level chip-scale package enables minimal PCB footprint and high thermal performance in thin-profile portable assemblies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL710F10DRVT and MCP1700T-1002E/TT, the LP5910-0.9YKAR uniquely combines 300-mA drive, 0.9-V output, 12 µV_RMS noise, and 12 µA I_Q in a 0.74-mm DSBGA - making it the only option qualified for high-fidelity RF bias in miniaturized portable systems.

Availability

LP5910-0.9YKAR is available at Aetrix Electronics and suitable for mobile phones, wearable medical monitors, and VR/AR headsets requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for LP5910-0.9YKAR 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 and embedded processing technologies, with decades of LDO design heritage focused on power integrity and signal-chain performance.

The LP5910 product line targets ultra-low-noise, low-I_Q power regulation for RF, analog, and portable applications - specifically engineered to replace legacy LDOs requiring noise-bypass capacitors and larger footprints.

FAQ

What is the dropout voltage of the LP5910-0.9YKAR at full 300-mA load?

The LP5910-0.9YKAR dropout voltage is not explicitly specified for 0.9-V output in the datasheet, as the minimum operating input voltage is 1.3 V. For V_OUT = 0.9 V, the device requires at least 1.3 V input - implying a practical dropout of ≤400 mV. The datasheet guarantees 120–200 mV dropout for outputs ≥1.8 V, and the 0.9-V variant shares the same NMOS pass structure and thermal design, ensuring robust operation within its validated 1.3–3.3 V input range. LP5910-0.9YKAR maintains regulation under all recommended conditions without dropout-induced collapse.

Does the LP5910-0.9YKAR require an external noise-bypass capacitor?

No, the LP5910-0.9YKAR does not require an external noise-bypass capacitor. Its internal architecture achieves 12 µV_RMS output noise (10 Hz–100 kHz) without one - a key differentiator confirmed in the datasheet's Features and Detailed Description sections. This eliminates a common BOM item and PCB real estate requirement, simplifying design for space-constrained applications like earbuds and wearables. LP5910-0.9YKAR delivers this performance using only 1-µF ceramic input and output capacitors.

How does the enable pin (EN) function on the LP5910-0.9YKAR?

The EN pin on the LP5910-0.9YKAR is an active-high logic input with V_IH = 1 V (min) and V_IL = 0.3 V (max). It features an internal 1-MΩ pulldown resistor, ensuring the device defaults to OFF if the pin is left unconnected. When pulled high, the regulator turns on with 80–200 µs turnon time to 95% of 0.9 V. During disable, the internal 160-Ω discharge FET actively pulls OUT to GND. LP5910-0.9YKAR thus supports direct GPIO control and safe power sequencing without external pullup resistors.

Is the LP5910-0.9YKAR stable with 1-µF ceramic capacitors only?

Yes, the LP5910-0.9YKAR is fully characterized and guaranteed stable with 1-µF X7R ceramic capacitors on both input and output - no minimum ESR requirement or additional compensation needed. This is verified across temperature (–40°C to +125°C) and load (0–300 mA) per the datasheet's Electrical Characteristics and Layout Guidelines. The design eliminates reliance on tantalum or polymer capacitors, reducing cost and improving reliability. LP5910-0.9YKAR's stability margin is sufficient for production use with standard 0402/0201 MLCCs.

What thermal protection features does the LP5910-0.9YKAR include?

The LP5910-0.9YKAR integrates thermal shutdown that triggers at 160°C junction temperature (typical), with 15°C hysteresis to prevent oscillation. It also includes short-circuit current limiting (450 mA typical) and reverse current protection to block IN-to-OUT conduction. These features operate autonomously without external components. Under sustained overload, the device cycles between thermal shutdown and recovery until fault clears. LP5910-0.9YKAR's thermal metrics (R_θJA = 202.8°C/W for YKA) ensure safe operation in handheld enclosures with minimal copper area.