Texas Instruments LP5952LC-1.3

Overview

LP5952LC-1.3 from Texas Instruments is a dual-rail linear regulator designed for ultralow-voltage post-regulation in battery-powered systems, accepting 0.7 V–4.5 V on VIN and 2.5 V–5.5 V on VBATT to deliver a fixed 1.3 V output at up to 350 mA. It features 100 µV_RMS output noise, ±1 mV line transient response, and 50 µA typical quiescent current from VBATT - enabling stable power for RF transceivers, PMIC core rails, and low-power microcontrollers in mobile handsets.

For engineers reviewing the LP5952LC-1.3 datasheet, LP5952LC-1.3 pinout, LP5952LC-1.3 application, or LP5952LC-1.3 equivalent, key selection criteria include dual-supply rail sequencing (VIN ≤ VBATT), dropout voltage under 1.3 V at 350 mA, thermal shutdown at 165°C, and compatibility with 2.2 µF ceramic output capacitance without external compensation.

Technical Context

The LP5952LC-1.3 implements a dual-bias architecture: VBATT powers internal control circuitry and protection logic, while VIN supplies the NFET pass device delivering regulated 1.3 V output. This separation enables operation from a single Li-Ion cell (2.7–4.2 V) or 3-cell NiMH/NiCd (3.6–4.5 V), with VIN sourced from an upstream DC-DC converter's output.

Its functional block includes integrated thermal-overload, overcurrent, and undervoltage protection; fast turn-on (70–150 µs startup time); and reverse-current path management via the NFET body diode - requiring external Schottky clamping only if output-to-input reverse bias exceeds 50 mA.

Key Specifications

Pinout & Package

LP5952LC-1.3 is available in a 5-pin DSBGA (YZR) package measuring 1.326 mm × 0.96 mm, optimized for space-constrained portable designs. The package uses bottom-side ball terminations and requires standard PCB reflow profiles per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-rail LDO applications.

Compared with TPL7407LDR and TPS7A1633DRBR, the LP5952LC-1.3 uniquely supports true dual-rail operation with independent VBATT and VIN inputs, fixed 1.3-V output, and sub-200-mV dropout at full load - making it irreplaceable in compact, battery-optimized 1.3-V power domains where noise, efficiency, and sequencing matter.

Availability

LP5952LC-1.3 is available at Aetrix Electronics and suitable for mobile handset power management, RF transceiver biasing, wearable sensor hubs, and industrial IoT edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LP5952LC-1.3 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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.

The LP5952LC-1.3 belongs to TI's precision low-dropout regulator product line, engineered specifically for ultralow-voltage post-regulation in space- and power-constrained portable electronics powered by single-cell batteries.

FAQ

What is the maximum allowable voltage difference between VIN and VBATT for LP5952LC-1.3?

The LP5952LC-1.3 requires VIN ≤ VBATT at all times. Absolute maximum ratings specify that the voltage difference (VBATT – VIN) must be ≥ 0 V, with no positive margin allowed. Exceeding this condition risks damage or undefined behavior. In practice, VIN should be maintained at least 0.1 V below VBATT to ensure safe margin during transients and tolerances.

Can LP5952LC-1.3 operate with zero load current while maintaining regulation?

Yes, the LP5952LC-1.3 remains stable and in regulation with no external load - a feature explicitly documented as "No-Load Stability" in the datasheet. This capability is essential for applications like CMOS RAM keep-alive circuits or always-on sensor monitoring where output current may drop to 0 mA between wake cycles.

What output capacitor value and type are required for stable operation of LP5952LC-1.3?

The LP5952LC-1.3 requires a 2.2 µF ceramic output capacitor with ESR between 3 mΩ and 300 mΩ. X7R dielectric is recommended; X5R, Y5V, or Z5U may be used if minimum capacitance (including DC bias and temperature derating) remains ≥1.5 µF. Tantalum capacitors are discouraged due to surge-current failure risk.

Does LP5952LC-1.3 provide reverse current protection?

The LP5952LC-1.3 does not include active reverse current blocking. Its internal NFET pass device has a parasitic body diode that conducts up to 50 mA from OUT to VIN if the output is pulled above the input. For reverse currents exceeding 50 mA, an external Schottky diode (cathode on VIN, anode on OUT) is mandatory to prevent backfeed and potential damage.

What is the thermal shutdown behavior of LP5952LC-1.3 under continuous overload?

When junction temperature reaches 165°C (typical), LP5952LC-1.3 triggers thermal shutdown, turning off the NFET pass device. It remains latched off until temperature falls by ~20°C (to ~145°C), then automatically resumes regulation. This hysteresis prevents oscillation and provides pulsed output during sustained overload - a fail-safe mechanism protecting both LP5952LC-1.3 and downstream circuitry.