Texas Instruments LP5952LCX-1.5/NOPB

Overview

LP5952LCX-1.5/NOPB from Texas Instruments is a dual-rail linear regulator designed for ultralow-voltage post-regulation in battery-powered systems. It accepts two independent supply rails-VBATT (2.5 V to 5.5 V) for bias and VIN (0.7 V to 4.5 V) for power input-and delivers a fixed 1.5 V output at up to 350 mA. Its key attributes include 100 µV_RMS output noise, ±1 mV line transient response, and 0.1 µA shutdown current, enabling use in mobile phones and portable instrumentation.

For engineers reviewing the LP5952LCX-1.5/NOPB datasheet, LP5952LCX-1.5/NOPB pinout, LP5952LCX-1.5/NOPB application, or LP5952LCX-1.5/NOPB equivalent, this page provides verified technical context, package-specific pin functions, real-world load/line transient behavior, thermal protection thresholds, and validated alternative options for dual-rail Li-Ion/NiMH-powered designs.

Technical Context

The LP5952LCX-1.5/NOPB implements a dual-supply architecture where VBATT powers internal circuitry (e.g., reference, error amplifier, enable logic) while VIN supplies the NFET pass device. VIN must never exceed VBATT-a hard constraint enforced by internal design and reflected in absolute maximum ratings (VBATT–VIN ≥ 0.2 V).

It features integrated thermal shutdown (165°C trip, 20°C hysteresis), short-circuit current limiting, and undervoltage lockout. The device remains stable with no external load and supports fast startup (70–150 µs) with controlled inrush current (120 mA typical into 2.2 µF C_OUT), making it suitable for keep-alive CMOS RAM and burst-mode RF subsystems.

Key Specifications

Pinout & Package

LP5952LCX-1.5/NOPB is packaged in a 5-pin DSBGA (YZR) with 1.326 mm × 0.96 mm body size. Pin 5 (NC) has no internal connection and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGEDR and TPS7A2015PDBVR, LP5952LCX-1.5/NOPB uniquely supports true dual-rail operation (VBATT + VIN), enabling stable 1.5 V regulation from inputs as low as 0.7 V while maintaining 100 µV_RMS noise and 0.1 µA shutdown-making it irreplaceable in Li-Ion post-regulation topologies.

Availability

LP5952LCX-1.5/NOPB is available at Aetrix Electronics and suitable for mobile phones, hand-held radios, and portable medical devices requiring stable component supply across extended temperature ranges (–40°C to +125°C).

Supply support for LP5952LCX-1.5/NOPB 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, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.

The LP5952 product line targets ultralow-voltage post-regulation in battery-powered portable electronics, specifically addressing the need for dual-rail LDOs that operate from sub-1 V inputs while maintaining low noise, fast transients, and robust protection.

FAQ

What is the absolute maximum voltage difference allowed between VBATT and IN pins on the LP5952LCX-1.5/NOPB?

The LP5952LCX-1.5/NOPB specifies an absolute maximum of 0.2 V for VBATT–IN. Exceeding this violates the device's internal design constraint that VIN must never exceed VBATT. This limit is enforced in the Absolute Maximum Ratings table and is critical to prevent damage to internal circuitry. Operation outside this margin voids reliability guarantees and may cause premature failure.

Can the LP5952LCX-1.5/NOPB be used with a 1.2 V input rail (VIN) while VBATT is at 3.6 V?

Yes-the LP5952LCX-1.5/NOPB supports VIN as low as 0.7 V when VBATT is ≥2.5 V. With VIN = 1.2 V and VBATT = 3.6 V, the device operates within its recommended conditions (VIN ≤ VBATT, VIN ≥ 0.7 V). Dropout is 128–250 mV at 350 mA, so 1.2 V input yields ~0.95–1.07 V headroom-sufficient for stable 1.5 V output under load.

Does the LP5952LCX-1.5/NOPB require external capacitors on both IN and OUT pins?

LP5952LCX-1.5/NOPB requires a 2.2 µF ceramic output capacitor (3–300 mΩ ESR) on OUT for stability. An input capacitor on IN is required only if used as a stand-alone regulator; it is omitted in typical post-regulation applications where the upstream DC-DC converter's output capacitor suffices-provided distance to IN is ≤5 cm and a solid ground plane exists.

What is the thermal shutdown behavior of the LP5952LCX-1.5/NOPB under continuous overload?

The LP5952LCX-1.5/NOPB triggers thermal shutdown at TJ = 165°C (typical) and re-enables at TJ = 145°C (20°C hysteresis). Under continuous overload, this results in pulsed output voltage-ON while cooling, OFF while heating-preventing permanent damage. Sustained operation above 125°C junction temperature degrades long-term reliability and is not recommended per datasheet limits.

Is the NC pin (Pin 5) on the LP5952LCX-1.5/NOPB DSBGA package electrically connected internally?

No-Pin 5 on the LP5952LCX-1.5/NOPB DSBGA (YZR) package is designated NC (No Connection) and has no internal electrical connection. It must remain unconnected on the PCB. Routing traces to or placing solder on this pad violates TI's layout guidance and may compromise thermal performance or mechanical reliability of the ultra-small 1.326 mm × 0.96 mm package.