Texas Instruments LP5952TLX-1.3/NOPB

Overview

LP5952TLX-1.3/NOPB from Texas Instruments is a dual-rail linear regulator designed for ultralow-voltage post-regulation in battery-powered systems, delivering a fixed 1.3 V output at up to 350 mA. It operates with two independent supply rails: VBATT (2.5–5.5 V) powers internal circuitry, while VIN (0.7–4.5 V) supplies the regulated output path. Its 100 µV_RMS output noise, ±1 mV line transient response, and 0.1 µA shutdown current make it suitable for powering sensitive RF or analog circuitry in mobile handsets.

For engineers reviewing the LP5952TLX-1.3/NOPB datasheet, LP5952TLX-1.3/NOPB pinout, LP5952TLX-1.3/NOPB application, or LP5952TLX-1.3/NOPB equivalent, key selection criteria include dual-supply rail compatibility, dropout voltage under 1.3 V at 350 mA, thermal shutdown at 165°C, PSRR >90 dB at 100 Hz on VIN, and DSBGA-5 package suitability for space-constrained portable designs.

Technical Context

The LP5952TLX-1.3/NOPB implements a dual-rail architecture where VBATT powers bias circuitry and VIN feeds the NFET pass device - VIN must never exceed VBATT. Its internal thermal shutdown triggers at 165°C (20°C hysteresis) and overcurrent protection limits peak output to 500 mA before thermal foldback engages.

It supports no-load stability and fast startup (70–150 µs), with reverse-current protection managed via the NFET's parasitic body diode - external Schottky clamping is required if VOUT exceeds VIN by more than ~0.3 V with >50 mA reverse current.

Key Specifications

Pinout & Package

LP5952TLX-1.3/NOPB is packaged in a 1.326 mm × 0.96 mm, 5-pin DSBGA (YZR) package with 0.4-mm pitch and bottom-side solder balls. The package is optimized for minimal PCB area and thermal performance in thin-profile handheld devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC7701QDCKR and TPS7A1633DRBR, LP5952TLX-1.3/NOPB uniquely supports true dual-rail operation with guaranteed VIN ≤ VBATT sequencing, enabling lower-system-noise architectures in battery-powered RF and precision analog applications where competing single-rail LDOs fail to meet supply-domain isolation requirements.

Availability

LP5952TLX-1.3/NOPB is available at Aetrix Electronics and suitable for mobile handsets, portable medical sensors, industrial scanners, and smart IoT edge nodes requiring stable component supply across long-lifecycle production programs.

Supply support for LP5952TLX-1.3/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 technologies for industrial, automotive, and consumer markets.

The LP5952 product line was developed specifically for ultralow-voltage dual-rail post-regulation in space-constrained, battery-powered portable electronics - targeting applications where traditional single-rail LDOs cannot meet simultaneous low-noise, low-dropout, and multi-supply sequencing demands.

FAQ

What is the maximum allowable voltage difference between VBATT and VIN for LP5952TLX-1.3/NOPB?

The LP5952TLX-1.3/NOPB requires VIN ≤ VBATT at all times. Absolute maximum ratings specify VBATT – VIN ≥ 0.2 V; exceeding this risks undefined behavior or damage. In practice, design margin should maintain VBATT ≥ VIN + 0.3 V across temperature and load to ensure reliable operation of the internal bias circuitry and pass device control loop. This constraint is fundamental to the dual-rail architecture of LP5952TLX-1.3/NOPB.

Can LP5952TLX-1.3/NOPB operate with no output load connected?

Yes, LP5952TLX-1.3/NOPB maintains regulation and stability with zero load current - a feature explicitly verified in its datasheet and critical for applications like RTC backup or memory keep-alive. Unlike many LDOs requiring minimum load for stability, LP5952TLX-1.3/NOPB uses an internal compensation scheme that ensures 1.3 V output accuracy and noise performance even under no-load conditions, eliminating the need for dummy resistors in LP5952TLX-1.3/NOPB designs.

What is the recommended output capacitor for LP5952TLX-1.3/NOPB and why?

TI specifies a 2.2 µF ceramic capacitor (X7R dielectric preferred) with ESR between 3 mΩ and 300 mΩ for LP5952TLX-1.3/NOPB. This value ensures phase margin >45° across –40°C to +125°C and load steps up to 350 mA. Smaller values risk instability; larger capacitances are acceptable but offer diminishing returns. The capacitor must be placed within 1 cm of the OUT and GND pins, directly on the bottom side of the DSBGA-5 package, to maintain LP5952TLX-1.3/NOPB's specified transient response and noise performance.

Does LP5952TLX-1.3/NOPB support reverse current protection without external components?

LP5952TLX-1.3/NOPB provides limited reverse current protection via the inherent parasitic body diode of its internal NFET. It safely conducts ≤50 mA from OUT to VIN if VOUT exceeds VIN. Beyond that threshold, uncontrolled reverse current can cause overheating or latch-up. Therefore, an external Schottky diode (cathode to VIN, anode to VOUT) is mandatory for applications where VOUT may rise above VIN - such as hot-swap or backup power scenarios - to protect LP5952TLX-1.3/NOPB and upstream circuitry.

How does the EN pin behavior affect system power sequencing for LP5952TLX-1.3/NOPB?

The EN pin of LP5952TLX-1.3/NOPB is active-high with VIH ≥1 V and VIL ≤0.4 V. When pulled low, LP5952TLX-1.3/NOPB enters shutdown, drawing only 0.1 µA from VBATT. To avoid floating states, TI mandates tying EN to VBATT if unused. During power-up, EN must be asserted only after both VBATT and VIN are stable - incorrect sequencing (e.g., EN high before VBATT reaches 2.5 V) may cause erratic startup or increased inrush in LP5952TLX-1.3/NOPB.