Texas Instruments LP5952LC-1.3/NOPB

Overview

LP5952LC-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) feeds the pass device - with VIN strictly ≤ VBATT. It targets Li-Ion or 3-cell NiMH/NiCd battery applications requiring low dropout, fast transient response (±15 mV load step), and ultra-low quiescent current (50 µA from VBATT, 10 µA from VIN).

For engineers reviewing the LP5952LC-1.3/NOPB datasheet, LP5952LC-1.3/NOPB pinout, LP5952LC-1.3/NOPB application, or LP5952LC-1.3/NOPB equivalent, key selection considerations include dual-supply sequencing constraints, 1.3 V fixed-output stability under no-load conditions, dropout voltage of 1.07 V (DSBGA) at 350 mA, thermal shutdown at 165°C, and compatibility with 2.2 µF ceramic output capacitance.

Technical Context

The LP5952LC-1.3/NOPB implements an NFET-based pass architecture with separate bias (VBATT) and power input (VIN) rails, enforcing strict VIN ≤ VBATT operation to prevent latch-up or overstress. Its internal reference and error amplifier maintain regulation across –40°C to +125°C junction temperature, with integrated thermal shutdown (165°C trip, 20°C hysteresis) and short-circuit current limiting.

It features dual-path power supply rejection: >90 dB PSRR at 100 Hz on VIN and >65 dB on VBATT, enabling clean regulation despite noisy DC-DC pre-regulator outputs or fluctuating battery voltage. Startup time is 70–150 µs, and reverse current protection relies on external Schottky diode if VOUT exceeds VIN by >50 mA.

Key Specifications

Pinout & Package

The LP5952LC-1.3/NOPB is packaged in a 5-pin DSBGA (YZR) with 1.326 mm × 0.96 mm body size. Pin assignment is validated per TI SNVS469F Rev F: BATT (C1), GND (B2), IN (A1), OUT (A3), EN (C3). NC pin is absent in this variant - all five pins are functional.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGEDR and TPS7A1633DRBR, the LP5952LC-1.3/NOPB uniquely delivers fixed 1.3 V regulation from dual independent rails with 350 mA capacity, making it irreplaceable for post-DC-DC ultralow-voltage applications where supply separation, dropout, and noise performance are critical.

Availability

LP5952LC-1.3/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable medical monitors, handheld scanners, and battery-powered sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LP5952LC-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 specializing in analog, embedded processing, and power management technologies, with leadership in precision analog and low-power design.

The LP5952LC-1.3/NOPB belongs to TI's LP59xx dual-rail LDO family, engineered specifically for ultralow-voltage post-regulation in space-constrained, battery-operated devices where traditional single-rail LDOs cannot meet input voltage requirements.

FAQ

What is the correct power supply sequencing for LP5952LC-1.3/NOPB?

The LP5952LC-1.3/NOPB requires VBATT ≥ VIN at all times - VIN must never exceed VBATT. In typical post-regulator use, VBATT powers both the upstream DC-DC converter and the LP5952LC-1.3/NOPB, ensuring natural ramp-up ordering. If supplies are independent, hardware interlocks or sequencing controllers must enforce this constraint to avoid damage or malfunction of the LP5952LC-1.3/NOPB.

Can LP5952LC-1.3/NOPB operate with no load connected to its output?

Yes, the LP5952LC-1.3/NOPB remains stable and in regulation with zero output current - a verified feature critical for applications like CMOS RAM keep-alive or always-on real-time clocks. This behavior is specified across the full –40°C to +125°C temperature range and does not require minimum load resistors or dummy loads to maintain regulation.

What output capacitor is required for stable operation of LP5952LC-1.3/NOPB?

The LP5952LC-1.3/NOPB requires a 2.2 µF ceramic output capacitor with ESR between 3 mΩ and 300 mΩ for guaranteed stability and optimal transient response. X7R dielectric is recommended; X5R may be used with derating. Capacitor tolerance must be ≥30% over temperature and DC bias to ensure minimum capacitance is maintained under all operating conditions.

Does LP5952LC-1.3/NOPB provide reverse current protection?

The LP5952LC-1.3/NOPB contains no active reverse current blocking. Its NFET pass device has a parasitic body diode that conducts if VOUT exceeds VIN. Up to 50 mA reverse current is tolerable; beyond that, an external Schottky diode (cathode on VIN, anode on VOUT) is mandatory to prevent uncontrolled current flow and potential damage to upstream circuitry or the LP5952LC-1.3/NOPB itself.

What is the thermal shutdown behavior of LP5952LC-1.3/NOPB?

The LP5952LC-1.3/NOPB triggers thermal shutdown at 165°C (typical) junction temperature and re-enables at 145°C (20°C hysteresis). During continuous overload, this results in pulsed output voltage - not latched-off behavior - allowing self-cooling cycles. For reliable continuous operation, design must limit power dissipation to keep TJ ≤ 125°C, using RθJA = 181.0°C/W (DSBGA) and appropriate PCB copper area.