Texas Instruments LP5952TLX-1.6/NOPB

Overview

LP5952TLX-1.6/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 1.6 V output at up to 350 mA, with 100 µVRMS noise and ±15 mV load transient response. It is used in mobile phones and handheld radios where Li-Ion or 3-cell NiMH/NiCd batteries supply primary power.

For engineers reviewing the LP5952TLX-1.6/NOPB datasheet, LP5952TLX-1.6/NOPB pinout, LP5952TLX-1.6/NOPB application, or LP5952TLX-1.6/NOPB equivalent, key selection considerations include dual-supply rail compatibility, dropout voltage under 150 mV at 350 mA, shutdown current of 0.1 µA, thermal shutdown at 165°C, and USON-6 package suitability for space-constrained portable designs.

Technical Context

The LP5952TLX-1.6/NOPB implements an NFET-based pass architecture with separate VBATT and VIN inputs, requiring VIN ≤ VBATT at all times to prevent damage. Its internal protection includes thermal shutdown (165°C trip, 20°C hysteresis), short-circuit current limiting, and undervoltage lockout.

It operates across –40°C to +125°C junction temperature, supports fast startup (70–150 µs), and maintains stability without load-critical for CMOS RAM keep-alive circuits. The device achieves ±1 mV line transient response on VIN and ±15 mV on VBATT, enabled by optimized control loop design and low-ESR ceramic capacitor support (COUT = 2.2 µF, ESR ≤ 300 mΩ).

Key Specifications

Pinout & Package

LP5952TLX-1.6/NOPB is packaged in a 6-pin USON (NKH) package, 2.00 mm × 2.00 mm, 0.5 mm pitch, wettable flank, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F2BHTSA1 and TPS7A2016PDQNR, LP5952TLX-1.6/NOPB uniquely supports dual-rail operation with sub-150 mV dropout at 350 mA and battery-direct biasing-making it irreplaceable in space- and efficiency-critical portable post-regulation designs where VIN must remain strictly below VBATT.

Availability

LP5952TLX-1.6/NOPB is available at Aetrix Electronics and suitable for mobile phones, handheld radios, and portable medical devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for LP5952TLX-1.6/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, designing and manufacturing analog ICs, embedded processors, and system-on-chip solutions for industrial, automotive, and consumer markets.

The LP5952TLX-1.6/NOPB belongs to TI's precision low-dropout regulator product line, engineered specifically for ultralow-input-voltage post-regulation in battery-powered portable electronics-emphasizing dual-rail flexibility, nanoscale quiescent current, and robust transient performance.

FAQ

What is the maximum allowable voltage difference between VBATT and VIN for LP5952TLX-1.6/NOPB?

The LP5952TLX-1.6/NOPB datasheet specifies that VIN must never exceed VBATT. While no explicit maximum differential is stated, absolute maximum ratings limit VBATT-to-IN voltage to 0.2 V. Therefore, VIN must be ≤ VBATT at all times-with recommended margin of at least 0.1 V to ensure safe operation during transients. In practice, VIN is typically set to VOUT + 0.3 V (1.9 V), while VBATT ranges from 2.5 V to 5.5 V.

Can LP5952TLX-1.6/NOPB operate with no external load connected?

Yes, LP5952TLX-1.6/NOPB remains stable and in regulation with zero load current-a feature explicitly documented in the datasheet under "No-Load Stability." This behavior is critical for applications like CMOS RAM keep-alive circuits or always-on monitoring subsystems where the output may be idle for extended periods. No minimum load resistor is required.

What is the recommended output capacitor for LP5952TLX-1.6/NOPB and why?

The recommended output capacitor for LP5952TLX-1.6/NOPB is 2.2 µF X7R ceramic with ESR ≤ 300 mΩ, placed within 3 mm of the OUT pin. This value ensures stability across temperature and DC bias, meets transient response requirements (±15 mV), and aligns with TI's validated design in the typical application circuit. Lower capacitance (e.g., 1.5 µF) may suffice in some cases, but 2.2 µF provides margin for worst-case tolerance and aging.

Does LP5952TLX-1.6/NOPB require an input capacitor at the IN pin?

LP5952TLX-1.6/NOPB requires an input capacitor at IN only when used as a stand-alone regulator. In its intended post-regulation role-where IN is fed from a nearby DC-DC converter-the converter's output capacitor suffices if distance ≤5 cm and a solid ground plane exists. If separation exceeds 5 cm, a 1 µF ceramic capacitor is recommended at IN to maintain stability and transient immunity.

How does the enable pin (EN) function on LP5952TLX-1.6/NOPB, and what happens in shutdown mode?

The EN pin on LP5952TLX-1.6/NOPB is an active-high logic input: VIH ≥1 V enables regulation; VIL ≤0.4 V disables it. In shutdown mode (EN = low), LP5952TLX-1.6/NOPB turns off the pass FET, dropping output voltage to 0 V and reducing total supply current to 0.1 µA typical from both VBATT and VIN-ideal for ultra-low-power system sleep states. The EN pin must never float and should be tied to VBATT if always-on operation is needed.