Texas Instruments LP3892ES-1.5/NOPB

Overview

LP3892ES-1.5/NOPB from Texas Instruments is a 1.5A ultra-low-dropout linear regulator with CMOS N-MOS pass transistor architecture, delivering 1.5V fixed output voltage, 140 mV typical dropout at full load, ±1.5% output accuracy at 25°C, and 60 nA shutdown current. It operates from dual supplies (VIN and VBIAS), enabling stable regulation down to VIN = VOUT + VDO - ideal for post-regulation in high-efficiency power systems.

For engineers reviewing the LP3892ES-1.5/NOPB datasheet, LP3892ES-1.5/NOPB pinout, LP3892ES-1.5/NOPB application, or LP3892ES-1.5/NOPB equivalent, key selection criteria include its DDPAK/TO-263-5 package thermal performance, bias rail dependency (4.5–6V), fast transient response for DSP/microcontroller core rails, and absence of external compensation requirements.

Technical Context

The LP3892ES-1.5/NOPB uses a CMOS-based N-channel MOSFET pass element driven by an external VBIAS rail (4.5–6V), decoupling gate drive from VIN to enable ultra-low input voltage operation. Its control loop achieves wide bandwidth without requiring external compensation due to inherent stability with ≥10 µF output capacitance.

It integrates over-temperature and over-current protection, features active shutdown with 20 µs turn-off delay, and maintains 0.04%/A load regulation across 10 mA–1.5 A. Ground current remains low (3 mA typ at full load) and independent of output load - unlike bipolar LDOs - enabling high efficiency at light loads.

Key Specifications

Pinout & Package

LP3892ES-1.5/NOPB is housed in a thermally enhanced DDPAK/TO-263-5 (KTT) package with exposed thermal pad soldered to PCB copper for low junction-to-ambient resistance. The 5-pin configuration supports high-current delivery while minimizing board space.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout linear regulator applications.

Compared with TPS7A4701RGWR and MCP1826T-1502E/OT, LP3892ES-1.5/NOPB uniquely combines ultra-low dropout (140 mV), dual-rail flexibility, and robust thermal design in DDPAK - making it optimal for high-current, low-input-voltage, and high-temperature applications where alternatives require trade-offs in efficiency, size, or protection.

Availability

LP3892ES-1.5/NOPB is available at Aetrix Electronics and suitable for server core supplies, DSP power rails, and industrial microcontroller applications requiring stable component supply, long-term lifecycle support, and RoHS-exempt packaging for high-reliability deployments.

Supply support for LP3892ES-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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability linear regulation and thermal-aware power design.

The LP3892 family was engineered for high-current, fast-transient, ultra-low-dropout applications in computing, communications, and industrial systems - emphasizing thermal efficiency, bias-rail optimization, and integration of protection features without external components.

FAQ

What is the minimum input voltage required for LP3892ES-1.5/NOPB to regulate 1.5V output?

The LP3892ES-1.5/NOPB requires VIN ≥ (VOUT + VDO). With 140 mV typical dropout at 1.5A, minimum VIN is 1.64 V under full load. At lighter loads, dropout decreases - e.g., ~80 mV at 500 mA - allowing VIN as low as 1.58 V. Always verify against worst-case 320 mV max dropout in datasheet Section 6.5.

Can LP3892ES-1.5/NOPB operate without an external VBIAS supply?

No. LP3892ES-1.5/NOPB requires an external VBIAS rail between 4.5 V and 6 V to drive the N-MOS pass transistor gate. If VBIAS falls below ~4 V, under-voltage lockout disables output. Connecting VBIAS to VIN is invalid if VIN < 4.5 V - a dedicated bias source (e.g., auxiliary 5V rail) is mandatory.

What output capacitor types are recommended for LP3892ES-1.5/NOPB stability?

Tantalum capacitors are recommended for LP3892ES-1.5/NOPB output (≥10 µF), due to stable ESR across temperature. Aluminum electrolytics may be used only above 10°C; ceramics are unsuitable alone (ESR too low) but can supplement up to 15% of total tantalum capacitance. ESR must fall within the "stable region" in Figure 19.

Does LP3892ES-1.5/NOPB require external compensation components?

No. LP3892ES-1.5/NOPB is internally compensated and stable with ≥10 µF output capacitance meeting ESR requirements. No external resistors, capacitors, or feedforward networks are needed - reducing bill-of-materials and layout risk compared to adjustable or older LDO architectures.

How is thermal performance managed in the DDPAK/TO-263 package of LP3892ES-1.5/NOPB?

LP3892ES-1.5/NOPB's DDPAK/TO-263 package relies on soldering the exposed thermal pad to ≥1.5 in² of 1-oz copper for θ_JA ≈40°C/W. Without adequate copper, junction temperature rises rapidly - e.g., >125°C at 1.5A with minimal copper. Thermal vias to inner ground planes further enhance dissipation in multilayer boards.