Texas Instruments LP3962ET-3.3/NOPB

Overview

LP3962ET-3.3/NOPB from Texas Instruments is a fast ultra-low-dropout linear regulator delivering 1.5A DC output at fixed 3.3V, with 38mV typical dropout at 150mA and 380mV at 1.5A, ±1.5% output voltage accuracy, and integrated error flag for output monitoring-designed for microprocessor power supplies and low-voltage bus terminators.

For engineers reviewing the LP3962ET-3.3/NOPB datasheet, LP3962ET-3.3/NOPB pinout, LP3962ET-3.3/NOPB application, or LP3962ET-3.3/NOPB equivalent, key selection criteria include dropout performance under full load, error flag response to 10% output sag, shutdown quiescent current (15µA), thermal/overcurrent protection behavior, and SOT-223-5 package compatibility with high-current PCB layout constraints.

Technical Context

The LP3962ET-3.3/NOPB uses a CMOS-based PMOS pass element with 240mΩ typical R_DS(on), enabling ultra-low dropout and load-independent quiescent current. Its error flag comparator monitors V_OUT with 10% threshold hysteresis and open-drain output requiring external 10kΩ pull-up.

It operates from 2.5V to 7.0V input, supports −40°C to +125°C junction temperature, and integrates overtemperature shutdown (165°C trigger, 10°C hysteresis) and short-circuit protection (4.5A peak limit). The device requires 33µF output capacitor with 0.2–5Ω ESR for stability.

Key Specifications

Pinout & Package

SOT-223-5 surface-mount package with exposed thermal pad (pin 3 is VOUT, pin 5 is GND); designed for high-current thermal dissipation on 0.5in² 1oz copper area (θ_JA = 90°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS7A4700RGWR and MCP1826T-3302E/OT, the LP3962ET-3.3/NOPB uniquely balances 1.5A capability, 380mV dropout, integrated error flag, and 150µV_rms noise-making it optimal for space-constrained, high-current digital systems needing both performance and fault visibility.

Availability

LP3962ET-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor power supplies, GTL+/SSTL bus terminators, and DSP power management requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LP3962ET-3.3/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of LDO design expertise and broad automotive/industrial qualification.

The LP3962 series belongs to TI's ultra-low-dropout linear regulator product line, engineered specifically for high-current, low-voltage digital systems where fast transient response, precision output, and integrated fault signaling are essential.

FAQ

What is the minimum input voltage required for LP3962ET-3.3/NOPB to regulate 3.3V output at 1.5A?

The LP3962ET-3.3/NOPB requires a minimum input voltage of 3.68V to maintain regulation at 1.5A load, based on its 380mV typical dropout voltage specification. Below this, output voltage sags proportionally; the absolute minimum operating input is 2.5V, but that only supports regulation at lighter loads where dropout is lower.

Does LP3962ET-3.3/NOPB require an external resistor network to set its output voltage?

No. LP3962ET-3.3/NOPB is a fixed-output device with factory-trimmed 3.3V regulation-no external resistors are needed. Unlike the adjustable LP3965 variants, this part integrates the feedback divider internally and delivers 3.3V ±1.5% without configuration components.

How does the ERROR pin on LP3962ET-3.3/NOPB behave during shutdown?

When the SD pin is pulled low to activate shutdown mode, the ERROR pin on LP3962ET-3.3/NOPB is forced invalid (high-impedance) to minimize power consumption. It resumes active-low fault signaling only after SD returns high and the regulator re-enables with stable output.

Can LP3962ET-3.3/NOPB be used with ceramic output capacitors?

No-LP3962ET-3.3/NOPB requires an output capacitor with 0.2Ω to 5Ω ESR for loop stability, and standard ceramic capacitors fall far below this range (typically <10mΩ). Tantalum or aluminum polymer capacitors meeting the ESR window are mandatory; ceramics may be added in parallel only if total equivalent ESR remains within spec.

What thermal derating applies to LP3962ET-3.3/NOPB in SOT-223-5 package at 85°C ambient?

In SOT-223-5 package with 0.5in² 1oz copper, LP3962ET-3.3/NOPB has θ_JA = 90°C/W. At 85°C ambient and 125°C max junction temperature, allowable power dissipation is limited to (125−85)/90 = 0.44W. With 3.3V output and 1.5A load, input must stay ≤3.78V to meet this limit-requiring careful input rail design.