Texas Instruments LP3962ESX-3.3/NOPB

Overview

LP3962ESX-3.3/NOPB from Texas Instruments is a 3.3V, 1.5A ultra-low-dropout linear regulator in SOT-223-5 package, featuring 38 mV dropout at 150 mA and ±1.5% output voltage accuracy at 25°C. It integrates an open-drain ERROR flag for output undervoltage detection and operates from 2.5V to 7.0V input, targeting microprocessor core power and low-voltage bus termination.

For engineers reviewing the LP3962ESX-3.3/NOPB datasheet, LP3962ESX-3.3/NOPB pinout, LP3962ESX-3.3/NOPB application, or LP3962ESX-3.3/NOPB equivalent, key selection criteria include dropout performance under 1.5A load, ERROR flag threshold (−10% VOUT), shutdown quiescent current (15 µA), and SOT-223 thermal derating (θjA = 90°C/W).

Technical Context

The LP3962ESX-3.3/NOPB uses a CMOS-based PMOS pass element with typical Rds(on) of 240 mΩ, enabling ultra-low dropout operation independent of load current. Its error amplifier drives the pass device with fast transient response-evidenced by sub-25 µs turn-on delay and stable regulation under 1.5A step loads.

It implements a dedicated ERROR comparator with built-in hysteresis (5% threshold hysteresis) referenced to nominal VOUT, asserting low when output falls >10% below 3.3V. Shutdown control is CMOS-compatible, requiring active pull-up (10 kΩ) and delivering 15 µA quiescent current when SD ≤ 0.2V.

Key Specifications

Pinout & Package

SOT-223-5 surface-mount package with exposed thermal pad (pin 3 is VOUT, pin 5 is GND); θjA = 90°C/W on 0.5 in² 1 oz copper, requiring thermal vias for >1A sustained operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSS721AIDR and TPS76333QDBVRQ1, the LP3962ESX-3.3/NOPB uniquely combines 1.5A output, integrated ERROR flag, and ultra-low dropout in SOT-223-making it optimal for space-constrained, high-reliability industrial and computing applications requiring both performance and fault visibility.

Availability

LP3962ESX-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor power supplies, GTL+/SSTL bus terminators, and SCSI terminator circuits requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LP3962ESX-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 power management ICs, with decades of LDO design heritage and broad industrial qualification.

The LP3962 series belongs to TI's ultra-low-dropout linear regulator product line, engineered specifically for high-current, low-margin applications in computing, communications, and industrial control where precision, speed, and reliability are critical.

FAQ

What is the dropout voltage specification for LP3962ESX-3.3/NOPB at full 1.5A load?

The LP3962ESX-3.3/NOPB has a typical dropout voltage of 380 mV at 1.5A load current, defined as the minimum VIN–VOUT differential required to maintain output regulation within 2% of 3.3V. This value is confirmed in the Electrical Characteristics table of the SNVS066H datasheet and enables operation with inputs as low as 3.68V under full load.

Does LP3962ESX-3.3/NOPB include an error flag, and how does it behave?

Yes, LP3962ESX-3.3/NOPB includes an open-drain ERROR pin that asserts low when the output voltage drops more than 10% below its nominal 3.3V value-due to low input, overload, or thermal limit. The flag features built-in hysteresis (5%) and must be pulled high externally with a 10 kΩ resistor; it is disabled during shutdown.

What package type and thermal characteristics apply to LP3962ESX-3.3/NOPB?

LP3962ESX-3.3/NOPB is supplied in the SOT-223-5 package with exposed thermal pad. Its junction-to-ambient thermal resistance is θjA = 90°C/W on a 0.5 in², 1 oz copper PCB area. For sustained 1.5A operation, thermal vias under the pad and adequate copper pour are required to avoid exceeding 125°C junction temperature.

Can LP3962ESX-3.3/NOPB be used with ceramic output capacitors?

No-LP3962ESX-3.3/NOPB requires an output capacitor with ESR between 0.2 Ω and 5 Ω for loop stability, which excludes standard ceramic capacitors (typically <10 mΩ). Tantalum capacitors (e.g., 33 µF, ~1 Ω ESR) are recommended; ceramics may be added in parallel only if total equivalent ESR remains within the specified range.

What is the shutdown quiescent current of LP3962ESX-3.3/NOPB, and how is the SD pin configured?

LP3962ESX-3.3/NOPB draws 15 µA quiescent current in shutdown mode when the SD pin is pulled to ≤0.2V. The SD pin is CMOS-compatible and must be actively pulled high via a 10 kΩ resistor for normal operation; it can be driven directly by logic outputs capable of rail-to-rail swing without the resistor.