Texas Instruments TL1963ADCQT

Overview

TL1963ADCQT from Texas Instruments is a 1.5A low-noise, fast-transient-response LDO regulator in a 6-pin SOT-223 (DCQ) package, delivering ±1.5% output accuracy over line/load/temperature, 340mV typical dropout at 1.5A, and 23μVRMS output noise (10Hz–100kHz). It supports adjustable (1.21V–20V) or fixed 3.3V output and is used in EV charging infrastructure power rails requiring stable, low-noise bias for analog front-ends.

For engineers reviewing the TL1963ADCQT datasheet, TL1963ADCQT pinout, TL1963ADCQT application, or TL1963ADCQT equivalent, this page provides verified DCQ-package-specific parameters including shutdown threshold (0.25–0.75V), reverse-current protection (250µA steady-state), thermal shutdown (150°C trip), and ESR-stable operation with ≥10µF/≤3Ω output capacitors.

Technical Context

The TL1963ADCQT implements a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking without external diodes. Its error amplifier features Kelvin-sense capability via dedicated SENSE/ADJ pin, supporting both fixed-output and adjustable configurations with feedback divider bias current ≤10µA.

It integrates active thermal foldback during overload, precise UVLO (2.0–2.3V rising edge), and fast reverse-current protection (<5µs response when VOUT–VIN exceeds 25mV), making it suitable for systems with dynamic load sequencing or battery-backed supplies where backfeed must be actively suppressed.

Key Specifications

Pinout & Package

TL1963ADCQT uses a 6-pin SOT-223 (DCQ) package measuring 6.50mm × 7.06mm with exposed thermal pad connected to GND. The pinout supports Kelvin sensing and independent shutdown control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESK and TPS7A8300RGRT, TL1963ADCQT uniquely combines 1.5A current delivery, integrated reverse-current blocking, and ±1.5% accuracy in a thermally enhanced SOT-223 package - making it irreplaceable in high-current industrial power rails requiring backfeed prevention.

Availability

TL1963ADCQT is available at Aetrix Electronics and suitable for EV charging infrastructure, energy storage systems, medical imaging, and semiconductor test equipment requiring stable component supply with guaranteed long-term availability.

Supply support for TL1963ADCQT 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 and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and medical markets.

The TL1963A product line delivers robust, high-current LDO regulators optimized for noise-sensitive applications in EV infrastructure, test equipment, and precision instrumentation where reliability and parameter stability are critical.

FAQ

What is the maximum output current rating for TL1963ADCQT?

The TL1963ADCQT is rated for up to 1.5A of continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Its current limit is specified at 1.6A minimum over temperature, ensuring headroom for transient surges without foldback. This rating applies specifically to the DCQ package with correctly soldered thermal pad - derating is required above 125°C junction temperature.

Does TL1963ADCQT support adjustable output voltage?

Yes, TL1963ADCQT supports adjustable output voltage from 1.21V to 20V using an external resistor divider connected to the SENSE/ADJ pin. The internal reference voltage is 1.21V ±1.5%, and ADJ pin bias current is ≤10µA - enabling high-accuracy designs with standard 1% resistors. Fixed 3.3V operation is also supported by connecting SENSE/ADJ directly to OUT.

What thermal performance can be expected from TL1963ADCQT in a standard 2-layer PCB layout?

With the exposed thermal pad properly soldered to a 1-in² copper pour on a 2-layer FR-4 board, TL1963ADCQT achieves RθJA ≈ 50.5°C/W (legacy spec), allowing ~1.2A continuous current at 25°C ambient before reaching 125°C junction. For full 1.5A operation, a 4-layer board with internal ground/power planes is recommended to achieve RθJA < 40°C/W per TI layout guidelines.

Is reverse-battery protection included in TL1963ADCQT?

No, reverse-battery protection is exclusive to legacy TL1963A variants (e.g., DCY/KTT legacy chips). TL1963ADCQT belongs to the "new chip" family and does not include reverse-battery protection. However, it does provide active reverse-current protection that blocks backfeed when VOUT exceeds VIN by >25mV - a distinct feature optimized for system-level power sequencing rather than battery polarity reversal.

What output capacitor specifications are required for stable operation of TL1963ADCQT?

TL1963ADCQT requires a minimum 10µF ceramic output capacitor with ESR ≤3Ω for unconditional stability across all operating conditions. TI recommends X7R or X5R dielectrics; tantalum or aluminum electrolytics are not supported. Placement within 5mm of the OUT and GND pins is mandatory to preserve fast transient response and avoid oscillation under step-load conditions.