Texas Instruments TPS76850QD

Overview

TPS76850QD from Texas Instruments is a 5.0-V fixed-output, 1-A low-dropout (LDO) linear voltage regulator in an SOIC-8 package, featuring 230 mV typical dropout at 1 A, ±2% output accuracy over temperature and load, 85 µA typical quiescent current, and open-drain power-good (PG) monitoring. It delivers stable regulation for battery-powered instrumentation and automotive control modules requiring precise, low-noise 5-V supply rails.

For engineers reviewing the TPS76850QD datasheet, TPS76850QD pinout, TPS76850QD application, or TPS76850QD equivalent, key selection criteria include dropout voltage under full load, PG threshold hysteresis, thermal shutdown behavior, SOIC-8 thermal resistance (172°C/W), and compatibility with 10-µF/60–1500-mΩ output capacitors.

Technical Context

The TPS76850QD uses a PMOS pass transistor architecture to achieve ultra-low, load-independent quiescent current and avoid PNP saturation effects during dropout. Its internal 1.1834-V reference feeds a high-impedance feedback amplifier, enabling stable operation without minimum load requirements.

Power-good logic monitors output voltage continuously; PG asserts low when VO drops below 92–98% of nominal (i.e., 4.6–4.9 V), with 0.5% hysteresis. The EN pin accepts TTL-compatible logic (VIH ≥ 1.7 V, VIL ≤ 0.9 V) to enable/disable regulation, reducing quiescent current to <1 µA in shutdown.

Key Specifications

Pinout & Package

TPS76850QD is housed in an 8-pin SOIC (D) package with exposed pad thermal enhancement (not electrically connected). Pin 1 is GND; pins 3 and 4 are parallel IN inputs; pins 5 and 6 are parallel OUT outputs; pin 8 is open-drain PG; pin 2 is active-high EN; pin 7 is NC (no internal connection) for fixed-output variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76850QPWP and TLV76850QWDR, the TPS76850QD offers proven SOIC-8 manufacturability and 10-V input tolerance at the cost of higher thermal resistance-making it optimal for cost-sensitive, moderate-power automotive and industrial applications where board space and thermal mass are constrained.

Availability

TPS76850QD is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O channels, and portable medical instrumentation requiring stable component supply with guaranteed long-term availability and AEC-Q100-compliant sourcing.

Supply support for TPS76850QD 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.

The TPS768xxQ product line delivers high-accuracy, low-quiescent-current LDO regulators optimized for battery-powered and thermally constrained automotive and industrial systems requiring robust power-good signaling and wide-input operation.

FAQ

What is the maximum input voltage rating for the TPS76850QD?

The TPS76850QD has an absolute maximum input voltage of 13.5 V, but its recommended operating input range is 2.7 V to 10 V. Exceeding 10 V may cause excessive power dissipation or reliability concerns, especially at elevated temperatures. Always maintain VIN ≤ 10 V for continuous operation per TI's SLVS211L specification.

Does the TPS76850QD require an external output capacitor, and what are the specifications?

Yes, the TPS76850QD requires an external output capacitor between OUT and GND for stability. TI specifies a minimum of 10 µF with ESR between 60 mΩ and 1.5 Ω. Solid tantalum, aluminum electrolytic, or multilayer ceramic capacitors meeting these values are acceptable. The TPS76850QD is stable with zero load and does not require a minimum load resistor.

How does the power-good (PG) output function on the TPS76850QD?

The TPS76850QD's PG pin is an open-drain output that goes low when the regulated output falls below 92–98% of 5.0 V (i.e., 4.6–4.9 V), with 0.5% hysteresis. It requires an external pull-up resistor to VI or VO. PG does not indicate ±2% regulation compliance-it signals only output undervoltage relative to nominal, making it ideal for power-on reset and brownout detection.

Can the TPS76850QD be used in automotive applications, and what qualifications does it meet?

Yes, the TPS76850QD is qualified for automotive use with an operating junction temperature range of –40°C to +125°C and is manufactured in TI's AEC-Q100-compliant production flow. Its SOIC-8 package (D) carries Level-1 MSL rating, and the device features thermal shutdown, current limiting, and robust ESD protection (2 kV HBM), satisfying key requirements for under-hood and cabin electronics.

What is the thermal performance of the TPS76850QD in its SOIC-8 package?

The TPS76850QD in SOIC-8 (D) package has a junction-to-ambient thermal resistance (θJA) of 172°C/W with no airflow. At TA = +25°C, its maximum continuous power dissipation is 568 mW. Derating is required above +25°C (5.68 mW/°C), limiting usable power to 312.5 mW at +70°C. Proper PCB copper area under the exposed pad significantly improves thermal performance.