Texas Instruments TPS76850QPWPRQ1

Overview

TPS76850QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 5-V fixed-output low-dropout (LDO) voltage regulator with PMOS pass element, 1-A output current capability, 230-mV dropout at 1 A (T_J = 25°C), ±2% output voltage tolerance over line/load/temperature, and open-drain power-good (PG) output. It powers critical 5-V rails in engine control units and ADAS domain controllers where fast transient response and ultra-low quiescent current are essential.

For engineers reviewing the TPS76850QPWPRQ1 datasheet, TPS76850QPWPRQ1 pinout, TPS76850QPWPRQ1 application, or TPS76850QPWPRQ1 equivalent, key selection criteria include its 85-μA typical quiescent current, thermal shutdown protection, EN-controlled shutdown mode (<1-μA standby), stability with 10-μF output capacitors, and HTSSOP-20 package with exposed thermal pad for automotive under-hood thermal management.

Technical Context

The TPS76850QPWPRQ1 uses a voltage-driven PMOS pass transistor to achieve load-independent quiescent current and avoid PNP saturation effects during dropout-enabling stable operation down to 2.7 V input while maintaining <125 μA GND current across –40°C to 125°C ambient. Its internal 1.1834-V reference and error amplifier deliver tight regulation without external compensation.

Power-good logic monitors output voltage with 92–98% VO trip threshold and 0.5% hysteresis, asserting PG high only when VO remains within specification; EN pin accepts TTL-compatible logic levels (low-enable, <0.9 V disable, >1.7 V shutdown), and thermal protection disables output above 150°C junction temperature with automatic recovery at ~130°C.

Key Specifications

Pinout & Package

TPS76850QPWPRQ1 is housed in a thermally enhanced 20-pin HTSSOP (PWP) package measuring 6.50 mm × 4.40 mm with an exposed thermal pad soldered to PCB ground for efficient heat dissipation in automotive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7B6750QPWPRQ1 and TLV73350PDBVR, the TPS76850QPWPRQ1 uniquely combines 1-A output, AEC-Q100 Grade 1 qualification, open-drain PG, and 230-mV dropout in HTSSOP-20 - making it the only direct fit for high-current, safety-critical 5-V regulation in powertrain and ADAS systems.

Availability

TPS76850QPWPRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and instrument clusters requiring stable component supply with automotive-grade traceability and long-term lifecycle support.

Supply support for TPS76850QPWPRQ1 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 automotive electronics, with decades of experience in high-reliability power management solutions.

The TPS768xx-Q1 product line was designed specifically for automotive powertrain and ADAS applications demanding AEC-Q100 qualification, fast transient response, and ultra-low quiescent current in harsh thermal environments.

FAQ

What is the minimum input voltage required for TPS76850QPWPRQ1 to regulate 5 V at 1 A?

The minimum input voltage for TPS76850QPWPRQ1 to maintain 5-V regulation at 1 A is 5.38 V at 25°C (5 V + 230 mV dropout). At full temperature range (–40°C to 125°C), worst-case dropout is 380 mV, so VI(min) = 5.38 V. The device shuts down if input falls below 2.7 V regardless of load. This ensures reliable operation across automotive battery voltage fluctuations.

Does TPS76850QPWPRQ1 require an external feedback resistor network?

No, TPS76850QPWPRQ1 is a fixed 5-V output variant and does not require external feedback resistors. Pin 15 (FB/NC) is a no-connect terminal and must remain unconnected. Only the adjustable TPS76801-Q1 version uses FB for voltage programming; using resistors with TPS76850QPWPRQ1 would violate its internal reference configuration and cause regulation failure.

How does the power-good (PG) output of TPS76850QPWPRQ1 behave during startup and fault conditions?

The PG output of TPS76850QPWPRQ1 is an open-drain signal that goes high only when the output voltage reaches and sustains ≥92% of 5 V (≥4.6 V). It remains low during startup until regulation is achieved, and asserts low again if VO drops below 98% (4.9 V) during brownout. PG does not indicate ±2% tolerance compliance - it monitors relative VO decay, making it ideal for power-on reset timing and low-battery alerts in TPS76850QPWPRQ1-based systems.

Can TPS76850QPWPRQ1 be used in parallel to increase output current beyond 1 A?

No, TPS76850QPWPRQ1 is not designed for parallel operation. Its PMOS pass architecture lacks built-in current-sharing circuitry, and mismatched dropout voltages between units would cause uneven current distribution and potential thermal runaway. For >1-A requirements, select a single higher-current LDO such as TPS7H1101A-Q1 or redesign the power architecture - do not parallel TPS76850QPWPRQ1 devices.

What thermal design considerations apply to TPS76850QPWPRQ1 in automotive under-hood applications?

TPS76850QPWPRQ1 requires soldering its exposed thermal pad to a large copper pour connected to PCB ground for effective heat dissipation. With R_θJA = 39.5°C/W, continuous 1-A operation at 125°C ambient demands careful thermal layout: minimize VIN–VO differential, use ≥2 oz copper, and avoid enclosing the HTSSOP-20 in sealed enclosures. Junction temperature must stay ≤125°C for guaranteed operation; thermal shutdown at 150°C is a safety limit, not a design target.