Texas Instruments TPS7A6650HQDGNRQ1

Overview

TPS7A6650HQDGNRQ1 from Texas Instruments is an AEC-Q100 Grade 0 automotive-grade low-dropout linear regulator with integrated power-on reset (PG), 5-V fixed output, 50-mA output current capability, 12-µA typical quiescent current at light load, and operation across –40°C to 150°C ambient temperature. It delivers stable regulation in powertrain sensor modules and always-on battery systems under cold-crank conditions.

For engineers reviewing the TPS7A6650HQDGNRQ1 datasheet, TPS7A6650HQDGNRQ1 pinout, TPS7A6650HQDGNRQ1 application, or TPS7A6650HQDGNRQ1 equivalent, key selection criteria include its 4–40-V input range, programmable reset delay via CT pin, low-dropout performance (130 mV @ 50 mA), and HVSSOP-8 thermal pad package for high-temperature automotive environments.

Technical Context

The TPS7A6650HQDGNRQ1 integrates a precision bandgap reference, undervoltage lockout (UVLO) with 2.6-V threshold and 1-V hysteresis, and thermal shutdown at 175°C with 20°C hysteresis. Its internal pass element supports dropout as low as 130 mV at full 50-mA load while maintaining ±2% output voltage accuracy over line, load, and temperature.

Reset functionality is implemented via open-drain PG output with 91.6% V_OUT threshold and externally programmable delay (100 nF → ~100 ms), synchronized to power-up sequencing. The CT pin sources a constant 1.4-µA current to charge the external capacitor, enabling deterministic POR timing without external oscillators or logic.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package with exposed thermal pad; 3.00 mm × 3.00 mm body size, 0.65-mm pitch; RoHS-compliant NiPdAu lead finish; MSL Level-2-260°C-1 year.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7B6750QPWPRQ1 and TLV73350PDBVR, the TPS7A6650HQDGNRQ1 uniquely balances ultra-low I_Q, programmable POR, and full AEC-Q100 Grade 0 qualification - making it optimal for cost-sensitive, thermally demanding automotive modules where timing control and longevity are critical.

Availability

TPS7A6650HQDGNRQ1 is available at Aetrix Electronics and suitable for powertrain sensor modules, infotainment systems with sleep mode, and body control modules requiring stable component supply across automotive production lifecycles.

Supply support for TPS7A6650HQDGNRQ1 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 headquartered in Dallas, Texas, designing analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The TPS7A66xx-Q1 product line delivers high-reliability LDO regulators optimized for automotive ambient temperatures up to 150°C, targeting always-on battery-powered subsystems where low quiescent current and robust fault protection are mandatory.

FAQ

What is the maximum input voltage rating for the TPS7A6650HQDGNRQ1?

The TPS7A6650HQDGNRQ1 supports 40 V continuously and withstands 45-V transients for up to 200 ms, as specified in its absolute maximum ratings. This enables direct connection to 24-V and 36-V automotive battery rails while surviving load-dump events without external protection circuitry. The device's UVLO threshold is 2.6 V with 1-V hysteresis, ensuring clean startup and shutdown behavior during battery recovery.

How does the CT pin function in the TPS7A6650HQDGNRQ1?

The CT pin on the TPS7A6650HQDGNRQ1 sources a constant 1.4-µA current to charge an external capacitor, setting the power-on-reset (POR) delay before the PG pin goes high. With a 100-nF capacitor, the typical delay is 100 ms; values from 100 pF to 100 nF yield delays from 50 µs to 180 ms. The TPS7A6650HQDGNRQ1 uses this analog timing method to avoid external clocks or digital logic, ensuring deterministic reset sequencing aligned with system boot requirements.

Is the TPS7A6650HQDGNRQ1 compatible with ceramic output capacitors?

Yes, the TPS7A6650HQDGNRQ1 is specifically designed for stability with low-ESR ceramic capacitors ranging from 2.2 µF to 100 µF and ESR between 1 mΩ and 2 Ω. TI recommends X7R or X8R dielectrics for optimal performance across temperature. Unlike older LDOs requiring tantalum or electrolytic capacitors, the TPS7A6650HQDGNRQ1 eliminates ESR-based compensation networks, simplifying design and improving transient response in automotive applications.

What thermal protection features does the TPS7A6650HQDGNRQ1 include?

The TPS7A6650HQDGNRQ1 incorporates thermal shutdown at approximately 175°C with 20°C hysteresis, allowing automatic recovery at ~155°C. It also features junction-to-ambient thermal resistance of 63.4°C/W in the HVSSOP-8 package. These protections prevent permanent damage during overload or poor heatsinking. However, TI explicitly states that thermal shutdown is intended for fault protection-not continuous operation-so proper PCB layout with thermal vias and copper pour is essential for sustained 50-mA loads at 150°C ambient.

Does the TPS7A6650HQDGNRQ1 support low-voltage tracking during cold-crank conditions?

Yes, the TPS7A6650HQDGNRQ1 implements low-voltage tracking: when input drops below regulation (e.g., during 6–8 V cold-crank), V_OUT follows V_IN minus a small dropout determined by load current and pass-FET resistance. This feature maintains partial functionality without requiring an external boost converter, reducing BOM count and board area. Tracking behavior is confirmed in Figure 5 (Load Regulation) and Section 7.3.6 of the datasheet, and is a key differentiator versus standard LDOs in automotive start-stop systems.