Texas Instruments TPS7A5310AQWRTJRQ1

Overview

TPS7A5310AQWRTJRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LDO voltage regulator delivering 3 A output with 130 mV dropout at full load, 5.6 µV_RMS output noise, and ±1.3% total accuracy over line, load, and temperature (–40°C to +125°C). It supports low-input/low-output (LILO) operation using dual-supply architecture (IN and BIAS rails) and powers noise-sensitive RF components in radar sensor systems.

For engineers reviewing the TPS7A5310AQWRTJRQ1 datasheet, TPS7A5310AQWRTJRQ1 pinout, TPS7A5310AQWRTJRQ1 application, or TPS7A5310AQWRTJRQ1 equivalent, key selection criteria include its wettable-flank 4-mm × 4-mm WQFN-20 package, programmable soft-start via NR/SS pin, open-drain power-good (PG) output, and dual-rail PSRR performance (40 dB at 500 kHz on IN, 65 dB at 1 kHz on BIAS).

Technical Context

The TPS7A5310AQWRTJRQ1 uses an NMOS pass transistor architecture enabling stable operation with ≥10 µF ceramic output capacitance and superior transient response in low-V_IN/low-V_OUT conditions. Its dual-supply design separates bias rail (BIAS) from main input (IN), allowing optimized dc/ac performance when V_IN ≤ 2.2 V.

Functional blocks include a 1-V internal reference, adjustable soft-start circuit (via external capacitor on NR/SS), active discharge (500-Ω pulldown on OUT), and UVLO protection on both IN and BIAS rails. The PG output monitors regulated V_OUT with 90% V_OUT trip threshold and 2.5% hysteresis.

Key Specifications

Pinout & Package

TPS7A5310AQWRTJRQ1 is housed in a 4.00 mm × 4.00 mm, 20-pin WQFN package (RTJ) with wettable flanks and high-CTE mold compound (12 ppm/°C) for automated optical inspection and thermal reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A5301AQWRTJRQ1, TPS7A5310AQWRTJRQ1 is the current production part number for the 1.0-V variant; compared with TPS7A83AQRGWRQ1, it offers lower dropout, BIAS-rail optimization, and guaranteed 1.0-V output - making it uniquely suited for next-gen automotive radar and infotainment core rails.

Availability

TPS7A5310AQWRTJRQ1 is available at Aetrix Electronics and suitable for automotive telematics, radar sensor systems, and infotainment processors requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.

Supply support for TPS7A5310AQWRTJRQ1 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 and embedded processing technologies, with decades of automotive-grade product development and AEC-Q100 qualification expertise.

The TPS7A53x-Q1 product line was designed specifically for high-performance automotive power management, targeting noise-sensitive RF and digital loads in radar, ADAS, and infotainment systems where LILO operation and ultra-low noise are mandatory.

FAQ

What is the output voltage of the TPS7A5310AQWRTJRQ1?

The TPS7A5310AQWRTJRQ1 is a fixed-output LDO with a nominal output voltage of 1.0 V. This value is factory-trimmed and specified with ±1.3% accuracy over line, load, and temperature (–40°C to +125°C). The device does not support adjustable output; the "10" in the part number denotes the 1.0-V variant, and the internal reference is fixed at 1.0 V per the Electrical Characteristics table.

Does the TPS7A5310AQWRTJRQ1 require an external capacitor on the NR/SS pin?

Yes, the TPS7A5310AQWRTJRQ1 requires an external capacitor between the NR/SS pin (Pin 13) and GND to enable soft-start functionality. A typical value is 10 nF, yielding ~2 ms startup time for 1.0 V output. Without this capacitor, the device starts with maximum slew rate, risking inrush current into large output capacitors. The capacitor also reduces output voltage ripple by filtering internal reference noise.

Can the TPS7A5310AQWRTJRQ1 operate with only the IN pin powered, without connecting BIAS?

Yes, the TPS7A5310AQWRTJRQ1 can operate with only the IN pin powered, but performance degrades below VIN ≈ 2.2 V. When V_IN ≤ 2.2 V, connecting a valid BIAS supply (≥V_OUT + V_DO(BIAS), min 1.7 V) is required to maintain specified PSRR, dropout, and accuracy. The BIAS rail powers internal control circuitry independently, so omitting it above 2.2 V is acceptable but not recommended for noise-critical applications.

What is the purpose of the SNS pin on the TPS7A5310AQWRTJRQ1?

The SNS (sense) pin (Pin 2) on the TPS7A5310AQWRTJRQ1 enables remote voltage sensing at the load, compensating for IR drop across PCB traces or connectors. When used, the feedback loop regulates voltage at the SNS node rather than at the OUT pin, improving output accuracy under high-current or long-trace conditions. It must be connected directly to the load's V_CC net, separate from the power path.

Is the TPS7A5310AQWRTJRQ1 compatible with standard reflow profiles for automotive PCB assembly?

Yes, the TPS7A5310AQWRTJRQ1 in its RTJ (WQFN-20) package is qualified for standard lead-free reflow profiles, including JEDEC J-STD-020 moisture sensitivity level 3 (MSL 3) handling. Its wettable flanks facilitate automated optical inspection (AOI) of solder joints, and the high-CTE mold compound (12 ppm/°C) ensures mechanical reliability under automotive thermal cycling. Board layout must follow TI's recommended thermal pad stencil and solder paste guidelines.