TPS73801QDCQRQ1 - 1A Low-Noise LDO, AEC-Q100 | TI
MPN: TPS73801QDCQRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.31 | $13.10 |
| 100 | $1.08 | $108.00 |
| 500 | $0.9 | $450.00 |
| 1,000 | $0.72 | $720.00 |
TPS73801QDCQRQ1 Overview
An LDO regulator is a type of linear voltage regulator within the broader power management IC hierarchy that maintains a stable output voltage even when the input voltage is only slightly higher than the output. Unlike switching regulators, LDOs add no switching noise and excel at cleaning up noisy DC rails. The TPS73801 belongs to TI's low-noise, fast-transient-response LDO family.
Key features include fast transient response optimized for load steps, an operating quiescent current of 1mA that drops to less than 1uA in shutdown, and quiescent current that is well controlled and does not rise in dropout - a common problem with other regulators. The device also integrates reverse current and reverse voltage protection, protecting the output stage when input collapses below output, an important reliability feature in automotive cold-crank and load-dump scenarios.
Architecturally, the TPS73801 uses a precision reference and error amplifier topology tuned for transient performance, allowing tight regulation during fast microcontroller load transitions without large output capacitor banks.
Typical applications include automotive body electronics and ADAS power rails, post-regulation of DC-DC converter outputs powering microcontrollers and sensors, and industrial point-of-load supplies where low noise and fast response are required.
Design tip: ensure adequate input-to-output headroom for the 300mV dropout at 1A, and use the shutdown pin (quiescent current under 1uA) to save power in sleep states. Prices referenced as of 2026-08-29.
Drop-in alternatives for TPS73801QDCQRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TPS73801QDCQRQ1 (same form factor and footprint) — differing in Input Voltage Range, Output Type, Package, Protection Features, Quiescent Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS73801DCQR
✅ Drop-In✓ In Stock
$1.32 / Unit
View Datasheet →TPS73801QDCQRQ1 Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable, positive |
| Maximum Output Current | 1 A |
| Input Voltage Range | up to 20 V |
| Dropout Voltage | 300 mV at 1 A |
| Quiescent Current | 1 mA (operating) |
| Shutdown Quiescent Current | < 1 uA |
| Protection Features | Reverse current, reverse voltage |
| Transient Response | Fast transient response optimized |
| Automotive Qualification | AEC-Q100 (Q1) |
| Package | SOT-223-6 (DCQ) |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Topology | LDO (Low Dropout) |
TPS73801QDCQRQ1 Pin Configuration
| Pin 1 | IN — Input supply voltage, up to 20V |
| Pin 2 | GND — Ground |
| Pin 3 | EN — Enable/shutdown control; low current shutdown below 1uA |
| Pin 4 | OUT — Regulated output (also tab for heatsinking) |
| Pin 5 | GND — Ground |
| Pin 6 | NC — No connect [DATA_NEEDED: confirm pin 5/6 assignment against datasheet] |
Typical Applications
TPS73801QDCQRQ1 is suitable for 6 applications: Automotive Post-Regulation of DC-DC Rails, Microcontroller and DSP Point-of-Load Supply, Sensor and Analog Rail Cleanup, Body Electronics and Lighting Modules, Infotainment and Connectivity Rails, Industrial 24V Systems with Pre-Regulation.
Automotive Post-Regulation of DC-DC Rails
The TPS73801QDCQRQ1 is ideal for post-regulation of switching converter outputs in automotive ECUs. Its 1A output and 300mV dropout allow efficient 5V-to-3.3V or 3.8V-to-3.3V conversion, while the fast transient response suppresses load-step excursions from microcontroller clocks. AEC-Q100 qualification and reverse voltage protection address automotive supply disturbances such as cold crank. Place the LDO after a wide-VIN converter like the TPS54360QDDARQ1 to deliver a clean analog or logic rail with no switching residual.
Recommended
Microcontroller and DSP Point-of-Load Supply
Automotive MCUs such as the TMS320F280049-Q1 family impose fast load steps on their core rails. The TPS73801QDCQRQ1 handles these with its optimized transient response and does not suffer rising quiescent current in dropout, keeping power predictable. With 1A capacity it covers most single-MCU core or I/O rails, and the shutdown pin (under 1uA) enables low-power sleep states. Output ceramic capacitors of a few uF are typically sufficient thanks to the fast loop.
Recommended
Sensor and Analog Rail Cleanup
Analog sensors and signal chains need ripple-free supplies to preserve accuracy. As a linear regulator, the TPS73801QDCQRQ1 adds no switching noise, and its low-noise design suits sensor excitation rails for current-sense amplifiers like the TMCS1101-Q1 or INA240A1QPWRQ1. The adjustable output lets designers set custom 3.3V, 4.096V, or 5V rails. Reverse current protection prevents damage when the downstream rail is held up by large capacitance during input power removal.
Recommended
Body Electronics and Lighting Modules
Body control modules, door-zone ECUs, and LED lighting controllers need compact, qualified point-of-load regulators. The SOT-223-6 package offers a low-profile thermal tab simplifying PCB heatsinking for 1A loads, an advantage in dense body-electronics layouts. AEC-Q100 qualification of the QDCQRQ1 variant supports direct automotive design-in. Pairing with LED drivers such as the TPS92691 provides a complete lighting power chain with clean logic supply.
Recommended
Infotainment and Connectivity Rails
Automotive connectivity modules (CAN, Ethernet, wireless) benefit from the TPS73801QDCQRQ1 as a clean local regulator for transceivers. Its fast response handles bursty transceiver currents from parts like the TCAN4550RGYRQ1, while reverse-voltage protection guards against back-feeding during fault conditions. The adjustable output supports both 3.3V transceiver cores and 5V interfaces, and the 20V input rating tolerates typical regulated automotive 5V/12V intermediate rails with margin.
Recommended
Industrial 24V Systems with Pre-Regulation
In industrial automation, a two-stage approach using a 24V-input buck (such as the LM5176QPWPRQ1 or TPS54360DDAR) down to about 4V, followed by the TPS73801QDCQRQ1, yields a low-noise 3.3V/1A rail for PLC analog sections and precision ADCs like the ADS1258-EP. The 300mV dropout keeps second-stage losses low, while the fast transient loop rejects post-buck ripple better than slower LDOs, improving measurement repeatability in factory environments.
Recommended
Recommended Products Summary
Engineering reference data for TPS73801QDCQRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS73801DCQR | TPS74801QDRCRQ1 | TPS73501QDRBRQ1 |
|---|---|---|---|---|
| Package | SOT-223-6 (DCQ) | SOT-223-6 (DCQ) - same | VQFN-20 (DRC) - different | VQFN-8 (DRB) - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 1 A | 1 A | 1.5 A | 500 mA |
| AEC-Q100 | Qualified (Q1) | Not qualified | Qualified (Q1) | Qualified (Q1) |
Key Differentiators
- AEC-Q100 automotive qualification (vs TPS73801DCQR)
- Controlled quiescent current in dropout (vs TPS74801QDRCRQ1)
- Reverse current and reverse voltage protection integrated (vs TPS73501QDRBRQ1)
Design Notes
At 1A load with large VIN-VOUT differentials, power dissipation in the SOT-223-6 package rises quickly (e.g., 12V-to-3.3V at 1A is about 8.7W - far beyond what the package can handle without attention). The exposed tab (OUT) must be soldered to a generous copper pour, at least 1 square inch. For large drops, use an upstream buck converter and reserve the LDO for final cleanup at 300-500mV headroom.
Place input and output ceramic capacitors (typically 1uF-10uF per datasheet recommendations) within a few millimeters of the IN and OUT pins. The tab acts as the output and thermal path - connect it to a low-impedance output plane and thermal pour. Keep the EN pin trace short and defined; never leave it floating.
The TPS73801 includes reverse current protection, but do not rely on it for sustained reverse-voltage faults at high current. Do not exceed the 20V input rating in load-dump conditions without upstream protection (TVS or pre-regulator). Verify dropout: at 1A the regulator needs roughly 300mV of headroom, so a 3.3V rail requires at least 3.6V input under worst-case load and temperature.
Compliance Information
Q1 suffix confirms AEC-Q100 automotive qualification per TI product page. RoHS/REACH/lead-free status not present in provided data - see TI product page for full quality/environmental documentation.
