TPS7A84 - 3A Low-Noise LDO Regulator | Texas Instruments
MPN: TPS7A84 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.15 | $31.50 |
| 100 | $2.8 | $280.00 |
| 500 | $2.52 | $1,260.00 |
| 1,000 | $2.24 | $2,240.00 |
Drop-in alternatives for TPS7A84 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS7A84A
✅ Drop-In📋 Reference alternative (not in catalog)
TPS7A88
✅ Drop-In📋 Reference alternative (not in catalog)
TPS74401
✅ Drop-In📋 Reference alternative (not in catalog)
TPS7A85
✅ Drop-In📋 Reference alternative (not in catalog)
TPS7A8300RGRR
✅ Drop-In✓ In Stock
$0.96 / Unit
View Datasheet →LT3045
✅ Drop-In📋 Reference alternative (not in catalog)
TPS7A84 Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable / Pin-Programmable |
| Output Voltage Range (Pin-Programmable) | 0.8 V to 3.95 V |
| Output Voltage Range (Adjustable) | 0.8 V to 5.0 V |
| Maximum Output Current | 3 A |
| Dropout Voltage (Max) | 180 mV at 3 A |
| Input Voltage Range (Without BIAS) | 1.4 V to 6.5 V |
| Input Voltage Range (With BIAS) | 1.1 V to 6.5 V |
| Output Noise (0.8 V Output) | 4.4 µVRMS |
| Output Noise (5.0 V Output) | 7.7 µVRMS |
| Accuracy (Line, Load, Temperature) | 1% (max) |
| PSRR | [DATA_NEEDED: PSRR value] |
| Quiescent Current | [DATA_NEEDED: Quiescent current] |
| Operating Temperature Range | -40°C to +125°C |
| Package | 20-VQFN (RGR) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
TPS7A84 Pin Configuration
| Pin 1 | IN — Input supply voltage |
| Pin 2 | GND — Ground |
| Pin 3 | EN — Enable (active high) |
| Pin 4 | NR/SS — Noise reduction / soft-start |
| Pin 5 | OUT — Regulated output voltage |
| Pin 6 | SENSE — Output voltage sense |
| Pin 7 | BIAS — Bias supply for low input operation |
| Pin 8 | PG — Power good indicator |
| Pin 9 | FB — Feedback for adjustable output |
| Pin 10 | GND — Ground |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TPS7A84 is suitable for 6 applications: FPGA Power Supply, High-Speed ADC/DAC Power, Medical Imaging Equipment, Test and Measurement, High-Speed Communications, Video Processing.
FPGA Power Supply
The TPS7A84 provides a clean, low-noise 3A supply for FPGA core and I/O rails. Its low dropout of 180mV ensures efficient operation from a 5V or 3.3V input. The high PSRR and low noise (4.4µVRMS) minimize jitter and noise coupling into high-speed digital logic, improving overall system performance. Place the LDO close to the FPGA with 10µF ceramic capacitors on input and output for stability.
Recommended
High-Speed ADC/DAC Power
The TPS7A84 is ideal for powering high-speed ADCs and DACs, where power supply noise directly affects signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR). Its 4.4µVRMS noise and high PSRR ensure a clean analog supply, reducing noise floor and improving converter performance. Use a low-ESR ceramic capacitor at the output and a ferrite bead on the input to further isolate noise.
Recommended
Medical Imaging Equipment
In medical imaging systems like ultrasound and MRI, the TPS7A84 powers sensitive analog front ends and image processors. Its low noise and high accuracy (1%) ensure consistent image quality and reliable operation. The wide input voltage range and BIAS pin allow flexible power architecture. Proper thermal management is essential when operating at high current to maintain performance.
Recommended
Test and Measurement
The TPS7A84 is used in test and measurement equipment such as oscilloscopes and spectrum analyzers, where clean power rails are critical for accurate measurements. Its low noise and high PSRR reduce measurement errors caused by power supply interference. The adjustable output voltage allows precise setting of supply rails for various test circuits. Use proper decoupling and grounding techniques for optimal performance.
Recommended
High-Speed Communications
The TPS7A84 powers PLLs, VCOs, and high-speed transceivers in communication systems. Its low noise (4.4µVRMS) and high PSRR limit power-supply-generated phase noise and clock jitter, ensuring reliable data transmission. The 3A output current supports multiple rails from a single LDO. Place the LDO close to the sensitive components and use a dedicated ground plane to minimize noise.
Recommended
Video Processing
The TPS7A84 provides clean power for video processing FPGAs and ASICs, reducing artifacts and improving image quality. Its low noise and high PSRR ensure stable operation in high-bandwidth video systems. The pin-programmable output voltage simplifies design for multiple supply rails. Use adequate thermal relief and copper pour for heat dissipation.
Recommended
Recommended Products Summary
Engineering reference data for TPS7A84 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS7A84A | TPS7A88 | TPS74401 | TPS7A85 | TPS7A8300RGRR | LT3045 |
|---|---|---|---|---|---|---|---|
| Package | 20-VQFN (RGR) | 20-VQFN (RGR) | 20-VQFN (RGR) | 20-VQFN (RGR) | 20-VQFN (RGR) | 20-VQFN (RGR) | 20-VQFN (RGR) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Output Current | 3 A | 3 A | 2 A (dual) | 3 A | 4 A | 3 A | 0.5 A |
| Output Noise | 4.4 µVRMS | 4.4 µVRMS | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | 4.4 µVRMS | 0.8 µVRMS |
| Dropout Voltage | 180 mV | 180 mV | [DATA_NEEDED] | 240 mV | 200 mV | 180 mV | 260 mV |
| Input Voltage Range | 1.4V to 6.5V | 1.4V to 6.5V | 1.4V to 6.5V | 1.1V to 5.5V | 1.4V to 6.5V | 1.4V to 6.5V | 1.8V to 20V |
| Accuracy | 1% | 1% | 1% | 1% | 1% | 1% | 2% |
| Enable Pin | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Low noise of 4.4 µVRMS (vs TPS74401)
- Pin-programmable output voltage (vs TPS7A85)
- Higher output current than LT3045 (vs LT3045)
Design Notes
At VIN=5V, VOUT=3.3V, and 3A load, power dissipation is (5-3.3)*3 = 5.1W. The VQFN package has a thermal resistance of approximately 30°C/W (theta_JA). This results in a junction temperature rise of 153°C above ambient, which exceeds the maximum rating. Use a heatsink or a large copper pour (at least 2 square inches) to keep the junction temperature within limits. For high current operation, consider reducing dropout or using a lower input voltage.
Place input and output capacitors as close to the IC pins as possible. Use a 10µF ceramic capacitor on the input and a 10µF ceramic capacitor on the output. Add a 0.1µF ceramic capacitor in parallel for high-frequency noise bypass. The BIAS pin should be bypassed with a 1µF capacitor to ground. Ensure the exposed thermal pad is soldered to a large copper area for heat dissipation.
Do not exceed the maximum input voltage of 6.5V. Ensure the BIAS pin is connected to a voltage within its specified range. The NR/SS capacitor controls startup time and noise - do not omit it. Use 1% or better resistors for the feedback divider to maintain output voltage accuracy. Verify the pinout of any alternative before use.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified.
