TPS7A84 - 3A Low-Noise LDO Regulator | Texas Instruments
MPN: TPS7A84 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.74 | $1,870.00 |
| 1,000 | $3.35 | $3,350.00 |
Drop-in alternatives for TPS7A84 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TPS7A84A
β Drop-Inπ Reference alternative (not in catalog)
TPS7A88
β Drop-Inπ Reference alternative (not in catalog)
TPS74401
β Drop-Inπ Reference alternative (not in catalog)
TPS7A53B
β‘ Same Packageπ Reference alternative (not in catalog)
TPS7A84 Maximum Ratings & Electrical Characteristics
| Output Current | 3 A |
| Maximum Dropout Voltage | 180 mV |
| Output Noise | 4.4 uVRMS at 0.8 V out; 7.7 uVRMS at 5.0 V out |
| Output Accuracy | 1% max over line, load, and temperature |
| Input Voltage Range (no BIAS) | 1.4 V to 6.5 V |
| Input Voltage Range (with BIAS) | 1.1 V to 6.5 V |
| Output Voltage (pin-programmable) | 0.8 V to 3.95 V |
| Output Voltage (adjustable) | 0.8 V to 5.0 V |
| PSRR | High PSRR [DATA_NEEDED: PSRR value at frequency] |
| Protection Features | Current limit, thermal shutdown |
| Power Good Output | Yes |
| Package | VQFN-20 (RGR) |
| Operating Junction Temperature | -40C to +125C |
| Mounting Type | Surface Mount |
| Reference Design | TPS7A84EVM-753 evaluation module |
| RoHS Status | Compliant |
TPS7A84 Pin Configuration
| Pin 1 | IN β Input supply voltage |
| Pin 4 | BIAS β Bias supply for internal circuits; enables VIN down to 1.1 V |
| Pin 8 | EN β Enable input, active high |
| Pin 10 | GND β Ground |
| Pin 12 | OUT β Regulated output voltage |
| Pin 15 | FB/VSET β Feedback / output voltage pin-programming |
| Pin 17 | PG β Power good indicator (open drain) |
| Pin 20 | NR/SS β Noise reduction / soft-start |
| Pin PAD | Thermal Pad β Connect to GND plane for heat dissipation |
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 and ASIC Core Power, High-Speed Communications and SerDes Power, PLL and VCO Power Rails, High-Speed ADC and DAC Supplies, Medical Imaging and Instrumentation, Test and Measurement Equipment.
FPGA and ASIC Core Power
The TPS7A84 sources 3 A with only 180 mV dropout, making it ideal for post-regulating FPGA and ASIC core rails from upstream switching converters. Its 1% accuracy over line, load, and temperature keeps core voltages within tight tolerance windows, while the pin-programmable 0.8 V to 3.95 V output range covers common core voltages without external resistors. Place it after a buck converter with 10 uF ceramic caps on input and output; the LDO removes switching ripple that the DC-DC cannot, at the cost of (VIN - VOUT) x 3 A dissipation, so keep dropout small.
Recommended
High-Speed Communications and SerDes Power
Per TI datasheet, the TPS7A84 limits power-supply-generated phase noise and clock jitter, making it ideal for powering SerDes and high-speed communications ICs. The 4.4 uVRMS output noise and high PSRR prevent supply-induced eye closure on multi-gigabit serial links. Typical topology post-regulates a 2.5 V or 3.3 V intermediate rail down to SerDes analog supplies; the BIAS pin supports inputs as low as 1.1 V for tight point-of-load conversion. The TPS7A84EVM-753 evaluation module provides a proven reference layout for these designs.
Recommended
PLL and VCO Power Rails
PLL and VCO phase noise is directly degraded by supply noise, so the TPS7A84's 4.4 uVRMS noise and high PSRR make it a natural choice for synthesizer rails. Its 1% output accuracy maintains VCO tuning sensitivity calibration across temperature. Use the low-noise architecture with proper input filtering (ferrite bead plus ceramic capacitors) to isolate the rail from switching regulators; the LDO's high PSRR then rejects residual ripple. This combination is standard in RF transceivers, test equipment, and wireless infrastructure designs requiring clean tuning voltages.
Recommended
High-Speed ADC and DAC Supplies
High-speed data converters are among the most noise-sensitive loads; supply noise on analog supplies translates directly into SNR degradation. The TPS7A84's 4.4 uVRMS output noise supports >100 dB-class converter dynamic ranges, and the 3 A rating covers high-speed converters with demanding analog supply currents. The adjustable 0.8 V to 5.0 V range covers 1.8 V AVDD and 1.2 V DVDD rails from a single regulator family. Post-regulate a switching rail and use short, wide traces with local 10 uF plus 0.1 uF decoupling at each supply pin.
Recommended
Medical Imaging and Instrumentation
Medical imaging front ends and precision instrumentation combine high analog performance with moderate currents, matching the TPS7A84's 3 A / 4.4 uVRMS profile. TI explicitly lists medical among its target applications. The -40C to +125C junction range and internal current limit and thermal shutdown provide robustness for diagnostic equipment. Use the BIAS pin when the main supply sits below 1.4 V, allowing regulation from 1.1 V input. Clean analog rails reduce artifact in image reconstruction chains and help meet system noise budgets in ultrasound and MRI front-end electronics.
Recommended
Test and Measurement Equipment
Oscilloscope, signal generator, and spectrum analyzer front ends demand rails free of spurious supply coupling. The TPS7A84's high PSRR and uVRMS-level noise prevent supply-borne spurs from appearing in measurement traces, while 3 A supports digital processing boards alongside analog front ends. Pin-programmable outputs let one PCB populate fixed voltages from 0.8 V to 3.95 V without redesign, simplifying platform variants. Designs can be validated quickly on the TPS7A84EVM-753 evaluation board before committing to a custom layout.
Recommended
Recommended Products Summary
Engineering reference data for TPS7A84 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS7A84A | TPS7A88 | TPS74401 |
|---|---|---|---|---|
| Package | VQFN-20 (RGR) | VQFN-20 (RGR) - same | VQFN-20 (RGR) - same | VQFN-20 (RGR) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 3 A | 3 A | [DATA_NEEDED] | 3 A |
| Maximum Dropout | 180 mV | [DATA_NEEDED: comparable low dropout] | [DATA_NEEDED] | [DATA_NEEDED] |
| Output Noise | 4.4 uVRMS at 0.8 V out | Improved noise vs TPS7A84 | [DATA_NEEDED] | [DATA_NEEDED] |
| Output Accuracy | 1% max over line, load, temp | Improved accuracy vs TPS7A84 | [DATA_NEEDED] | [DATA_NEEDED] |
| Output Voltage Programming | Pin-programmable 0.8-3.95 V, adjustable 0.8-5.0 V | Same scheme, enhanced version | [DATA_NEEDED] | Adjustable, 0.5 V reference |
| Automotive Grade Option | No | Not standard (check Q1 variants) | [DATA_NEEDED] | No |
Key Differentiators
- Ultra-low output noise for a 3 A LDO (vs TPS74401)
- Pin-programmable output simplifies platform designs (vs TPS74401)
- Low-VIN operation down to 1.1 V with BIAS (vs TPS7A84A)
Design Notes
Power dissipation equals (VIN - VOUT) x IOUT. At 3 A and 1 V dropout the device dissipates 3 W; the VQFN-20 exposed thermal pad must be soldered to a solid ground plane with an array of thermal vias to keep the junction within -40C to +125C. Refer to the TI datasheet thermal layout section for theta_JA guidance.
Use low-ESR ceramic capacitors (typically 10 uF) on both input and output, placed as close to the pins as possible. Connect the thermal pad to the ground plane using multiple vias. Follow the TPS7A84EVM-753 reference layout for optimized PSRR and noise performance.
Do not exceed the 6.5 V maximum input. When operating from inputs below 1.4 V, the BIAS pin must be tied to a higher rail (minimum 1.1 V VIN with BIAS). Do not omit the noise reduction capacitor if minimum output noise is required; omitting it degrades the 4.4 uVRMS specification.
Compliance Information
RoHS compliant per TI product page. REACH and halogen-free status not stated in provided data.
