TPS7A84 - 3A Low-Noise High-Accuracy LDO | Texas Instruments
N.º da peça: TPS7A84 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.2 | $5,20 |
| 10 | $4.68 | $46,80 |
| 100 | $4.15 | $415,00 |
| 500 | $3.72 | $1.860,00 |
| 1.000 | $3.3 | $3.300,00 |
TPS7A84 Visão geral
An LDO (low-dropout) linear regulator is a voltage regulator that maintains a stable output even when input voltage is very close to the output. As a subclass of linear regulators, LDOs use a pass transistor in its linear region and are essential power management ICs, providing clean, low-noise rails for sensitive analog and digital loads. Hierarchy: LDO -> linear regulator -> voltage regulator -> power management IC.
Key features include 3 A output current, 180 mV maximum dropout, 4.4 uVRMS output noise (0.8 V output) and 7.7 uVRMS at 5.0 V output, and 1% maximum output accuracy over line, load, and temperature. High PSRR rejects upstream switching-converter ripple, and pin-programmable output voltages eliminate external feedback resistors. The BIAS pin enables operation from inputs as low as 1.1 V.
Internally, a precision bandgap reference and low-noise architecture deliver the accuracy and noise performance. Current limit and thermal shutdown protect against faults, while the exposed thermal pad of the 20-pin VQFN (RGR) package supports full 3 A delivery with proper PCB layout. Junction temperature range is -40C to +125C.
Typical applications include powering FPGAs, DSPs, ASICs, SerDes, PLLs, VCOs, and high-speed ADCs/DACs in communications, video processing, medical imaging, and test equipment. Low noise limits power-supply-generated phase noise and clock jitter.
Design tip: ensure adequate input-output headroom, use low-ESR ceramic capacitors, connect BIAS to a higher rail to reduce dropout, and manage thermals at high current and large dropout voltages.
Alternativas drop-in para TPS7A84 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
TPS7A84A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS7A8300QRGRRQ1
✅ Drop-In✓ Em estoque
$1.05 / unidade
Ver ficha técnica →TPS74401
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS7A88
⚡ Mesmo encapsulamento📋 Alternativa de referência (fora do catálogo)
TPS7A53B
⚡ Mesmo encapsulamento📋 Alternativa de referência (fora do catálogo)
LT3045
⚡ Mesmo encapsulamento ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
TPS7A84 Classificações máximas e características elétricas
| Output Current | 3 A |
| Output Voltage Range (Pin-Programmable) | 0.8 V to 3.95 V |
| Output Voltage Range (Adjustable) | 0.8 V to 5.0 V |
| Input Voltage (no BIAS) | 1.4 V to 6.5 V |
| Input Voltage (with BIAS) | 1.1 V to 6.5 V |
| Tensão de dropout | 180 mV (max) |
| Ruído de saída | 4.4 uVRMS (0.8 V out); 7.7 uVRMS (5.0 V out) |
| Output Accuracy | 1% (max) over line, load, temperature |
| PSRR | High PSRR (see datasheet curves) |
| Saída Power Good | Yes |
| Temperatura de operação | -40C to +125C (TJ) |
| Encapsulamento | VQFN-20 (RGR) with exposed thermal pad |
| Tipo de montagem | Surface Mount |
| Protection Features | Current limit, thermal shutdown |
| Configuração de saída | Positive, adjustable or pin-programmable |
Configuração de pinos do TPS7A84
| Pino 1 | IN — Input supply voltage |
| Pino 2 | IN — Input supply voltage |
| Pino 3 | BIAS — Bias rail for internal circuitry; enables low-VIN operation (1.1 V min with BIAS) |
| Pino 4 | EN — Enable control input |
| Pino 5 | PG — Power-good open-drain output |
| Pino 6 | FB — Feedback input for adjustable output (0.8 V to 5.0 V) |
| Pino 7 | VSET — Pin-programmable output voltage select |
| Pino 8 | GND — Ground |
| Pino 9 | OUT — Regulated output voltage |
| Pino 10 | OUT — Regulated output voltage |
| Pino 11 | NC/OUT — Output sense connection (see datasheet) |
| Pino 12 | PAD — Exposed thermal pad - must be soldered to ground plane |
Aplicações típicas
TPS7A84 é adequado para 6 aplicaçãos: FPGA Core and Analog Rail Power, SerDes and Clock Jitter-Sensitive Rails, High-Speed ADC and DAC Analog Supply, Medical Imaging Equipment, Test and Measurement Instrumentation, Video and Broadcast Processing.
FPGA Core and Analog Rail Power
The TPS7A84's 3 A output and 180 mV maximum dropout make it ideal for post-regulating FPGA core and analog rails from nearby switching converters. Its 4.4 uVRMS noise and high PSRR keep power-supply-induced jitter out of FPGA transceiver clocks, while 1% accuracy keeps cores within tight voltage windows. Place the LDO between the DC-DC stage and the FPGA bank with 10 uF low-ESR ceramics; the pin-programmable output from 0.8 V to 3.95 V lets one PCB footprint support multiple voltage banks without feedback resistor changes, simplifying platform BOMs.
Recomendado
SerDes and Clock Jitter-Sensitive Rails
Power-supply noise directly converts to phase noise and clock jitter in SerDes and PLL circuits. The TPS7A84's 4.4 uVRMS output noise and high PSRR filter upstream buck ripple before it reaches SerDes analog supplies, protecting eye margins in high-speed communications links. TI's datasheet explicitly targets SerDes power with this device. Use the BIAS pin tied to a 3.3 V or 5 V rail so the pass element operates with adequate headroom even from low-VIN rails, and keep the PG output for power-rail sequencing supervision in multi-rail transceiver systems.
Recomendado
High-Speed ADC and DAC Analog Supply
Precision data converters degrade SNR and SFDR when supply noise couples into reference and analog supply pins. The TPS7A84's 1% output accuracy over line, load, and temperature keeps converter headroom stable, while 4.4 uVRMS noise preserves noise floor. Post-regulate a 5 V or 3.3 V switching rail down to the converter AVDD pin, adding 0.1 uF high-frequency bypass at each supply pin. The thermal pad supports 3 A delivery for multi-channel converters, and current limit plus thermal shutdown protect expensive converters during fault conditions.
Recomendado
Medical Imaging Equipment
Medical imaging front ends - ultrasound beamformers, CT detector channels - combine high current with extreme noise sensitivity. The TPS7A84 supplies up to 3 A with ultra-low output noise, keeping supply artifacts out of weak receive-chain signals, and its 1% accuracy supports precise biasing of analog front-end ICs. TI's product page lists medical as a target market. Industrial-grade thermal management with the exposed-pad VQFN-20 handles continuous imaging duty cycles; the power-good output enables safe startup sequencing for patient-safety interlocked subsystems.
Recomendado
Test and Measurement Instrumentation
Oscilloscope front ends, signal generators, and spectrum analyzers demand rails with minimal phase-noise contribution. The TPS7A84 limits power-supply-generated phase noise per TI documentation, making it suitable for oscillator and synthesizer supplies in bench instruments. Its pin-programmable outputs (0.8 V to 3.95 V) let a single PCB design serve multiple instrument variants, cutting qualification cost. Use low-ESR ceramic capacitors per datasheet recommendations and reserve headroom for the 3 A transient loads typical of pulsed measurement circuitry.
Recomendado
Video and Broadcast Processing
High-speed video signal chains - HDMI/SDI equalizers, crosspoint switches, video DACs - are sensitive to supply-borne ripple that appears as visible banding or sampling clock jitter. The TPS7A84's combination of 3 A capability and 4.4 uVRMS noise powers several video channel loads from one regulator. TI identifies video as a key application market. Set the output by pin-programming for standard 1.8 V or 3.3 V video rails, and rely on the high PSRR to reject noise from a shared switching supply feeding the whole board.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para TPS7A84 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TPS7A84A | TPS7A8300QRGRRQ1 | TPS74401 | TPS7A88 |
|---|---|---|---|---|---|
| Package | VQFN-20 (RGR) | VQFN-20 (RGR) - same | VQFN-20 (RGR) - same | VQFN-20 - same footprint | VQFN-20 - same family |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 3 A | 3 A | 3 A | 3.5 A | 3 A per channel (dual) |
| Automotive Grade (AEC-Q100) | No | No | Yes (Q1) | No | No |
| Power Good Output | Yes | Yes | Yes (PGOOD) | Yes (PGOOD) | Yes |
Principais diferenciais
- Pin-programmable output without feedback resistors (vs TPS74401)
- Best-in-class 4.4 uVRMS noise at 3 A (vs TPS7A8300QRGRRQ1)
- 180 mV maximum dropout at 3 A (vs TPS7A84A)
Notas de projeto
At 3 A load, dissipation equals (VIN - VOUT) x 3 A. With 2.5 V dropout that is 7.5 W - far beyond what the VQFN-20 theta-JA allows without heavy thermal management. Best practice is to post-regulate from a switcher set 300-500 mV above the LDO output. Solder the exposed pad to at least 1 square inch of 2 oz copper with an array of thermal vias; without it, full 3 A delivery is not achievable.
Place 10 uF low-ESR ceramic capacitors at IN and OUT as close to the pins as possible, with 0.1 uF in parallel for high-frequency bypass per TI datasheet recommendations. Use Kelvin connections for the FB sense trace so it does not carry load current. Connect BIAS to a stable higher rail (3.3 V or 5 V) when VIN is near the output to guarantee headroom for internal circuitry.
Do not exceed the 6.5 V maximum input. If using the adjustable mode, set FB divider current low but not so low that leakage dominates; 1% resistors preserve the 1% output accuracy. When migrating to TPS7A84A, verify power-good polarity and startup behavior in your sequencing scheme - performance improvements can slightly shift timing. Avoid omitting the PG pull-up resistor.
Informações de conformidade
Compliance details not present in provided web data; consult TI product page quality data for RoHS/REACH certificates.
