TPS73801DCQR - 1A, 20V Low-Noise LDO | Texas Instruments
N.º da peça: TPS73801DCQR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.45 | $2,45 |
| 10 | $2.2 | $22,00 |
| 100 | $1.86 | $186,00 |
| 500 | $1.58 | $790,00 |
| 1.000 | $1.32 | $1.320,00 |
TPS73801DCQR Visão geral
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. Unlike standard linear regulators, LDOs use a pass transistor with a low saturation voltage, allowing operation with minimal headroom. In the power management hierarchy, an LDO is a linear regulator, which is a voltage regulator, which falls under power management ICs used in virtually all electronic systems.
Key features include low output noise of 45 uVRMS (up to 100 kHz), a quiescent current of 1mA (dropping below 1uA in shutdown), and controlled quiescent current in dropout, which prevents unexpected current spikes. The device also provides reverse current and reverse voltage protection, eliminating external protection diodes. Its fast transient response minimizes output deviation during load steps, making it ideal for powering microprocessors, DSPs, and other digital loads.
Technically, the TPS73801 uses a PMOS pass element with a precision bandgap reference, achieving excellent line and load regulation. The adjustable output is set via an external resistor divider, and a shutdown (EN) pin supports power sequencing. The device is fully specified over the -40C to +125C junction temperature range.
Typical applications include point-of-load regulation for FPGAs, ASICs, and microcontrollers, plus noise-sensitive analog supplies for audio and RF circuits, precision ADC/DAC references, and PLL/VCO rails. The wide input range also supports industrial 24V bus systems with adequate headroom.
When designing with the TPS73801, ensure adequate input-to-output headroom to maintain regulation at all loads, and place input and output capacitors close to the device to minimize parasitic inductance and ensure stability.
Alternativas drop-in para TPS73801DCQR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com TPS73801DCQR (mesmo formato e footprint) — diferindo em Output Type, Package, Maximum Output Current, Automotive Qualification, Enable Pin.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
TPS73801QDCQRQ1
✅ Drop-In✓ Em estoque
$0.72 / unidade
Ver ficha técnica →TPS73701DCQR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS74801QDRCRQ1
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1 / unidade
Ver ficha técnica →TPS73801DCQR Classificações máximas e características elétricas
| Tipo de saída | Positive Adjustable |
| Faixa de tensão de saída | 1.21 V to 20 V |
| Corrente máxima de saída | 1 A |
| Faixa de tensão de entrada | 2.7 V to 20 V |
| Tensão de dropout | 300 mV at 1 A |
| Ruído de saída | 45 uVRMS (up to 100 kHz) |
| Corrente de repouso | 1 mA |
| Corrente de desligamento | < 1 uA |
| Protection Features | Reverse current and reverse voltage protection |
| Transient Response | Fast transient response |
| Temperatura de operação | -40C to +125C |
| Encapsulamento | SOT-223-6 (DCQ), 5+Tab |
| Tipo de montagem | Surface Mount |
| Topologia | PMOS pass element, bandgap reference |
| Pino de habilitação | Yes (shutdown/EN) |
| Número de saídas | 1 |
Configuração de pinos do TPS73801DCQR
| Pino 1 | EN/SD — Active-low shutdown/enable input |
| Pino 2 | IN — Input supply, 2.7V to 20V |
| Pino 3 | GND — Ground |
| Pino 4 | ADJ — Feedback adjustment pin for output voltage set point |
| Pino 5 | OUT — Regulated output, 1.21V to 20V |
| Pino 6 | TAB — Thermal tab, connected to GND |
Aplicações típicas
TPS73801DCQR é adequado para 6 aplicaçãos: FPGA/ASIC Point-of-Load Regulation, Audio Analog Supply, RF and PLL/VCO Power Rails, Industrial 24V Bus Post-Regulation, Precision ADC/DAC Reference Supplies, Battery-Powered Portable Systems.
FPGA/ASIC Point-of-Load Regulation
The TPS73801's fast transient response and 1.0A output make it ideal for powering FPGA core and I/O rails where load steps of hundreds of milliamps occur in microseconds. With 300mV dropout at full load, the device maintains regulation when fed from an upstream 3.3V or 5V switching converter output. Its adjustable 1.21V minimum output supports modern low-voltage cores, and the 45 uVRMS noise floor prevents jitter degradation on PLL supplies.
Recomendado
Audio Analog Supply
With 45 uVRMS output noise (up to 100 kHz) and a PMOS pass element, the TPS73801 delivers clean analog rails for audio codecs, op-amps, and headphone amplifiers. Placed after a 5V switching rail with 10uF ceramic output capacitance, it removes switching ripple without introducing its own noise. The reverse current protection prevents audio circuitry from back-feeding the regulator during power-down, avoiding audible pops.
Recomendado
RF and PLL/VCO Power Rails
RF synthesizers and VCOs demand low-noise, high-PSRR supplies because phase noise is directly coupled from the power rail. The TPS73801's 45 uVRMS noise and fast loop response suppress ripple from upstream buck converters, keeping PLL spurs low. Use the adjustable version set to 3.3V or 5V with a 0.1uF high-frequency bypass capacitor placed within 5mm of the VCO supply pin for best phase-noise performance.
Recomendado
Industrial 24V Bus Post-Regulation
The 20V maximum input supports post-regulation after industrial step-down converters on 24V-derived rails. Controlled quiescent current in dropout prevents current spikes during brownout events common on factory floors, and reverse voltage protection guards against wiring faults without external series diodes. At 1A output the SOT-223 tab dissipates heat effectively onto PCB copper, supporting power-dense DIN-rail and PLC I/O modules.
Recomendado
Precision ADC/DAC Reference Supplies
Precision data converters require quiet analog supplies to preserve effective resolution. The TPS73801's low noise floor and good line/load regulation keep supply-induced errors below the LSB level for 16-bit converters. Driving the converter AVDD from 5V with the TPS73801 set to a clean 5V, followed by a precision reference, is a proven TI reference design pattern for SAR and delta-sigma ADC front ends.
Recomendado
Battery-Powered Portable Systems
Operating from 2.7V input with only 1uA shutdown current, the TPS73801 suits battery-powered designs using 1-cell Li-Ion or multi-cell alkaline stacks. The EN/SD pin allows the system MCU to disconnect loads during sleep, and reverse current protection prevents battery back-charge through the output when input power is removed - eliminating external blocking diodes and their voltage drop, extending battery runtime.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para TPS73801DCQR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TPS73801QDCQRQ1 | TPS73701DCQR | TPS74801QDRCRQ1 | LT1963A |
|---|---|---|---|---|---|
| Package | SOT-223-6 (DCQ) | SOT-223-6 (DCQ) - same | SOT-223-6 (DCQ) - same | SOT-223-6 (DCQ) - same | SOT-223-5 - differs |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Output Current | 1 A | 1 A | 1 A | 1.5 A | 1.5 A |
| Input Voltage Range | 2.7 V to 20 V | 2.7 V to 20 V | 2.7 V to 20 V | 0.8 V to 5.5 V | 2.5 V to 20 V |
| Dropout Voltage | 300 mV at 1 A | 300 mV at 1 A | 400 mV at 1 A | 210 mV at 1.5 A | 340 mV at 1.5 A |
| Output Noise | 45 uVRMS | 45 uVRMS | 50 uVRMS | 55 uVRMS | 40 uVRMS |
| Quiescent Current | 1 mA (<1 uA shutdown) | 1 mA | 1.6 mA | 2.4 mA | 1 mA |
| Automotive Grade | No | Yes (AEC-Q1) | No | Yes (AEC-Q1) | No |
| Reverse Protection | Yes (current and voltage) | Yes | Yes | Yes | Reverse current only |
Principais diferenciais
- Fast transient response for digital loads (vs TPS73701DCQR)
- Automotive-qualified drop-in variant available (vs TPS73801QDCQRQ1)
- Full reverse current and reverse voltage protection (vs LT1963A)
Notas de projeto
At VIN=12V, VOUT=5V, 1A load, the TPS73801 dissipates 7W. The SOT-223 (DCQ) tab must be soldered to a substantial copper pour - at least 1 square inch of 2oz copper - for reliable operation. For continuous dissipation above 2W, verify junction temperature stays below 125C using datasheet theta-JA and layout derating curves, or reduce the input-to-output differential with an upstream buck stage.
Place a 10uF ceramic input capacitor and 10uF ceramic output capacitor within 5mm of the IN and OUT pins respectively. The TPS73801 is stable with low-ESR ceramic output capacitors; adding a 0.1uF bypass directly at the ADJ pin improves transient response. Keep the ADJ resistor divider trace short and away from switching nodes to avoid noise coupling into the feedback loop.
Do not exceed the 20V absolute maximum input rating - industrial transients on 24V bus systems must be clamped upstream. The EN/SD pin is active-low; pulling it high shuts down the device to under 1uA. When using the adjustable version, use 1% tolerance resistors for the ADJ divider to maintain output accuracy, and never float the ADJ pin during operation.
Informações de conformidade
RoHS compliant and lead-free per TI standard packaging. Use TPS73801QDCQRQ1 for AEC-Q1 automotive qualification.
