TPS73801DCQR - 1A, 20V Low-Noise LDO | Texas Instruments
料号： TPS73801DCQR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： TPS73801DCQR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TPS73801DCQR （相同外形与封装尺寸） ——差异在于 Output Type, Package, Maximum Output Current, Automotive Qualification, Enable Pin.
快速对比工具——选择替代料号进行并排对比：
TPS73801QDCQRQ1
✅ 直接替换✓ 有现货
$0.72 / 个
查看数据手册 →TPS73701DCQR
✅ 直接替换📋 参考替代料（不在目录中）
TPS74801QDRCRQ1
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1 / 个
查看数据手册 →TPS73801DCQR 最大额定值与电气特性
| 输出类型 | Positive Adjustable |
| 输出电压范围 | 1.21 V to 20 V |
| 最大输出电流 | 1 A |
| 输入电压范围 | 2.7 V to 20 V |
| 压差电压 | 300 mV at 1 A |
| 输出噪声 | 45 uVRMS (up to 100 kHz) |
| 静态电流 | 1 mA |
| 关断电流 | < 1 uA |
| Protection Features | Reverse current and reverse voltage protection |
| Transient Response | Fast transient response |
| 工作温度 | -40C to +125C |
| 封装 | SOT-223-6 (DCQ), 5+Tab |
| 安装类型 | Surface Mount |
| 拓扑 | PMOS pass element, bandgap reference |
| 使能引脚 | Yes (shutdown/EN) |
| 输出数量 | 1 |
TPS73801DCQR 引脚配置
| 引脚 1 | EN/SD — Active-low shutdown/enable input |
| 引脚 2 | IN — Input supply, 2.7V to 20V |
| 引脚 3 | GND — Ground |
| 引脚 4 | ADJ — Feedback adjustment pin for output voltage set point |
| 引脚 5 | OUT — Regulated output, 1.21V to 20V |
| 引脚 6 | TAB — Thermal tab, connected to GND |
典型应用
TPS73801DCQR 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： TPS73801DCQR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Fast transient response for digital loads （对比 TPS73701DCQR)
- Automotive-qualified drop-in variant available （对比 TPS73801QDCQRQ1)
- Full reverse current and reverse voltage protection （对比 LT1963A)
设计说明
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.
合规信息
RoHS compliant and lead-free per TI standard packaging. Use TPS73801QDCQRQ1 for AEC-Q1 automotive qualification.
