TPS7A4700 Ultra-Low Noise 1A LDO Voltage Regulator – Precision Analog Power Solution by Texas Instruments
O TPS7A4700 from Texas Instruments is a high-performance, low dropout (LDO) linear regulator designed specifically to power precision analog circuits. With an ultra-low output noise of only 4 µVRMS (10 Hz to 100 kHz) and excellent power-supply rejection ratio (PSRR), this device is the go-to choice for applications where signal purity is paramount.
This regulator provides a maximum output current of 1A and supports a wide input voltage range of 3V to 36V, with an adjustable output from 1.4V to 20.5V via external resistors. It integrates robust features like internal current limit, thermal shutdown, and foldback current limiting for enhanced system protection. The TPS7A4700 is available in thermally efficient packages including TO-220, TO-263, and VSON-8, ensuring mechanical and thermal design flexibility.
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🔧 Technical Specifications
| Parâmetro | Valor | Unidade |
|---|---|---|
| Gama de tensão de saída | 1.4 – 20.5 | V |
| Corrente máxima de saída | 1 | A |
| Gama de tensão de entrada | 3 – 36 | V |
| Output Noise (10 Hz – 100 kHz) | 4 | µVRMS |
| Power Supply Rejection Ratio (1 kHz) | 66 | dB |
| Dropout Voltage (at 1A) | < 385 | mV |
| Gama de temperaturas de funcionamento | -40 to 125 | °C |
| Packages | TO-220, TO-263, VSON-8 | – |
🌟 Key Features and Advantages
- Ultra-Low Noise: With only 4 µVRMS, it minimizes interference in sensitive analog applications.
- High PSRR: 66 dB rejection at 1 kHz enhances accuracy in audio and precision measurements.
- Flexible Output: Adjustable range from 1.4 V to 20.5 V provides wide design flexibility.
- Protection Mechanisms: Thermal shutdown, current limit, and foldback ensure safe operation.
- Package Versatility: Offers VSON-8 for space-sensitive applications or TO-220 for high heat dissipation.
📌 Typical Applications
- High-resolution ADC and DAC power supplies
- Precision operational amplifier biasing
- Low-noise RF circuits and PLLs
- Medical instrumentation systems
- High-end audio systems
🏆 Texas Instruments Quality & Trust
As a product from Texas Instruments, the TPS7A4700 is built for mission-critical designs. It is widely trusted in aerospace, industrial, and medical-grade systems. Engineers favor it for its stable, quiet, and consistent performance across temperature extremes and fluctuating loads.
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📚 Frequently Asked Questions (FAQ)
1. What makes the TPS7A4700 ideal for powering analog circuits?
Its ultra-low output noise and high PSRR protect sensitive analog circuitry from power supply fluctuations and EMI, maintaining signal accuracy.
2. Can this LDO be used in audio applications?
Yes. Its low output noise is excellent for high-fidelity audio systems, where clean power directly affects signal clarity and performance.
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3. How is the output voltage configured?
It’s adjustable via a resistor divider between the output and the FB (feedback) pin. This allows precision voltage tuning for your system’s needs.
4. Is the TPS7A4700 protected against overcurrent and thermal stress?
Absolutely. It features internal current limiting, thermal shutdown, and foldback current protection to prevent damage in fault conditions.
5. Does it support battery-powered designs?
While it’s more optimized for line-powered systems, its low dropout voltage and noise performance still make it usable in regulated battery scenarios requiring clean analog power.
