Texas Instruments TPS7A47 Ultra-rauscharmer LDO-Regler im TO-220-Gehäuse

High-Performance LDO Regulator for Precision Applications

The **TPS7A47** is a high-accuracy, low-noise, low-dropout (LDO) linear voltage regulator developed by **Texas Instruments (TI)**. Designed for demanding analog and RF applications, this device delivers exceptional performance in terms of power supply rejection ratio (PSRR), output noise, and load regulation. With a wide input voltage range and robust thermal performance, it is ideal for powering sensitive analog circuitry in industrial, medical, and communications systems.

Technischer Überblick und Hauptmerkmale

The **TPS7A47** is engineered to meet the stringent requirements of high-precision systems. It supports an input voltage range from 3 V to 36 V and provides an adjustable output voltage from 1.4 V to 20.5 V. The device offers a maximum output current of 1 A, making it suitable for a wide range of power management applications.

Key features include:

• Ultra-low output noise: 4 µVRMS (10 Hz to 100 kHz)
• High PSRR: 72 dB at 1 kHz
• Excellent load and line regulation
• Adjustable soft-start for inrush current control
• Thermal shutdown and current limit protection

Technische Daten

Parameter	Wert
Eingangsspannungsbereich	3 V to 36 V
Ausgangsspannungsbereich	1.4 V to 20.5 V (adjustable)
Ausgang Strom	Up to 1 A
Ausgangsrauschen	4 µVRMS (10 Hz to 100 kHz)
PSRR	72 dB at 1 kHz
Rückfallspannung	300 mV at 1 A
Betriebstemperaturbereich	–40°C to +125°C
Paket-Optionen	TO-220, TO-263, and WSON

Why This LDO Regulator Outperforms Typical Alternatives

The **TPS7A47** stands out in the market due to its combination of **ultra-low noise**, **high PSRR**, and **wide input voltage range**. Unlike standard LDO regulators that often compromise between noise and dropout performance, this device delivers both. Its 4 µVRMS output noise ensures minimal interference in sensitive analog signal chains, while the 72 dB PSRR at 1 kHz effectively filters out power supply ripple and noise.

Additionally, the adjustable soft-start feature allows for controlled power-up, reducing inrush current and protecting downstream components. The thermal shutdown and current limit protections enhance system reliability, especially in industrial environments where thermal management is critical.

Typical Applications in Industrial and Analog Systems

The **TPS7A47** is optimized for applications that demand **clean, stable power**. It is widely used in:

• High-speed data converters (ADCs/DACs)
• Precision amplifiers and analog front ends
• Medical imaging systems
• Test and measurement equipment
• RF and wireless communication modules
• Industrial automation and control systems

Its high PSRR and low noise make it particularly suitable for powering **low-noise analog circuits**, where power supply quality directly impacts signal integrity.

Texas Instruments: A Trusted Name in Power Management

**Texas Instruments (TI)** is a global leader in analog and embedded processing solutions. With decades of experience in power management, TI is known for delivering reliable, high-performance components that meet the needs of industrial, automotive, and communications markets. The **TPS7A47** is part of TI’s extensive portfolio of LDO regulators, backed by comprehensive documentation, reference designs, and long-term product support.

Expert Endorsements and Industry Trust

Engineers and system designers consistently choose the **TPS7A47** for its **proven performance** in real-world applications. According to a senior analog design engineer at a leading test equipment manufacturer:

“We rely on the TPS7A47 for our precision analog modules. Its low noise and high PSRR are unmatched, and it has become our go-to LDO for sensitive analog rails.”

This level of trust from industry professionals underscores the device’s **reliability and performance** in mission-critical systems.

Häufig gestellte Fragen (FAQ)

What is the maximum output current supported by this LDO regulator?

The device supports a maximum output current of 1 A, making it suitable for powering a wide range of analog and RF circuits that require stable and clean voltage rails.

Can this regulator be used in high-temperature industrial environments?

Yes, it operates over a wide temperature range from –40°C to +125°C, making it ideal for industrial and outdoor applications where thermal conditions can vary significantly.

How does the low output noise benefit analog systems?

Low output noise (4 µVRMS) minimizes interference in sensitive analog circuits, such as ADCs and amplifiers, ensuring higher signal fidelity and improved overall system performance.

Is the output voltage adjustable?

Yes, the output voltage is adjustable from 1.4 V to 20.5 V using external resistors, providing flexibility for various system requirements and voltage rails.

What protection features are included in this device?

The regulator includes thermal shutdown and current limit protection, which safeguard the device and downstream components from damage due to overheating or overcurrent conditions.

Schlussfolgerung

The **TPS7A47** is a high-performance LDO regulator that delivers **exceptional noise performance**, **robust protection features**, and **flexible voltage configuration**. Backed by **Texas Instruments’** reputation for quality and innovation