Overview
The TPS7A85, specifically the TPS7A8500RGRT model, is a high-performance, low-noise, low-dropout linear voltage regulator (LDO) from Texas Instruments. This device is capable of sourcing up to 4 A of current with a maximum dropout voltage of 240 mV. It features high accuracy, excellent power-supply ripple rejection, and low output voltage noise, making it ideal for powering noise-sensitive components in various demanding applications.
The TPS7A85 is available in a 20-pin VQFN (RGR) package and operates over a temperature range of –40°C to +125°C. The output voltage can be pin-programmable from 0.8 V to 3.95 V and adjustable from 0.8 V to 5.0 V using an external resistor divider.
Key Specifications
| Specification | Value |
|---|---|
| Package | VQFN (RGR), 20 pins |
| Operating Temperature Range | –40°C to +125°C |
| Input Voltage Range (Without BIAS) | 1.4 V to 6.5 V |
| Input Voltage Range (With BIAS) | 1.1 V to 6.5 V |
| Output Voltage Range (ANY-OUT) | 0.8 V to 3.95 V |
| Output Voltage Range (Adjustable) | 0.8 V to 5.0 V |
| Maximum Output Current | 4 A |
| Dropout Voltage (Typical at 4 A) | 150 mV |
| Output Voltage Noise (RMS at 0.8 V Output) | 4.4 µV |
| Output Voltage Noise (RMS at 5.0 V Output) | 8.4 µV |
| Power-Supply Ripple Rejection (at 500 kHz) | 40 dB |
| Output Capacitor Requirement | 47 µF or larger ceramic capacitor |
Key Features
- Low dropout voltage: 150 mV (typ) at 4 A
- High accuracy: 1% (max) over line, load, and temperature
- Low output voltage noise: 4.4 µV RMS at 0.8 V output and 8.4 µV RMS at 5.0 V output
- High power-supply ripple rejection: 40 dB at 500 kHz
- Excellent load transient response
- Adjustable soft-start in-rush control
- Open-drain power-good (PG) output
- Stable with a 47-µF or larger ceramic output capacitor
- ANY-OUT and adjustable output voltage configurations
- Remote sensing capability
Applications
The TPS7A85 is ideal for powering noise-sensitive components in various applications, including:
- High-speed communications
- Video and imaging systems
- Medical devices
- Test and measurement equipment
- High-performance serializer and deserializer (SerDes)
- Analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- RF components and RF amplifiers
- Digital loads such as ASICs, FPGAs, and DSPs requiring low-input voltage, low-output (LILO) voltage operation
Q & A
- What is the maximum output current of the TPS7A85?
The TPS7A85 can source up to 4 A of current.
- What is the typical dropout voltage of the TPS7A85 at 4 A?
The typical dropout voltage is 150 mV at 4 A.
- What is the output voltage noise of the TPS7A85 at 0.8 V output?
The output voltage noise is 4.4 µV RMS at 0.8 V output.
- What is the power-supply ripple rejection of the TPS7A85 at 500 kHz?
The power-supply ripple rejection is 40 dB at 500 kHz.
- What type of output capacitor is required for the TPS7A85?
A 47-µF or larger ceramic output capacitor is required.
- What is the operating temperature range of the TPS7A85?
The operating temperature range is –40°C to +125°C.
- Can the output voltage of the TPS7A85 be adjusted?
- What is the ANY-OUT feature of the TPS7A85?
The ANY-OUT feature allows the output voltage to be pin-programmable from 0.8 V to 3.95 V.
- Does the TPS7A85 have a power-good (PG) output?
- What are some typical applications of the TPS7A85?
The TPS7A85 is used in high-speed communications, video and imaging systems, medical devices, test and measurement equipment, and for powering high-performance SerDes, ADCs, DACs, and RF components.
