Overview
The TPS7A85A, specifically the TPS7A8500ARGRR model from Texas Instruments, is a high-performance, low-noise, ultra-low-dropout linear regulator (LDO) designed to meet the demands of various noise-sensitive applications. This device is capable of sourcing up to 4 A with a maximum dropout voltage of 240 mV, making it ideal for powering high-speed communications, video, medical, and test and measurement equipment. The TPS7A85A features high accuracy, excellent transient performance, and adjustable soft-start capabilities, ensuring optimal system performance in low-input voltage, low-output (LILO) voltage conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Current | 4 | A |
| Maximum Dropout Voltage | 240 | mV |
| Accuracy Over Line, Load, and Temperature | 0.75% (Maximum) | |
| Output Voltage Noise | 4.4 µV RMS at 0.8 V, 7.7 µV RMS at 5.1 V | |
| Input Voltage Range | 1.1 V to 6.5 V (with BIAS), 1.4 V to 6.5 V (without BIAS) | |
| Output Voltage Range | 0.8 V to 3.95 V (pin-programmable), 0.8 V to 5.1 V (adjustable) | |
| Power-Supply Rejection Ratio (PSRR) | 40 dB at 500 kHz | |
| Package | 20-Pin VQFN (RGR) | |
| Operating Temperature Range | -40°C to 125°C |
Key Features
- Low dropout voltage: 240 mV maximum at 4 A.
- High accuracy: 0.75% over line, load, and temperature with BIAS.
- Low noise: 4.4 µV RMS at 0.8 V output.
- ANY-OUT™ programmable output voltage: 0.8 V to 3.95 V pin-programmable, 0.8 V to 5.1 V adjustable using an external resistor divider.
- High PSRR: Greater than 40 dB at 500 kHz.
- Excellent load transient response and adjustable soft-start in-rush control.
- Open-drain power-good (PG) output.
- Stable with a 47-µF or larger ceramic output capacitor.
Applications
- Digital loads: SerDes, FPGAs, DSPs, and ASICs requiring low-input voltage, low-output (LILO) voltage operation.
- Instrumentation, medical, and audio applications.
- High-speed analog circuits: VCO, ADC, DAC, LVDS, and RF components.
- Imaging: CMOS sensors and video ASICs.
- Test and measurement systems.
Q & A
- What is the maximum output current of the TPS7A85A?
The TPS7A85A can source up to 4 A of output current.
- What is the maximum dropout voltage of the TPS7A85A?
The maximum dropout voltage is 240 mV.
- What is the accuracy of the TPS7A85A over line, load, and temperature?
The accuracy is 0.75% maximum over line, load, and temperature with BIAS).
- What is the output voltage noise of the TPS7A85A?
The output voltage noise is 4.4 µV RMS at 0.8 V output and 7.7 µV RMS at 5.1 V output).
- What is the input voltage range of the TPS7A85A?
The input voltage range is 1.1 V to 6.5 V with BIAS and 1.4 V to 6.5 V without BIAS).
- How can the output voltage of the TPS7A85A be programmed?
The output voltage can be programmed from 0.8 V to 3.95 V using the ANY-OUT™ feature and up to 5.1 V using an external resistor divider).
- What is the PSRR of the TPS7A85A?
The PSRR is greater than 40 dB at 500 kHz).
- Does the TPS7A85A have a power-good (PG) output?
Yes, the TPS7A85A has an open-drain power-good (PG) output).
- What type of capacitors are recommended for the output of the TPS7A85A?
A 47-µF or larger ceramic output capacitor is recommended).
- What are some common applications of the TPS7A85A?
Common applications include digital loads, instrumentation, medical and audio, high-speed analog circuits, imaging, and test and measurement systems).
