1 Features

• Low Dropout: 150 mV (typ) at 4 A
• 1% (max) Accuracy Over Line, Load, and Temperature
• Output Voltage Noise:
  • 4.4 µV_RMS at 0.8-V Output
  • 8.4 µV_RMS at 5.0-V Output
• Input Voltage Range:
  • Without BIAS: 1.4 V to 6.5 V
  • With BIAS: 1.1 V to 6.5 V
• ANY-OUT™ Operation:
  • Output Voltage Range: 0.8 V to 3.95 V
• Adjustable Operation:
  • Output Voltage Range: 0.8 V to 5.0 V
• 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
• Operating Temperature Range:
  –40ºC to +125°C
• 3.5-mm × 3.5-mm, 20-Pin VQFN

2 Applications

• Digital Loads: SerDes, FPGAs, and DSPs
• Instrumentation, Medical, and Audio
• High-Speed Analog Circuits:
  • VCO, ADC, DAC, and LVDS
• Imaging: CMOS Sensors and Video ASICs
• Test and Measurement

3 Description

The TPS7A85 is a low-noise (4.4 µV_RMS), low-dropout linear regulator (LDO) capable of sourcing 4 A with only 240 mV of maximum dropout. The device output voltage is 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.

The combination of low-noise (4.4 µV_RMS), high-PSRR, and high output current capability makes the TPS7A85 ideal to power noise-sensitive components such as those found in high-speed communications, video, medical, or test and measurement applications. The high performance of the TPS7A85 limits power-supply-generated phase noise and clock jitter, making this device ideal for powering high-performance serializer and deserializer (SerDes), analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and RF components. Specifically, RF amplifiers benefit from the high-performance and 5.0-V output capability of the device.

For digital loads [such as application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and digital signal processors (DSPs)] requiring low-input voltage, low-output (LILO) voltage operation, the exceptional accuracy (0.75% over load and temperature), remote sensing, excellent transient performance, and soft-start capabilities of the TPS7A85 ensure optimal system performance.

The versatility of the TPS7A85 makes the device a component of choice for many demanding applications.

1. For all available packages, see the orderable addendum at the end of the datasheet.

Powering RF Components

Powering Digital Loads