Description 

The TPS7A85 is a low-noise (4.4 µVRMS), 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 µVRMS), highPSRR, 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 highperformance 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.

Features 

• Low Dropout: 150 mV (typ) at 4 A 

• 1% (max) Accuracy Over Line, Load, and Temperature 

• Output Voltage Noise: – 4.4 µVRMS at 0.8-V Output – 8.4 µVRMS 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 

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

TPS7A8500 Datasheet Download