1 Features

1• Low Dropout: 150 mV (Typical) at 4 A

• 0.75% (Maximum) Accuracy Over Line, Load, and

Temperature With BIAS

• Output Voltage Noise:

– 4.4 μVRMS at 0.8-V Output

– 7.7 μVRMS at 5.1-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 5.1 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

• θJC = 3.4°C/W

• 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 TPS7A85A 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 5.1 V using an

external resistor divider.

The combination of low-noise (4.4 μVRMS), high-

PSRR, and high output current capability makes the

TPS7A85A 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 TPS7A85A 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), digitalto-

analog converters (DACs), and RF components.

Specifically, RF amplifiers benefit from the highperformance

and 5.1-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 TPS7A85A ensure optimal system

performance.

The versatility of the TPS7A8500A makes the device

a component of choice for many demanding

applications.