1 Features

1• Input Voltage Range: +3 V to +36 V

• Output Voltage Noise:

4 μVRMS (10 Hz, 100 kHz)

• Power-Supply Ripple Rejection:

– 82 dB (100 Hz)

– ≥ 55 dB (10 Hz, 10 MHz)

• Two Output Voltage Modes:

– ANY-OUT™ Version (User-Programmable

Output via PCB Layout):

– No External Feedback Resistors or Feed-

Forward Capacitors Required

– Output Voltage Range: +1.4 V to +20.5 V

– Adjustable Version (TPS7A4701 only):

– Output Voltage Range: +1.4 V to +34 V

• Output Current: 1 A

• Dropout Voltage: 307 mV at 1 A

• CMOS Logic Level-Compatible Enable Pin

• Built-In Fixed Current Limit and

Thermal Shutdown

• Available in High-Performance Thermal Package:

5-mm × 5-mm QFN

• Operating Temperature Range:

–40°C to 125°C

and2

Applications

• Voltage-Controlled Oscillators (VCO)

• Frequency Synthesizers

• Test and Measurement

• Instrumentation, Medical, and Audio

• RX, TX, and PA Circuitry

• Supply Rails for Operational Amplifiers,

DACs, ADCs, and Other High-Precision Analog

Circuitry

• Post DC-DC Converter Regulation and

Ripple Filtering

• Base Stations and Telecom Infrastructure

• +12-V and +24-V Industrial Buses

3 Description

The TPS7A47 is a family of positive voltage (+36 V),

ultralow-noise (4 μVRMS) low-dropout linear regulators (LDO) capable of sourcing a 1-A load.

The TPS7A4700 output voltages are user- programmable (up to 20.5 V) using a printed circuit

board (PCB) layout without the need of external

resistors or feed-forward capacitors, thus reducing

overall component count.

The TPS7A4701 output voltage can be configured

with a user-programmable PCB layout (up to 20.5 V),

or adjustable (up to 34 V) with external feedback

resistors.

The TPS7A47 is designed with bipolar technology

primarily for high-accuracy, high-precision

instrumentation applications where clean voltage rails

are critical to maximize system performance. This

feature makes the device ideal for powering

operational amplifiers, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and

other high-performance analog circuitry in critical

applications such as medical, radio frequency (RF),

and test-and-measurement.

In addition, the TPS7A47 is ideal for post dc-dc

converter regulation. By filtering out the output

voltage ripple inherent to dc-dc switching

conversions, maximum system performance is ensured in sensitive instrumentation, test-and2

measurement, audio, and RF applications.

For applications where positive and negative low- noise rails are required, consider TI's TPS7A33 family

of negative high-voltage, ultralow-noise linear

regulators.