1 Features

1• Regulates Input-to-Output Voltage:

– User-Programmable Input-to-Output Voltage

Regulation Range:

200 mV to 500 mV

• Power-Supply Rejection Ratio:

– 42 dB at 1 MHz

– ≥ 32 dB (360 kHz to 3.9 MHz)

• Low-Noise Output:

– 3.8 μVRMS (10 Hz to 100 kHz)

• Output Current: Up to 1 A

• Output Voltage Range: 1.21 V to 4.5 V

• Excellent Load Transient Response

• Stable With Ceramic Capacitors as Low as

10 μF

• Current Limit and Thermal Shutdown for

Fault Protection

• Available in a Low Thermal Resistance Package: user2-

mm × 2-mm WSON-6

• Operating Temperature Range:

–40°C to 125°C

2 Applications

• Post DC-DC Converter Ripple Filtering

• Base Stations and Telecom Infrastructure

• Professional Audio

• Communications

• Imaging

• Test and Measurement

• Passive Filter Replacement

3 Description

The TPS7A3501 is a positive voltage, low-noise

(3.8-μVRMS) power filter capable of sourcing a 1-A load suitable for quiet supply solutions. Power filters,

such as the TPS7A3501, provide voltage regulation

across the input and output terminals with high

efficiency (low insertion loss), and power-supply

rejection. The device is ideally suited as a noise filter

for 3.3-V, 2.5-V, and 1.8-V supplies at up to 1 A.

The input-to-output voltage regulation is also user2-

programmable, from 200 mV to 500 mV, with a single

external resistor. If no resistor is used, the

TPS7A3501 provides 330 mV of input-to-output

voltage regulation. The device is stable with 10-μF

input and output ceramic capacitors and a 10-nF

noise-reduction ceramic capacitor.

The TPS7A3501 is fully specified over a wide

temperature of –40°C to 125°C. The device is offered

in a low thermal resistance, 2-mm × 2-mm, WSON-6

package. Unlike passive filters, the TPS7A3501

provides thermal and current protection for itself and

surrounding circuitry.