1 Features

• Very low IQ: 6.5 μA

• Input voltage range: 2.0 V to 6.0 V

• Output voltage range: 0.8 V to 5.5 V (50-mV steps)

• High PSRR: 91 dB at 1 kHz

• Low output voltage noise: 7.7 μVRMS

• Low dropout:

– 265 mV (maximum) at 500 mA (2.5-V VOUT)

• Smart EN pulldown

• Output voltage tolerance: ±1 at 1 mA IOUT

• Supports a wide range of ceramic capacitors:

– 1 μF to 200 μF

• Operating junction temperature: –40°C to +150°C

• Package:

– 3-mm × 3-mm wettable flank VSON

2 Applications

• DAS cameras and radar

• Automotive infotainment

• Telematics systems

• Navigation systems

3 Description

The TPS7A21-Q1 is a small, low-dropout (LDO) linear

voltage regulator that can source 500 mA of output

current. The device provides low noise, high PSRR,

and excellent load and line transient performance

to meet the requirements of RF and other sensitive

analog circuits in automotive applications. Innovative

design techniques result in low-noise performance

without the addition of an external noise bypass

capacitor. The TPS7A21-Q1 low quiescent current

is a good choice for low-power systems. The 2.0-

V to 6.0-V input voltage range and 0.8-V to 5.5-V

output voltage range support a variety of system

requirements. The maximum output voltage tolerance

is 1.5, –2.25 over load, line, and temperature

variations.

An internal soft-start circuit helps control inrush

current, thus minimizing the input voltage drop during

start-up. The LDO is stable with small ceramic

capacitors, allowing for a small overall solution size.

A smart enable input circuit with an internally

controlled pulldown resistor keeps the LDO disabled

even when the EN pin is unconnected and helps

eliminate external components that are otherwise

required to pull down the EN input.