1 Features
• AEC-Q100 qualified for automotive applications:
– Temperature grade 1: –40°C to +125°C
– Junction temperature: –40°C to +150°C
• Very low IQ: 6.5μA
• Input voltage range: 2.0V to 6.0V
• Output voltage range: 0.8V to 5.5V (50mV steps)
• High PSRR: 91dB at 1kHz
• Low output voltage noise: 7.7μVRMS
• Low dropout:
– 265mV (maximum) at 500mA (2.5V VOUT)
• Smart EN pulldown
• Output voltage tolerance: ±1% over temperature
• Supports a wide range of ceramic capacitors:
– 1μF to 200μF
• Package:
– 3mm × 3mm wettable flank VSON
– 2mm × 2mm wettable flank WSON
– 2mm × 2mm WSON (Advance Information)

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 sources 500mA 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 2.0V
to 6.0V input voltage range and 0.8V to 5.5V
output voltage range support a variety of system
requirements.
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. This circuit
also helps eliminate external components that are
otherwise required to pull down the EN input.