General Description
The RTQ2521A is a high-current (1.5A), low-noise
(7μVRMS), high accuracy (1% over line, load, and
temperature), low-dropout linear regulator (LDO) capable
of sourcing 1.5A with extremely low dropout (max. 110mV).
The device supports single input supply voltage as low to
1.1V that makes it easy to use.
The low noise, high PSRR and high output current capability
makes the RTQ2521A ideal to power noise-sensitive
devices such as analog-to-digital converters (ADCs),
digital-to-analog converters (DACs), and RF components.
With very high accuracy, remote sensing, and soft-start
capabilities to reduce inrush current, the RTQ2521A is
ideal for powering digital loads such as FPGAs, DSPs,
and ASICs.
The external enable control and power good indicator
function makes the sequence control easier. The output
noise immunity is enhanced by adding external bypass
capacitor on NR/SS pin. The device is fully specified over
the temperature range of TJ = −40°C to 125°C and is offered
in the WDFN-8EL 3x3 package.

Features
 Input Voltage Range : 1.1V to 6.5V
 Output Voltage Range : 0.5V to 5.5V
 Accurate Output Voltage Accuracy (1%) Over Line,
Load and Temperature
 Ultra High PSRR : 38dB at 500kHz
 Excellent Noise Immunity
7μVRMS at 0.5V Output
10μVRMS at 3.3V Output
 Ultra Low Dropout Voltage : 110mV at 1.5A
 Enable Control
 Programmable Soft-Start Output
 Stable with a 10μF or Larger Ceramic Output
Capacitor
 Support Power-Good Indicator Function
 RoHS Compliant and Halogen Free

Applications
 Portable Electronic Device
 Wireless Infrastructure : SerDes, FPGA, DSP
 RF, IF Components : VCO, ADC, DAC, LVDS