General Description
The RTQ2539A is a high-current (3A), low-noise
(6.8μVRMS), high accuracy (1% over line, load, and
temperature), low-dropout linear regulator (LDO) capable
of sourcing 3A with extremely low dropout (max. 180mV).
The device supports single input supply voltage as low to
1.1V, which makes it easy to use.
The low-noise, high PSRR and high output current capability
makes the RTQ2539A 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 RTQ2539A is
ideal for powering digital loads such as FPGAs, DSPs,
and ASICs.
The external enable control and power good indicator
function make the control sequence easier. The output
noise immunity is enhanced by adding external bypass
capacitor on the NR/SS pin. The device is fully specified
over the temperature range of TJ = −40°C to 125°C and is
offered in a WQFN-12L 2.2x2.5 (FC) package.

Features
 Input Voltage Range : 1.1V to 6.5V
 Output Voltage Range : 0.8 V to 5.5V
 Accurate Output Voltage Accuracy (1%) Over Line,
Load and Temperature
 Ultra High PSRR : 40dB at 500kHz
 Excellent Noise Immunity
6.8μVRMS at 0.8V Output
10μVRMS at 3.3V Output
 Ultra Low Dropout Voltage : 180mV at 3A
 Enable Control
 Programmable Soft-Start Output
 Stable with a 47μF or Larger Ceramic Output
Capacitor
 Support Power-Good Indicator Function
 RoHS Compliant and Halogen Free

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