1 General Description
The RTQ2533E is a high-current (3A), low-noise
(6.8VRMS), high accuracy (1% over line, load, and
temperature), low-dropout linear regulator (LDO)
capable of sourcing 3A with an extremely low dropout
(maximum 180mV). The device supports a 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 make the RTQ2533E ideal to power noisesensitive 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
RTQ2533E 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 an 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 the VQFN-20L 3.5x3.5
package.

2 Features
⚫ Input Voltage Range: 1.1V to 6.5V
⚫ Two Output Voltage Modes
⚫ 0.5 V to 5.5V (Set by a Resistive Divider)
⚫ 0.5V to 2.075V (Set via PCB Layout, No
External Resistor Required)
⚫ Accurate Output Voltage Accuracy (1%) Over
Line, Load, and Temperature
⚫ PSRR: 44dB at 500kHz
⚫ Noise Immunity
⚫ 6.8VRMS at 0.5V Output
⚫ 16VRMS at 5V Output
⚫ Dropout Voltage: 180mV Maximum at 3A
⚫ Enable Control
⚫ Programmable Soft-Start Output
⚫ Stable with a 47F or Larger Ceramic Output
Capacitor
⚫ Support Power-Good Indicator Function
⚫ Junction Temperature Range: −40C to 125C

3 Applications
⚫ Portable Electronic Devices
⚫ Wireless Infrastructures: SerDes, FPGA, DSP
⚫ RD, IF, Components: VCO, ADC, DAC, LVDS