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