RTQ2522A Datasheet, PDF (1/16 Pages) Richtek Technology Corporation – Ultra-Low Dropout Voltage LDO Regulators

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RTQ2522A/B
2A Ultra-Low Dropout Voltage LDO Regulators with Soft-Start
General Description
The RTQ2522A/B is a very low dropout linear regulator
which operates from input voltage as low as 0.8V. The
device is capable of supplying 2A of output current with a
typical dropout voltage of only 135mV. A VBIAS supply is
required to run the internal reference and LDO circuitry
while output current comes directly from the VIN supply
for high efficiency regulation. User-programmable soft-start
limits the input inrush current and minimizes stress on
the input power. The enable input and power good output
allow easy sequencing with external regulators. This
complete flexibility provides an easy-to-use robust power
management solution for a wide variety of applications.
The RTQ2522A/B is stable with output capacitor greater
than or equal to 2.2μF. A precise reference and error
amplifier deliver 2% accuracy over load, line and
temperature. Over-current limit and over-temperature
protection are also included. The RTQ2522A/B is available
in the WDFN-10L 3x3 and WQFN-20L 5x5 packages.
Applications
 PCs, Servers, Modems, and Set-Top-Boxes
 FPGA Applications
 DSP Core and I/O Voltages
 Instrumentation
 Post-Regulation Applications
 Applications With Sequencing Requirements
Features
 Ultralow V_IN Range : 0.8V to 5.5V
 VBIAS Voltage Range : 2.7V to 5.5V
 VOUT Voltage Range : 0.8V to 3.6V
 Low Dropout : 135mV Typ at 2A, V_BIAS = 5V
 2% Accuracy Over Line/Load/ Temperature
 PGOOD Indicator for Easy Sequence Control
 Programmable Soft-Start Provides Linear Voltage
Startup
 Stable with Any Output Capacitor ≥ 2.2μF
 Over-Current and Over-Temperature Protection
Ordering Information
RTQ2522A/B
Pin 1 Orientation***
(2) : Quadrant 2, Follow EIA-481-D
Package Type
QW : WDFN-10L 3x3 (W-Type)
QW : WQFN-20L 5x5 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
A : WDFN-10L 3x3
B : WQFN-20L 5x5
Note :
***Empty means Pin1 orientation is Quadrant 1
Richtek products are :
 RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
 Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
V_IN
V_BIAS
C_IN
C_BIAS
C_SS
RTQ2522A/B
VIN PGOOD
EN
VBIAS
VOUT
SS
FB
GND
R_PGOOD
R1
V_OUT
C_OUT
R2
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DSQ2522A/B-00 April 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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