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RTQ2551A

更新时间： 2024-12-01 17:01:35
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立锜 - RICHTEK /
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22页 901K
描述
1A Ultra-Low Dropout Voltage LDO Regulators with Soft-Start

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RTQ2551A 数据手册

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RTQ2551A  
1A Ultra-Low Dropout Voltage LDO Regulators with Soft-  
Start  
1 General Description  
2 Features  
⚫ Ultralow V Range: 0.8V to 5.5V  
IN  
The RTQ2551A is a very low dropout linear regulator  
which operates from input voltage as low as 0.8V. The  
device is capable of supplying 1A of output current with  
a typical dropout voltage of only 50mV. 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.  
⚫ VBIAS Voltage Range: 2.7V to 5.5V  
⚫ VOUT Voltage Range: 0.8V to 3.6V  
⚫ Low Dropout: 50mV Typ. at 1A, V  
= 5V  
BIAS  
⚫ 2% Accuracy Over Line/Load/ Temperature  
⚫ PGOOD Indicator for Easy Sequence Control  
⚫ Programmable Soft-Start Provides Linear  
Voltage Startup  
⚫ Stable with Any Output Capacitor 2.2F  
⚫ Overcurrent and Over-Temperature Protection  
3 Applications  
⚫ PCs, Servers, Modems, and Set-Top-Boxes  
⚫ FPGAApplications  
The RTQ2551A is stable with output capacitor greater  
than or equal to 2.2F. A precise reference and error  
amplifier deliver 2% accuracy over load, line and  
temperature. Overcurrent limit and over-temperature  
protection are also included. The RTQ2551A is  
available in the WDFN-10L 3x3 package.  
⚫ DSP Core and I/O Voltages  
⚫ Instrumentation  
⚫ Post-Regulation Applications  
⚫ Applications With Sequencing Requirements  
The recommended junction temperature range is  
−40C to 125C.  
4 Simplified Application Circuit  
RTQ2551A  
VIN  
V
IN  
PGOOD  
R
PGOOD  
C
IN  
EN  
V
OUT  
VOUT  
C
OUT  
V
BIAS  
VBIAS  
R1  
C
BIAS  
FB  
SS  
R2  
C
SS  
GND  
Copyright © 2023 Richtek Technology Corporation. All rights reserved.  
is a registered trademark of Richtek Technology Corporation.  
DSQ2551A_DS-00 December 2023  
www.richtek.com  
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