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REG101UA-2.5/3K

更新时间: 2024-09-16 02:55:15
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德州仪器 - TI 稳压器
页数 文件大小 规格书
18页 401K
描述
DMOS 100mA Low-Dropout Regulator

REG101UA-2.5/3K 数据手册

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REG101  
REG101  
SBVS026D – JULY 2001 – REVISED SEPTEMBER 2005  
DMOS  
100mA Low-Dropout Regulator  
DESCRIPTION  
FEATURES  
The REG101 is a family of low-noise, low-dropout linear  
regulators with low ground pin current. Its new DMOS  
topology provides significant improvement over previous  
designs, including low dropout voltage (only 60mV typ at  
full load), and better transient performance. In addition, no  
output capacitor is required for stability, unlike conventional  
low-dropout regulators that are difficult to compensate and  
require expensive low ESR capacitors greater than 1µF.  
NEW DMOS TOPOLOGY:  
Ultra Low Dropout Voltage:  
60mV typ at 100mA  
Output capacitor NOT required for stability  
FAST TRANSIENT RESPONSE  
VERY LOW NOISE: 23µVrms  
HIGH ACCURACY: ±1.5% max  
HIGH EFFICIENCY:  
Typical ground pin current is only 500µA (at IOUT = 100mA)  
and drops to 10nA when not in enabled mode. Unlike regula-  
tors with PNP pass devices, quiescent current remains rela-  
tively constant over load variation and under dropout condi-  
tions.  
IGND = 500µA at IOUT = 100mA  
Not Enabled: IGND = 10nA  
2.5V, 2.8V, 2.85V, 3.0V, 3.3V, 5.0V, AND  
The REG101 has very low output noise (typically 23µVrms  
for VOUT = 3.3V with CNR = 0.01µF), making it ideal for use  
in portable communications equipment. Accuracy is main-  
tained over temperature, line, and load variations. Key  
parameters are tested over the specified temperature range  
(–40°C to +85°C).  
ADJUSTABLE OUTPUT VERSIONS  
OTHER OUTPUT VOLTAGES AVAILABLE  
UPON REQUEST  
FOLDBACK CURRENT LIMIT  
THERMAL PROTECTION  
The REG101 is well protected—internal circuitry provides a  
current limit that protects the load from damage. Thermal  
protection circuitry keeps the chip from being damaged by  
excessive temperature. The REG101 is available in the  
SOT23-5 and the SO-8 packages.  
SMALL SURFACE-MOUNT PACKAGES:  
SOT23-5 and SO-8  
APPLICATIONS  
PORTABLE COMMUNICATION DEVICES  
BATTERY-POWERED EQUIPMENT  
PERSONAL DIGITAL ASSISTANTS  
MODEMS  
BAR-CODE SCANNERS  
BACKUP POWER SUPPLIES  
Enable  
Enable  
VOUT  
VIN  
VOUT  
VIN  
REG101  
(Fixed Voltage  
Versions)  
+
R1  
Adj  
R2  
+
+
+
0.1µF  
(1)  
(1)  
COUT  
REG101-A  
COUT  
0.1µF  
NR  
Gnd  
Gnd  
NR = Noise Reduction  
NOTE: (1) Optional.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
Copyright © 2000-2005, Texas Instruments Incorporated  
www.ti.com  

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