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LTC3025-3_15 PDF预览

LTC3025-3_15

更新时间： 2024-02-10 02:44:23
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
14页 255K
描述
500mA Micropower VLDO Linear Regulators

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LTC3025-3_15 数据手册

 浏览型号LTC3025-3_15的Datasheet PDF文件第2页浏览型号LTC3025-3_15的Datasheet PDF文件第3页浏览型号LTC3025-3_15的Datasheet PDF文件第4页浏览型号LTC3025-3_15的Datasheet PDF文件第5页浏览型号LTC3025-3_15的Datasheet PDF文件第6页浏览型号LTC3025-3_15的Datasheet PDF文件第7页 
LTC3025-1/LTC3025-2/  
LTC3025-3/LTC3025-4  
500mA Micropower  
VLDO Linear Regulators  
FeaTures  
DescripTion  
The LTC®3025-X is a micropower, VLDO™ (very low drop-  
out)linearregulatorwhichoperatesfrominputvoltagesas  
low as 0.9V. The device is capable of supplying 500mA of  
outputcurrentwithatypicaldropoutvoltageofonly85mV.  
A BIAS supply is required to run the internal reference and  
LDOcircuitrywhileoutputcurrentcomesdirectlyfromthe  
IN supply for high efficiency regulation. The LTC3025-1  
features an adjustable output with a low 0.4V reference  
while the LTC3025-2, LTC3025-3, and LTC3025-4 have  
fixed 1.2V, 1.5V and 1.8V output voltages respectively.  
n
Wide Input Voltage Range: 0.9V to 5.5V  
n
Stable with Ceramic Capacitors  
n
Very Low Dropout: 85mV at 500mA  
n
Adjustable Output Range: 0.4V to 3.6V (LTC3025-1)  
n
Fixed Output: 1.2V (LTC3025-2), 1.5V (LTC3025-3),  
1.8V (LTC3025-4)  
2ꢀ Voltage Accuracy over Temperature,  
Supply and Load  
Low Noise: 80µV  
n
n
(10Hz to 100kHz)  
RMS  
n
n
n
n
n
n
n
n
BIAS Voltage Range: 2.5V to 5.5V  
Fast Transient Recovery  
The LTC3025-X’s low quiescent current makes it an ideal  
choiceforuseinbattery-poweredsystems.For3-cellNiMH  
and single cell Li-Ion applications, the BIAS voltage can  
be supplied directly from the battery while the input can  
come from a high efficiency buck regulator, providing a  
high efficiency, low noise output.  
Shutdown Disconnects Load from V and V  
IN  
BIAS  
= 50µA Typ  
= 0.01µA Typ  
Low Operating Current: I = 4µA, I  
Low Shutdown Current: I = 1µA, I  
Output Current Limit  
Thermal Overload Protection  
Available in 6-Lead (2mm × 2mm) DFN Package  
IN  
BIAS  
IN  
BIAS  
Other features include high output voltage accuracy,  
excellent transient response, stability with ultralow ESR  
ceramic capacitors as small as 1µF, short-circuit and  
thermal overload protection and output current limiting.  
The LTC3025-X is available in a tiny, low profile (0.75mm)  
6-lead DFN (2mm × 2mm) package.  
applicaTions  
n
Low Power Handheld Devices  
n
Low Voltage Logic Supplies  
n
DSP Power Supplies  
Cellular Phones  
Portable Electronic Equipment  
Handheld Medical Instruments  
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO  
and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents including 7224204, 7218082.  
n
n
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Post Regulator for Switching Supply Noise Rejection  
Typical applicaTion  
1MHz VIN Supply Rejection  
1.2V Output Voltage from 1.5V Input Supply  
50  
45  
40  
35  
30  
25  
20  
15  
10  
5
C
= 10µF  
OUT  
V
= 1.2V  
≤ 500mA  
OUT  
OUT  
BIAS  
OUT  
SENSE  
GND  
I
0.1µF  
1µF  
Li-Ion  
OR  
1.5V HIGH  
EFFICIENCY  
DC/DC  
LTC3025-2  
C
= 1µF  
OUT  
1.5V  
3-CELL  
NiMH  
IN  
BUCK  
0.1µF  
OFF ON  
SHDN  
30251234 TA01  
BIAS = 3.6V  
OUT  
I
I
= 100mA  
= 300mA  
OUT  
OUT  
V
= 1.2V  
0
1.2  
1.6 1.8 2.0  
(V)  
2.2 2.4 2.6  
1.4  
V
IN  
30251234 TA01b  
30251234ff  
1
1234567...14

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