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LTC3025-1 PDF预览

LTC3025-1

更新时间: 2024-01-11 10:33:03
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
12页 183K
描述
500mA Micropower VLDO Linear Regulators

LTC3025-1 数据手册

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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.  
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Wide Input Voltage Range: 0.9V to 5.5V  
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Stable with Ceramic Capacitors  
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Very Low Dropout: 85mV at 500mA  
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Adjustable Output Range: 0.4V to 3.6V (LTC3025-1)  
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Fixed Output: 1.2V(LTC3025-2), 1.5V(LTC3025-3),  
1.8V(LTC3025-4)  
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2% Voltage Accuracy over Temperature,  
Supply and Load  
Low Noise: 80μV  
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(10Hz to 100kHz)  
RMS  
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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  
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Low Power Handheld Devices  
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Low Voltage Logic Supplies  
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DSP Power Supplies  
Cellular Phones  
Portable Electronic Equipment  
Handheld Medical Instruments  
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L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
VLDO is a trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 7224204, 7218082.  
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Post Regulator for Switching Supply Noise Rejection  
TYPICAL APPLICATION  
1.2V Output Voltage from 1.5V Input Supply  
1MHz VIN Supply Rejection  
50  
V
I
= 1.2V  
≤ 500mA  
OUT  
OUT  
BIAS  
OUT  
SENSE  
GND  
45  
40  
35  
30  
25  
20  
15  
10  
5
C
= 10μF  
OUT  
0.1μF  
1μF  
Li-Ion  
OR  
3-CELL  
NiMH  
1.5V HIGH  
EFFICIENCY  
DC/DC  
LTC3025-2  
1.5V  
IN  
C
= 1μF  
OUT  
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  
30251234fc  
30251234 TA01b  
1

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