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LTC3221_15 PDF预览

LTC3221_15

更新时间： 2024-11-14 01:13:47
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
12页 500K
描述
Micropower, Regulated Charge Pump

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LTC3221_15 数据手册

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LTC3221/  
LTC3221-3.3/LTC3221-5  
Micropower,  
Regulated Charge Pump  
in 2 × 2 DFN  
U
FEATURES  
DESCRIPTIO  
TheLTC®3221familyaremicropowerchargepumpDC/DC  
converters that produce a regulated output at up to 60mA.  
The input voltage range is 1.8V to 5.5V. Extremely low  
operating current (8µA typical at no load) and low external  
parts count (one flying capacitor and two small bypass  
■
Ultralow Power: 8µA Quiescent Current  
■
Regulated Output Voltages: 3.3V 4%, 5V 4%, ADJ  
■
V Range:  
IN  
1.8V to 4.4V (LTC3221-3.3)  
2.7V to 5.5V (LTC3221-5)  
■
Output Current: Up to 60mA  
capacitors at V and V ) make them ideally suited for  
IN  
OUT  
■
No Inductors Needed  
small, battery-powered applications.  
■
Very Low Shutdown Current: <1µA  
The LTC3221 family includes fixed 5V and 3.3V output  
versions plus an adjustable version. All parts operate  
as Burst Mode® switched capacitor voltage doublers  
to achieve ultralow quiescent current. The chips use a  
controlled current to supply the output and will survive  
■
Shutdown Disconnects Load from V  
Burst Mode Control  
Short-Circuit Protected  
Solution Profile < 1mm  
Tiny 2mm × 2mm 6-Pin DFN Package  
IN  
■
■
■
■
a continuous short-circuit from V  
to GND. The FB pin  
OUT  
of the adjustable LTC3221 can be used to program the  
U
desired output voltage.  
APPLICATIO S  
The LTC3221 family is available in a low profile (0.75mm)  
■
Low Power 2 AA Cell to 3.3V Supply  
2mm × 2mm 6-pin DFN package.  
■
Memory Backup Supplies  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst  
Mode is a registered trademark of Linear Technology Corporation. All other trademarks are  
the property of their respective owners.  
■
Tire Pressure Sensors  
General Purpose Low Power Li-Ion to 5V Supply  
RF Transmitters  
Glucose Meters  
■
■
■
U
TYPICAL APPLICATIO  
No-Load Input Current  
vs Supply Voltage  
1µF  
16  
14  
12  
2
–
1
+
C
V
C
6
5
V
V
V
OUT  
IN  
IN  
OUT  
2.2µF  
4.7µF  
LTC3221-X  
GND  
T
= 90°C  
A
4,7  
3
10  
8
T
= 25°C  
A
OFF ON  
SHDN  
3221 TA01  
T
= –45°C  
A
6
REGULATED 3.3V OUTPUT FROM 1.8V TO 4.4V INPUT  
4
V
I
I
= 3.3V 4%  
= OmA TO 25mA; V >1.8V  
= OmA TO 60mA; V >2V  
OUT  
OUT  
OUT  
IN  
IN  
2
REGULATED 5V OUTPUT FROM 2.7V TO 5.5V INPUT  
0
V
I
I
= 5V 4%  
= OmA TO 25mA; V >2.7V  
= OmA TO 60mA; V >3V  
OUT  
OUT  
OUT  
1.5  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
IN  
IN  
SUPPLY VOLTAGE (V)  
3221 TA01b  
3221f  
1
1234567...12

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