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LTC3225EDDB-TRMPBF PDF预览

LTC3225EDDB-TRMPBF

更新时间： 2024-11-05 05:43:51
品牌 Logo 应用领域
凌特 - Linear 电容器
页数 文件大小 规格书
12页 199K
描述
150mA Supercapacitor Charger

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中文翻译

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LTC3225EDDB-TRMPBF 数据手册

 浏览型号LTC3225EDDB-TRMPBF的Datasheet PDF文件第2页浏览型号LTC3225EDDB-TRMPBF的Datasheet PDF文件第3页浏览型号LTC3225EDDB-TRMPBF的Datasheet PDF文件第4页浏览型号LTC3225EDDB-TRMPBF的Datasheet PDF文件第5页浏览型号LTC3225EDDB-TRMPBF的Datasheet PDF文件第6页浏览型号LTC3225EDDB-TRMPBF的Datasheet PDF文件第7页 
LTC3225  
150mA Supercapacitor  
Charger  
FEATURES  
DESCRIPTION  
The LTC®3225 is a programmable supercapacitor charger  
designed to charge two supercapacitors in series to a  
fixedoutputvoltage(4.8V/5.3Vselectable)froma2.8V/3V  
to 5.5V input supply. Automatic cell balancing prevents  
overvoltagedamagetoeithersupercapacitor.Nobalancing  
resistors are required.  
n
Low Noise Constant Frequency Charging of Two  
Series Supercapacitors  
n
Automatic Cell Balancing Prevents Capacitor  
Overvoltage During Charging  
n
Programmable Charging Current (Up to 150mA)  
n
Selectable 2.4V or 2.65V Regulation per Cell  
n
Automatic Recharge  
Low input noise, low quiescent current and low external  
parts count (one flying capacitor, one bypass capacitor  
n
I
I
= 20ꢀA in Standby Mode  
COUT  
No Inductors  
VIN  
n
n
n
< 1ꢀA When Input Supply is Removed  
at V and one programming resistor) make the LTC3225  
IN  
ideally suited for small battery-powered applications.  
Tiny Application Circuit (3mm × 2mm DFN Package,  
All Components <1mm High)  
Charging current level is programmed with an external  
resistor. When the input supply is removed, the LTC3225  
automaticallyentersalowcurrentstate, drawinglessthan  
1μA from the supercapacitors.  
APPLICATIONS  
n
Current Limited Applications with High Peak Power  
The LTC3225 is available in a 10-lead 3mm × 2mm DFN  
package.  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Loads (LED Flash, PCMCIA Tx Bursts, HDD Bursts,  
GPRS/GSM Transmitter)  
Backup Supplies  
n
TYPICAL APPLICATION  
Charging Profile with 30% Mismatch  
in Output Capacitance, CTOP < CBOT  
V
V
OUT  
SHDN  
IN  
V
C
C
C
IN  
+
OUT  
CX  
2.8V/3V TO 5.5V  
4.8V/5.3V  
5V/DIV  
0.6F  
0.6F  
2.2ꢀF  
1ꢀF  
I
VIN  
LTC3225  
300mA/DIV  
–
GND  
100k  
V
COUT  
SHDN PGOOD  
ON/OFF  
2V/DIV  
V
SEL  
OUTPUT  
PROGRAMMING  
PROG  
V
-V  
TOP BOT  
200mV/DIV  
12k  
3225 TA01b  
V
= V  
PROG  
5s/DIV  
SEL  
IN  
3225 TA01a  
R
= 12k  
C
C
C
C
= 1.1F  
= 1.43F  
INITIAL VOLTAGE = 0V  
INITIAL VOLTAGE = 0V  
TOP  
BOT  
TOP  
BOT  
3225f  
1
1234567...12

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