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LTC3225_15

更新时间： 2024-09-26 01:23:07
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
14页 274K
描述
150mA Supercapacitor Charger

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中文翻译

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LTC3225_15 数据手册

 浏览型号LTC3225_15的Datasheet PDF文件第2页浏览型号LTC3225_15的Datasheet PDF文件第3页浏览型号LTC3225_15的Datasheet PDF文件第4页浏览型号LTC3225_15的Datasheet PDF文件第5页浏览型号LTC3225_15的Datasheet PDF文件第6页浏览型号LTC3225_15的Datasheet PDF文件第7页 
LTC3225/LTC3225-1  
150mA Supercapacitor  
Charger  
FEATURES  
DESCRIPTION  
TheLTC®3225/LTC3225-1areprogrammablesupercapaci-  
tor chargers designed to charge two supercapacitors in  
series to a selectable fixed output voltage (4.8V/5.3V for  
the LTC3225 and 4V/4.5V for the LTC3225-1) from input  
supplies as low as 2.8V to 5.5V. Automatic cell balancing  
prevents overvoltage damage to either supercapacitor. No  
balancing resistors are required.  
n
Low Noise Constant Frequency Charging of Two  
Series Supercapacitors  
n
Automatic Cell Balancing Prevents Capacitor  
Overvoltage During Charging  
n
Programmable Charge Current (Up to 150mA)  
n
Selectable 2.4V or 2.65V Regulation per Cell  
(LTC3225)  
n
Selectable 2V or 2.25V Regulation per Cell  
Low input noise, low quiescent current and low external  
parts count (one flying capacitor, one bypass capacitor at  
(LTC3225-1)  
Automatic Recharge  
n
V
and one programming resistor) make the LTC3225/  
IN  
n
I
I
= 20ꢀA in Standby Mode  
COUT  
No Inductors  
VIN  
LTC3225-1 ideally suited for small battery-powered  
n
n
n
< 1ꢀA When Input Supply is Removed  
applications.  
Charge current level is programmed with an external  
resistor. When the input supply is removed, the LTC3225/  
LTC3225-1automaticallyenteralowcurrentstate,drawing  
less than 1μA from the supercapacitors.  
Tiny Application Circuit (2mm × 3mm DFN Package,  
All Components <1mm High)  
APPLICATIONS  
The LTC3225/LTC3225-1 are available in a 10-lead 2mm  
× 3mm DFN package.  
L, LT, LTC and LTM are registered trademarks and ThinSOT is a trademark of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
n
Current Limited Applications with High Peak Power  
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
OUT  
V
IN  
SHDN  
V
C
C
C
4.8V/5.3V (LTC3225)  
4V/4.5V (LTC3225-1)  
IN  
+
OUT  
2.8V/3V TO 5.5V  
5V/DIV  
0.6F  
0.6F  
2.2ꢀF  
1ꢀF  
CX  
LTC3225  
LTC3225-1  
I
VIN  
300mA/DIV  
–
GND  
100k  
V
COUT  
SHDN PGOOD  
ON/OFF  
2V/DIV  
V
OUTPUT  
PROGRAMMING  
SEL  
PROG  
12k  
3225 TA01a  
V
-V  
TOP BOT  
200mV/DIV  
3225 TA01b  
LTC3225  
= V  
5 SEC/DIV  
V
R
SEL  
IN  
= 12k  
PROG  
C
C
C
C
= 1.1F  
= 1.43F  
TOP  
BOT  
TOP  
BOT  
INITIAL VOLTAGE = 0V  
INITIAL VOLTAGE = 0V  
3225fb  
1
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