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LTC3226_12

更新时间： 2024-11-05 11:45:59
品牌 Logo 应用领域
Linear Systems 电容器
页数 文件大小 规格书
16页 226K
描述
2-Cell Supercapacitor Charger with Backup

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LTC3226_12 数据手册

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LTC3226  
2-Cell Supercapacitor  
Charger with Backup  
PowerPath Controller  
FEATURES  
DESCRIPTION  
TheLTC®3226isa2-cellseriessupercapacitorchargerwith  
a backup PowerPath controller. It includes a charge pump  
supercapacitorchargerwithprogrammableoutputvoltage,  
a low dropout regulator, and a power-fail comparator for  
switching between normal and backup modes.  
n
1x/2x Multimode Charge Pump Supercapacitor  
Charger  
n
Automatic Cell Balancing  
n
Ideal Diode Main PowerPath™ Controller  
(V to V  
)
IN  
OUT  
n
n
n
n
n
n
n
Internal 2A LDO Backup Supply (CPO to V  
Automatic Main/Backup Switchover  
Input Voltage Range: 2.5V to 5.5V  
Programmable SCAP Charge Voltage  
)
OUT  
The constant input current supercapacitor charger is  
designed to charge two supercapacitors in series to a  
resistor-programmable output voltage of 2.5V to 5.3V.  
The charger input current limit is programmable by an  
external resistor at up to 315mA.  
Programmable Input Current Limit (315mA Max)  
No Load I = 55μA (Typical)  
VIN  
The internal backup LDO is powered from the superca-  
pacitors and provides up to 2A peak output current with  
an adjustable output voltage. When the input supply falls  
belowthepower-failthreshold, theLTC3226automatically  
enters a backup state in which the supercapacitors power  
the output through the LDO. The input supply power-fail  
voltagelevelisprogrammedbyanexternalresistordivider.  
Low Profile, 16-Lead 3mm × 3mm QFN Package  
APPLICATIONS  
n
Smart Power Meters  
n
Battery-Powered Industrial/Medical Equipment  
n
3.3V Solid-State Drives  
n
Industrial Alarms  
n
Data Backup Supplies  
Low input noise, low quiescent current and a compact  
footprintmaketheLTC3226ideallysuitedforsmall,battery-  
powered applications. Internal current limit and thermal  
shutdown circuitry allow the device to survive a continu-  
ous short-circuit from the PROG or CPO pins to ground.  
n
Battery Hold-Up Supplies  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners.  
TYPICAL APPLICATION  
3.3V Backup Supply  
MPEXT  
TO LOAD  
(2A)  
Automatic Normal-to-Backup  
Mode Switchover  
LTC3226  
LDO  
V
IN  
3.3V  
GATE  
V
6
IN  
C
C
= 1.2F  
SC  
V
2.2ꢀF  
OUT  
CPO  
= 47ꢀF  
= 2A  
OUT  
LOAD  
5
4
I
C
OUT  
47ꢀF  
255k  
1.96M  
LDO_FB  
RST_FB  
CPO  
V
OUT  
80.6k  
3
1.2V  
PFI  
+
–
5V  
V
IN  
2
+
V
IN  
BACKUP  
MODE  
1.21M  
33.2k  
C
VMID  
C
SC  
1.2F  
BACKUP MODE  
(LDO IN  
1
–
2.2ꢀF  
(LDO IN  
C
DROPOUT)  
CHARGE  
PUMP  
REGULATION)  
PROG  
0
3.83M  
PFO (2V/DIV)  
CPO_FB  
EN_CHG  
–1  
0
0.4  
0.8  
1.2  
1.6  
2.0  
PFO  
RST  
1.21M  
TIME (SECONDS)  
CAPGOOD  
3226 TA01b  
GND  
3226 TA01a  
3226fa  
1
1234567...16

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