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| 型号： | LTC3625IDE-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封装： | 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WGED, DFN-12 |
| 文件页数： | 1/16页 |
| 文件大小： | 262K |
| 代理商： | LTC3625IDE-1#PBF |
LTC3625/LTC3625-1
3625f
Typical applicaTion
FeaTures
DescripTion
1A High Efficiency 2-Cell
Supercapacitor Charger
with Automatic Cell
Balancing
TheLTC3625/LTC3625-1areprogrammablesupercapaci-
tor chargers designed to charge two supercapacitors in
series to a fixed output voltage (4.8V/5.3V or 4V/4.5V
selectable) from a 2.7V to 5.5V input supply. Automatic
cell balancing prevents overvoltage damage to either
supercapacitorwhilemaximizingchargerate.Nobalancing
resistors are required.
High efficiency, high charging current, low quiescent cur-
rent and low minimum external parts count (one inductor,
onebypasscapacitoratVINandoneprogrammingresistor)
maketheLTC3625/LTC3625-1ideallysuitedforsmallform
factor backup or high peak power systems.
Charging current/maximum input current level is pro-
grammedwithanexternalresistor.Whentheinputsupplyis
removed and/or the EN pin is low, the LTC3625/LTC3625-1
automatically enter a low current state, drawing less than
1A from the supercapacitors.
The LTC3625/LTC3625-1 are available in a compact
12-lead 3mm
× 4mm × 0.75mm DFN package.
1A SCAP Charger
applicaTions
n
High Efficiency Step-Up/Step-Down Charging of Two
Series Supercapacitors
n
Automatic Cell Balancing Prevents Capacitor
Overvoltage During Charging
n
Programmable Charging Current Up to 500mA
(Single Inductor), 1A (Dual Inductor)
n
VIN = 2.7V to 5.5V
n
Selectable 2.4V/2.65V Regulation per Cell (LTC3625)
n
Selectable 2V/2.25V Regulation per Cell (LTC3625-1)
n
Low No-Load Quiescent Current: 23A
n
IVOUT, IVIN < 1A in Shutdown
n
Low Profile 12-lead 3mm
× 4mm DFN Package
n
Servers, RAID Systems, Mass Storage, High Current
Backup Supplies
n
Solid State Hard Drives
n
Wireless Power Meters
n
High Peak Power Boosted Supplies
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Charging Two 2:1 Mismatched Supercapacitors
TIME (SECONDS)
0
VOLTAGE
(V)
2
4
6
1
3
5
40
80
120
160
3625 TA01b
200
20
0
60
100
140
180
VOUT
VMID
CTOP = 50F
CBOT = 100F
RPROG = 61.9k
CTL = 0
VSEL = 0
VOUT
SW1
SW2
VMID
PGOOD
PFO
LTC3625
3.3H
CTOP ≥ 0.1F
CBOT ≥ 0.1F
VOUT
4.8V
3625 TA01a
10F
VIN
2.7V TO 5.5V
VIN
PROG
61.9k
PFI
EN
CTL
VSEL
3.3H
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