LTC3226
TYPICAL APPLICATION
Li-Ion Backup Supply
TO LOAD
MPEXT
GATE
V
IN
+
C1
R1
2.21M
Li-Ion
4.7ꢀF
V
OUT
5V
R3
47ꢀF
CPO
PFI
255k
R4
R2
1.21M
C
3.83M
SC
VMID
R4
80.6k
1.2F
470k
R6
1.21M
LTC3226
470k
+
CPO_FB
C
C
470k
FLY
LDO_FB
RST_FB
2.2ꢀF
–
C
RST
PFO
CAPGOOD
H/L
EN_CHG
PROG
ꢀP
R
PROG
C
: CAP-XX HS230
3226 TA02
SC
GND
33.2k
MPEXT: VISHAY Si2333
RELATED PARTS
PART
NUMBER
DESCRIPTION
COMMENTS
LTC3225/
LTC3225-1
150mA Supercapacitor Charger
Low Noise, Constant Frequency Charging of Two Series Supercapacitors. Automatic
Cell Balancing Prevents Capacitor Overvoltage During Charging. Programmable Charge
Current (Up to 150mA). Selectable 2.4V or 2.65V Regulation per Cell (LTC3225),
Selectable 2V or 2.25V Regulation per Cell (LTC3225-1). 2mm × 3mm DFN Package
LT3485
Photoflash Capacitor Chargers with Output
Voltage Monitor and Integrated IGBT Drive
Integrated IGBT Driver; Voltage Output Monitor; Uses Small Transformers: 5.8mm
× 5.8mm × 3mm. Operates from Two AA Batteries, Single Cell Li-Ion or Any Supply
from 1.8V Up to 10V. No Output Voltage Divider Needed; No External Schottky Diode
Required. Charges Any Size Photoflash Capacitor; 10-Lead (3mm × 3mm) DFN Package
LTC3625/
LTC3625-1
1A High Efficiency 2-Cell Supercapacitor
Charger with Automatic Cell Balancing
High Efficiency Step-Up/Step-Down Charging of Two Series Supercapacitors. Automatic
Cell Balancing Prevents Capacitor Overvoltage During Charging. Programmable
Charging Current Up to 500mA (Single Inductor), 1A (Dual Inductor). V = 2.7V
IN
to 5.5V, Selectable 2.4V/2.65V Regulation per Cell (LTC3625). Selectable 2V/2.25V
Regulation per Cell (LTC3625-1), Low No-Load Quiescent Current: 23ꢀA.
12-lead 3mm × 4mm DFN Package
LT3750
LT3751
Capacitor Charger Controller
Charges Any Size Capacitor; Easily Adjustable Output Voltage. Drives High Current
NMOS FETs; Primary-Side Sense—No Output Voltage Divider Necessary. Wide Input
Range: 3V to 24V; Drives Gate to V – 2V. 10-Lead MS Package
CC
High Voltage Capacitor Charger Controller with Charges Any Size Capacitor; Low Noise Output in Voltage Regulation Mode. Stable
Regulation
Operation Under a No-Load Condition; Integrated 2A MOSFET Gate Driver with
Rail-to-Rail Operation for V ≤ 8V. Selectable 5.6V or 10.5V Internal Gate Drive Voltage
CC
Clamp; User-Selectable Over/Undervoltage Detect. Easily Adjustable Output Voltage;
Primary or Secondary Side Output Voltage Sense. Wide Input V Voltage Range
CC
(5V to 24V). 20-Pin QFN 4mm × 5mm and 20-Lead TSSOP Packages
LTC4425
Supercapacitor Charger with Current Limited
Ideal Diode
Constant-Current/Constant-Voltage Linear Charger for 2-cell Series Supercapacitor
Stack. V : Li-Ion/Polymer Battery, a USB Port, or a 2.7V to 5.5V Current-Limited
IN
Supply. 2A Charge Current, Auto Cell Balancing, 20ꢀA Quiescent Current, Shutdown
Current <2ꢀA. Low Profile 12-Pin 3mm × 3mm DFN or a 12-Lead MSOP Package
3226fa
LT 0512 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
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© LINEAR TECHNOLOGY CORPORATION 2011
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
Linear Systems [ Linear Systems ]
