LTC3226
16
3226fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
LT 0512 REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
Li-Ion Backup Supply
V
OUT
GATE
MPEXT
V
IN
PFI
C
+
C
FLY
2.2µF
R1
2.21M
R2
1.21M
C
–
PROG
EN_CHGH/L
RST
PFO
CAPGOOD
GND
LTC3226
CPO
VMID
C1
4.7µF
Li-Ion
47µF
TO LOAD
5V
R
PROG
33.2k
R4
3.83MC
SC
1.2F
R6
1.21M
R3
255k
R4
80.6k
470k
C
SC
: CAP-XX HS230
MPEXT: VISHAY Si2333
470k
470k
3226 TA02
CPO_FB
LDO_FB
RST_FB
+
µP
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
IN
= 2.7V
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: 23µA.
12-lead 3mm × 4mm DFN Package
LT3750 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
CC
– 2V. 10-Lead MS Package
LT3751 High Voltage Capacitor Charger Controller with
Regulation
Charges Any Size Capacitor; Low Noise Output in Voltage Regulation Mode. Stable
Operation Under a No-Load Condition; Integrated 2A MOSFET Gate Driver with
Rail-to-Rail Operation for V
CC
≤ 8V. Selectable 5.6V or 10.5V Internal Gate Drive Voltage
Clamp; User-Selectable Over/Undervoltage Detect. Easily Adjustable Output Voltage;
Primary or Secondary Side Output Voltage Sense. Wide Input V
CC
Voltage Range
(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
IN
: Li-Ion/Polymer Battery, a USB Port, or a 2.7V to 5.5V Current-Limited
Supply. 2A Charge Current, Auto Cell Balancing, 20µA Quiescent Current, Shutdown
Current <2µA. Low Profile 12-Pin 3mm × 3mm DFN or a 12-Lead MSOP Package
