LTC3226_12 Datasheet, PDF (16/16 Pages) Linear Technology – 2-Cell Supercapacitor Charger

LTC3226
TYPICAL APPLICATION
Li-Ion Backup Supply
+
Li-Ion
MPEXT
TO LOAD
C1
4.7μF
V_IN
R1
2.21M
PFI
R2
1.21M
GATE
V_OUT
5V
CPO
VMID
LTC3226
R4
C_SC
3.83M
1.2F
R6
1.21M
C⁺
C_FLY
2.2μF
C^–
CPO_FB
LDO_FB
RST_FB
H/L
EN_CHG
RST
PFO
PROG
R_PROG
33.2k
CAPGOOD
GND
C_SC: CAP-XX HS230
MPEXT: VISHAY Si2333
R3
255k
47μF
R4
80.6k
470k
470k
470k
μP
3226 TA02
RELATED PARTS
PART
NUMBER
DESCRIPTION
LTC3225/
LTC3225-1
150mA Supercapacitor Charger
LT3485
Photoflash Capacitor Chargers with Output
Voltage Monitor and Integrated IGBT Drive
LTC3625/
LTC3625-1
1A High Efficiency 2-Cell Supercapacitor
Charger with Automatic Cell Balancing
LT3750
LT3751
Capacitor Charger Controller
High Voltage Capacitor Charger Controller with
Regulation
LTC4425
Supercapacitor Charger with Current Limited
Ideal Diode
COMMENTS
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
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
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
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
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
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
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3226fa
LT 0512 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2011