Datasheet

LTC3226
14
3226f
Charging a Single Supercapacitor
The LTC3226 can also be used to charge a single super-
capacitor by connecting two series-connected matched
ceramic capacitors with a minimum capacitance of 100µF
in parallel with the supercapacitor as shown in Figure 3.
Supercapacitor Manufacturers
Refer to the following table for supercapacitor manu-
facturers.
Table 1. Supercapacitor Manufacturers
CAP-XX www.cap-xx.com
NESS CAP www.nesscap.com
Maxwell www.maxwell.com
Bussmann www.cooperbussmann.com
AVX www.avx.com
Illinois Capacitor www.illinoiscapacitor.com
Tecate Group www.tecategroup.com
APPLICATIONS INFORMATION
Figure 3. Charging a Single Supercapacitor
Board Layout Considerations
Due to high switching frequency and high transient cur-
rents produced by the LTC3226 charge pump, careful
board layout is necessary for optimum performance. A true
ground plane and short connections to all of the external
capacitors will improve performance.
Also, to be able to deliver maximum load current from
the LDO under all conditions, it is critical that the exposed
metal pad on the backside of the QFN package has a good
thermal contact to the PC board ground plane. Lack of
proper thermal contact can cause the junction temperature
to exceed the threshold for thermal shutdown.
C1
C2
C
SUP
3226 F03
CPO
LTC3226
VMID
GND