LTC3225EDDB#PBF Linear Technology, LTC3225EDDB#PBF Datasheet - Page 10

• Manufacturer Part Number: LTC3225EDDB#PBF
• Manufacturer: Linear Technology

Specifications of LTC3225EDDB#PBF

• Lead Free Status / Rohs Status: Compliant

LTC3225/LTC3225-1
Table 1 contains a list of ceramic capacitor manufacturers
and how to contact them.
Table 1. Capacitor Manufacturers
AVX
Kemet
Murata
Taiyo Yuden
Vishay
TDK
Layout Considerations
Due to the high switching frequency and high transient
currents produced by the LTC3225/LTC3225-1, careful
board layout is necessary for optimum performance. An
unbroken ground plane and short connections to all the
external capacitors improves performance and ensures
proper regulation under all conditions.
The voltages on the fl ying capacitor pins C
very fast rise and fall times. The high dV/dt values on
these pins can cause energy to capacitively couple to
adjacent printed circuit board traces. Magnetic fi elds can
APPLICATIONS INFORMATION
10
www.avx.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
www.component.tdk.com
Figure 3. Charging a Single Supercapacitor
+
and C
C1 = C2 ≥ 100μF
LTC3225-1
LTC3225
C
GND
OUT
C
–
X
have
10
3
8, 11
C1
C2
also be generated if the fl ying capacitors are far from the
part (i.e. the loop area is large). To prevent capacitive
energy transfer, a Faraday shield may be used. This is a
grounded PC trace between the sensitive node and the
LTC3225/LTC3225-1 pins. For a high quality AC ground it
should be returned to a solid ground plane that extends
all the way to the LTC3225/LTC3225-1.
Table 2. Supercapacitor Manufacturers
CAP-XX
NESS CAP
Maxwell
Bussmann
AVX
Illinois Capacitor
Tecate Group
Charging a Single Supercapacitor
The LTC3225/LTC3225-1 can also be used to charge a
single supercapacitor by connecting two series-connected
matched ceramic capacitors with a minimum capacitance
of 100μF in parallel with the supercapacitor as shown in
Figure 3.
3225 F03
C
SUP
V
OUT
www.cap-xx.com
www.nesscap.com
www.maxwell.com
www.cooperbussmann.com
www.avx.com
www.illcap.com
www.tecategroup.com
3225fb