LTC3225EDDB-1#TRMPBF

LTC3225/LTC3225-1
10
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Table 1 contains a list of ceramic capacitor manufacturers
and how to contact them.
Table 1. Capacitor Manufacturers
AVX www.avx.com
Kemet www.kemet.com
Murata www.murata.com
Taiyo Yuden www.t-yuden.com
Vishay www.vishay.com
TDK www.component.tdk.com
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
+
and C
have
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
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 www.cap-xx.com
NESS CAP www.nesscap.com
Maxwell www.maxwell.com
Bussmann www.cooperbussmann.com
AVX www.avx.com
Illinois Capacitor www.illcap.com
Tecate Group www.tecategroup.com
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.
APPLICATIONS INFORMATION
Figure 3. Charging a Single Supercapacitor
C1
C
SUP
V
OUT
C1 = C2 ≥ 100µF
C2
10
3
8, 11
3225 F03
LTC3225
LTC3225-1
C
OUT
C
X
GND
LTC3225/LTC3225-1
11
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TYPICAL APPLICATION
5V Supercapacitor Back-Up Supply
R2
10k
LTC3225
LTC3225-1
PROG
V
IN
V
IN
5V
C
OUT
C
+
C
X
C1
F
C2
10F
C5
22µF
C6
100µF
C7
100µF
C3
10F
C4
2.2µF
C
V
SEL
R1
12k
R2
470k
GND
SHDN
V
IN
GND
CTL
SENSE
GATE
STAT
LTC4412
V
IN1
V
IN2
GND I
THM1
V
OUT1
FB1
I
THM2
V
OUT2
FB2
LTM4616
1.8V
1.2V
GND
Q1
Si4421DY
Q2
Si4421DY
R3
4.78k
C8
100µF
3225 TA02
LTC3225/LTC3225-1
12
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PACKAGE DESCRIPTION
DDB Package
10-Lead Plastic DFN (3mm × 2mm)
(Reference LTC DWG # 05-08-1722 Rev Ø)
2.00 p0.10
(2 SIDES)
NOTE:
1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE OUTLINE M0-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
0.40 p 0.10
BOTTOM VIEW—EXPOSED PAD
0.64 p 0.05
(2 SIDES)
0.75 p0.05
R = 0.115
TYP
R = 0.05
TYP
2.39 p0.05
(2 SIDES)
3.00 p0.10
(2 SIDES)
15
106
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
0.200 REF
0 – 0.05
(DDB10) DFN 0905 REV Ø
0.25 p 0.05
2.39 p0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.64 p0.05
(2 SIDES)
1.15 p0.05
0.70 p0.05
2.55 p0.05
PACKAGE
OUTLINE
0.25 p 0.05
0.50 BSC
PIN 1
R = 0.20 OR
0.25 s 45o
CHAMFER
0.50 BSC

LTC3225EDDB-1#TRMPBF

Mfr. #:
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management Specialized - PMIC 150mA Supercapacitor Charger
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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