ltc3526lb-2 Linear Technology Corporation, ltc3526lb-2 Datasheet - Page 11

• Manufacturer Part Number: ltc3526lb-2
• Description: Ltc3526l-2/ltc3526lb-2 - 550ma 2mhz Synchronous Step-up Dc/dc Converters In 2mm ? 2mm Dfn
• Manufacturer: Linear Technology Corporation

applicaTions inForMaTion
inductor current without saturating. Molded chokes and
some chip inductors usually do not have enough core
area to support the peak inductor current of 750mA seen
on the LTC3526L-2/LTC3526LB-2. To minimize radiated
noise, use a shielded inductor. See Table 1 for suggested
components and suppliers.
Table 1. Recommended Inductors
VENDOR
Coilcraft
[phone]
www.coilcraft.com
Coiltronics
www.cooperet.com
FDK
[phone]
www.fdk.com
Murata
[phone]
www.murata.com
Sumida
[phone]
www.sumida.com
Taiyo-Yuden
www.t-yuden.com
TDK
[phone]
www.component.tdk.com
Toko
[phone]
www.tokoam.com
Würth
[phone]
www.we-online.com
Output and Input Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used to minimize the output voltage ripple. Multilayer
ceramic capacitors are an excellent choice as they have
PART/STYLE
LPO4815
LPS4012,
LPS3314
MSS4020
ME3220
SD10, SD12, SD3114, SD3118
MIP3226D
MIPF2520D
MIPWT3226D
MIPSZ2012D
MIPS2520D
LQH3NP
LQH32P
LQM2MPN
CDRH2D14
CDRH2D11
CDRH3D11
NR3010T
NR3015T
NR3012T
VLP
VLF , VLCF
D412C
WE-TPC type S, M, TH, XS
extremely low ESR and are available in small footprints. A
4.7µF to 10µF output capacitor is sufficient for most ap-
plications. Larger values may be used to obtain extremely
low output voltage ripple and improve transient response.
X5R and X7R dielectric materials are preferred for their
ability to maintain capacitance over wide voltage and
temperature ranges. Y5V types should not be used.
The internal loop compensation of the LTC3526L-2/
LTC3526LB-2 are designed to be stable with output ca-
pacitor values of 4.7µF or greater (without the need for
any external series resistor). Although ceramic capacitors
are recommended, low ESR tantalum capacitors may be
used as well.
A small ceramic capacitor in parallel with a larger tantalum
capacitor may be used in demanding applications that have
large load transients. Another method of improving the
transient response is to add a small feed-forward capacitor
across the top resistor of the feedback divider (from V
to FB). A typical value of 22pF will generally suffice.
Low ESR input capacitors reduce input switching noise
and reduce the peak current drawn from the battery. It
follows that ceramic capacitors are also a good choice
for input decoupling and should be located as close as
possible to the device. A 2.2µF input capacitor is sufficient
for most applications, although larger values may be
used without limitations. Table 2 shows a list of several
ceramic capacitor manufacturers. Consult the manufactur-
ers directly for detailed information on their selection of
ceramic capacitors.
Table 2. Capacitor Vendor Information
SUPPLIER
AVX
Murata
Taiyo-Yuden
TDK
Samsung
LTC3526L-2/LTC3526LB-2
PHONE
[phone]
[phone]
[phone]
[phone]
[phone]
WEBSITE
www.avxcorp.com
www.murata.com
www.t-yuden.com
www.component.tdk.com
www.sem.samsung.com

3526lb2fa
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