LTC3527/LTC3527-1
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Table 1. Recommended Inductors
VENDOR PART/STYLE
L
(μH)
MAXIMUM
CURRENT
(mA)
DCR
(Ω)
DIMENSIONS
L × W × H
(mm)
Coilcraft
www.coilcraft.com
MSS5131
MSS4020
ME3220
2.2-10
3.3-10
1-10
1900-870
1100-540
3000-780
0.023-0.083
0.085-0.210
0.05-0.90
5.1 × 5.1 × 1
4 × 4 × 2
3.2 × 2.5 × 2
Coiltronics
www.cooperet.com
SD10
SD12
1-10
1.2-10
1930-760
2450-818
0.045-0.289
0.037-0.284
5.2 × 5.2 × 1
5.2 × 5.2 × 1.2
FDK
www.fdk.com
MIP3226D
MIPF2520D
1.5-6.8
1.5-4.7
1400-1000
1500-1000
0.07-0.12
0.07-0.11
3.2 × 2.6 × 1
2.5 × 2 × 1
Murata
www.murata.com
LQH43C
LQH32C
1-10
1-4.7
1080-650
800-650
0.08-0.24
0.09-0.15
4.5 × 3.2 × 2.6
3.2 × 2.5 × 2
Sumida
www.sumida.com
CDRH3D16
CDRH2D14
4.7-15
4.7-12
900-450
680-420
0.11-0.29
0.12-0.32
3.8 × 3.8 × 1.8
3.2 × 3.2 × 1.5
TDK
www.global.tdk.co.jp
VLF3010A
VLF5012A
1.5-10
2.2-10
1200-490
1500-800
0.068-0.58
0.090-0.30
2.6 × 2.8 × 1
4.5 × 4.7 × 1.2
Taiyo Yuden
www.t-yuden.com
NR3010
NR3015
4.7-15
4.7-15
750-400
1000-560
0.19-0.74
0.12-0.36
3 × 3 × 1
3 × 3 × 1.5
Table 2. Capacitor Vendor Information
SUPPLIER PHONE WEBSITE
AVX (803) 448-9411 www.avxcorp.com
Murata (714) 852-2001 www.murata.com
Taiyo-Yuden (408) 573-4150 www.t-yuden.com
TDK (847) 803-6100 www.component.tdk.com
APPLICATIONS INFORMATION
Output and Input Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used to minimize output voltage ripple. Multilayer
ceramic capacitors are an excellent choice as they have
extremely low ESR and are available in small footprints.
A 4.7μF to 10μF output capacitor is suffi cient for most
applications. Larger values up to 22μF may be used to
obtain lower 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 LTC3527/
LTC3527-1 is designed to be stable with output capacitor
values of 4.7μF or greater. 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 which
have large load transients. Another method of improv-
ing the transient response is to add a small feedforward
capacitor across the top resistor of the feedback divider
[from V
OUT1
(V
OUT2
) to FB1 (FB2)]. A typical value of 15pF
will generally suffi ce.
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 suffi cient for most
applications, although larger values may be used without
limitations. Table 2 shows a list of several ceramic capaci-
tor manufacturers. Consult the manufacturers directly for
detailed information on their selection of ceramic parts.
