ltc3528-2 Linear Technology Corporation, ltc3528-2 Datasheet - Page 13

• Manufacturer Part Number: ltc3528-2
• Description: Ltc3528-2 - 1a, 2mhz Synchronous Step-up Dc/dc Converter In 2mm ? 3mm Dfn
• Manufacturer: Linear Technology Corporation

APPLICATIONS INFORMATION
Table 1. Recommended Inductors
VENDOR
Coilcraft
[phone]
www.coilcraft.com
Coiltronics
Sumida
[phone]
www.sumida.com
TDK
Toko
[phone]
www.tokoam.com
Wurth
[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
extremely low ESR and are available in small footprints.
A 10µF to 22µF output capacitor is sufficient for most ap-
plications. Values larger than 22µF 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.
TYPICAL APPLICATIONS
0.88V TO 1.6V
V
IN
OFF ON
4.7µF
2.2µH
1 Cell to 1.8V
V
PGOOD
SHDN
IN
LTC3528-2
GND
SW
V
PART/STYLE
DO1606T, MSS5131, MSS5121
MSS6122, MOS6020
ME3220, DO1608C
1812PS
SD12, SD14, SD20
SD25, SD52
CD43
CDC5D23B
CDRH5D18
VLP , VLF
VLCF , SLF , VLS
D53, D62, D63
D73, D75
WE-TPC type M, MH
OUT
FB
499k
1M
68pF
35282 TA02a
10µF
V
1.8V
250mA
OUT
The internal loop compensation of the LTC3528-2 is de-
signed to be stable with output capacitor values of 10µF
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 improving the
transient response is to add a small feed-forward capaci-
tor across the top resistor of the feedback divider (from
V
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 10µF input capacitor is sufficient
for most applications. 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.
Table 2. Capacitor Vendor Information
SUPPLIER
AVX
Murata
Taiyo-Yuden
TDK
OUT
to FB). A typical value of 68pF will generally suffice.
100
70
60
40
30
90
80
50
0.01
PHONE
[phone]
[phone]
[phone]
[phone]
0.1
LOAD CURRENT (mA)
Efficiency
1
10
WEBSITE
www.avxcorp.com
www.murata.com
www.t-yuden.com
www.component.tdk.com
LTC3528-2
V
V
V
100
IN
IN
IN
35282 TA02b
= 0.9V
= 1.2V
= 1.5V
1000
13
35282fa