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LTC3539EDCB-2-PBF Datasheet(PDF) 10 Page - Linear Technology

Part # LTC3539EDCB-2-PBF
Description  2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3539EDCB-2-PBF Datasheet(HTML) 10 Page - Linear Technology

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LTC3539/LTC3539-2
10
3539f
APPLICATIONS INFORMATION
Table 1. Representative Inductors
VENDOR
PART/STYLE
Coilcraft
(847) 639-6400
www.coilcraft.com
MSS5131
LPS4018-222
MSS6132
MOS6020
Murata
www.murata.com
LQH55D
LQH66S
Sumida
(847) 956-0666
www.sumida.com
CDRH4D22
CDRH4D28C
CDRH5D28
CDR6D23
TDK
(847) 803-6100
www.component.tdk.com
VLF5014ST
Toko
(408) 432-8282
www.tokoam.com
D53LC
D63LCB
Wurth
(201) 785-8800
www.we-online.com
WE-TPC Type LH, X
WE-PD Type XS
Output and Input Capacitor Selection
The internal loop compensation of the LTC3539 is designed
to be stable with output capacitor values of 10μF or greater.
Although ceramic capacitors are recommended, low ESR
(equivalent series resistance) tantalum capacitors may be
used as well.
Low ESR 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 22μF to 47μF output
capacitor is sufficient for output voltages of 3V or greater.
An output capacitor of up to 100μF is required at lower
output voltages. Even with VOUT greater than 3V, larger
values up to 100μF 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.
A small ceramic capacitor in parallel with a larger tantalum
capacitor may be used in demanding applications which
have large load transients. A feedforward capacitor across
the top resistor of the feedback divider (from VOUT to FB)
is usually required to improve transient response. 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. Larger values may be used without limita-
tions. Table 2 shows a list of several ceramic capacitor
manufacturers. Consult the manufacturers directly for
detailed information on their selection of ceramic parts.
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
TYPICAL APPLICATIONS
1 Cell to 1.8V
1 Cell to 3.3V
Li-Ion Cell to 5V
3539 TA02
LTC3539
VIN
SW
2.2μF
VOUT
1.8V
500mA
VIN
1V TO 1.6V
2.2μH
VOUT
MODE
SHDN
FB
PGND
GND
1.91M
1M
22μF*
x5
*AT HIGH LOAD CURRENTS, A
TANTALUM CAPACITOR WILL
IMPROVE PERFORMANCE.
22pF
BURST
PWM
ON
OFF
3539 TA03
LTC3539
VIN
SW
2.2μF
VOUT
3.3V
350mA
VIN
0.9V TO 1.6V
2.2μH
VOUT
MODE
SHDN
FB
PGND
GND
562k
1M
22μF
x2
BURST
PWM
ON
OFF
22pF
3539 TA04
LTC3539-2
VIN
SW
2.2μF
VOUT
5V
750mA
VIN
3V TO 4.5V
2.2μH
VOUT
MODE
SHDN
FB
PGND
GND
309k
1M
22μF
BURST
PWM
ON
OFF
22pF


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