LTC3535EDD#PBF Linear Technology, LTC3535EDD#PBF Datasheet - Page 13

• Manufacturer Part Number: LTC3535EDD#PBF
• Description: IC DC/DC CONV 550MA DL 12-DFN
• Manufacturer: Linear Technology
• Type: Step-Up (Boost)r

Specifications of LTC3535EDD#PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 1.5 ~ 5.25 V
• Current - Output: 550mA
• Frequency - Switching: 1MHz
• Voltage - Input: 0.5 ~ 5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 12-DFN
• Primary Input Voltage: 6V
• No. Of Outputs: 2
• Output Voltage: 5.25V
• Output Current: 550mA
• No. Of Pins: 12
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

APPLICATIONS INFORMATION
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 LTC3535 is designed
to be stable with output capacitor 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.
TYPICAL APPLICATION
TO 1.5V
2.2µF
0.8V
V
IN
2.2µF
499k
1.5M
4.7µH
4.7µH
Single Cell to 3.3V Converter with 20 Seconds of Holdup with 30mA Load
V
SHDN1
V
SHDN2
IN1
IN2
GND
LTC3535
SW2
SW
V
V
GND
OUT1
OUT2
FB1
FB2
10µF
1.78M
1M
+
*POWERSTOR PA-5R0H474-R
OUT
C
0.47F
HOLD
V
HOLDUP
V
3.3V
30mA
OUT
*
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
1M
392k
4.25V
3535 TA02
PHONE
[phone]
[phone]
[phone]
[phone]
[phone]
V
HOLDUP
1V/DIV
2V/DIV
2V/DIV
V
OUT
V
IN
WEBSITE
www.avxcorp.com
www.murata.com
www.t-yuden.com
www.component.tdk.com
www.sem.samsung.com
5s/DIV
LTC3535
13
3535 TA02b
3535fa