LT3467AEDDB#TRMPBF Linear Technology, LT3467AEDDB#TRMPBF Datasheet - Page 7

• Manufacturer Part Number: LT3467AEDDB#TRMPBF
• Description: IC CONV DC/DC STEP UP 8-DFN
• Manufacturer: Linear Technology
• Type: Step-Up (Boost)r

Specifications of LT3467AEDDB#TRMPBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.26 ~ 40 V
• Current - Output: 1.1A
• Frequency - Switching: 2.1MHz
• Voltage - Input: 2.4 ~ 16 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

APPLICATIONS INFORMATION
Table 1. Inductor Manufacturers
Sumida
TDK
Murata
FDK
Soft-Start
The soft-start feature provides a way to limit the inrush
current drawn from the supply upon start-up. An internal
250k resistor charges the external soft-start capacitor
to 1.255V. After the capacitor reaches 0.15V the rate of
voltage rise at the output of the comparator A1 tracks the
rate of voltage rise of the soft-start capacitor. This limits
the inrush current drawn from the supply during start-
up. The soft-start feature plays another important role in
applications where the switch will reach levels of 30V or
higher. During start-up, excessively high switch current,
together with the presence of high voltage can overstress
the switch. A properly used soft-start feature will keep the
switch current from overshooting. This practice will greatly
improve the robustness of such designs. Once the part is
shut down, the soft-start capacitor is quickly discharged
to 0.4V, then slowly discharged through the 250k resistor
to ground. If the part is to be shut down and re-enabled in
a short period of time while soft-start is used, you must
ensure that the soft-start capacitor has enough time to
discharge before re-enabling the part. Typical values of
the soft-start capacitor range from 10nF to 200nF .
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2.6V TO 4.2V
Figure 2. Single Li-Ion Cell to 5V Boost Converter (Same as 1st Page Application)
V
IN
C1, C2: X5R OR X7R, 6.3V
D1: ON SEMICONDUCTOR MBRM120
L1: SUMIDA CR43-2R7
0.047μF
OFF ON
C1
4.7μF
www.sumida.com
www.tdk.com
www.murata.com
www.fdk.co.jp
C3
SHDN
SS
V
IN
LT3467
2.7μH
GND
L1
SW
FB
D1
0.5A/DIV
0.5A/DIV
R1
402k
R2
133k
I
I
1V/DIV
SUPPLY
1V/DIV
SUPPLY
V
V
OUT
OUT
Supply Current of Figure 2 During Start-Up
Supply Current of Figure 2 During Start-Up
C4
3.3pF
with a 47nF Soft-Start Capacitor
3467 TA05a
Without Soft-Start Capacitor
C2
15μF
V
5V
765mA AT V
540mA AT V
360mA AT V
OUT
LT3467/LT3467A
0.1ms/DIV
0.5ms/DIV
IN
IN
IN
= 4.2V,
= 3.3V,
= 2.6V
3467 AI01
3467 AI02
3467afe
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