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LTC3121 Datasheet(PDF) 17 Page - Linear Technology

Part # LTC3121
Description  15V, 1.5A Synchronous Step-Up DC/DC Converter with Output Disconnect
PDF  26 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3121 Datasheet(HTML) 17 Page - Linear Technology

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LTC3121
17
3121fa
For more information www.linear.com/LTC3121
applicaTions inForMaTion
Figure 5. 1MHz, 5V to 12V, 400mA Boost Converter
Figure 6. Bode Plot for Example Converter
Transient Response with
200mA to 400mA Load Step
Switching Waveforms with 400mA Load
3121 F05a
VIN
SD
PWM/SYNC
RT
VCC
VOUT
CAP
FB
VC
LTC3121
SGND
PGND
RC
210k
CC
390pF
SW
L1
6.8µH
R2
113k
R1
1.02M
CF
10pF
CVCC
4.7µF
C1
100nF
COUT
22µF
VOUT
12V
400mA
RT
57.6k
VIN
5V
CIN
4.7µF
ON
OFF
PWM
BURST
FREQUENCY (kHz)
0.01
170
150
110
70
50
130
90
30
10
–10
–30
180
140
100
60
20
–20
–60
–100
–140
–180
–220
10
0.1
3121 F06
1000
1
100
GAIN
PHASE
200ns/DIV
3121 F05b
VOUT
100mV/DIV
AC-COUPLED
SW
10V/DIV
INDUCTOR
CURRENT
1A/DIV
100µs/DIV
3121 F05c
VOUT
100mV/DIV
AC-COUPLED
OUTPUT
CURRENT
200mA/DIV



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