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LTC3443 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC3443
Description  High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3443 Datasheet(HTML) 10 Page - Linear Technology

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LTC3443
10
sn3443 3443fs
A detailed diagram of this function is shown in Figure 5.
The components RSS and CSS provide a slow ramping
voltage on the SHDN/SS pin to provide a soft-start
function.
SOFT-START
The soft-start function is combined with shutdown. When
the SHDN/SS pin is brought above typically 1V, the IC is
enabled but the EA duty cycle is clamped from the VC pin.
OPERATIO
9
PVIN
A
4
SW1
6
GND
5
SW2
L
+–
8
VOUT
D
C
800mA
0mA
3443 F03
T1
B
dI
dt
VIN
L
≈
9
PVIN
A
4
SW1
6
GND
5
SW2
L
–+
8
VOUT
D
C
800mA
0mA
3443 F04
T2
B
dI
dt
VOUT
L
≈ –
–
+
12
11
VIN
ERROR AMP
1.22V
14µA
FB
R1
R2
CP1
VC
VOUT
1
SHDN/SS
CSS
1V
ENABLE SIGNAL
RSS
SOFT-START
CLAMP
TO PWM
COMPARATORS
CHIP
ENABLE
3443 F05
–
+
VCI
Figure 3. Inductor Charge Cycle During Burst Mode Operation
Figure 4. Inductor Discharge Cycle During Burst Mode Operation
Figure 5. Soft-Start Circuitry



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