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LT3433 Datasheet(PDF) 13 Page - Linear Technology

Part # LT3433
Description  High Voltage Step-Up/Step-Down DC/DC Converter
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3433 Datasheet(HTML) 13 Page - Linear Technology

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13
LT3433
3433f
Input Voltage Transient Suppression
Not only does a LT3433 converter operate across a large
range of DC input voltages, it also maintains tight output
regulation during significant input voltage transients. The
LT3433 automatic transitioning between buck and buck/
boost modes of operation provides seamless output regu-
lation over these input voltage transients. In an automotive
environment, input voltage transients are commonplace,
such as those experienced during a cold crank condition.
During the initiation of cold crank, the battery rail can be
pulled down to 4V in as little as 1ms. In a 4V-60V to 5V DC/
DC converter application (shown on the first page of this
data sheet) a cold crank transient condition, simulated
with a 1ms 13.8V to 4V input transition, yields regulation
maintained to 1% with a 125mA load.
APPLICATIO S I FOR ATIO
4V-50V to 5V Converter Input Transient Response
1ms 13.8V to 4V Input Transition
VIN
5V/DIV
VOUT
0.1V/DIV
1ms/DIV
3433 AI04
TYPICAL APPLICATIO S
VBST
SW_H
VIN
BURST_EN
VC
VFB
SW_L
PWRGND
VOUT
VBIAS
SHDN
SS
SGND
LT3433
D2
1N4148
C5
1
µF
10V
C3 330pF
R5
309k
1%
R2
100k
1%
R3
100k
DZ1
20V
R1
68k
R4
20k
C2
1nF
VBATT
4V TO 60V
SHDN
VBATT
(SWITCHED)
3433 TA03a
C6
0.1
µF 10V
C1
0.01
µF
D1
1N4148
L1
100
µH
COEV DU1352-101M
DS2
B120A
C4
2.2
µF
100V
DS1
B160A
C7
47
µF
10V
MODE SWITCH:
VIN H-L: 7.9V
VIN L-H: 8.3V
VOUT
5V
4V < VIN < 8.5V: 125mA
8.5V < VIN < 60V: 350mA
+
4V-60V to 5V Converter with Switched Burst Enable and Shutdown
OUTPUT CURRENT (mA)
40
60
80
90
0.1
10
100
1000
3433 TA03b
20
1
70
50
30
VIN = 4V
VIN = 13.8V
VIN = 13.8V
BURST
VIN = 4V
(BURST)
Efficiency



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