LT3433IFE#TR Linear Technology, LT3433IFE#TR Datasheet - Page 13

• Manufacturer Part Number: LT3433IFE#TR
• Description: IC CONV DC/DC 200KHZ SW 16-TSSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost)r

Specifications of LT3433IFE#TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3 ~ 20 V
• Current - Output: 500mA
• Frequency - Switching: 200kHz
• Voltage - Input: 4 ~ 60 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

APPLICATIO S I FOR ATIO
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.
TYPICAL APPLICATIO S
(SWITCHED)
4V TO 60V
V
V
SHDN
BATT
BATT
20k
R4
C4
2.2 F
100V
4V-60V to 5V Converter with Switched Burst Enable and Shutdown
R3
100k
B160A
U
D
DZ1
20V
S1
1nF
C2
1N4148
C3 330pF
U
100k
1%
R2
68k
1 F
10V
R1
C5
D2
309k
U
1%
R5
COEV DU1352-101M
W
V
SW_H
V
BURST_EN
V
V
BST
IN
C
FB
LT3433
100 H
SGND
L1
PWRGND
SW_L
SHDN
V
V
BIAS
OUT
SS
U
0.1 F 10V
C1
0.01 F
1N4148
B120A
D
C6
S2
D1
3433 TA03a
MODE SWITCH:
V
V
+
IN
IN
0.1V/DIV
H-L: 7.9V
L-H: 8.3V
5V/DIV
C7
47 F
10V
V
4V-50V to 5V Converter Input Transient Response
OUT
V
IN
V
5V
4V < V
8.5V < V
OUT
IN
1ms 13.8V to 4V Input Transition
IN
< 8.5V: 125mA
< 60V: 350mA
1ms/DIV
90
80
70
60
50
40
30
20
0.1
V
IN
= 13.8V
BURST
(BURST)
V
1
OUTPUT CURRENT (mA)
IN
= 4V
Efficiency
10
3433 AI04
V
LT3433
IN
= 13.8V
100
V
13
IN
= 4V
3433 TA03b
3433f
1000