LTC1433CGN Linear Technology, LTC1433CGN Datasheet - Page 14

• Manufacturer Part Number: LTC1433CGN
• Description: IC DC/DC CONV STEP-DOWN 16-SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1433CGN

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 5V, Adj
• Current - Output: 450mA
• Frequency - Switching: 125kHz ~ 240kHz
• Voltage - Input: 3 ~ 13.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

LTC1433/LTC1434
APPLICATIONS
C
temperature and C
0.25 . In most of the applications, the requirements for
these capacitors are fairly similar.
Figure 14 shows the complete circuit along with its effi-
ciency curve.
14
IN
400mA
V
OUT
will require an RMS current rating of at least 0.2A at
5V
+
100 F*
10V
22 H
D1: MBRS130LT3
L1: SUMIDA CD54-220
* AVX TPSD107M010R0100
L1
OUT
U
will require an ESR of less than
INFORMATION
0.1 F
D1
U
1
2
3
4
5
6
7
8
Figure 14. Design Example Circuit and its Efficiency Curve
SSW
NC
BSW
NC
SGND
RUN/SS
LBO
LBI
W
LTC1433
V
PWRV
OSENSE
0.1 F
V
PGND
C
PROG
SV
POR
OSC
I
TH
IN
IN
LTC1434
U
16
15
14
13
12
11
10
9
100 F*
10V
V
IN
Figure 15
10k
5.1k
SW
V
6V
POWER-ON
RESET
D1
IN
Latchup Prevention (Figure 15)
In applications where the input supply can momentarily
dip below the output voltage, it is recommended that a
Schottky diode (D2) be connected from V
diode will prevent the output capacitor from forward
biasing the parasitic diode of the internal monolithic power
MOSFET, preventing a large amount of current from
flowing into the substrate to create a potential latchup
condition.
D2
680pF
6800pF
L
+
50pF
1433/34 F15
C
V
OUT
OUT
100
80
70
60
50
40
90
0.001
V
V
C
L = 22 H
IN
OUT
OSC
= 6V
= 5V
= 50pF
0.01
LOAD CURRENT (A)
OUT
0.1
to V
1433/34 F14
IN
. This
1