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LTC1434IGN Scheda tecnica(PDF) 14 Page - Linear Technology

Il numero della parte LTC1434IGN
Spiegazioni elettronici  450mA, Low Noise Current Mode Step-Down DC/DC Converters
PDF  20 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LTC1434IGN Scheda tecnica(HTML) 14 Page - Linear Technology

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LTC1433/LTC1434
APPLICATIONS INFORMATION
CIN will require an RMS current rating of at least 0.2A at
temperature and COUT will require an ESR of less than
0.25
Ω. 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.
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 VOUT to VIN. This
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.
Figure 14. Design Example Circuit and its Efficiency Curve
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SSW
NC
BSW
NC
SGND
RUN/SS
LBO
LBI
PWRVIN
SVIN
COSC
POR
ITH
VOSENSE
VPROG
LTC1433
PGND
100
µF*
10V
0.1
µF
0.1
µF
100
µF*
10V
D1: MBRS130LT3
L1: SUMIDA CD54-220
*AVX TPSD107M010R0100
VOUT
5V
400mA
D1
L1
22
µH
POWER-ON
RESET
VIN
6V
680pF
5.1k
10k
6800pF
50pF
LOAD CURRENT (A)
0.001
60
70
80
0.01
0.1
1
1433/34 F14
50
40
100
90
VIN = 6V
VOUT = 5V
COSC = 50pF
L = 22
µH
+
LTC1434
+
D1
D2
COUT
SW
VOUT
VIN
L
1433/34 F15
Figure 15



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