Datasheet

LM2742
HG
BOOT
LG
PGND
FB
SD
PWGD
FREQ
SS
SGND
EAO
PGND
+
+
+5V
V
IN
= 12V
Vo = 3.3V@10A
2 x 10 PF
25V, 3.3A
4 x 100 PF
10V, 55 m:
2.7 PH
14.4A, 4.5 m:
R
fb2
R
fb1
C
c1
C
c2
R
c1
R
CS
C
SS
R
FADJ
R
IN
C
IN
D1
C
BOOT
Q1
Q2
1 PF,
25V
1.2 PH
8.2A, 6.9 m:
R
c2
C
c3
0.1P
1.8k
10
2.2P
88.7k
12n
270p
6.8p
143.3k
8.45k 470p
11k
49.9k
C
IN
1,2
C
INX
Co1-4
L
IN
L1
V
CC
I
SEN
12
87.5%
22 1.7 
O
IN
est 'd
I D
I

K
 
INrms rip O
I I D 1 D

 
2
rms rip
Cin
I ESR
P
n


LM2742
SNVS266C –MARCH 2004–REVISED MARCH 2013 www.ti.com
(19)
(20)
4.28
2
*0.018/2 = 0.164W
Input Inductor Loss
P
Lin
= I
2
in
* DCR
input-L
(21)
(22)
2.82
2
*0.007 = 0.055W
Output Inductor Loss
P
Lout
= I
2
o
* DCR
output-L
(23)
10
2
*0.004 = 0.4W
System Efficiency
(24)
Example Circuits
Figure 31. 5V-16V to 3.3V, 10A, 300kHz
This circuit and the one featured on the front page have been designed to deliver high current and high efficiency
in a small package, both in area and in height The tallest component in this circuit is the inductor L1, which is
6mm tall. The compensation has been designed to tolerate input voltages from 5 to 16V.
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