Datasheet

LM2742
HG
BOOT
I
SEN
LG
PGND
FB
V
CC
SD
PWGD
FREQ
SS
SGND
EAO
PGND
+
+
+5V
V
IN
= 5 to 15V
Vo = 1.8V@1A
1 x 15 PF
25V, 3.3A
1 x 15 PF
25V, 3.1 m:
3.3 PH
4.1A, 17.4 m:
R
fb2
R
fb1
R
cs
C
ss
R
FADJ
R
IN
C
IN
D1
C
BOOT
1 PH
6.4A, 7.3 m:
R
c2
C
c3
LM2742
HG
BOOT
I
SEN
LG
PGND
FB
V
CC
SD
PWGD
FREQ
SS
SGND
EAO
PGND
+
+
+5V
V
IN
= 5 to 15V
Vo = 3.3V@1A
1 x 15 PF
25V, 3.3A
1 x 15 PF
25V, 3.1 m:
4.7 PF
3.4A, 26 m:
R
fb2
R
fb1
C
c1
R
cs
D1
C
BOOT
Q1/Q2
1 PF
6.4A, 7.3 m:
10
2.2P
0.1P
1.5k
10k
2.21k
0.1P
10
2.2P
17.4k
39n
22p
680p
10.7k
680p66.5
10k
4.99k
1.5k
17.4k
27p
1n
820p
12.1k
54.9
Co1
C
IN1
L
IN
L1
L1
L
IN
Co1
Q1/Q2
C
c2
R
c1
R
c2
C
c3
R
IN
C
c1
C
c2
R
c1
C
IN
R
FADJ
HG
BOOT
I
SEN
LG
PGND
FB
V
CC
SD
PWGD
FREQ
SS
SGND
EAO
PGND
+
+
+5V
V
IN
= 3.3V
Vo = 0.8V@5A
1 x 5600 PF
10V, 2.35A
2 x 4700 PF
16V, 2.8A
1 PH
11A, 3.7 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
10V
1 PH
4.5A, 7.5 m:
4.99k
3.3k
14.9k
147k
4.7p
680p
12n
49.9k
2.2P
10
0.1P
Co1,2
C
IN1
C
INx
L
IN
L1
LM2742
SNVS266C –MARCH 2004–REVISED MARCH 2013 www.ti.com
Figure 34. 3.3V to 0.8V, 5A, 500kHz
The circuit of Figure 34 demonstrates the LM2742 delivering a low output voltage at high efficiency (87%). A
separate 5V supply is required to run the chip, however the input voltage can be as low as 2.2
Figure 35. 1.8V and 3.3V, 1A, 1.4MHz, Simultaneous
20 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated
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