Datasheet

LM27402
Q
T2
Q
L2
L
out
R
s
C
s
C
b
C
o1
R
fb1
R
fb2
C
c2
C
c1
R
c1
R
f
C
ss
D
dd
C
dd
VOUT
C
c3
R
c2
VIN
HG
LG
GND
SW
CS+
CS-
VDD
CBOOT
FB
COMP
EN
SS/TRACK
SYNC
PGOOD
FADJ
R
pg
C
sy
C
in
R
in
PGD
EN
SYNC
SS/TK
R
s2
R
s1
C
o2
C
o3
C
o4
C
o5
+
GND OUT
R
s3
R
s5
R
tc
R
s4
Q
T1
Q
L1
100 PF
100 PF
100 PF100 PF
OPEN
750:
0.68 PH
OPEN
OPEN
5.6 k:
OPEN
4110ppm
6.34 k:
1.3 k:
220 nF
OPEN
OPEN
SiR436DP
Si7192DP
20.0 k:
261:
13.3 k:
820 pF
8.01 k:
3.9 nF
150 pF
1 nF
C
sb
R
sb
1.00:
220 nF
1 PF
2.2:
100 pF
D
sw
51.1 k:
1 PF
45.3 k:
47 nF
R
en2
R
en1
OPEN
OPEN
VIN
C
in1
C
in2
C
in3
22 PF
22 PF22 PF
C
in4
22 PF
C
in5
+
+
C
in6
C
in7
22 PF
OPEN
OPEN
VIN
GND IN
R
l
R
h
optional
Tx
Rx
R
50
49.9:
V
IN
LM27402
C
IN
Q
H
Q
L
L
R
S
C
S
C
BOOT
C
OUT
R
FB1
R
FB2
C
C2
C
C1
R
C1
R
FADJ
C
SS
D
BOOT
C
VDD
V
OUT
C
C3
R
C2
VIN
HG
LG
GND
SW
CS+
CS-
VDD
CBOOT
FB
COMP
EN
SS/TRACK
SYNC
PGOOD
FADJ
R
SET
R
PGOOD
C
SBY
C
F
R
F
Evaluation Board Schematic www.ti.com
Figure 1. Simplified Application Schematic
4 Evaluation Board Schematic
Figure 2. V
IN
= 4.5V to 20V, V
OUT
= 1.5V, I
OUT
= 20A
2
AN-1992 LM27402 Evaluation Board SNVA406B–May 2010–Revised May 2013
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