LTC3608 LINER [Linear Technology], LTC3608 Datasheet - Page 21

• Manufacturer Part Number: LTC3608
• Description: 18V, 8A Monolithic Synchronous Step-Down DC/DC Converter
• Manufacturer: LINER [Linear Technology]

TYPICAL APPLICATIONS
1.2V AT
V
GND
OUT
8A
(OPTIONAL)
5V TO 18V
C5: TAIYO YUDEN JMK316BJ226ML-T
C
C
L1: CDEP85NP-R50MC-125
KEEP POWER GROUND AND SIGNAL GROUND SEPARATE.
CONNECT AT ONE POINT.
IN
OUT1
22μF
10μF
6.3V
200mV/DIV
25V
C
: TAIYO YUDEN TMK432BJ106MM
C5
3×
= PGND
= SGND
IN
V
: TDKC4532X5R107M
5A/DIV
IN
V
OUT
I
(OPTIONAL)
L
LOAD STEP 1A-8A
V
V
FCB = 0V
C
100μF
IN
OUT
10μF
OUT1
35V
= 12V
×2
C6
= 1.2V
+
+
Transient Response
GND
0.5μH
L1
200mV
V
IN
PGND
41
42
43
44
45
46
47
48
49
50
51
52
SW
SW
SW
SW
SW
SW
SW
PV
PV
PV
PV
PV
IN
IN
IN
IN
IN
40 39 38 37 36 35 34 33 32 31 30 29 28 27
1
3608 TA03a
2
3
INTV
5V to 18V Input to 1.2V/8A at 550kHz
4
CC
5
4.7μF
C
6.3V
VCC
CMDSH-3
6
D
B
LTC3608
7
8
SW
INTV
9 10 11 12 13 14
C
0.22μF
B1
CC
C
0.1μF
C
0.47μF
25V
SS
F
PGOOD
SGND
SGND
SGND
V
R
1Ω
FCB
RNG
V
I
I
NC
NC
NC
F1
ON
TH
FB
(OPTIONAL)
90
85
80
75
70
65
60
55
50
26
25
24
23
22
21
20
19
18
17
16
15
R
510k
100
SS1
V
FREQ = 550kHz
V
IN
IN2
Effi ciency vs Load Current
= 12V
SGND
R1
30k
1%
V
DCM
IN
1000
LOAD CURRENT (A)
C4
0.01μF
R
100k
PG1
V
EXTV
OUT
(OPTIONAL)
C1
C
0.01μF
0.1μF
CC
ON
OCM
INTV
1000
R
CC
(OPTIONAL)
(OPTIONAL)
VON
187k
R
1%
ON
3608 TA03b
7.68k
R5
LTC3608
10000
R2
30.1k
1%
1500pF
100pF
C
C
C
C1
C2
VON
(OPTIONAL)
3608 TA03
C2
21
V
V
SGND
V
3608fa
OUT
IN
OUT