LTC3608
26
3608fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
l
FAX: (408) 434-0507
l
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2008
LT 0610 REV C • PRINTED IN USA
typical application
14V to 18V Input to 12V/5A at 500kHz
PART NUMBER DESCRIPTION COMMENTS
LTC1778 No R
SENSE
Current Mode Synchronous Step-Down Controller Up to 97% Efficiency, V
IN
: 4V to 36V, 0.8V ≤ V
OUT
≤ (0.9)(V
IN
), I
OUT
Up
to 20A
LTC3414 4A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC Converter 95% Efficiency, V
IN
: 2.25V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 64µA, I
SD
:
<1µA, TSSOP20E Package
LTC3418 8A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC Converter 95% Efficiency, V
IN
: 2.25V to 5.5V, V
OUT(MIN)
= 0.8V, Thermally
Enhanced 38-Lead QFN Package
LTC3610 12A Current Mode Monolithic Synchronous Step-Down
Converter
Up to 24V Input (28V Maximum). Current Mode Extremely Fast
Transient Response
LTM4600HV 10A Complete Switch Mode Power Supply 92% Efficiency, V
IN
: 4.5V to 28V, V
OUT
: 0.6V, True Current Mode
Control, Ultrafast Transient Response
LTM4601HV 12A Complete Switch Mode Power Supply 92% Efficiency, V
IN
: 4.5V to 28V, V
OUT
: 0.6V, True Current Mode
Control, Ultrafast Transient Response
LTM4603HV 6A Complete Switch Mode Power Supply 93% Efficiency, V
IN
: 4.5V to 28V, with PLL, Output Tracking and
Margining with Ultrafast Transient Response
relateD parts
Transient Response
Efficiency Curve
EXTV
CC
C4
0.01µF
C
IN
: TAIYO YUDEN TMK432BJ106MM
C
OUT
: SANYO 16SVP180MX
L1: CDEP85NP-4R3MC-88
KEEP POWER GROUND AND SIGNAL GROUND SEPARATE.
CONNECT AT ONE POINT.
3608 TA05
V
OUT
12V AT
5A
GND
C
OUT1
180µF
16V
C5
22µF
25V
L1
4.3µH
GND
V
IN
V
IN
14V TO 18V
C
IN
10µF
25V
3×
C6
10µF
35V
+
(OPTIONAL)
+
(OPTIONAL)
INTV
CC
C
B1
0.22µF
V
IN
C
SS
0.1µF
R
SS1
510k
PGND
SGND
(OPTIONAL)
SW
INTV
CC
C
VCC
4.7µF, 6.3V
V
IN2
C
F
0.1µF
25V
R5
24.9k
C
C1
3300pF
C
ON
0.01µF
V
IN
(OPTIONAL)
R
ON
1M
1%
V
OUT
C2C1
(OPTIONAL)
R1
3.16k
1%
R2
60.4k
1%
(OPTIONAL)
INTV
CC
INTV
CC
R
PG1
100k
90.9k
C
C2
100pF
LTC3608
SGND
26
NC
25
NC
24
V
FB
23
I
ON
22
NC
21
SGND
20
FCB
19
I
TH
18
V
RNG
17
PGOOD
16
SGND
15
PV
IN
1
PV
IN
2
PV
IN
3
PV
IN
4
PV
IN
5
PV
IN
6
PV
IN
7
SW
8
NC
9
SGND
10
BOOST
11
RUN/SS
12
V
ON
13
SGND
14
PGND
40
PGND
39
PGND
38
PGND
37
PGND
36
PGND
35
PGND
34
SW
33
INTV
CC
32
INTV
CC
31
SV
IN
30
EXTV
CC
29
NC
28
SGND
27
SW
41
SW
42
SW
43
SW
44
SW
45
SW
46
SW
47
PV
IN
48
PV
IN
49
PV
IN
50
PV
IN
51
PV
IN
52
SGND
INTV
CC
D
B
CMDSH-3
C
VON
(OPTIONAL)
R
F1
1Ω
RUN/SS
10k
= SGND
= PGND
LOAD STEP 1A-8A
V
IN
= 18V
V
OUT
= 12V
FCB = 0V
3608 TA05a
20µs/DIV
V
OUT
200mV/DIV
I
L
5A/DIV
LOAD CURRENT (A)
100
50
EFFICIENCY (%)
55
65
75
60
70
80
85
90
95
100
1000 1000
3608 TA05b
10000
V
IN
= 18V
FREQ = 500kHz
CCM
DCM
