ltc3608ewkg Linear Technology Corporation, ltc3608ewkg Datasheet - Page 24

• Manufacturer Part Number: ltc3608ewkg
• Description: 18v, 8a Monolithic Synchronous Step-down Dc/dc Converter
• Manufacturer: Linear Technology Corporation

LTC3608
TYPICAL APPLICATION
RELATED PARTS
PART NUMBER
LTC1778
LTC3414
LTC3418
LTC3610
LTM4600HV
LTM4601HV
LTM4603HV
24
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
C
C
L1: CDEP85NP-4R3MC-88
KEEP POWER GROUND AND SIGNAL GROUND SEPARATE.
CONNECT AT ONE POINT.
IN
OUT
: TAIYO YUDEN TMK432BJ106MM
= PGND
= SGND
12V AT
: SANYO 16SVP180MX
V
GND
200mV/DIV
OUT
DESCRIPTION
No R
4A (I
8A (I
12A Current Mode Monolithic Synchronous Step-Down
Converter
10A Complete Switch Mode Power Supply
12A Complete Switch Mode Power Supply
6A Complete Switch Mode Power Supply
5A
(OPTIONAL)
14V TO 18V
5A/DIV
V
OUT
OUT
OUT
SENSE
22μF
10μF
25V
25V
I
C
L
C5
3×
IN
V
LOAD STEP 1A-8A
V
V
FCB = 0V
), 4MHz, Synchronous Step-Down DC/DC Converter
), 4MHz, Synchronous Step-Down DC/DC Converter
IN
IN
OUT
●
= 18V
Current Mode Synchronous Step-Down Controller
FAX: [phone]
= 12V
(OPTIONAL)
Transient Response
C
180μF
OUT1
10μF
16V
35V
C6
+
+
200mV
GND
4.3μH
L1
V
IN
PGND
●
41
42
43
44
45
46
47
48
49
50
51
52
www.linear.com
3608 TA05a
SW
SW
SW
SW
SW
SW
SW
PV
PV
PV
PV
PV
IN
IN
IN
IN
IN
14V to 18V Input to 12V/5A at 500kHz
40 39 38 37 36 35 34 33 32 31 30 29 28 27
1
2
3
INTV
4
4.7μF , 6.3V
CC
5
C
CMDSH-3
VCC
6
D
B
LTC3608
7
8
SW
INTV
9 10 11 12 13 14
C
0.22μF
B1
CC
COMMENTS
Up to 97% Effi ciency, V
to 20A
95% Effi ciency, V
<1μA, TSSOP20E Package
95% Effi ciency, V
Enhanced 38-Lead QFN Package
Up to 24V Input (28V Maximum). Current Mode Extremely Fast
Transient Response
92% Effi ciency, V
Control, Ultrafast Transient Response
92% Effi ciency, V
Control, Ultrafast Transient Response
93% Effi ciency, V
Margining with Ultrafast Transient Response
C
0.1μF
C
0.1μF
25V
100
SS
F
95
90
85
80
75
70
65
60
55
50
PGOOD
100
SGND
SGND
SGND
V
FCB
RNG
R
1Ω
V
I
I
NC
NC
NC
ON
TH
F1
FB
DCM
RUN/SS
IN
IN
IN
IN
IN
26
25
24
23
22
21
20
19
18
17
16
15
: 2.25V to 5.5V, V
: 2.25V to 5.5V, V
: 4.5V to 28V, V
: 4.5V to 28V, V
: 4.5V to 28V, with PLL, Output Tracking and
Effi ciency Curve
V
1000
IN2
LOAD CURRENT (A)
IN
(OPTIONAL)
: 4V to 36V, 0.8V ≤ V
SGND
R1
3.16k
1%
10k
CCM
R
510k
SS1
C4
0.01μF
90.9k
R
100k
© LINEAR TECHNOLOGY CORPORATION 2008
PG1
1000
V
FREQ = 500kHz
EXTV
OUT
OUT
IN
(OPTIONAL)
V
OUT(MIN)
OUT(MIN)
IN
= 18V
C1
C
0.01μF
: 0.6V, True Current Mode
: 0.6V, True Current Mode
CC
ON
INTV
INTV
3608 TA05b
10000
CC
CC
(OPTIONAL)
LT 0808 REV A • PRINTED IN USA
(OPTIONAL)
= 0.8V, I
= 0.8V, Thermally
R
1M
1%
OUT
ON
24.9k
R5
≤ (0.9)(V
R2
60.4k
1%
Q
= 64μA, I
3300pF
100pF
C
C
C
C1
C2
VON
(OPTIONAL)
IN
3608 TA05
C2
), I
OUT
V
V
INTV
SGND
SD
OUT
IN
3608fa
:
CC
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