LTC3608 Datasheet, PDF (24/24 Pages) Linear Technology – 18V, 8A Monolithic Synchronous Step-Down DC/DC Converter

LTC3608
TYPICAL APPLICATION
PGND
14V to 18V Input to 12V/5A at 500kHz
C_VCC
4.7μF, 6.3V
INTV_CC
SW
C_F RF1
0.1μF 1Ω
25V
40 39 38 37 36 35 34 33 32 31 30 29 28 27
V_IN2
EXTV_CC
C4
0.01μF
SGND
V_OUT
12V AT
5A
C5
22μF
25V
(OPTIONAL)
GND
C_OUT1 +
180μF
16V
L1
4.3μH
V_IN
14V TO 18V
V_IN
GND
C_IN
C6 +
10μF
10μF
25V
35V
3×
(OPTIONAL)
41 _SW
42 _SW
43 _SW
44 _SW
45 _SW
46 _SW
47 _SW
48
PV_IN
49 _PVIN
50 _PVIN
51 _PVIN
52 _PVIN
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
C_IN: TAIYO YUDEN TMK432BJ106MM
C_OUT: SANYO 16SVP180MX
L1: CDEP85NP-4R3MC-88
KEEP POWER GROUND AND SIGNAL GROUND SEPARATE.
CONNECT AT ONE POINT.
= PGND
= SGND
1 2 3 4 5 6 7 8 9 10 11 12 13 14
INTV_CC
D_B
CMDSH-3
C_B1
0.22μF
C_SS
0.1μF
RUN/SS
R1
3.16k
1%
R2
C1
60.4k
1%
(OPTIONAL) ^RON
1M
1%
C_ON
0.01μF
(OPTIONAL)
(OPTIONAL)
C2
V_OUT
V_IN
R5
24.9k
C_C1
3300pF
90.9k
10k
INTV_CC
R_PG1
100k
INTV_CC
C_C2
100pF
SGND
R_SS1
510k
V_IN
(OPTIONAL)
(OPTIONAL)
C_VON
INTV_CC
3608 TA05
Transient Response
Efficiency Curve
100
95
DCM
90
I_L
5A/DIV
85
CCM
80
75
V_OUT
200mV/DIV
70
65
200mV
LOAD STEP 1A-8A
V_IN = 18V
V_OUT = 12V
FCB = 0V
3608 TA05a
60
55
50
100
V_IN = 18V
FREQ = 500kHz
1000
1000
LOAD CURRENT (A)
10000
3608 TA05b
RELATED PARTS
PART NUMBER DESCRIPTION
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No R_SENSE Current Mode Synchronous Step-Down Controller
LTC3414
4A (I_OUT), 4MHz, Synchronous Step-Down DC/DC Converter
LTC3418
8A (I_OUT), 4MHz, Synchronous Step-Down DC/DC Converter
LTC3610
LTM4600HV
12A Current Mode Monolithic Synchronous Step-Down
Converter
10A Complete Switch Mode Power Supply
LTM4601HV 12A Complete Switch Mode Power Supply
LTM4603HV 6A Complete Switch Mode Power Supply
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
COMMENTS
Up to 97% Efficiency, V_IN: 4V to 36V, 0.8V ≤ V_OUT ≤ (0.9)(V_IN), I_OUT Up
to 20A
95% Efficiency, V_IN: 2.25V to 5.5V, V_OUT(MIN) = 0.8V, I_Q = 64μA, I_SD:
<1μA, TSSOP20E Package
95% Efficiency, V_IN: 2.25V to 5.5V, V_OUT(MIN) = 0.8V, Thermally
Enhanced 38-Lead QFN Package
Up to 24V Input (28V Maximum). Current Mode Extremely Fast
Transient Response
92% Efficiency, V_IN: 4.5V to 28V, V_OUT: 0.6V, True Current Mode
Control, Ultrafast Transient Response
92% Efficiency, V_IN: 4.5V to 28V, V_OUT: 0.6V, True Current Mode
Control, Ultrafast Transient Response
93% Efficiency, V_IN: 4.5V to 28V, with PLL, Output Tracking and
Margining with Ultrafast Transient Response
3608fa
LT 0808 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2008