LTC3608 Datasheet, PDF (22/24 Pages) Linear Technology – 18V, 8A Monolithic Synchronous Step-Down DC/DC Converter

LTC3608
TYPICAL APPLICATIONS
PGND
5V to 18V Input to 1.8V/8A All Ceramic 1MHz
INTV_CC
C_VCC
4.7μF
6.3V
SW
R_F1
1Ω
C_F
0.1μF
25V
40 39 38 37 36 35 34 33 32 31 30 29 28 27
V_IN
EXTV_CC
C4
0.01μF
SGND
V_OUT
1.8V AT
8A
C5
22μF
6.3V
(OPTIONAL)
GND
V_IN
5V TO 18V
C_IN
10μF
25V
3×
C_OUT1 +
100μF
×2
L1
0.47μH
V_IN
41 _SW
42 _SW
43 _SW
44 _SW
45 _SW
46 _SW
47 _SW
48 _PVIN
49 _PVIN
50
PV_IN
51
PV_IN
52 _PVIN
LTC3608
SGND ²⁶
NC ²⁵
NC ²⁴
V_FB ²³
I_ON ²²
NC ²¹
SGND ²⁰
FCB ¹⁹
I_TH ¹⁸
17
V_RNG
16
PGOOD
SGND ¹⁵
1 2 3 4 5 6 7 8 9 10 11 12 13 14
C_OUT: TDKC3225XROJ107M
L1: VISHAY IHLP2525-R47
C5: TAIYO YUDEN JMK316BJ226ML-T
KEEP POWER GROUND AND SIGNAL GROUND SEPARATE.
CONNECT AT ONE POINT.
= PGND
INTV_CC
D_B
CMDSH-3
C_B1
0.22μF
C_SS
0.1μF
(OPTIONAL)
R1
R2
10k
C1
30.1k
C2
1%
1%
(OPTIONAL) ^RON
102k
V_OUT
1%
V_IN
C_ON
0.01μF
(OPTIONAL)
R5
5.76k
C_C1
1500pF
R_PG1
100k
INTV_CC
R_SS1
510k
V_IN
(OPTIONAL)
V_OUT
0.1μF
C_C2
100pF
SGND
V_OUT
3608 TA04
= SGND
Transient Response
I_L
5A/DIV
V_OUT
200mV/DIV
200mV
LOAD STEP 1A-5A
V_IN = 12V
V_OUT = 1.8V
FCB = 0V
3608 TA04a
Efficiency vs Load Current
90
DCM
80
CCM
70
60
50
40
30
100
V_IN = 12V
1000
LOAD CURRENT (mA)
10000
3608 TA04b
3608fa
22