LTC3609 Datasheet, PDF (21/24 Pages) Linear Technology – 32V, 6A Monolithic Synchronous Step-Down DC/DC Converter

LTC3609
TYPICAL APPLICATIONS
5V to 32V Input to 1.2V/6A at 550kHz
INTV_CC
C_VCC
4.7μF
6.3V
V_IN
C_F
R_F1
0.1μF 1Ω
25V
SW
GND
40 39 38 37 36 35 34 33 32 31 30 29 28 27
V_OUT
1.2V AT
6A
GND
C_OUT1
100μF
x2
L1
0.8μH
V_IN
V_IN
5V TO 32V
C_IN
4.7μF
50V
x2
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
LTC3609
SGND ²⁶
NC ²⁵
NC ²⁴
V_FB ²³
I_ON ²²
21
NC
SGND ²⁰
19
FCB
I_TH ¹⁸
V_RNG ¹⁷
PGOOD ¹⁶
15
SGND
EXTV_CC
C4
0.01μF
R2
60.4k
1%
R1
60.4k
1%
R_ON
182k
1%
V_OUT
V_IN
INTV_CC
JP1
R5
C_C1
1500pF
8.45k
R3
0Ω
R_PG1
100k
C_C2
100pF
1 2 3 4 5 6 7 8 9 10 11 12 13 14
C5: TAIYO YUDEN JMK316BJ226ML-T
C_IN: MURATA GRM32ER71H475K
C_OUT: MURATA GRM435R60J167M
L_I: CDEP850R8MC-88
KEEP POWER GROUND AND SIGNAL
GROUND SEPARATE. CONNECT AT
ONE POINT.
SW
2Ω
INTV_CC
D_B
CMDSH-3
C_B1
0.22μF
SW
C_SS
0.1μF
C_VON
0.1μF
PGOOD
SGND
INTV_CC
V_OUT
3609 TA03
I_L
5A/DIV
Transient Response
V_OUT
200mV/DIV
20μs/DIV
LOAD STEP 1A TO 6A
V_IN = 12V
V_OUT = 1.2V
FCB = 0V
3609 TA02b
Efficiency vs Load Current
90 _{VIN = 12V}
85 ^{FREQUENCY = 550kHz}
80
75
70
65
60
55
50
0.01
0.1
1
LOAD CURRENT (A)
10
3609 TA02c
3609f
21