ltc3869gn-2 Linear Technology Corporation, ltc3869gn-2 Datasheet - Page 30

• Manufacturer Part Number: ltc3869gn-2
• Description: Ltc3869/ltc3869-2 - Dual, 2-phase Synchronous Step-down Dc/dc Controllers
• Manufacturer: Linear Technology Corporation

LTC3869/LTC3869-2
APPLICATIONS INFORMATION
30
V
OUT1
1.8V
15A
+
L1, L2: VISHAY IHLP4040DZ-01, 0.56µH
M1, M3: RENESAS RJK0305DPB
M2, M4: RENESAS RJK0330DPB
0.56µH
C
330µF
×2
OUT1
L1
3.09k
40.2k
1%
1%
20k
1%
M1
M2
Figure 13. High Efficiency Dual 400kHz 1.8V/1.2V Step-Down Converter
4.7µF
12.1k
1%
1nF
0.1µF
0.1µF
Figure 14. DCR Sense Efficiency vs R
150pF
2.2Ω
90
85
80
75
70
95
D3
0.1µF
0
DCR SENSE APP: SEE FIGURE 16
R
V
MODE = CCM
SENSE
TG1
BOOST1
SW1
BG1
MODE/PLLIN
I
SENSE1
SENSE1
RUN2
RUN1
V
I
IN
V
LIM
TH1
TK/SS1
IN
FB1
= 12V
2
PGOOD
APP: SEE FIGURE 19
+
–
4
LTC3869
1µF
LOAD CURRENT (A)
SGND
EFFICIENCY
EXTV
6
CC
8
SENSE2
SENSE2
BOOST2
TK/SS2
INTV
PGND
FREQ
SW2
V
TG2
BG2
I
10
TH2
FB2
1.8V R
1.8V DCR SENSE
1.2V R
1.2V DCR SENSE
CC
POWER LOSS
+
–
0.1µF
12
SENSE
SENSE
SENSE
D4
14
3869 F14
100k
1%
16
Efficiency
5
4
3
2
1
0
0.1µF
0.1µF
4.99k
1%
1nF
M3
M4
150pF
20k
1%
10µF
25V
×2
3.09k
1%
+
20k
1%
0.56µH
L2
3869 F13
82µF
25V
+
V
4.5V TO
20V
IN
C
330µF
×2
V
1.2V
15A
OUT2
OUT2
3869f