LTC3865-1_15 Datasheet, PDF (34/38 Pages) Linear Technology – Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

LTC3865/LTC3865-1
TYPICAL APPLICATIONS
10μF
35V
2.2Ω
1μF
RJK0305DPB
L1
0.47μH
4.7μF
D3
0.1μF
RJK0330DPB
2mΩ
100Ω
100Ω
0.1μF
+
6800pF
C_{OUT1 1.21k}
220μF _1%
100pF
V_IN PGOOD EXTV_CC INTV_CC
TG1
TG2
BOOST1
SW1
BG1
LTC3865
BOOST2
SW2
BG2
MODE/PLLIN
PGND
I_LIM
SENSE1⁺
FREQ
SENSE2⁺
RUN1
SENSE1^–
VID11
VID12
V_OSENSE1
I_TH1
TK/SS1
SGND
RUN2
SENSE2^–
VID21
VID22
V_OSENSE2
I_TH2
TK/SS2
0.1μF
V_IN
10μF
35V
+
22μF
50V
7V TO 20V
D4
0.1μF
RJK0330DPB
RJK0305DPB
L2
0.47μH
100Ω
0.1μF
100Ω
2mΩ
1.2V
30A
+ _COUT2
162k
220μF
C_OUT1, C_OUT2: SANYO 4TPE 220μF
L1, L2: VISHAY IHLP4040DZERR47M11
0Ω
RUN1
RUN2
3865 F17a
Figure 17. High Current, Single Output, 1.2V/30A Converter Using Sense Resistors
Efficiency vs Load Current
100
V_IN = 12V
90
Burst Mode
80
OPERATION
70
60
50
40
PULSE-SKIPPING
30
MODE
20
FORCED CONTINUOUS
MODE
10
0
0
1
10
LOAD CURRENT (A)
100
3865 F17b
Load Step (Forced Continuous Mode)
V_OUT
200mV/DIV
AC-COUPLED
I_L
5A/DIV
I_LOAD
0A TO 20A/DIV
V_IN = 12V
V_OUT = 1.2V
40μs/DIV
3865 F17c
3865fb
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