LTC3866 Datasheet, PDF (31/36 Pages) Linear Technology – Current Mode Synchronous Controller for Sub Milliohm DCR Sensing

Typical Applications
LTC3866
I_L
10A/DIV
0A
V_OUT
100mV/DIV
AC-COUPLED
V_IN = 12V
V_OUT = 1.5V
50µs/DIV
3866 F16
Figure 16. Load Step Transient Response
V_OUT
TYPICAL
FRONT PAGE
10mV/DIV
AC-COUPLED
V_OUT
LOW RIPPLE
FIGURE 15
10mV/DIV
AC-COUPLED
V_IN = 12V
V_OUT = 1.5V
2µs/DIV
3866 F17
Figure 17. Very Low Output Voltage Ripple
100
90
V_IN = 12V
V_OUT = 1.5V
80
70
60
50
40
30
20
10
0
0.01
0.1
1
10
LOAD CURRENT (A)
100
3866 F18
Figure 18. Power Efficiency vs Load Current
20k
0.1µF
28.7k
R2
147k
100pF
2.2nF
R3
20k
5V/25A Step-Down Converter
C1
220nF
FREQ MODE/PLLIN
RUN
PGOOD
TK/SS
ITEMP
ITH
EXTV_CC
V_FB LTC3866 V_IN
DIFFOUT INTVCC
DIFFP
BOOST
DIFFN
TG
SNSD⁺
SW
SNS^–
BG
SNSA⁺
PGND
ILIM
CLKOUT
SGND
120k
V_OUT
1µF
4.7µF
2.2Ω
V_IN
10µF
180µF ^12V
×2
×2
CMDSH-3
BSC024NE2LS
BSC010NE2LS
L1
1µH
DCR = 1.3mΩ
R1
3.48k
100µF
×2
330µF
×2
V_OUT
5V
25A
3866 TA04
3866fa
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