LTC3851A_15 Datasheet, PDF (25/30 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller

LTC3851A
Typical Applications
R_FREQ
82.5k
MODE/PLLIN V_IN
FREQ/PLLFLTR TG
C20
0.1µF
C_SS
0.1µF
R_C
C_C
2200pF
15k
C_C2
330pF
RUN
BOOST
LTC3851A
TK/SS
SW
I_TH
INTV_CC
V_FB
BG
SENSE^–
GND
C5
30.1k
0.047µF
SENSE⁺
I_LIM
V_IN
4.5V TO 32V
C_B
0.1µF
M1
HAT2170H
+ _CIN
22µF
L1
0.68µH
D_B
CMDSH05-4
R27
3.01k
4.7µF
M2
HAT2170H
V_OUT
3.3V
C15
47pF
R2
154k
1% ₊
15A
C_OUT
330µF
R1
×2
48.7k
1%
C_OUT: SANYO 6TPE330MIL
C_IN: SANYO 63HVH22M
L1: VISHAY IHLP5050-EZERR68MO1
3851A F11
Figure 11. High Efficiency 3.3V/15A Step-Down Converter
PLLIN
C2
350kHz
0.01µF ^R5
1k
MODE/PLLIN V_IN
FREQ/PLLFLTR TG
C1
1000pF
R_C
C_C
1000pF
7.5k
C_SS
0.1µF
C_C2
100pF
RUN
BOOST
LTC3851A
TK/SS
SW
I_TH
INTV_CC
V_FB
BG
SENSE^–
GND
1000pF
SENSE⁺
I_LIM
R22 10Ω
R20 10Ω
V_IN
6V TO 14V
+
C_B
0.1µF
M1
RJK0305DPB
C_IN
180µF
D_B
CMDSH-3
L1
0.68µH
R_SENSE
0.002Ω
4.7µF
M2
RJK0301DPB
V_OUT
1.5V
C10
33pF
R2
43.2k
1% ₊
15A
C_OUT
330µF
R1
×2
20k
1%
C_OUT: SANYO 2R5TPE330M9
L1: SUMIDA CEP125-OR6MC
3851A F12
Figure 12. 1.5V/15A Synchronized at 350kHz
3851afa
25