Datasheet

LTC4449
11
4449fa
FB1 COMP1 VSNSOUT VSNSN VSNSP COMP2 FB2
V
DIFF1
V
OS1N
V
OS1P
V
CC
V
CC
I
LIM1
ISNS1P
ISNS1N ISNS2N
ISNS2P
I
LIM2
RUN2
TRACK/SS2
FREQ
CLKIN
CLKOUT
PHSMD
PGOOD2
PWM2
V
CC
TRACK/SS1
VINSNS
I
AVG
PGOOD1
PWM1
RUN1
LTC3860
220pF
1.33k
V
DIFF1
V
CC
V
CC
5V
20k 20k
1µF
0.22µF 0.22µF
V
IN
7V TO 14V
470µF
100pF
0.22µF
SW1
0.3µH
12.7k
33pF
1.5nF
FREQ SET FOR 600kHz
45k
7V TO 14V IN AND 1.2V OUT AT 50A f
SW
= 600kHz, DCR SENSING
PWM2
SS1
CLKOUT
RUN2
0.1µF
TRACK/SS1
100k
50k
2.2
1µF
4.7µF
V
CC
PWM1
RUN1
IN V
LOGIC
V
CC
BOOST
4 3 2 1
5 6 7 8
4 3 2 1
5 6 7 8
GND
BG
TS
TG
LTC4449
HAT2167H s2
V
IN
HAT2160H s2
22µF s2
47µF s3
330µF s3
47
V
OUT1
1.2V 50A
V
OS1P
V
OS1N
47
2.74k 2.74k
0.22µF
SW2
SW2
0.3µH
2.2
1µF
4.7µF
V
CC
IN V
LOGIC
V
CC
BOOST
GND
BG
TS
TG
LTC4449
HAT2167H s2
V
IN
HAT2160H s2
22µF s2
47µF s3
330µF s3
4449 TA02
SW1
2-Phase 1.2V/50A Step-Down Converter
TYPICAL APPLICATION