Datasheet

LTC3864
25
3864f
TYPICAL APPLICATIONS
24V to 60V Input, 24V/1A Output at 750kHz
Efficiency
3.5V to 48V Input, 1.8V/4A Output at 100kHz
Efficiency
C
SS
0.1µF
R
PGD
100k
MP
D1
L1
10µH
CAP
C
CAP
0.1µF
C
IN2
10µF
×2
C
IN1
33µF
63V
PGND
LTC3864
3864 TA03a
SS
ITH
FREQ
SGND
RUN
V
IN
MODE/PLLN
SENSE
GATE
PGOOD
V
FB
R
SENSE
15mΩ
R
ITH
14k
R
FREQ
24.3k
R
FB2
102k
100µF
×2
V
OUT
1.8V
4A
330µF
6.3V
R
FB1
80.6k
V
IN
3.5V TO 48V
C
ITH1
10nF
+
C
IN1
: SANYO 63ME33AX
D1: VISHAY V10P10
L1: WÜRTH 7447709100
MP: VISHAY/SILICONIX SI7461DP
C
VIN
0.1µF
+
C
ITH2
100pF
R
PGD2
768k
MP
D1
L1
47µH
CAP
C
CAP
0.1µF
C
IN2
2.2µF
C
IN1
33µF
63V
PGND
LTC3864
3864 TA02a
SS
ITH
C
IN1
: NICHICON UPJ1J100MPD
D1: DIODES INC SBR3U100LP
L1: TOKO 1217AS-H-470M
MP: VISHAY/SILICONIX SI7113DN
*V
OUT
FOLLOWS V
IN
WHEN 3.5V ≤ V
IN
≤ 24V
RUN
V
IN
MODE/PLLN
SENSE
GATE
PGOOD
V
FB
R
SENSE
50mΩ
R
ITH
30.1k
FREQ
SGND
R
FREQ
97.6k
R
FB2
887k
10µF
V
OUT
*
24V
1A
R
FB1
30.1k
V
IN
24V TO 60V
C
VIN
0.1µF
C
ITH1
6.8nF
C
ITH2
100pF
R
PGD1
200k
+
LOAD CURRENT (A)
0.01
30
EFFICIENCY (%)
80
70
60
50
40
90
100
0.1 1
3864 TA02b
PULSE-SKIPPING
Burst Mode
OPERATION
V
IN
= 48V
V
OUT
= 24V
LOAD CURRENT (A)
0.01
30
EFFICIENCY (%)
70
60
50
40
80
0.1 1
3864 TA03b
PULSE-SKIPPING
Burst Mode
OPERATION
V
IN
= 12V
V
OUT
= 1.8V