Datasheet

LTC3728L/LTC3728LX
33
3728lxff
Typical applicaTions
Figure 12. LTC3728L/LTC3728LX High Efficiency Low Noise 5V/3A, 3.3V/5A, 12V/120mA Regulator
0.1µF
0.1µF
4.7µF
+
22µF
50V
D1
MBRS1100T3
D2
Q1 Q2
Q3 Q4
1µF
10V
CMDSH-3TR
CMDSH-3TR
0.1µF
10Ω
0.01Ω
0.015Ω
3.3V
0.1µF
20k
1%
105k, 1%
33pF
15k
33pF
15k
1000pF
1000pF
1000pF
1000pF
0.1µF
20k
1%
63.4k
1%
RUN/SS1
SENSE1
+
SENSE1
–
V
OSENSE1
PLLFLTR
PLLIN
FCB
I
TH1
SGND
3.3V
OUT
I
TH2
V
OSENSE2
SENSE2
–
SENSE2
+
PGOOD
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
LTC3728L/LTC3728LX
T1, 1:1.8
10µH
L1
6.3µH
150µF, 6.3V
PANASONIC SP
1µF
25V
180µF, 4V
PANASONIC SP
GND
ON/OFF
8
5
123
V
OUT2
3.3V
5A; 6A PEAK
V
OUT3
12V
120mA
33µF
25V
V
OUT1
5V
3A; 4A PEAK
V
IN
7V TO
28V
3728 F12
+ +
V
IN
: 7V TO 28V
V
OUT
: 5V, 3A/3.3V, 6A/12V, 150mA
SWITCHING FREQUENCY = 250kHz
MI, M2: FDS6982S OR VISHAY Si4810DY
L1: SUMIDA CEP123-6R3MC
T1: 10µH 1:1.8 — DALE LPE6562-A262 GAPPED E-CORE OR BH ELECTRONICS #501-0657 GAPPED TOROID
LT1121
+
+
220k
100k
1M
PGOOD
100k
V
PULL-UP
(<7V)
59k
180pF
180pF
M1
M2