LTC3728 Datasheet, PDF (29/32 Pages) Linear Technology – Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator

TYPICAL APPLICATIO S
LTC3728
59k
1M
0.1µF
180pF
20k
1%
105k, 1%
1000pF
33pF
15k _1000pF
33pF
3.3V
15k _1000pF
20k
1%
180pF
63.4k
1%
1000pF
1
RUN/SS1
28
PGOOD
2 _SENSE1+
27
TG1
3 _SENSE1–
26
SW1
4
V_OSENSE1
5
PLLFLTR
25
BOOST1
24
V_IN
6
PLLIN
23
BG1
7
FCB
8
I_TH1
22
EXTV_CC
LTC3728
21
INTV_CC
9
SGND
20
PGND
10
3.3V_OUT
11
I_TH2
12
V_OSENSE2
13 _SENSE2–
19
BG2
18
BOOST2
17
SW2
16
TG2
14 _SENSE2+
15
RUN/SS2
100k
V_PULL-UP
(<7V)
PGOOD
0.1µF
CMDSH-3TR
1µF
10V
4.7µF
CMDSH-3TR
0.1µF
MBRS1100T3
T1, 1:1.8
10µH
+
33µF
25V
M1
10Ω
0.1µF
0.015Ω
M2
D1
MBRM
140T3
22µF
50V
150µF, 6.3V
PANASONIC SP
8
LT1121
V_OUT1
5V
3A; 4A PEAK
5
ON/OFF
32
1
220k
V_OUT3
12V
120mA
+
100k
1µF
25V
GND
180µF, 4V
PANASONIC SP
V_IN
7V TO
28V
M3
M4
D2
MBRM
140T3
L1
6.3µH
0.01Ω
V_OUT2
3.3V
5A; 6A PEAK
0.1µF
V_IN: 7V TO 28V
V_OUT: 5V, 3A/3.3V, 5A/12V, 120mA
SWITCHING FREQUENCY = 250kHz
MI, M2, M3, M4: NDS8410A
L1: SUMIDA CEP123-6R3MC
T1: 10µH 1:1.8 — DALE LPE6562-A262 GAPPED E-CORE OR BH ELECTRONICS #501-0657 GAPPED TOROID
3728 F12
Figure 12. LTC3728 High Efficiency Low Noise 5V/3A, 3.3V/5A, 12V/120mA Regulator
3728fb
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