LTC3728 Datasheet, PDF (30/32 Pages) Linear Technology – Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator

LTC3728
TYPICAL APPLICATIO S
0.1µF
27pF
20k
1%
105k
1%
1000pF
0.01µF
10k
1000pF
33pF
f_SYNC
15k _220pF
33pF
3.3V
15k _220pF
20k
1%
63.4k
27pF
1%
1000pF
1
RUN/SS1
28
PGOOD
2 _SENSE1+
27
TG1
3 _SENSE1–
26
SW1
4
V_OSENSE1
5
PLLFLTR
6
PLLIN
25
BOOST1
24
V_IN
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
V_PULL-UP
(<7V)
PGOOD
L1
8µH
0.015Ω
0.1µF
M1
CMDSH-3TR
10Ω
0.1µF
1µF
10V
4.7µF
CMDSH-3TR
22µF
50V
47µF
6.3V
56µF, 4V
0.1µF
M2
L2
0.015Ω
8µH
V_OUT1
5V
3A; 4A PEAK
GND
V_IN
5.2V TO
28V
V_OUT2
3.3V
3A; 4A PEAK
0.1µF
V_IN: 5.2V TO 28V
V_OUT: 5V, 4A/3.3V, 4A
SWITCHING FREQUENCY = 250kHz TO 550kHz
MI, M2: FDS6982S
L1, L2: 8µH SUMIDA CEP1238R0MC
OUTPUT CAPACITORS: PANASONIC SP SERIES
3728 F13
Figure 13. LTC3728 5V/4A, 3.3V/4A Regulator with External Frequency Synchronization
3728fb
30