LTC3727_15 Datasheet, PDF (29/32 Pages) Linear Technology – High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

TYPICAL APPLICATIO S
LTC3727/LTC3727-1
0.1μF
27pF
105k
1000pF
20k
1%
1%
0.01μF
10k
1000pF
33pF
f_SYNC
15k _220pF
33pF
3.3V
15k _220pF
20k
1%
280k
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
LTC3727
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
CMDSH-3
1μF
10V
4.7μF
CMDSH-3
0.1μF
M1A
10Ω
0.1μF
M2A
M1B
22μF
50V
D1
MBRM
140T3
C_OUT1
47μF
6.3V
C_OUT2 100μF 16V
D2
MBRM
M2B
140T3
L2
15μH
0.015Ω
V_OUT1
5V
5A; 6A PEAK
GND
V_IN
15V TO
28V
V_OUT2
12V
4A; 5A PEAK
0.1μF
C_OUT1: PANASONIC EEFCDOJ470R
C_OUT2: SANYO OS-CON 16SVP100M
V_IN: 15V TO 28V
V_OUT: 5V, 5A/12V, 4A
SWITCHING FREQUENCY = 250kHz
MI, M2: FAIRCHILD FDS6680A
3727 F12
L1: 8μH SUMIDA CDEP134-8R0
L2: 15μH COILTRONICS UP4B-150
Figure 12. LTC3727 12V/4A, 5V/5A Regulator with External Frequency Synchronization
3727fc
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