LTC1628 Datasheet, PDF (32/32 Pages) Linear Technology – High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

LTC1628/LTC1628-PG
TYPICAL APPLICATIO
0.1µF
27pF
105k
1%
1000pF
20k
1%
INTV_CC
33pF
0.01µF
15k
220pF
33pF
3.3V
15k
220pF
20k
1%
63.4k
1000pF
27pF
1%
FLTCPL
1
RUN/SS1
2 _SENSE1+
FLTCPL* ²⁸
(PGOOD)
27
TG1
3 _SENSE1–
26
SW1
4
V_OSENSE1
5
FREQSET
6
STBYMD
25
BOOST1
24
V_IN
23
BG1
7
FCB
8
I_TH1
22
EXTV_CC
LTC1628
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
0.1µF
M1A
CMDSH-3TR
1µF
10V
4.7µF
CMDSH-3TR
10Ω
0.1µF
0.1µF
M2A
L1
8µH
0.015Ω
M1B
22µF
50V
D1
MBRM
140T3
47µF
6.3V
56µF, 4V
D2
MBRM
M2B
140T3
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 = 300kHz
MI, M2: FDS8936A
L1, L2: 8µH SUMIDA CEP1238R0MC
OUTPUT CAPACITORS: PANASONIC SP SERIES
1628 F13
*PGOOD ON THE LTC1628-PG
Figure 13. LTC1628 5V/4A, 3.3V/4A Regulator
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Adaptive Power, No R_SENSE and PolyPhase are trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation.
32 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
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1628fa LT/TP 0300 2K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1998