32
LTC1628/LTC1628-PG
1628fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1998
LT/TP 0302 1.5K REV B • PRINTED IN USA
Figure 13. LTC1628 5V/4A, 3.3V/4A Regulator
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PART NUMBER DESCRIPTION COMMENTS
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IN
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3.5V ≤ V
IN
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No Heat Sink, 3.5V ≤ V
IN
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Adaptive Power, No R
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and PolyPhase are trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation.
0.1µF
4.7µF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
+
22µF
50V
D1
MBRM
140T3
D2
MBRM
140T3
M1A M1B
M2A M2B
1µF
10V
0.1µF
10Ω
0.015Ω
0.015Ω
INTV
CC
3.3V
0.1µF
20k
1%
105k
1%
33pF
15k
33pF
15k
220pF
220pF
1000pF
1000pF
0.1µF
20k
1%
63.4k
1%
RUN/SS1
SENSE1
+
SENSE1
–
V
OSENSE1
FREQSET
STBYMD
FCB
I
TH1
SGND
3.3V
OUT
I
TH2
V
OSENSE2
SENSE2
–
SENSE2
+
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
LTC1628
L1
8µH
L2
8µH
47µF
6.3V
56µF, 4V
GND
V
OUT2
3.3V
3A; 4A PEAK
V
OUT1
5V
3A; 4A PEAK
V
IN
5.2V TO
28V
1628 F13
+ +
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
27pF
27pF
0.1µF
CMDSH-3TR
CMDSH-3TR
0.01µF
FLTCPL
PGOOD
V
PULL-UP
(<7V)
FLTCPL*
(PGOOD)
*PGOOD ON THE LTC1628-PG
U
TYPICAL APPLICATIO
