Datasheet

12
LTC1504
 LINEAR TECHNOLOGY CORPORATION 1997
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
[phone]
FAX: [phone]
●
TELEX: 499-3977
●
www.linear-tech.com
APPLICATIONS INFORMATION
WUU
U
tance in series with the external inductor, slightly raising
its value. The SW trace need only be wide enough to
support the maximum peak current under short circuit
conditions—perhaps 1A. If a trace needs to be compro-
mised to make the layout work, this is the one. Note that
long traces at the SW node may aggravate EMI consider-
ations—don’t get carried away. If a Schottky diode is used
at the SW node, it should be located at the LTC1504 end
of the trace, close to the device pins.
The LTC Applications Department has constructed liter-
ally hundreds of layouts for the LTC1504 and related
parts, many of which worked and some of which are now
archived in the Bad Layout Hall of Fame. If you need layout
assistance or you think you have a candidate layout for the
Hall of Fame, give Applications a call at [phone].
Demo boards with properly designed layouts are available
and specialized layouts can be designed if required. The
applications team is also experienced in external compo-
nent selection for a wide variety of applications, and they
have a never-ending selection of tall tales to tell as well.
When in doubt, give them a call.
1504i LT/TP 0897 4K • PRINTED IN USA
TYPICAL APPLICATIONS
U
High Efficiency 5V to 2.5V Converter with Current Limit
SCSI-2 Active Terminator
I
MAX
SHDN
SS COMP
V
CC
GND
SW
FB
+
1µF
0.1µF
R
IMAX
*

C
IN
V
CC
5V
SHDN
7.5k
0.01µF
220pF
11.8k
12.1k
MBRS0530L
+
C
OUT
V
OUT
2.5V
L
EXT
C
IN
: AVX TPSE107M016R0125
C
OUT
: SANYO 16CV220GX
L
EXT
: COILCRAFT DO3316-473
*SELECT R
IMAX
VALUE USING CURRENT LIMIT THRESHOLD GRAPH ON PAGE 3
1504 • TA03
LTC1504
I
MAX
SHDN
SS COMP
V
CC
GND
SW
FB
4.7µF
CERAMIC
TERMPWR
7.5k
0.01µF
220pF
15k
12k
+
C
OUT
L
EXT
C
OUT
: AVX TPSC107M006R0150
L
EXT
: SUMIDA CD54-470
1504 • TA04
NC
NC
LTC1504
110Ω
110Ω
110Ω
110Ω
110Ω
18
TO
27
LINES
•
•
•
PART NUMBER DESCRIPTION COMMENTS
LTC1174 600mA, High Efficiency Step-Down Converter Nonsynchronous, Better Low Load Efficiency
LT
®
1307 Single Cell 600kHz DC/DC Converter Boost Mode, Micropower
LT1372 1.5A, 500kHz Step-Up Switching Regulator Boost Mode, High Power
LT1376 1.5A, 500kHz Step-Down Switching Regulator Nonsynchronous, 1.5A Max Current
LTC1433/LTC1434 450mA, Low Noise Current Mode Step-Down Converters Nonsynchronous, Better Low Load Efficiency
LT1507 1.5A, 500kHz Monolithic Buck Regulator Nonsynchronous, 1.5A Max Current
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