LT1301 查看數據表（PDF） - Linear Technology
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LT1301 Datasheet PDF : 12 Pages
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LT1301
APPLICATIONS INFORMATION
Capacitor Selection
Low ESR capacitors are required for both input and output
of the LT1301. ESR directly affects ripple voltage and
efficiency. For surface mount applications AVX TPS series
tantalum capacitors are recommended. These have been
specially designed for SMPS and have low ESR along with
high surge current ratings. For through-hole applications
Sanyo OS-CON capacitors offer extremely low ESR in a
small size. Again, if peak switch current is reduced using
the ILIM pin, capacitor requirements can be relaxed and
smaller, higher ESR units can be used. Suggested capaci-
tor sources are listed in Table 2.
Diode Selection
Best performance is obtained with a Schottky rectifier
diode such as the 1N5817. Phillips Components makes
this in surface mount as the PRLL5817. Motorola makes
the MBRS130LT3 which is slightly better and also in
surface mount. For lower output power a 1N4148 can be
used although efficiency will suffer substantially.
Layout Considerations
The LT1301 is a high speed, high current device. The input
capacitor must be no more than 0.2˝ from VIN (pin 6) and
ground. Connect the PGND and GND (pins 8 and 1)
together under the package. Place the inductor adjacent to
SW (pin 7) and make the switch pin trace as short as
possible. This keeps radiated noise to a minimum.
TYPICAL APPLICATIONS N
Four-Cell to 5V Converter
L1
33µH
C2
100µF
+
1N5817
4 CELLS
NC
+ C1
100µF
VIN
SW
ILIM
SENSE
LT1301
SHDN
GND
SELECT
PGND
0.1µF
L2
33µH
5V OUTPUT
200mA
80 to 83% EFFICIENT
AT ILOAD > 10mA
+ C3
100µF
8
SHUTDOWN
LT1301 TAO3
Step-Up Converter with Automatic Output Disconnect
470Ω
L1*
10µH
1N5817
2N4403
5V, 200mA
NC
2×
AA
CELL +
SELECT
VIN
SHUTDOWN SHDN
SW
100µF
LT1301
+
100µF
NC ILIM
GND
SENSE
PGND
0.1µF
*SUMIDA CD54-100LC
COILCRAFT DO3316-223
LT1301 TA4
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