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LT1301C Datasheet(PDF) 8 Page - Linear Technology |
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LT1301C Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 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 C3 100µF L2 33µH 0.1µF 5V OUTPUT 200mA 80 to 83% EFFICIENT AT ILOAD > 10mA + L1 33µH C2 100µF 1N5817 C1 100µF 4 CELLS SW NC ILIM PGND GND SENSE LT1301 SELECT LT1301 TAO3 SHDN SHUTDOWN VIN + + 1N5817 2N4403 5V, 200mA + L1* 10µH *SUMIDA CD54-100LC COILCRAFT DO3316-223 100µF 100µF 470 Ω 0.1µF 2 × AA CELL SW ILIM PGND GND SENSE LT1301 SELECT LT1301 TA4 SHDN NC NC SHUTDOWN VIN + Step-Up Converter with Automatic Output Disconnect |
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