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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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SC1417B Fiches technique(PDF) 1 Page - Semtech Corporation |
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SC1417B Fiches technique(HTML) 1 Page - Semtech Corporation |
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1 / 11 page  POWER MANAGEMENT 1 www.semtech.com SC1417B MicroPower, 620kHz PWM, Step-up DC/DC Converter Revision: August 1, 2006 The SC1417B is a fixed frequency, current mode step-up dc-dc converter. It operates over a wide input supply range of 1.5V to 12V, making it suitable for battery input and TFT-LCD applications. The 620kHz constant frequency oscillator minimizes the size of external components and allows simple filtering for noise sensitive environments. The integrated power NPN supports peak currents of up to 0.9A enabling the device to support 150mA at 15V from a 5V supply. The maximum switch duty cycle of 85% (typical) allows output to input voltage ratios as high as 6.5 in step-up configurations, thus allowing 2V to 12V boost operation. The SC1417B features a low battery detector and a 200mV reference circuit which remains active during shut down. The part consumes less than 50µA in shutdown. The low battery detect output goes low when the input battery voltage has dropped below a user programmable level. Pulse-by-pulse current limit and thermal shutdown protect the converter during load faults. The SC1417B is available in a MSOP-8 surface mount package. 150mA @ 15V from 5V input Internal switch peak current of 0.9A Programmable output voltage Powers up into full load Pulse-by-pulse current limit/thermal shutdown 620kHz fixed frequency current mode converter Low current shutdown mode extends battery life 18V output capability Low battery detector MSOP-8 package. Available in Lead-free package, fully WEEE and RoHS compliant Pin-for-pin compatible with LT1317B TFT-LCD Bias supplies Constant current LED bias supplies Pagers GPS receivers Battery backup SEPIC converters Operates from 1.5V to 12V supply voltage High efficiency >85% Description Features L1 10uH R5 33k C1 47uF R4 604k R2 1M D1 SMB5819 R1 1.0M C2 47uF U1 SC1417B 8 1 2 3 4 5 6 7 LBO COMP FB EN GND LX IN LBI 3.3V@250mA LBO OUT 2 Cells R3 1M R6 130k C3 3.3nF (Alkaline) Applications Typical Application Circuit ) 4 R 1 R 1 ( 22 . 1 V OUT + • = |
Numéro de pièce similaire - SC1417B |
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Description similaire - SC1417B |
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