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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC121 датащи(PDF) 1 Page - Semtech Corporation |
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SC121 датащи(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  © 2010 Semtech Corporation POWER MANAGEMENT 1 SC121 Low Voltage Synchronous Boost Regulator Features Input voltage — 0.7V to 4.5V Minimum start-up voltage — 0.85V Output voltage — fixed at 3.3V; adjustable from 1.8V to 5.0V Peak input current limit — 1.2A Output current at 3.3 V OUT — 80mA with V IN = 1.0V, 190mA with V IN = 1.5V Forced PWM operation at all loads Efficiency up to 94% Internal synchronous rectifier No forward conduction path during shutdown Switching frequency — 1.2MHz Soft-start startup current limiting Shutdown current — 0.1μA (typ) Ultra-thin 1.5 × 2.0 × 0.6 (mm) MLPD-UT-6 package Lead-free and halogen-free WEEE and RoHS compliant Applications MP3 players Smart phones and cellular phones Palmtop computers and handheld instruments PCMCIA cards and memory cards Digital cordless phones Personal medical products Wireless VoIP phones Small motors Description The SC121 is a high efficiency, low noise, synchronous step-up DC-DC converter that provides boosted voltage levels in low-voltage handheld applications. The wide input voltage range allows use in systems with single NiMH or alkaline battery cells as well as in systems with higher voltage battery supplies. It features an internal 1.2A switch and synchronous rectifier to achieve up to 94% efficiency and to eliminate the need for an external Schottky diode. The output voltage can be set to 3.3V with internal feedback, or to any voltage within the speci- fied range using a standard resistor divider. The SC121 operates exclusively in Pulse Width Modulation (PWM) mode for low ripple and fixed-frequency switching. Output disconnect capability is included to reduce leakage current, improve efficiency, and eliminate external com- ponents sometimes needed to disconnect the load from the supply during shutdown. Low quiescent current is maintained with a high 1.2MHz operating frequency. Small external components and the space saving MLPD-UT-6, 1.5×2.0×0.6 (mm) package make this device an excellent choice for small handheld applications that require the longest possible battery life. L1 CIN 3.3V Single Cell (1.2V) IN OUT LX EN FB SC121 COUT GND Typical Application Circuit April 13, 2010 |
Аналогичный номер детали - SC121 |
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Аналогичное описание - SC121 |
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