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SC619 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC619 Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 13 page POWER MANAGEMENT 1 SC619 Charge Pump Flash LED Driver with Safety Timer Features Flash and spotlight — two selectable modes Flash mode — up to 700mA output Flash mode — 500mA max output (over rated voltage, temperature, and load conditions) Flash mode safety timer shut-off — 1 second Spotlight mode set to 20% of flash current Spotlight mode — up to 140mA output Spotlight mode —1x mode (under most conditions) for best efficiency Input range — 3.0V to 5.25V External flash control pin for synchronization to a cam- era module or graphics controller Short-circuit, over-voltage, and over-temperature pro- tection Soft-start functionality Separate flash and spotlight control inputs for maxi- mum versatility Ultra-thin package MLPD-UT-10 — 3mm x 3mm x 0.6mm Applications Mobile camera phones Digital cameras PDAs with built-in cameras Description The SC619 is a high-current charge pump designed spe- cifically for use with white LEDs used in camera flash applications. Only two small bucket capacitors are required to develop the output drive, providing a low EMI solution compared to inductive boost regulators. The SC619 has two modes of operation: flash mode and spotlight mode. In flash mode, the SC619 is capable of delivering 500mA of regulated current for a duration of 500ms or up to 700mA for a reduced duration. A safety timer is also included to ensure the LED cannot be left on indefinitely and overheat. In spotlight mode the SC619 outputs 20% of the flash mode current and can remain enabled continuously. An external resistor is connected in series with the LED to set the current. In flash mode, this resistor can dissipate up to 175mW, reducing the power dissipation require- ment of the SC619. The flash input overrides the control input to make sure the flash function is activated . The SC619 ultra-thin package provides both a low profile and high thermal efficiency. SC619 VIN C2- C2+ C1- C1+ VOUT FLASH CTRL GND ISET 1μF 1μF FLASH CTRL 1μF RSET 10μF VBAT White LED Typical Application Circuit February 8, 2008 |
Similar Part No. - SC619_08 |
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Similar Description - SC619_08 |
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