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SC618

Semtech
Part Number SC618
Manufacturer Semtech
Description Charge Pump Flash LED Driver
Published May 29, 2010
Detailed Description SC618 Charge Pump Flash LED Driver with Safety Timer POWER MANAGEMENT Features Flash and spotlight — two selectable mode...
Datasheet PDF File SC618 PDF File

SC618
SC618

Overview
SC618 Charge Pump Flash LED Driver with Safety Timer POWER MANAGEMENT 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 40% of flash current „ Spotlight mode — up to 280mA output „ Spotlight mode —1x mode (under most conditions) www.
DataSheet4U.
com for best efficiency „ Input range — 3.
0V to 5.
25V „ External flash control pin for synchronization to a camera module or graphics controller „ Short-circuit, over-voltage, and over-temperature protection „ Soft-start functionality „ Separate flash and spotlight control inputs for maximum versatility „ Ultra-thin package MLPD-UT-10 — 3mm x 3mm x 0.
6mm „ „ Description The SC618 is a high-current charge pump designed specifically 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 SC618 has two modes of operation: flash mode and spotlight mode.
In flash mode, the SC618 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 SC618 outputs 40% 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 requirement of the SC618.
The flash input overrides the control input to make sure the flash function is activated .
The SC618 ultra-thin package provides both a low profile and high thermal efficiency.
Applications „ Mobile camera phones „ Digital cameras „ PDAs with built-in cameras Typical Application Circuit SC618 VIN VBAT VOUT GND ISET CTRL FLA...


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