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SP7618/9/9A Programmable Low-side Driver for Camera Flash Applications

The SP7618/9/9A is a programmable low-side driver designed for camera flash applications. It offers a maximum current of 1A, very low dropout voltage, and power-saving shutdown mode. It is available in a small 2x3mm DFN package.

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SP7618/9/9A Programmable Low-side Driver for Camera Flash Applications

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  1. SP7618/9/9A Programmable Low-side Driver for Camera Flash Applications

  2. Li + LED VIN SP7618 LED EN Control CTRL GND GNDP GNDP OFF ON Features and Benefits • Very low dropout voltage: 100mV typ @ 1A load • 1A Maximum Current • No external components • Power-saving shutdown mode of 1uA typical • Fast turn-on (<50µS) • Thermal Shutdown Protection • Accurate Current Regulation Down to Dropout Voltage • Space saving 8 pin 2mm x 3mm DFN package • SP7618 – Built-in Current DAC: Programmable: Output Current adjustable with 33mA steps • SP7619 – Factory pre-selected flash and torch two current level (500/200) No external program needed • SP7619A– Factory pre-selected flash and torch two current level (700/200) No external program needed Small 2x3 mm DFN-8 package! Available Company Confidential

  3. SP7618/9 Competitive Update *ADD Microtech’s product portfolio: 1. Linear regulators 2. Low dropout regulators 3.WLED Drivers 4. High power operational amplifiers Company Confidential

  4. Target Applications • Mobile Phone Camera Flash • Mega-pixel camera phones require LED flash • Traditional Xenon tube solutions big and expensive • Digital Camcorder • Torch mode for motion picture • Autofocus assist beam • High power LED flashlight • Camera Flash Module • Red-eye Reduction Flashing mode • High End Smart Phone with Multi-Shooting/Scene Flashing Mode Company Confidential

  5. Value Proposition LED Current of 1 Amps Li Ion or Regulated Vin Ultra low dropout 100mV @ 1A SP7618 Control Light via Built-in DAC (33 mA step) SP7619/9A PWM modulation/ Duty cycle Company Confidential 5

  6. Value Proposition • Industry’s first low side programmable output current LED driver solution • Up to 1A output current! • Ultra low dropout • User programmable ILED current for flexible picture taken under different environment • Built-in current DAC for ILED control • Output regulation from 33mA to 1033mA in 33mA / step • One device fits all LED flash need • Extremely low dropout voltage • 100mV typ. @ 1A • Industry’s smallest 1A LED driver in size • 2x3mm DFN8 package (Industry standard DFN footprint) • Lead Free available • Ease of use • No external components • Designed for Li-Ion or 3 alkaline battery cells to power the LEDs directly • 4 sec timeout for LED protection • Consumer temperature range • -40°C to +85°C operation • Lead-free packaging available Company Confidential

  7. SP7618 Advantages • No external components needed • Optional 0.1uF 0402 bypass cap • Built-in current DAC for output control • Output regulation 33mA to 1033mA in 33mA steps • Output can be programmed using a digital pulse signals sequentially (up to 31 pulses) • No need big sense resistors • Very low dropout voltage • 100mV@1A dropout can use high Vf LEDs without boost function Company Confidential

  8. SP7618 Advantages • Built-in protection features: • Over temperature when die > 160degC • 4 second timeout for LED outputs > 266mA • Small solution size • 2x3mm 8 pin DFN with at most a 0.1uF bypass in 0402 size recommended Company Confidential

  9. SP7618 – Notes • Need to setup with serial pulses from a controller • Most applications have a controller available • No need for expensive sense resistors • Continuous output can’t be more than 266mA • Any current > 266mA are considered Flash • Timeout function protects the LED under software failure Company Confidential

  10. Key Selling Points • SP7618 • User programmable ILED • One device supports from 33mA to 1A ILED which fits difference current requirement • SP7619 • Two preset output current: 200mA and 500mA • SP7619A • Two preset output current: 200mA and 700mA • No external components Company Confidential

  11. Appendix

  12. Result Is Obvious LED Flash No Flash Conventional Flash Company Confidential

  13. SP7618 Application Circuit Company Confidential

  14. SP7618 Timing Diagram Fast Turn-On and Off Wakeup Time = 50us max Turn-off Shutdown = 30us max Turn-off Sleep Mode = 300us max Company Confidential

  15. SP7618 Driving PWF1 LED Company Confidential 15

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