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SC615 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC615 Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 12 page www.semtech.com 1 POWER MANAGEMENT SC615 Charge Pump Flash LED Driver July 11, 2005 Application Circuit Applications Features 500mA Output Current - Flash Mode 3.0V to 5.25V Input Range Two Selectable Modes - Flash and Spotlight External Flash Control Pin for Synchronization to a Camera Module or Graphics Controller Spotlight Mode Current Setting - 100mA Short Circuit, Over-Voltage, and Over-Temperature Protection Soft-Start Functionality Two Control Inputs for Maximum Versatility Shutdown Current < 2 µA Micro Lead-frame Package MLPD-10, 3mm x 3mm Mobile Camera Phones Digital Cameras PDAs with Built-in Cameras Multi-LED Backlit LCDs The SC615 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 re- quired to develop the output drive, providing a low EMI solution compared to inductive boost regulators. The SC615 has two modes of operation: Flash mode and Spotlight mode. The SC615 is capable of delivering 500mA of peak current for a duration of 500ms in Flash mode. In Spotlight mode the SC615 outputs 100mA and can remain enabled continuously. A minimum 0.5 Ω sense resistor is used to set the cur- rent through the LED in both modes. This resistor dissi- pates up to 0.125W, reducing the power dissipation re- quirement of the SC615. The flash input (FLASH) over- rides the control input (CTRL) to make sure the flash func- tion is activated when called for. The thermally efficient MLPD-10 package and ceramic bypass and bucket capacitors help make the SC615 a high output current driver that requires a minimal amount of PCB area. Description 3.0V to 5.25V SC615 VIN 1 C2- 2 C2+ 10 C1- 4 C1+ 8 VOUT 9 FLASH 5 CTRL 7 GND 3 ISET 6 1 µF 1 µF FLASH CTRL 1 µF white LED 0.5 Ω 10 µF |
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