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SC615 fiches techniques PDF

Semtech Corporation - Charge Pump Flash LED Driver

Numéro de référence SC615
Description Charge Pump Flash LED Driver
Fabricant Semtech Corporation 
Logo Semtech Corporation 





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SC615 fiche technique
SC615
.com FlasChhaLrEgDe PDurimveprPOWER MANAGEMENT
t4UDescription
Features
eeThe SC615 is a high-current charge pump designed spe-
hcifically for use with white LEDs used in camera flash
Sapplications. Only two small bucket capacitors are re-
taquired to develop the output drive, providing a low EMI
asolution compared to inductive boost regulators.
w.DThe SC615 has two modes of operation: Flash mode
wand Spotlight mode. The SC615 is capable of delivering
w500mA of peak current for a duration of 500ms in Flash
mmode. In Spotlight mode the SC615 outputs 100mA
oand can remain enabled continuously.
.cA minimum 0.5sense resistor is used to set the cur-
rent through the LED in both modes. This resistor dissi-
Upates up to 0.125W, reducing the power dissipation re-
t4quirement 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.
eeThe thermally efficient MLPD-10 package and ceramic
hbypass and bucket capacitors help make the SC615 a
high output current driver that requires a minimal amount
Sof PCB area.
taApplication Circuit
‹ 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 < 2µA
‹ Micro Lead-frame Package MLPD-10, 3mm x 3mm
Applications
‹ Mobile Camera Phones
‹ Digital Cameras
‹ PDAs with Built-in Cameras
‹ Multi-LED Backlit LCDs
ww.Da3.0V to 5.25V
10µF
1µF
w t4U.com1µF
SheeFLASH
www.DataCTRL
1 VIN SC615 VOUT 9
8 C1+
GND 3
4 C1-
ISET 6
10 C2+
CTRL 7
2 C2-
FLASH 5
1µF
white LED
0.5
July 11, 2005
1 www.semtech.com

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