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SC620 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC620 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 18 page  POWER MANAGEMENT 1 SC620 Octal LED Driver, General Purpose Current Sink with Serial Interface © 2009 Semtech Corporation Features Wide current setting range — 31.25μA to 25mA Eight identical current drivers with independent control 5% current matching, 7% accuracy I2C interface for microprocessor control I2C slave address 1110 000x Less than 1μA quiescent current in shutdown Low dropout voltage — ≤ 150mV Over-temperature protection MLPQ-UT-16 package (3mm x 3mm) Ultra-thin 0.6mm maximum package height Fully WEEE and RoHS compliant Applications LCD backlighting LED driver Multicolor and RGB LED driver General purpose current sink array General purpose digital output (open-drain) expander Auto-focus voice-coil driver Description The SC620 is a multi-purpose LED driver with eight identi- cal, independently controlled current sinks. Each current sink can drive an LED by connecting the LED’s anode to the system power supply and the cathode to the current sink input pin. Any combination of outputs can be enabled or disabled for optimal design flexibility. The SC620 also employs an adjustable global current gain setting register to allow the current setting step size to vary from 31.25μA to 500μA. This provides a wide range of options for LED variation and dimming functions. The maximum output is also scaled by this step size, with a maximum of 25mA at the highest step setting. Multi-colored and white LEDs with different forward volt- ages can be driven using the same SC620 due to its float- ing cathode technology. This feature allows each output pin to vary in voltage from 150mV to V IN - 1.5V. All current control is programmed using an I2C interface bus. Only a single input bypass capacitor is required — no other external resistors or capacitors are needed. The 3mm x 3mm MLPQ package and minimal support components make the SC620 an ideal solution for low-cost, area-con- scious backlighting designs. Battery SC620 IN SCL SDA EN GND GND GND GND ILED1 ILED2 ILED3 ILED4 ILED6 ILED7 ILED8 ILED5 Sub Panel Color/R/G/B LEDs 1μF SCL SDA EN Main Panel LED Backlighting Typical Application Circuit April 22, 2009 |
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