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SC644 Arkusz danych(PDF) 1 Page - Semtech Corporation |
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SC644 Arkusz danych(HTML) 1 Page - Semtech Corporation |
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1 / 26 page  © 2009 Semtech Corporation POWER MANAGEMENT SC644 Light Management Unit with 4 LDOs and SemPulse ® Interface Features Input supply voltage range — 2.9V to 5.5V Very high efficiency charge pump driver system with three modes — x, .5x, and 2x Six programmable current sinks with 29 increments from 0mA to 25mA Four programmable 200mA low-noise LDO regulators Programmable driver configurations for main and sub-display backlight Fade-in/fade-out feature for main and sub display backlight SemPulse single wire interface Backlight current accuracy — ±.5% typical Backlight current matching — ±0.5% typical Automatic sleep mode with LEDs off Shutdown current — 0.µA typical Ultra-thin package — 3 x 3 x 0.6 (mm) Lead free and halogen free WEEE and RoHS compliant Applications Cellular phones, smart phones, and PDAs LCD display modules Portable media players Digital cameras and GPS units Display backlighting and LED indicators Description The SC644 is a high efficiency charge pump LED driver using Semtech’s proprietary charge pump technology. Performance is optimized for use in single cell Li-ion battery applications. Display backlighting is provided through six matched current sinks with integrated fade-in and fade-out con- trols. The LEDs can be driven as a single set or as two different sets (for main and sub displays) with indepen- dent controls. Four low noise, low dropout (LDO) regulators are provided to supply power for camera module I/O and other peripheral circuits. The SC644 uses the proprietary SemPulse ® single wire interface. This interface controls all functions of the device, including backlight currents and LDO voltage outputs. The single wire interface minimizes microcontroller and interface pin counts. The SC644 enters sleep mode when all the LED drivers are disabled. In this mode, the quiescent current is reduced while the device continues to monitor the SemPulse inter- face. Any combination of LDOs may be enabled when in sleep mode. 4.7µF SemPulse Interface Main Backlight 4.7µF VBAT = 2.9V to 5.5V 1.0µF 1.0µF 22nF 2.2µF 2.2µF VLDO1 = 1.5V to 3.3V VLDO2 = 1.2V to 1.8V BL5 BL4 BL3 BL2 BL1 PGND AGND BYP SPIF IN OUT 1.0µF 1.0µF VLDO3 = 1.5V to 3.3V Motor SC644 Sub Backlight LDO1 LDO2 LDO3 LDO4 BL6 Typical Application Circuit October 8, 2009 US Patents: 6,504,422; 6,794,926 |
Podobny numer części - SC644 |
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Podobny opis - SC644 |
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