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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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SC653 Arkusz danych(PDF) 1 Page - Semtech Corporation |
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SC653 Arkusz danych(HTML) 1 Page - Semtech Corporation |
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1 / 22 page  © 2009 Semtech Corporation POWER MANAGEMENT 1 SC653 Light Management Unit with 2 LDOs and SemPulse ® Interface Features Input supply voltage range — 2.9V to 5.5V Four programmable current sinks with 29 steps from 0mA to 25mA Very high efficiency charge pump driver system with three modes — 1x, 1.5x and 2x Two programmable 200mA low-noise LDO regulators Charge pump frequency — 250kHz SemPulse single wire interface Backlight current accuracy — ±1.5% typical Backlight current matching — ±0.5% typical Fade-in/fade-out feature for main backlight Automatic sleep mode (LEDs off ) — I Q = 100μA Shutdown current — 0.1μA (typical) Ultra-thin package — 2.3 x 2.3 x 0.6 (mm) Lead-free and halogen-free WEEE and RoHS compliant Applications Cellular phones, smart phones, and PDAs LCD modules Portable media players Digital cameras and GPS units Display backlighting and LED indicators Description The SC653 is a highly integrated light management unit that provides two low-noise LDOs, a multi-mode high efficiency charge pump, and four programmable LED drivers. Performance is optimized for use in single-cell Li- ion battery applications. The load and supply conditions determine whether the charge pump operates in 1x, 1.5x, or 2x mode. A program- mable fading feature can be enabled to gradually adjust the backlight current, simplifying control software. The low-dropout, low-noise linear regulators can be used for powering a camera module or other peripheral circuits. The SC653 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 SC653 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. The two LDOs can be enabled when the device is in sleep mode. SC653 IN SPIF BYP GND1 GND2 OUT BL1 CIN 2.2μF MAIN BACKLIGHT LDO1 C1+ SemPulse Interface VLDO1 = 1.5V to 3.3V VLDO2 = 1.2V to 1.8V COUT 2.2μF CLDO2 1μF CLDO1 1μF C2 2.2μF C1 2.2μF LDO2 BL2 BL3 BL4 C2+ C1- C2- ENL1 ENL2 VBAT = 2.9V to 5.5V GND1 GND2 GND1 CBYP 22nF GND1 GND2 GND2 GND2 US Patents: 6,504,422; 6,794,926 Typical Application Circuit October 21, 2009 |
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