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STLD20D Arkusz danych(PDF) 1 Page - STMicroelectronics |
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STLD20D Arkusz danych(HTML) 1 Page - STMicroelectronics |
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1 / 31 page  October 2006 Rev 4 1/31 31 Order code Part number Package Marking Packing STLD20D-C8 SOT23-8L L2D Tape and reel STLD20D-DEF QFN 3x3 8L L2D Tape and reel STLD20D White LED power supply General features ■ Typical guaranteed efficiency: 80% ■ Drives up to 4 LEDs in series from a 2.8V up to 4.2V supply voltage ■ Constant current regulation over the whole operating voltage range ■ PWM control mode ■ Integrated load disconnect switch that opens the LEDs path in shutdown mode ■ Integrated soft start peak inductor current ■ Programmable peak inductor current (STLD20D-C8 only) ■ Shutdown pin allows digital dimming control up to 10kHz ■ Over voltage and over temperature protection with automatic restart ■ Low shutdown current (< 1µA) ■ Small external inductor (10µH) ■ Tiny external ceramic capacitor (1µF) Application ■ White Led supply for LCD backlight ■ Mobile phone ■ PDA and organizers, MP3 players, Toys Description The STLD20D is a constant switching frequency boost regulator mainly dedicated to supply up to 4 white LEDs connected in series. A constant LED current is achieved by sensing the LED current through a sensing resistor RLED (see Figure 3.). The device also includes a supply voltage rejection circuit that prevents from any possible flickering effect on the display that might happen during input supply voltage variation. An integrated Load Disconnect Switch open the LED path to eliminate the current consumption in shutdown mode. The maximum peak inductor current can be programmed (STLD20D-C8 only). SOT23-8L QFN 3x3 8L www.st.com |
Podobny numer części - STLD20D |
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Podobny opis - STLD20D |
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