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LM3519 Fiches technique(PDF) 1 Page - Texas Instruments |
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LM3519 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 20 page LM3519 Cin 4.7 PF L 2.2 PH D Cout 1 PF Gnd LED_rtn Vout Vin Sw En Vin Vout Vx Logic Voltage Signal Input LM3519 www.ti.com SNVS394A – AUGUST 2005 – REVISED SEPTEMBER 2005 LM3519 High Frequency Boost White LED Driver with High-Speed PWM Brightness Control Check for Samples: LM3519 1 FEATURES • Wide Input Voltage Range: 2.7V to 5.5V • Small Footprint SOT23-6 Package 2 • Drives 2 to 4 LEDs at 20mA • Up to 30kHz PWM Dimming Control Capability APPLICATIONS • >80% Peak Efficiency • LCD, White LED Backlighting on Mobile • Up to 8MHz Switching Frequency Phones • Small External Components: 1µH - • Digital Still Cameras and PDAs 3.3µH(typ.2.2 μH) Inductor and 1µF Output • General Purpose LED Lighting in Handheld Capacitor Devices • True Shutdown Isolation • Over-Voltage Protection DESCRIPTION The LM3519 drives up to 4 white LEDs with constant current to provide LCD backlighting in handheld devices. The LED current is internally set to 20mA. The series connection allows the LED current to be identical for uniform brightness and minimizes the number of traces to the LEDs. Brightness control is achieved by applying a PWM signal on enable with frequencies up to 30kHz. The LM3519 features a proprietary PFM regulation architecture with switching frequencies between 2MHz to 8MHz, minimizing inductor size. Over-voltage protection circuitry and high frequency operation permit the use of low-cost small output capacitors. During shutdown, the output is disconnected from the input in order to avoid leakage current path through the LEDs to ground. The LM3519 is available in a tiny 6-pin SOT23 package. Typical Application Figure 1. Typical Application Circuit 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2005, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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