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LM3503ITLX-44NOPB Fiches technique(PDF) 1 Page - Texas Instruments |
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LM3503ITLX-44NOPB Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 28 page LM3503-44 VIN Sw En1 En2 Fb Cntrl AGND PGND VOUT1 VOUT2 L 22 PH D CIN 4.7 PF COUT 1 PF R1 VSUPPLY MAIN: 2 to 5 LEDs SUB: 2 to 5 LEDs Logic Voltage Signal Inputs LM3503 www.ti.com SNVS329D – JULY 2005 – REVISED AUGUST 2006 LM3503 Dual-Display Constant Current LED Driver with Analog Brightness Control Check for Samples: LM3503 1 FEATURES 2 • Drives up to 4, 6, 8 or 10 White LEDs for Dual • Low Profile Packages: <1 mm Height Display Backlighting – 10 Bump DSBGA • >80% Peak Efficiency – 16 Pin WQFN • Output Voltage Protection Options: 16V, 25V, 35V & 44V APPLICATIONS • Input Under-Voltage Protection • Dual Display Backlighting in Portable devices • Internal Soft Start Eliminates Inrush Current • Cellular Phones and PDAs • 1 MHz Constant Switching Frequency • Analog Brightness Control • Wide Input Voltage Range: 2.5V to 5.5V DESCRIPTION The LM3503 is a white LED driver for lighting applications. For dual display backlighting applications, the LM3503 provides a complete solution. The LM3503 contains two internal white LED current bypass FET (Field Effect Transistor) switches. The white LED current can be adjusted with a DC voltage from a digital to analog converter or RC filtered PWM (pulse-width-modulated) signal at the Cntrl pin. With no external compensation, cycle-by-cycle current limit, output over-voltage protection, input under-voltage protection, and dynamic white LED current control capability, the LM3503 offers superior performance over other step-up white LED drivers. Typical Application 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 © 2005–2006, 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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