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LM3502SQ-16NOPB 数据表(PDF) 1 Page - Texas Instruments |
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LM3502SQ-16NOPB 数据表(HTML) 1 Page - Texas Instruments |
1 / 28 page LM3502-44 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 LM3502 www.ti.com SNVS339A – SEPTEMBER 2005 – REVISED AUGUST 2006 LM3502 Step-Up Converter for White LED Applications Check for Samples: LM3502 1 FEATURES • Wide Input Voltage: 2.5V to 5.5V • Small External Components 2 • Drive up to 4, 6, 8 or 10 White LEDs for Dual Display Backlighting • Low Profile Packages: <1 mm Height • >80% Efficiency – 10 Bump DSBGA • Output Voltage Options: 16V , 25V , 35V, and – 16 Pin WQFN 44V APPLICATIONS • Input Under-Voltage Protection • Internal Soft Start Eliminating Inrush Current • Dual Display Backlighting in Portable Devices • 1 MHz Constant Switching Frequency • Cellular Phones and PDAs DESCRIPTION The LM3502 is a white LED driver for lighting applications. For dual display or large single white LED string backlighting applications, the LM3502 provides a complete solution. The LM3502 contains two internal white LED current bypass FET(Field Effect Transistor) switches that are ideal for controlling dual display applications. The white LED current can be adjusted with a PWM signal directly from a microcontroller without the need of an RC filter network. With no external compensation, cycle-by-cycle current limit, over-voltage protection, and under-voltage protection, the LM3502 offers superior performance over other application specific standard product step-up white LED drivers. Typical Application Figure 1. Blacklight Configuration with 10 White LEDs 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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类似说明 - LM3502SQ-16NOPB |
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