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LM3501 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3501 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 27 page GND FB VSW VIN SHDN L 22 PH LM3501-16 VOUT AGND A1 CNTRL C3 B1 C1 C2 B3 A2 A3 <0.3V >1.1V VIN 2.7V - 5.5V Voltage Control R2 24: COUT 1PF Ceramic CIN 1PF Ceramic LM3501 www.ti.com SNVS230C – DECEMBER 2003 – REVISED MAY 2013 LM3501 Synchronous Step-up DC/DC Converter for White LED Applications Check for Samples: LM3501 1 FEATURES APPLICATIONS 2 • Synchronous Rectification, High Efficiency • LCD Bias Supplies and no External Schottky Diode required • White LED Back-Lighting • Uses Small Surface Mount Components • Handheld Devices • Can Drive 2-5 White LEDs in Series (May • Digital Cameras Function with More Low VF LEDs) • Portable Applications • 2.7V to 7V Input Range • True Shutdown Isolation, no LED Leakage DESCRIPTION Current The LM3501 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for • DC Voltage LED Current Control display backlighting and other lighting functions. With • Input Undervoltage Lockout fully integrated synchronous switching (no external • Internal Output Over-Voltage Protection (OVP) schottky diode required) and a low feedback voltage Circuitry, with no External Zener Diode (515 mV), power efficiency of the LM3501 circuit has Required LM3501-16: 15.5V OVP; LM3501-21: been optimized for lighting applications in wireless phones and other portable products (single cell Li-Ion 20.5V OVP. or 3-cell NiMH battery supplies). The LM3501 • Requires Only a Small 16V (LM3501-16) or 25V operates with a fixed 1 MHz switching frequency. (LM3501-21) Ceramic Capacitor at the Input When used with ceramic input and output capacitors, and Output the LM3501 provides a small, low-noise, low-cost • Thermal Shutdown solution. • 0.1µA shutdown Current • Small 8-Bump Thin DSBGA Package Typical Application Circuit Figure 1. Typical 3 LED 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 © 2003–2013, 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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