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LM3500 Fiches technique(PDF) 1 Page - Texas Instruments |
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LM3500 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 25 page LM3500 www.ti.com SNVS231F – MAY 2004 – REVISED APRIL 2007 LM3500 Synchronous Step-up DC/DC Converter for White LED Applications Check for Samples: LM3500 1 FEATURES input and output • Thermal Shutdown 2 • Synchronous rectification, high efficiency and no external schottky diode required • 0.1µA shutdown current • Uses small surface mount components • Small 8-bump thin micro SMD package • Can drive 2-5 white LEDs in series APPLICATIONS – (may function with more low-VF LEDs) • LCD Bias Supplies • 2.7V to 7V input range • White LED Backlighting • Internal output over-voltage protection (OVP) circuitry, with no external zener diode required • Handheld Devices – LM3500-16: 15.5V OVP; LM3500-21: 20.5V • Digital Cameras OVP. • Portable Applications • True shutdown isolation • Input undervoltage lockout • Requires only small ceramic capacitors at the DESCRIPTION The LM3500 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other lighting functions. With fully intergrated synchronous switching (no external schottky diode required) and a low feedback voltage (500mV), power efficiency of the LM3500 circuit has been optimized for lighting applications in wireless phones and other portable products (single cell Li-Ion or 3-cell NiMH battery supplies). The LM3500 operates with a fixed 1MHz switching frequency. When used with ceramic input and output capacitors, the LM3500 provides a small, low-noise, low-cost solution. Two LM3500 options are available with different output voltage capabilities. The LM3500-21 has a maximum output voltage of 21V and is typically suited for driving 4 or 5 white LEDs in series. The LM3500-16 has a maximum output voltage of 16V and is typically suited for driving 3 or 4 white LEDs in series (maximum number of series LEDs dependent on LED forward voltage). If the primary white LED network should be disconnected, the LM3500 uses internal protection circuitry on the output to prevent a destructive over-voltage event. A single external resistor is used to set the maximum LED current in LED-drive applications. The LED current can easily be adjusted using a pulse width modulated (PWM) signal on the shutdown pin. In shutdown, the LM3500 completely disconnects the input from output, creating total isolation and preventing any leakage currents from trickling into the 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 © 2004–2007, 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. |
Numéro de pièce similaire - LM3500_14 |
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Description similaire - LM3500_14 |
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