LM3410YSD

LM3410 525kHz/1.6MHz, Constant Current Boost and SEPIC LED Driver ADVANCE INFORMATION October 2007 LM3410 525kHz/1.6MHz, Constant Current Boost and SEPIC LED Driver with Internal Compensation General Description The LM3410 constant current LED driver is a monolithic, high frequency, PWM step-up DC/DC converter in 5-pin SOT23, 6-pin LLP, & 8-pin eMSOP packages. With a minimum of external components the LM3410 is easy to use. It can drive 2.5A typical peak currents with an internal 160mΩ NMOS switch. Switching frequency is internally set to either 525kHz or 1.60MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies up to 88% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 80nA. The LM3410 utilizes current-mode control and internal compensation to provide high-performance over a wide range of operating conditions. Additional features include dimming, pulse-by-pulse current limit, and thermal shutdown. Features ■ ■ ■ ■ ■ ■ ■ ■ ■ Space Saving SOT23-5 & 6-LLP Package Wide Input voltage range of 2.7V to 5.5V Wide Output voltage range of 3V to 24V 2.1A switch current over full temperature range Two High Switching Frequencies Available: — 525 kHz (LM3410-Y) — 1.6 MHz (LM3410-X) 160 mΩ NMOS Switch 190 mV Internal Voltage Reference Internal Soft-Start Current-Mode, PWM Operation Applications ■ ■ ■ ■ Portable Illumination LED Backlight Current Source LiIon Backlight OLED Driver Handheld Devices Typical Boost Application Circuit 30038501 © 2007 National Semiconductor Corporation 300385 www.national.com LM3410 Connection Diagrams Top View Top View Top View 30038503 5-Pin SOT23 30038505 30038504 6-Pin LLP 8-Pin eMSOP Ordering Information Frequency Order Number LM3410YMF LM3410YMFX 525 kHz LM3410YSD LM3410YSDX LM3410YMY LM3410YMYX LM3410XMF LM3410XMFX 1.6 MHz LM3410XSD LM3410XSDX LM3410XMY LM3410XMYX Package Type SOT23-5 LLP-6 eMSOP-8 SOT23-5 LLP-6 eMSOP-8 Package Drawing MF05A SDE06A MUY08A MF05A SDE06A MUY08A Supplied As 1000 units tape & reel 3000 units tape & reel 1000 units tape & reel 4500 units tape & reel 1000 units tape & reel 3500 units tape & reel 1000 units tape & reel 3000 units tape & reel 1000 units tape & reel 4500 units tape & reel 1000 units tape & reel 3500 units tape & reel www.national.com 2 LM3410 Pin Description - 5-Pin SOT23 Pin 1 2 3 4 5 Name SW GND FB DIM VIN Function Output switch. Connect to the inductor, output diode. Signal and power ground pin. Place the bottom resistor of the feedback network as close as possible to this pin. Feedback pin. Connect FB to external resistor divider to set output voltage. Dimming & shutdown control input. Logic high enables operation. Duty Cycle from 0 to 100%. Do not allow this pin to float or be greater than VIN + 0.3V. Supply voltage for power stage, and input supply voltage. Pin Description - 6 Pin LLP Pin 1 2 3 4 5 6 DAP Name PGND VIN DIM FB AGND SW GND Function Power ground pin. Place PGND and output capacitor GND close together. Supply voltage for power stage, and input supply voltage. Dimming & shutdown control input. Logic high enables operation. Duty Cycle from 0 to 100%. Do not allow this pin to float or be greater than VIN + 0.3V. Feedback pin. Connect FB to external resistor divider to set output voltage. Signal ground pin. Place the bottom resistor of the feedback network as close as possible to this pin & pin 4. Output switch. Connect to the inductor, output diode. Signal & Power ground. Connect to pin 1 & pin 5 on top layer. Place 4-6 vias from DAP to bottom layer GND plane. Pin Description - 8 Pin eMSOP Pin 1 2 3 4 5 6 7 8 DAP Name PGND VIN DIM FB AGND SW GND Function No Connect Power ground pin. Place PGND and output capacitor GND close together. Supply voltage for power stage, and input supply voltage. Dimming & shutdown control input. Logic high enables operation. Duty Cycle from 0 to 100%. Do not allow this pin to float or be greater than VIN + 0.3V. Feedback pin. Connect FB to external resistor divider to set output voltage. Signal ground pin. Place the bottom resistor of the feedback network as close as possible to this pin & pin 5 Output switch. Connect to the inductor, output diode. No Connect Signal & Power ground. Connect to pin 2 & pin 6 on top layer. Place 4-6 vias from DAP to bottom layer GND plane. 3 www.national.com LM3410 Physical Dimensions inches (millimeters) unless otherwise noted 6-Lead LLP Package NS Package Number SDE06A 5-Lead SOT23-5 Package NS Package Number MF05A www.national.com 4 LM3410 8-Lead eMSOP Package NS Package Number MUY08A 5 www.national.com LM3410 525kHz/1.6MHz, Constant Current Boost and SEPIC LED Driver Notes THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. 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All other brand or product names may be trademarks or registered trademarks of their respective holders. Copyright© 2007 National Semiconductor Corporation For the most current product information visit us at www.national.com National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530-85-86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +49 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 www.national.com