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LM2707MFX Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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LM2707MFX Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
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1 / 19 page  LM2707 Inductive-Boost Series LED Driver with Programmable Oscillator Frequency General Description The LM2707 is a magnetic boost regulator specifically de- signed for white LED drive applications. Tightly regulated LED currents, exceptional LED brightness uniformity, and very high LED-drive power efficiency (>80%) can all be achieved by stacking the LEDs in series between the LM2707 output and the low-voltage feedback pin (0.515V). The LM2707 requires only a few small external components. A small inductor with a low saturation current rating can safely be used because the tightly controlled current limit circuit prevents large inductor current spikes, even at start- up. The output capacitor can also be small due to the tightly controlled output over-voltage protection circuit. The LM2707 is an excellent choice for display backlighting and other general-purpose lighting functions in battery pow- ered applications. The 2.3V-to-7V input voltage range of the device easily accommodates single-cell Lithium-Ion batter- ies and battery chargers. The LM2707 features 18V output capability, PFM regulation, and a high-current switching transistor (400mA peak). These characteristics allow the part to drive a series string of 2-to-4 LEDs with forward currents between 0 and 40mA. LED brightness can be adjusted dynamically simply by applying a PWM signal to the enable (EN) pin. The PWM signal can be as fast as 50kHz because the LM2707 has a fast turn-on time. In addition to LED-drive applications, the LM2707 can also be used as a general purpose DC-DC voltage regulator in boost converter applications. The LM2707 is available in a SOT23-8 surface mount pack- age. Features n Excellent LED Drive Capability: 3 LED String: 30mA 4 LED String: 20 mA 6 LEDs (2 strings of 3): 15 mA n Very High LED Drive Efficiency: > 80% n Low Feedback Voltage: 515mV n Low-Resistance NMOS Power Switch: 0.6 Ω n High-Speed PWM Brightness Control Capability n Over-Voltage Protection (18V min, 19V typ, 20V max) n Inrush and Inductor Current Limiting n 2.3V - 7V Input Voltage Range n Requires Only a Few External Components n No External Compensation Needed n Programmable Oscillator Frequency n ON/OFF Pin n Small SOT23-8 Package Applications n White LED Drive for Display Backlights n LED Flashlights n General Purpose LED Lighting n Step-up DC/DC Voltage Conversion Typical Application Circuit 20099225 February 2005 © 2005 National Semiconductor Corporation DS200992 www.national.com |
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