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LX1744 DUAL OUTPUT BOOST LED DRIVER/LCD BIAS New Product Information and Sales Kit Manufactured by: Microsemi Integrated Products Garden Grove Telephone: 714-898-8121 More than solutions – enabling possibilities LX1744 Dual Output Boost – LED Driver/LCD Bias INTRODUCTION WWW . Microsemi .C OM CONFIDENTIAL INFORMATION This new product introduction guide is intended for use only by Microsemi’s sales people and authorized representatives and distributors. This material can be adapted for customer presentations, but the sales strategy and summary [pricing, availability, etc.] is confidential and should not be shown to customers DESCRIPTION The LX1744 is a compact high efficiency step-up boost regulator for driving white or color LED’s in LCD lighting applications plus an integrated LCD Bias generator within one package. Featuring a pseudo-hysteretic pulse frequency modulation topology, the LX1744 was designed for maximum efficiency, reduced board size, and minimal cost making it ideal for PDA and digital camera applications. Utilizing an internal N-Channel FET for LCD Bias generation minimizes PCB board space, whereas the use of an external N-Channel MOSFET for the higher current LED regulator portion results in maximum electrical efficiency. With a shutdown (Sleep) current of less than 1µA, the LX1744’s is optimized for portable battery powered systems. The input voltage ranges from 1.6V to 6.0V, allowing for a wide selection of system battery voltages. Start-up is guaranteed at 1.6V input, with sustained operation to as little as 1.1V. LED drive currents are easily programmed using one external current sense resistor in series with the LED’s. In this configuration, LED current provides a feedback signal to the FB pin, maintaining constant current regardless of varying LED forward voltage (VF). Depending on the MOSFET selected, the LX1744 is capable of achieving an LED drive power in excess of 1.5W. The LX1744 is available in the 14-Pin TSSOP, and the miniature 16-Pin MLP requiring minimal PCB area. SUMMARY The LX1744 is a small, cost effective solution that combines Boost LDC bias and a LED driver. Copyright © 2002 Rev. 1.0 8/22/03 Page 2 New Product Information and Sales Kit SALES KIT The LX1744 has an additional feature for simple dynamic adjustment of both the LED drive current (0% to 100% full range dimming) and the LCD Bias output voltage (up to ±15% typ). Incorporating an internal RC filter, designers can make this adjustment via a direct PWM input signal or an analog reference signal applied to the ADJx pin. Any PWM amplitude is easily accommodated with a single external resistor. LX1744 Dual Output Boost – LED Driver/LCD Bias KEY PRODUCT INFORMATION LFB Control Logic Driver DRV SRC Reference Logic BRT 50pF GND 2.5MΩ 4µA WWW . Microsemi .C OM BLOCK DIAGRAM CS LSHDN Shutdown Logic IN SHDN OVP FB Control Logic REF SW Driver Reference Logic ADJ 50pF 2.5MΩ 4µA SALES KIT Copyright © 2002 Rev. 1.0 8/22/03 Page 3 New Product Information and Sales Kit LX1744 Dual Output Boost – LED Driver/LCD Bias KEY FEATURES > 90% Maximum Efficiency Low Quiescent Supply Current Externally Programmable Peak Inductor Current Limit For Maximum Efficiency Logic Controlled Shutdown < 1µA Shutdown Current Dynamic Output LED Current and LCD Bias Voltage Adjustment Via Analog Reference Or Direct PWM Input 14-Pin TSSOP or 16-Pin MLPQ Package WWW . Microsemi .C OM APPLICATIONS Pagers Wireless Phones PDAs Handheld Computers General LCD Bias Applications SALES KIT Copyright © 2002 Rev. 1.0 8/22/03 Page 4 New Product Information and Sales Kit LX1744 Dual Output Boost – LED Driver/LCD Bias TYPICAL APPLICATIONS ILED = 20mA to 0mA VBAT = 1.6V to 6.0V 47µH 1206 Case Size - VLCD WWW . Microsemi .C OM L1 C1 4.7µF DRV IN SRC SW OVP VLCD = VIN to 25V LFB CS LX1744 ON OFF ON OFF LSHDN FB RSET 15Ω BRT SHDN REF ADJ GND LED Driver with Full-Range Dimming plus LCD Bias With Contrast Adjustment Via PWM Input ILED = 20mA to 0mA L1 VBAT = 1.6V to 6.0V 47µH 1206 Case Size - VLCD C1 4.7µF DRV IN SRC SW OVP VLCD = VIN to 25V LFB CS LX1744 LSHDN FB ON OFF ON OFF BRT SHDN RSET 15Ω REF ADJ GND The component values shown are only examples for a working system. Actual values will vary greatly depending on desired parameters, efficiency, and layout constraints. Copyright © 2002 Rev. 1.0 8/22/03 Page 5 New Product Information and Sales Kit SALES KIT LED Driver with Full-Range Dimming plus LCD Bias With Contrast Adjustment Via Analog Voltage Input LX1744 Dual Output Boost – LED Driver/LCD Bias COMPETITIVE ANALYSIS LX1744 Competitor Device Topology Input Supply Range Package Temperature Range Microsemi LX1744 PFM/COT* 1.6 to 6V 16 pin TSSOP/ 16 pin MLPQ -40 to 85°C Linear Tech LT1944 PFM/COT 1.2 to 15V 10 pin MSOP -40 to 85°C Texas Instruments TPS61045 1.8 to 6V 8 pin QFN -40 to 85°C MAXIM MAX629 2.7 TO 5.5V 8 pin SOIC -40 to 85°C Bias Only 28V Max National Semiconductor LM2703 2.2 to 7V SOT23-5 -40 to 125°C Bias Only 20V Max PFM/COT SMT Boost LED and Boost Bias 25V Max SMT Boost LED and Boost Bias 34V Max Bias Only 28V Max DAC output control WWW . Microsemi .C OM PFM/ COT/MOT PFM/ COT/MOT Notes *COT = Constant or fixed off –time, MOT = Maximum on-time MICROSEMI ALTERNATIVE Competitor Microsemi Device Topology Input Supply Range Package Temperatur e Range Notes LX1745 PFM/COT 1.6 to 6V 20 pin TSSOP0 -40 to 85°C SMT Boost LED and Two Boost Bias 25V Max SALES KIT Copyright © 2002 Rev. 1.0 8/22/03 Page 6 New Product Information and Sales Kit LX1744 Dual Output Boost – LED Driver/LCD Bias SALES STRATEGY • Portable Display Products • LED LCD panels • Step up conversion for both LCD bias and LED drive • Two Cell Alkaline, NiCd and NiMH Battery sources WWW . Microsemi .C OM Find Sockets Positioning • Choice of small low profile packages • Guaranteed startup voltage of 1.6V • Useful over wide temperature range • High efficiency PFM topology • Low frequency direct PWM bias and LED adjust Important Facts to Remember • No pin-for-pin competition SALES KIT Copyright © 2002 Rev. 1.0 8/22/03 Page 7 New Product Information and Sales Kit LX1744 Dual Output Boost – LED Driver/LCD Bias SUMMARY Device Package LX1744CPW LX1744CLQ 14pin TSSOP 16pin MLPQ DC 1000+ $1.60 $1.64 Contact Factory Contact Factory Note: WWW . Microsemi .C OM Pricing Availability Samples: LX1744CPW LX1744CLQ Production: Released Options Temperature: C Commercial -40 to 85°C Packages: PW 14-Pin Tape & Reel [MOQ 2500pcs] LQ 16-Pin Tape & Reel [MOQ 2500pcs] Technical Support Datasheet: Application Note: Evaluation Board: See Microsemi’s Website See Datasheet LX1744Evaluation Board (LX1744Eval Kit) Factory Contacts SALES KIT Technical Questions: Bruce Ferguson (714) 372-8094 mailto:[email protected] Marketing Manager: Paul Pickle (714) 372-8365 mailto:[email protected] Copyright © 2002 Rev. 1.0 8/22/03 Page 8 New Product Information and Sales Kit
