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LX1684CD Datasheet(PDF) 1 Page - Microsemi Corporation |
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LX1684CD Datasheet(HTML) 1 Page - Microsemi Corporation |
1 / 12 page Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 Copyright © 2000 Rev. 1.0c, 2005-03-08 LX1684 Voltage-Mode PWM Controller PRODUCTION DATA SHEET TM ® DESCRI PTI O N The LX1684 is a monolithic, voltage- mode pulse-width modulator controller. It is designed to implement a flexible, low cost buck (step-down) regulator supply with a minimal of external components. The LX1684 has a synchronous driver for higher efficiency and is optimized to provide 12V to 3.3V or 12V to 2.5V regulation. It also can be used to convert 5V or 3.3V to voltages as low as 1.25V. Switching frequency is fixed at 175kHz for optimal cost and space. Short-circuit current limiting can be implemented without expensive current sense resistors. Similar to the LX1682 in function but with the positive side of the current sense comparator brought out (CSP) to allow it to be referenced to the topside FET. Current is sensed using the voltage drop across the RDS(ON) of the MOSFET this sensing is delayed for 1µs to eliminate MOSFET ringing errors. Hiccup-mode fault protection reduces average power to the power elements during short-circuit conditions. Under-voltage lockout and soft-start are provided for optimal start-up performance. Pulling the soft-start pin to ground can disable the LX1684. The small 14-pin SOIC packaging, combined with low profile, low ESR capacitors, and TO-252 packaged FETs results in a high efficiency converter in a small board area. In most cases PCB copper can accomplish necessary heat sinking and no bulky additional heat sinks are required. If a low profile design is not required small electrolytic capacitors can be used reducing the overall converter cost. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com KEY FEATUR ES Fixed 175kHz Switching Frequency Constant Frequency Voltage- Mode Control Requires No External Compensation Hiccup-Mode Over-Current Protection High Efficiency Output Voltage Set By Resistor Divider Under-Voltage Lockout Soft-Start And Enable Synchronous Rectification Small, 14-pin Surface Mount Package APPLI CATI ONS 12V to 3.3V Or Less Buck Regulators 3.3/5V to 2.5V Or Less Buck Regulators Hard Disk Drives Computer Add-on Cards PRODUCT H I GHLIGHT - TYPICAL 12V TO 3.3V APPLICATION FB NC SS CSP GND PGND BDR TDR NC VC1 NC CS NC VCC Css 0.1µF R2 100 Ohm R1 165 Ohm C5 1µF 5V 5% RSET 3.3K L1 10µH VOUT Q2 SUB45N05- 20L 4x 1500µF 6.3V 3x 820µF, 16V Q1 SUB45N 05-20L 12V 10% C1 0.1µF 3.3V 10A C3 C4 L1 is a powdered iron toroid 1 2 3 4 5 6 7 14 13 12 11 10 9 8 D1 5817SMT Optional 12V only circuit 5V 12V TO VCC LM78L05 or equivalent PACKAGE ORDER I N FO D Plastic SOIC 14-PIN TA ( °C) OUTPUT RoHS Compliant / Pb-free Transition DC: 0440 0 to 70 Synchronous LX1684CD Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1684CD-TR) |
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