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LX1676 Datasheet(PDF) 1 Page - Microsemi Corporation |
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LX1676 Datasheet(HTML) 1 Page - Microsemi Corporation |
1 / 16 page LX1676 PRODUCTION DATA SHEET Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 Mobile AMD Athlon ™ VRM Controller Copyright © 2000 Revision: 1.0, 4/12/2005 TM ® DESCRI PTI O N The LX1676 is a highly integrated VRM power supply controller IC featuring two PWM switching regulator stages. The two constant frequency voltage-mode PWM phases are configured as a single biphase high current output core supply. In biphase operation, the high current (>25A) output is generated by a LoadSHARETM† technique that balances the currents in the two phases. Power loss and noise, due to the ESR of the input capacitors, are minimized by operating the PWMs 180° out of phase. A synchronized Transient Correction Loop† provides except- ional control of the output droop and overshoot during very high di/dt load changes, the circuit can be configured for droop only, overshoot only or both. This architecture also minimizes capacitor requirements while maximizing regulator response. A true differential input amplifier is used for remote voltage sensing at the processor core. A VID code generator provides an internal reference that will set the output voltage. This VID code can be changed during operation and the reference will slew the output voltage to its new setting at a preset rate. During VID changes on the fly the Power Good indication will stay valid. Current through the lower phase 1 MOSFET will be sampled using its RDS(ON) for current limit and shut down. For further protection, an over voltage circuit will trip at a specified setting and clamp the output by turning off the upper MOSFETs and turning on the lower MOSFETs. The upper MOSFET drivers will use a bootstrap capacitor to provide the upper drive voltage over the input voltage range of 6 to 24 volts. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com † Patent numbers US6292378,US6285571,US6356063, US6605931 KEY FEATUR ES High Current Biphase Operation Outputs As Low As 0.925V † Biphase LoadSHARE TM † Transient Correction Loop Reduces Required Capacitance Differential Amplifier For Remote Voltage Sensing Integrated High Current MOSFET Drivers 200KHz to 1MHz Frequency Operation Programmable Slew Rate Control For Start-Up Sequence and VID change VID Changes On The Fly Power Good Indicator Short Circuit Protection Output Over Voltage and Under Voltage Protection No current-sense resistors APPLI C ATION S AMD Mobile Athlon ™ or Duron ™ Processor Core Voltage Supply Voltage Regulator Modules PRODUCT H I GHLIGHT L X 16 76 5 B i t V I D 70n H Tr a n s i e n t C o r r e c t i on Loop Vi n 6 t o 2 4 V Vi n 6 t o 2 4 V V out Vi n + 5 V PACKAGE ORDER I N FO PW Plastic TSSOP 38-Pin LQ Plastic MLPQ 38-Pin TJ ( °C) RoHS Compliant / Pb-free Transition DC: 0518 RoHS Compliant / Pb-free Transition DC: 0512 0 to 70 LX1676CPW LX1676CLQ Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1676CLQ-TR) |
Similar Part No. - LX1676_05 |
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Similar Description - LX1676_05 |
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