LX1677

Product Summary

The LX1677 is a kind ofa highly integrated VRM power supply controller IC featuring two PWM switching regulator stages. The two constant frequency voltage-mode PWM phases of LX1677CLQ are configured as a single biphase high current output core supply. In biphase operation, the high current (>35A) output of LX1677CLQ 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 of LX1677CLQ provides exceptional 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. The typical applications of LX1681CDM include: (1)AMD Athlon 64 and AMD Opteron Processors; (2)Processor Core Voltage Supply; (3)Voltage Regulator Modules.

Parametrics

LX1677 absolute maximum ratings: (1)Supply Input Voltage (VCCL, VCC): -0.3V to 6.0V; (2)Battery Input Voltage (VIN): -0.3V to 24V; (3)Current Limit Sense (ILIM1, ILIM3): -0.3V to 30V; (4)Topside Driver Supply Input Voltage (VC1, VC2, VC3): -0.3 to VSx + 6.0V; (5)Topside Driver Return Input Voltage (VS1, VS2): -5V to 24V; (6)Differential Sense Input Voltage (FB+, FB-): -0.3V to 6.0V; (7)VID0 – VID4, Input Voltage: -0.3V to 6V; (8)High Side Driver Peak (<500ns) Current (HO1/2, I-MAX): +1A; (9)Low Side Driver Peak (<500ns) Sink Current (LO1/2, I-MIN): +1.5A; (10)Operating Junction Temperature: 150℃; (11)Storage Temperature Range: -65℃ to 150℃; (12)Lead Temperature (Soldering 10 seconds): 300℃; (13)RoHS Peak Package Solder Reflow Temperature (40 second maximum exposure): 260℃ (+0, -5).

Features

LX1677 features: (1)High Current Biphase Operation; (2)Outputs As Low As 0.800V; (3)Biphase LoadSHARETM; (4)Transient Correction Loop Reduces Required Capacitance; (5)Differential Amplifier For Remote Voltage Sensing; (6)Integrated High Current MOSFET Drivers; (7)200KHz to 1MHz Frequency Operation; (8)Programmable Slew Rate Control For Start-Up Sequence and VID change; (9)VID Changes On The Fly; (10)Power Good Indicator; (11)Short Circuit Protection; (12)Output Over Voltage and Under Voltage Protection; (13)No current-sense resistors.

Diagrams