LX1676
TM ®
Mobile AMD Athlon™ VRM Controller
P RODUCTION D ATA S HEET
DESCRIPTION
KEY FEATURES High Current Biphas...
LX1676
TM ®
Mobile AMD Athlon™ VRM Controller
P RODUCTION D ATA S HEET
DESCRIPTION
KEY FEATURES High Current Biphase Operation Outputs As Low As 0.925V † Biphase LoadSHARETM † 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
APPLICATIONS
The LX1676 is a highly integrated VRM power supply controller IC featuring two PWM switching www.DataSheet4U.net 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 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. This architecture also minimizes capacitor requirements while
maximizing regulator response. A true differential input amplifier is used for remote
voltage sensing at th...