LX1676

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


Application

  AMD Mobile Athlon™ orDuron™ Processor Core Voltage Supply
  Voltage Regulator Modules


Pinout




Specifications

Supply Input Voltage (VCCL, VCC)................................................-0.3V to 6.0V
Battery Input Voltage (VIN) ..............................................................-0.3V to 36V
Current Limit Sense (ILIM1, ILIM3) ................................................-0.3V to 36V
Topside Driver Supply Input Voltage (VC1, VC2, VC3)........-0.3 toVSx + 6.0V
Topside Driver Return Input Voltage (VS1, VS2)................................-5V to 36V
Differential Sense Input Voltage (FB+, FB-)....................................-0.3V to 6.0V
VID0  VID4, Input Voltage ...............................................................-0.3V to 6V
High Side Driver Peak (<500ns) Current (HO1/2, I-MAX) ............................+1A
Low Side Driver Peak (<500ns) Sink Current (LO1/2, I-MIN)....................+1.5A
Operating Junction Temperature.................................................................. 150°C
Storage Temperature Range...........................................................-65°C to 150°C
Lead Temperature (Soldering 10 seconds) .................................................. 300°C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
x denotes respective pin designator 1, 2, or 3

Description

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.