GENERAL DESCRIPTION
The ADM1051/ADM1051A are dual, precision, voltage regulator controllers intended for power rail generation and active bus termination on personal computer motherboards. They contain a precision 1.2 V bandgap reference and two channels consisting of control amplifiers driving external power devices. Each channel has a shutdown input to turn off amplifier output and Hiccup Mode protection circuitry for the external power device. The shutdown input on the 1.5 V channel can also be used with the TYPEDET signal on a PC motherboard to select the output voltage.

FEATURES
   Two Independent Controllers on One Chip
   1.515 V and 1.818 V Outputs
   Shutdown Inputs to Control Each Channel
   Compatible with PC Motherboard TYPEDET Signal
   ±2.5% Accuracy Over, Line, Load, and Temperature
   Low Quiescent Current
   Low Shutdown Current
   Works with External N-Channel MOSFETs for Low Cost
   “Hiccup Mode” Fault Protection
   No External Voltage or Current Setting Resistors
   1.8 V/3.3 V ICH Sequenced Power-Up on ADM1051A
   Small, 8-Lead SOIC Package

APPLICATIONS
   Desktop Computers
   Servers
   Workstations