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