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 GENERAL DESCRIPTION
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. The ADM1051/ADM1051A operate from a 12 V supply, which gives sufficient headroom for the amplifiers to drive external N-channel MOSFETs, operating as source-followers, as the external series pass devices. This has the advantage that Nchannel devices are cheaper than P-channel devices of similar performance, and the circuit is easier to stabilize than one using P-channel devices in a common-source configuration.
Analog Devices
