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ADM1051A bảng dữ liệu(PDF) 1 Page - Analog Devices |
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ADM1051A bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 10 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADM1051/ADM1051A One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 Precision Dual Voltage Regulator Controllers FUNCTIONAL BLOCK DIAGRAM SHDN1 VCC 50 A BANDGAP REFERENCE HICCUP COMPARATOR 100 F 2 100 F VOUT1 CONTROL AMPLIFIER FORCE 1 SENSE 1 ADM1051/ADM1051A SHDN2 HICCUP COMPARATOR GND VCC VIN 3.3V CONTROL AMPLIFIER FORCE 2 SENSE 2 VCC SHUTDOWN CONTROL 100 F 2 100 F VOUT2 VIN 3.3V SHUTDOWN CONTROL VCC 50 A CLK/DELAY GENERATOR POWER-ON RESET CLOCK OSCILLATOR NO CONNECTION ON ADM1051A 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 ADM1051/ADM1051A are dual, precision, voltage regula- tor 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. 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 N- channel 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. |
Số phần tương tự - ADM1051A_15 |
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Mô tả tương tự - ADM1051A_15 |
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