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Part Number: ADM1051A
Description: The ADM1051/ADM1051A are dual, precision, voltage regulator controllers intended for power rail genera...
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ADM1051A
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DataSheet
General Description
ADM1051A 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.
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.
ADM1051A Maximum Ratings
VCC to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 V
SENSE 1, SENSE 2 to GND . . . . . . . . . . . 0.3 V to +5.5 V
FORCE 1, FORCE 2 . . . . . . . Short-Circuit to GND or VCC
Continuous Power Dissipation (TA = 70°C) . . . . . . 650 mW
8-Lead SOIC (Derate 8.3 mW/°C Above 70°C)
Operating Temperature Range
Commercial (J Version) . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage Temperature Range . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . .300°C
SENSE 1, SENSE 2 to GND . . . . . . . . . . . 0.3 V to +5.5 V
FORCE 1, FORCE 2 . . . . . . . Short-Circuit to GND or VCC
Continuous Power Dissipation (TA = 70°C) . . . . . . 650 mW
8-Lead SOIC (Derate 8.3 mW/°C Above 70°C)
Operating Temperature Range
Commercial (J Version) . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage Temperature Range . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . .300°C
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
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
ADM1051A Typical Application
Desktop Computers
Servers
Workstations
Servers
Workstations
ADM1051A Connection Diagram
ADM1051A
PDF/DataSheet Download
- Datasheet: ADM1051A
- File Size: 180441 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
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