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ADM1051A

Features: Two Independent Controllers on One Chip1.515 V and 1.818 V OutputsShutdown Inputs to Control Each ChannelCompatible with PC Motherboard TYPEDET Signal±2.5% Accuracy Over, Line, Load, and TemperatureLow Quiescent CurrentLow Shutdown CurrentWorks with External N-Channel MOSFETs for Low Cos...

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SeekIC No. : 004275523 Detail

ADM1051A: Features: Two Independent Controllers on One Chip1.515 V and 1.818 V OutputsShutdown Inputs to Control Each ChannelCompatible with PC Motherboard TYPEDET Signal±2.5% Accuracy Over, Line, Load, and T...

ADM1051A Data Sheet

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Part Number:
ADM1051A
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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


Application

Desktop Computers
Servers
Workstations


Pinout

Connection Diagram


Specifications

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


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.




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