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EL7556AC

Elantec Semiconductor
Part Number EL7556AC
Manufacturer Elantec Semiconductor
Description Programmable CPU Power Supply Unit
Published Jul 10, 2007
Detailed Description EL7556AC EL7556AC Programmable CPU Power Supply Unit Features • EL7556C Pin Compatible • Improved Temperature and Volt...
Datasheet PDF File EL7556AC PDF File

EL7556AC
EL7556AC

Overview
EL7556AC EL7556AC Programmable CPU Power Supply Unit Features • EL7556C Pin Compatible • Improved Temperature and Voltage Ranges • 6A Continuous Load Current • Precision Internal 1% Reference • 1.
0V to 3.
8V Output Voltage • Internal Power MOSFETs • >90% Efficiency • Synchronous Switching • Adjustable Slope Compensation • Over Temperature Indicator • Pulse by Pulse Current Limiting • Operates up to 1MHz • 1.
5% Typical Output Accuracy • Adjustable Oscillator w/Sync • Remote Enable/Disable • Intel P54 and P55 Compatible • VCC2DET Interface www.
DataSheet4U.
com • Internal Soft Start General Description The EL7556AC is an adjustable synchronous DC:DC switching regulator optimized for a 5V input and 1.
0-3.
8V output.
By combining integrated NMOS power FETS with a fused-lead package the EL7556AC can supply up to 6A continuous output current without the use of external power devices or discrete heat sinks, thereby minimizing design effort and overall system cost.
On chip resistorless current sensing is used to achieve stable, highly efficient, current-mode control.
The EL7556AC also incorporates the VCC2DET function to directly interface with the Intel P54 and P55 microprocessors.
Depending on the state of VCC2DET the output voltage is internally preset to 3.
50V or a user adjustable voltage using two external resistors.
In both internal and external feedback modes the active-high PWRGD output indicates when the regulator output is within ±10% of the programmed voltage.
An on-board sensor monitors die temperature (OT) for over-temperature conditions and can be connected directly to OUTEN to provide automatic thermal shutdown.
Adjustable oscillator frequency and slope compensation allow added flexibility in overall system design.
Applications • • • • • • PC Motherboards Local high power CPU supplies 5V to 1.
0V DC-DC Conversion Portable Electronics/Instruments P54 and P55 Regulators GTL+ Bus Power Supply Connection Diagram R4 R3 100Ω 150Ω VIN D3 1 C4 0.
1µF 2 C7 150pF 3 ...


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