LM2636MX/NOPB

DC DC Cntrlr Single-OUT Sync Buck 4.5V to 5.5V Input 20Pin SOIC W T/R

DESCRIPON

The LM2636 is a high speed controller designed specifically for use in synchronous DC/DC buck converters for advance d microprocessors. A 5-bit DAC accepts the VID code directly from the CPU and adjusts the output voltage from 1.3V to 3.5V. It provides the power good, over-voltage protection, and output enable features as required by Intel VRM specifications. Current limiting is achieved by monitoring the voltage drop across the rDS_ON of the high side MOSFET, which eliminates an expensive current sense resistor.

FEATURES

• 1.3V to 3.5V 5-Bit Programmable Output Voltage

• Synchronous Rectification

• Power Good Flag and Output Enable

• Over-Voltage Protection

• Initial Output Accuracy: 1.5% Over Temperature

• Current Limit without External Sense Resistor

• Adaptive Non-Overlapping MOSFET Gate Drives

• Adjustable Switching Frequency: 50 kHz to 1 MHz

• Dynamic Output Voltage Positioning

• 1.256V Reference Voltage Available Externally

• Plastic SOIC-20 Package and TSSOP-20 Package

APPLICATIONS

• Motherboard Power Supply/VRM for Cyrix Gxm, Cyrix Gxi, Cyrix MII, Pentium II, Pentium Pro, 6x86 and K6 Processors

• 5V to 1.3V–3.5V High Current Power Supplies