Motherboard Power Supply Solution With A 5-Bit Programmable Switching Controller And Two Linear Regulator Controllers

The LM2637 provides a comprehensive embedded power supply solution for motherboards hosting high performance MPUs such as M II?, Pentium? II, K6-2 and other similar high performance MPUs. The LM2637 incorporates a 5-bit programmable, synchronous buck switching controller and two high-speed linear Regulator controllers in a 24-pin SO package.
Switching Section - The Switching Regulator controller features a 5-bit programmable DAC over-current and over-voltage protection, under-voltage latch-off, a power good signal, and output enable. The 5-bit DAC has a typical tolerance of 1%. There are two user-selectable over-current protection methods. One provides accurate over-current protection with the use of an external sense resistor. The other saves cost by taking advantage of the rDS_ON of the high-side FET The over voltage protection provides two levels of protection. The first level keeps the high-side FET off and the low-side FET on. The second provides a Gate signal that CAN be used to fire an external SCR
Linear Section - The two linear Regulator controllers feature wide control bandwidth, N-FET and NPN Transistor driving capability, and an adjustable output voltage. The wide control bandwidth makes meeting fast load transient response requirement such as that of the GTL+ bus an easy job. In minimum configuration, the two controllers default to 1.5V and 2.5V respectively.
Both linear controllers have under voltage latch-off.
By National Semiconductor Corporation
LM2637 's PackagesLM2637 's pdf datasheet
LM2637M SOIC
LM2637MX SOIC




LM2637 Pinout, Pinouts
LM2637 pinout,Pin out
This is one package pinout of LM2637,If you need more pinouts please download LM2637's pdf datasheet.

LM2637 Application circuits
LM2637 circuits
This is one application circuit of LM2637,If you need more circuits,please download LM2637's pdf datasheet.


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