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LM2639 Datasheet High Frequency Multi-phase Pwm Controller

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LM2639 5-Bit Programmable, High Frequency Multi-phase PWM Controller February 2000 LM2639 5-Bit Programmable, High Frequency Multi-phase PWM.

General Description

The LM2639 provides an attractive solution for power supplies of high power microprocessors (such as Pentium II™, M II™, K6™-2, K6™-3, etc.) exhibiting ultra fast load transients.

Compared to a conventional single-phase supply, an LM2639 based multi-phase supply distributes the thermal and electrical loading among components in multiple phases and greatly reduces the corresponding stress in each component.

The LM2639 can be programmed to control either a 3-phase converter or a 4-phase converter.

Key Features

  • n n n n n n n n n n n Ultra fast load transient response Enables all surface-mount-design Selectable 2, 3, 4 phase operation Clock frequency from 40 kHz to 10 MHz Precision load current sharing 5-bit programmable from 3.5V to 1.3V VID code compatible to VRM 8.X specification Output voltage is 2.0V for VID code 11111 Selectable internal or external clock Digital 16-step soft start Input under-voltage lock-out, over-current protection.

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