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LM2645 - Advanced Two-Phase Switching Controller

General Description

The LM2645 is a feature-rich IC that combines two current mode synchronous buck regulator controllers, an adjustable linear regulator controller and a fixed 3.3V standby output rail.

The two switching regulator controllers operate 180˚ out of phase.

Key Features

  • a fixed 5V output, and the second switching controller controller (Channel 2) features a fixed 3.3V output. Both channels can also be independently adjusted from 1.3 to 5.5V. The adjustable linear regulator can be adjusted from 3.3V to 15V. An internal 5V rail is also available externally for driving bootstrap circuitry. This rail also serves as the input for an internal LDO that provides the fixed 3.3V/50mA output rail. Current-mode feedback control assures excellent line and load regulation an.

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LM2645 Advanced Two-Phase Switching Controller With Two Linear Outputs April 2001 LM2645 Advanced Two-Phase Switching Controller With Two Linear Outputs General Description The LM2645 is a feature-rich IC that combines two current mode synchronous buck regulator controllers, an adjustable linear regulator controller and a fixed 3.3V standby output rail. The two switching regulator controllers operate 180˚ out of phase. This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The two switching regulator outputs can also be paralleled to operate as a dual-phase regulator. The use of synchronous rectification and pulse-skip operation at light load achieves high efficiency over a wide load range.