LIN D O C #: 1660
LX1660/1661
A DVANCED PWM CONTROLLER
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LIN D O C #: 1660
LX1660/1661
A DVANCED PWM CONTROLLER
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DESCRIPTION The LX1660 and LX1661 Are Monolithic Switching
Regulator Controller ICs designed to provide low-cost, highperformance adjustable power supply for microprocessors and other applications requiring a fast transient response and a high degree of accuracy. They provide an adjustable synchronous Pulse Width Modulator output suitable for a power supply for PentiumĀ® or other microprocessors. Synchronous Rectifier Driver For CPU Core. The devices can drive dual MOSFETs resulting in typical efficiencies of 85 - 90%, even with loads in excess of 10A. Synchronous shutdown results in increased efficiency in light load applications. Short-Cir cuit Current Limiting Without Expensive Current Sense Resistors. The current sensing mechanism can use a PCB trace resistance or the parasitic resistance of the main inductor. For applications requiring a high degree of accuracy, a conventional sense resistor can be used. Hiccup Mode Fault Protection. The hiccup mode is programmable and with pulse-by-pulse current limiting will help protect the power supply system and load in the even of a short circuit. Ultra-Fast Transient Response Reduces System Cost. The fixed frequency modulated off-time architecture results in the fastest transient response for a given inductor. Adaptive voltage positioning (LX1661 only) requires fewer low-...