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LM3495 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3495 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 26 page  LM3495 Emulated Peak Current Mode Buck Controller for Low Output Voltage General Description The LM3495 is a PWM buck regulator which implements a unique emulated peak current mode control. This control method eliminates the switching noise which typically limits current mode operation at extremely short duty cycles and high operating frequency. The switching frequency is pro- grammable between 200 kHz and 1.5 MHz, and can also be synchronized to an external clock. The LM3495 is also very fault tolerant with both switch node short, hiccup mode, and adaptive duty cycle limit protection. A 0.6V 1% reference and glitch free pre-biased start-up ensure the most demanding digital loads operate reliably. Internal soft start and the ability to track the output of another supply make the LM3495 versatile and efficient. Features n Input voltage from 2.9V to 18V n Output voltage adjustable from 0.6V to 5.5V n Feedback Accuracy: ±1% n Low-side Sensing, Programmable Current Limit without sense resistor n Input Under Voltage Lockout n Hiccup mode current limit protection eliminates thermal runaway during fault conditions n Internal soft start with tracking capability n 200 kHz to 1.5 MHz Switching frequency, Synchronizable n On-chip gate drivers n Soft output discharge during shutdown n Startup into output pre-bias n Operation from a single input rail n Adaptive Duty Cycle Limit n TSSOP-16 package Applications n Wide input voltage buck converters with low voltage, high accuracy outputs n Core logic regulators n High-efficiency buck regulation Typical Application 20169901 April 2006 © 2006 National Semiconductor Corporation DS201699 www.national.com |
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