LM3495 Datasheet | National Semiconductor

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 programmable between 200 k Hz 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 n n n n n n n n n n n n n Input voltage from 2.9V to 18V Output voltage adjustable from 0.6V to 5.5V Feedback Accuracy: ± 1% Low-side Sensing, Programmable Current Limit without sense resistor Input Under Voltage Lockout Hiccup mode current limit protection eliminates thermal runaway during fault conditions Internal soft start with tracking capability 200 k Hz to 1.5 MHz Switching frequency, Synchronizable On-chip gate drivers Soft output discharge during shutdown Startup into output pre-bias Operation from a single input rail Adaptive Duty Cycle Limit 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 © 2006 National Semiconductor Corporation DS201699 .national. Connection Diagram TOP VIEW 16-Lead Plastic TSSOP θJA = 155˚C/W Ordering Information Part Number LM3495MTC LM3495MTCX NSC Package Drawing MTC16 MTC16 Supplied As 92 Units Per Rail 2.5k Units Per Reel TRACK (Pin 9): Tracking pin. To force the output of the LM3495 to track another power supply, connect a resistor divider (smaller than 10 kΩ for better precision) from the output of the other supply directly...