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| EUP3485 ds3485 ver1.2 mar. 2011 1 4a, 21v, 500khz synchronous step-down converter description the EUP3485 is a 500khz fixed frequency synchronous current mode buck regulator. the device integrates both 110m high-side switch and 30m low-side switch that provide 4a of continuous load current over a wide operating input voltage of 4.5v to 21v. the internal synchronous power switch increase s efficiency and eliminates the need for an external schottky diode. current mode control provides fast transient response and cycle-by-cycle current limit . the EUP3485 features short circuit and thermal protection circuits to increase system reliability. in shutdown mode, the supply current drops below 1 a. the EUP3485 is available in sop-8 package with an exposed pad. typical application circuit features 4a continuous output current 100ns minimum on time integrated 110m high-side switch integrated 30m low-side switch wide 4.5v to 21v operating input range output adjustable from 0.8v fixed 500khz switching frequency sync from 300khz to 2mhz external clock internal compensation internal soft-start <1 a shutdown current thermal shutdown and over current protection input under voltage lockout available in sop-8 (ep) package rohs compliant and 100% lead(pb)-free halogen-free applications distributed power systems networking systems notebook systems and i/o power flat panel television and monitors personal video recorders digital set top boxes figure 1.
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