EUP3292 ds3292 ver1.0 mar. 2013 1 dual 1a, 2.25mhz synchronous step-down dc/dc regulator description the EUP3292 is synchronous dual step-down dc-dc converters optimized for battery powered portable applications. it provides two independent output vo ltage rails powered by 1-cell li-ion or 3-cell nimh/nicd batteries. the device is also suitable to operate f rom a standard 3.3v or 5v voltage rail. with an input voltage range of 2.7v to 5.5v, the EUP3292 is ideal to power portable applications lik e smart phones, pdas and other portable equipment. the EUP3292 operates at 2.25mhz fixed switching frequency allowing the use of small inductors and capacitors to achieve a small solution size. each o utput supports up to 1a load current, typical. the intern al synchronous switch increases efficiency and elimina tes the need for an external schottky diode. automatic switching between pwm low-noise and pfm low-current operation increases efficiency at l ight loads, further extending battery life. the EUP3292 has internal soft start and avoids inru sh current during startup. typical application circuit features high efficiency up to 95% 2.25mhz constant switching frequency 1a available load current on each channel 30a typical quiescent current on each input 2.7v to 5.5v input voltage range adjustable output voltage as low as 0.6v no schottky diode required short circuit and thermal protection internal soft start function automatic pfm/pwm mode switching available in 3mm 3mm tdfn-12 package rohs compliant and 100% lead(pb)-free halogen-free applications ssd module smart phones tablet pc plug-in dc/dc modules for routers and switchers figure 1.
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