EUP3401 ds3401 ver1.0 sep. 2012 1 2a, 3mhz synchronous step-down dc-dc with i 2 c compatible interface description the EUP3401 is a high-frequency synchronous step-down dc-dc converter optimized for battery- powered portable applications. intended for low-pow er applications, the EUP3401 supports up to 2a load current and allows the use of small, low cost induc tors and capacitors. the device is ideal for mobile phones and similar portable applications powered by a single-cell li-i on battery. with an output voltage range adjustable vi a i 2 c interface from 0.75v to 1.5375v, the device supports low-voltage dsps and processors core power supplies in smart-phones, pdas, and handheld computers. the EUP3401 operates at 3-mhz fixed switching frequency. during light load conditions, the regula tor includes a pfm mode to enhance light-load efficienc y. the regulator transitions smoothly between pwm and pfm modes. in shutdown mode, the current is reduced to less than 200na. the serial interface is compatible with fast/standa rd and high-speed mode i 2 c specification allowing transfers at up to 3.4 mbps. this communication interface is used for dynamic voltage scaling with voltage steps down to 12.5 mv, for reprogramming th e mode of operation (pfm or forced pwm) or disable/ enabling the output voltage. typical application circuit features high efficiency 3mhz constant switching frequency 2a available load current i 2 c compatible interface up to 3.4mbps 43a typical quiescent current 2.7v to 5.5v input voltage range excellent load and line transient response short circuit and thermal protection small size, 1h inductor solution high-efficiency, low ripple, light-load pfm smooth transition between pwm and pfm pin-selectable or i 2 c programmable output voltage available in 3mm3mm tdfn-10 package rohs compliant and 100% lead (pb)-free halogen-free applications pda, pocket pcs cell phones, smart phones smartreflex compliant power supply split supply dsps and p solutions omap, xscale digital cameras micro dc-dc converter modules figure 1.
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