EUP3425 ds3425 ver0.1 mar. 2010 1 5a, 1mhz synchronous step-down converter description the EUP3425 is a 1mhz fixed frequency synchronous, current-mode, step-down dc-dc converter capable of providing up to 5a output current. the EUP3425 operates from an input range of 2.7v to 5.5v and provides a regulated output voltage from 0.8v to 5v. the internal synchronous power switch increases efficiency and eliminates the need for an external schottky diode. the EUP3425 can be externally set for either forced pwm continuous mode or pulse skipping mode. forced pwm operation provides very low output ripple voltage for noise sensitive applications while pulse skipping operation improves light load efficiency by reducing switching loss. the EUP3425 features short circuit and thermal protection circuits to increase system reliability. externally adjustable soft-s tart ss pin allows for proper power on sequencing with respect to other power supllies and avoids input inrush current during startup. the EUP3425 is available in a low profile 14pin 3mm 4mm tdfn package . typical application circuit features z 2.7v to 5.5v input voltage range z high efficiency up to 96% z 5a available load current z 35m ? integrated fet switches z 1mhz switching frequency z 100% duty cycle low dropout opetion z short circuit and thermal protection z integrated uvlo and power good z excellent line and load transient response z adjustable soft-start with an external capacitor z adjustable output voltage down to 0.8v z available in 14pin 3mm 4mm tdfn package z rohs compliant and 100% lead(pb)-free halogen-free applications z distributed 3.3v and 5v power supplies z high performance dsps, fpgas, asics and microprocessors z base station, telecom, and networking equipment power supplies z epc and netpcs figure1. adjustable output regulator
EUP3425 ds3425 ver0.1 mar. 2010 2 typical application circuit (continued) figure2. fixed output regulator block diagram figure3. block diagram
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