EUP3419 ds3419 ver1.0 feb. 2010 1 dual 1.5mhz, 1a synchronous step-down converter description the EUP3419 contains two independent 1.5mhz constant frequency, curre nt mode, pwm step-down converters. each converter integrates a main switch and a synchronous rectifier for high efficiency without an external schottky diode. the EUP3419 is ideal for powering portable equipment that runs from a single cell lithium-ion (li+) batte ry. each converter can supply 1a of load current from a 2.5v to 5.5v input voltage. the output voltage can be regulated as low as 0.6v. the EUP3419 can also run at 100% duty cycle for low dropout applications. 25a per channel quiescent current at light loads increases efficiency and battery life. typical application circuit features z 25a quiescent current per channel at light load z up to 96% efficiency z 1.5mhz constant switching frequency z 1a load current on each channel z 2.5v to 5.5v input voltage range z output voltage as low as 0.6v z 100% duty cycle in dropout z short circuit protection z thermal fault protection z <1 a shutdown current z soft start function z 3mm z rohs compliant and 100% lead(pb)-free halogen-free applications z cellular and smart phones z microprocessors and dsp core supplies z pdas and portable media players z wireless and dsl modems z digital still and video cameras figure 1. adjustable voltage regulator
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