PW2058代理商，PW2058恒压电流模式降压IC

generaldescription

the pw2058/pw2059 is a constant frequency, current modestep-down converter. the device integrates a main switch and asynchronous rectifier for high efficiency without an externalschottky diode. it is ideal for powering portable e thatruns from a single cell lithium-ion (li+) battery. the outputvoltage can be regulated as low as 0.6v. the pw2058/pw2059 can alsorun at 100,% duty cycle for low dropout operation, extendingbattery life in portable system. this device offers two operationmodes, pwm control and pfm mode switching control, which allows ahigh efficiency over the wider range of the load.

features

l  high efficiency: up to 96%

l  1.5mhz constant frequencyoperation

l  800ma output current

l  no schottky diode required

l  2v to 6v input voltage range

l  output voltage as low as 0.6v

l  pfm mode for high efficiency inlight load

l  100,% duty cycle in dropoutoperation

l  low current: 20μa

l  slope compensated current modecontrol for excellent line and load transient response

l  short circuit protection

l  thermal fault protection

l  inrush current limit and softstart

l  <1μa shutdown current

l  sot23-5 package

applications

l  cellular and smart phones

l  wireless and dsl modems

l  pdas

l  portable instruments

l  digital still and video cameras

l  dtv

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