pfm step-down dc-dc
controller
description
the utc m7085 step-down dc-dc controller is optimized for
use with a power pmosfet. it utilize a pulse-frequency
modulation (pfm) control scheme that implies high efficiency
operation at light loads.
there are two user-selectable over-current protection methods
one provides over-current protection by taking advantage of the
rds(on) of the p- channel. the other provides accurate over-current
protection with the use of an external sense resistor. the
cycle-by-cycle current limit threshold can be adjusted with a
external resistor.
features
* high efficiency 90% and up is possible
* low dropout operation：100% duty cycle
* maximum operating frequency > 1mhz
* two methods of over-current protection
* 4.5v ~ 35v wide input range
* 1.24v ~ vin adjustable output range