XC9235/XC9236/XC9237 Series
ETR05014-017a
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
■GENERAL ...
XC9235/XC9236/XC9237 Series
ETR05014-017a
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
■GENERAL DESCRIPTION
☆Green Operation Compatible
The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC ☆coGnvreeertneOrspweritahtiaonbuCilot-minp0a.4tib2Ωle Pchannel MOS driver
transistor and 0.52Ω N-channel MOS switching
transistor, designed to allow the use of ceramic capacitors. Operating voltage range is from 2.0V to 6.0V (A~C types), 1.8V to 6.0V (D~G types). For the D/F types which have a reference voltage of 0.8V (accuracy:±2.0%), the output voltage can be set from 0.9V by using two external resistors. The A/B/C/E/G types
have a fixed output voltage from 0.8V to 4.0V in increments of 0.05V (accuracy:±2.0%). The device provides a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected externally. With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected for suiting to your particular application. As for operation
mode, the XC9235 series is PWM control, the XC9236 series is automatic PWM/PFM switching control and the XC9237 series can be manually switched between the PWM control mode and the automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load).
The soft start and current control functions are internally optimized. During stand-by, all cir...