Intersil – ISL95338: Bidirectional, Buck-Boost Voltage Regulator

The ISL95338 is a bidirectional, buck-boost voltage regulator, which provides buck-boost voltage regulation and protection features. Intersil’s advanced R3™ technology is used to provide high light-load efficiency, fast transient response, and seamless DCM/CCM transitions.

The ISL95338 takes input power from a wide range of DC power sources (conventional AC/DC ADPs, USB PD ports, travel ADPs, etc.) and safely converts it to a regulated voltage up to 24V. The ISL95338 can also convert a wide range DC power source connected at its output (system side) to a regulated voltage to its input (ADP side). This bidirectional buck-boost regulation feature makes its application very flexible.

ISL95338 includes various system operation functionalities such as Forward mode enable, Reverse mode enable, programmable soft-start time, adjustable VOUT, in both forward direction and reverse direction. The protection functionalities
include OCP, OVP, UVP, OTP, etc.

The ISL95338 has serial communication via SMBus/I2C that allows programming of many critical parameters, to deliver a customized
solution. These programming parameters include, but are not limited to: output current limit, input current limit, and output voltage setting.

The ISL95338 is available in compact RoHS compliant 32 Ld 4 x 4 TQFN package.


  • Bidirectional buck, boost, and buck-boost operation
  • Input voltage range 3.8V to 24V (no dead zone)
  • Output voltage up to 20V
  • Up to 1MHz switching frequency
  • Programmable soft-start time
  • LDO output for VDD and VDDP
  • System status alert function
  • Bidirectional internal discharge function
  • Active switching for negative voltage transitions
  • Bypass mode in both directions
  • Forward mode enable, reverse mode enable
  • OCP, OVP, UVP, and OTP protection
  • SMBus and auto-increment I2C compatible


  • Storage/Flash drives
  • Power banks
  • Other portable consumer devices