The ISL9440xEVAL1Z evaluation boards are used to evaluate the performance of the ISL9440A, ISL9440B and ISL9440C quad-output synchronous buck controllers.

The ISL9440A, ISL9440B and ISL9440C are quad-output controllers that integrate three PWM synchronous buck controllers and one low-dropout linear regulator controller. The ISL9440A offers internal soft-start, independent enable functions and integrates UV/OV/OC/OT protections. While the ISL9440B and ISL9440C offer programmable soft-start, independent enable functions and integrate OV/OC/OT protections. All three devices offer current mode control architecture and an internal compensation network, keeping peripheral component count minimal.


  • DC/DC, step-down with LDO
  • Current - output: 6A, 6A, 4A, 800mA
  • Switching frequency (ISL9440A and ISL9440C): 600kHz
  • Switching frequency (ISL9440B): 300kHz
  • Soft-start timing (ISL9440A): 1.7ms
  • Soft-start timing (ISL9440B and ISL9440C): Programmable
  • Voltage - input: 6V to 16V


  • Satellite and cable set-top boxes
  • Cable modems
  • VoX gateway devices
  • NAS/SAN devices
  • ATX power supply (ISL9440B and ISL9440C)

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL9440B, ISL9440C Datasheet Datasheet PDF 2.17 MB
ISL9440, ISL9440A, ISL9441 Datasheet 日本語 Datasheet PDF 1.52 MB
User Guides & Manuals
ISL9440CEVAL1Z User Guide Guide PDF 1.39 MB
ISL9440AEVAL1Z User Guide Manual PDF 1.32 MB
ISL9440BEVAL1Z User Guide Manual PDF 1.23 MB
ISL9440EVAL2Z User Guide Manual PDF 1.22 MB
ISL9440EVAL2Z Design Files Design File ZIP 349 KB
ISL9440xEVAL1Z Design Files Design File ZIP 274 KB