NOTICE - The following device(s) are recommended alternatives:

The ISL9492 is a highly integrated voltage regulator and interface IC specifically designed for supplying power and control signals from advanced satellite set-top box (STB) modules to the low noise blocks (LNB) of a single antenna port. It also supports DiSEqC tone generation and modulation with diagnostic status read-back. Controlling the ISL9492 is simple via the I2C bus by writing 8 bit words onto the System Registers (SR). The device design makes the total LNB supply design simple, efficient and compact with low external component count by integrating Boost power MOSFET, current-mode boost PWM and a low-noise linear regulator. The current-mode boost converters provide the linear regulator with input voltage that is set to the final output voltages, plus typically 0.9V to insure minimum power dissipation across each linear regulator. The LNB output voltage can be controlled in two ways; by full control from I2C using the VTOP and VBOT bits or by setting the I2C to the lower range and switching to higher range with the select VTOP pin. The External modulation input EXTM accepts a modulated DISEqC command and transfers it symmetrically to the output. The EXTM pin can be used to modulate the continuous internal tone. The fault signal serves as an interrupt for the processor when any condition turns OFF the LNB controller (over-temperature, overcurrent, disable). The states of these flags to the faults can be thoroughly examined through the I2C registers.


  • Single-Chip Power Solution
  • Operation for 1-Tuner/1-Dish Applications
  • Integrated DC/DC Converter and I2C Interface
  • Integrated Boost MOSFET
  • Switch-Mode Power Converter for Lowest Dissipation
  • 490kHz Boost Switching Frequency
  • Boost PWMs with > 92% Efficiency
  • Selectable 13.5V or 18.5V Outputs
  • I2C and Pin Controllable Output
  • 31V Output Back-Bias Capability
  • Built-in Tone Oscillator Factory
  • Facilitates DiSEqC (EUTELSAT) Encoding
  • Trimmed to 22kHz - External Modulation Input
  • DiSEqC 2.0 Support and Diagnostics
  • Internal Overvoltage, Undervoltage, Overcurrent Protection, Over-Temperature Flags Accessible through the I2C Interface and Fault Signal Status Pin
  • Short-Circuit Protection


  • LNB Power Supply and Control for Satellite Set-Top Box


製品名 Part Status Pkg. Type Carrier Type MOQ 購入/サンプル
Active TQFN Tube 75
Active TQFN Reel 6000


タイトル language 分類 形式 サイズ 日付
star ISL9492 Datasheet データシート PDF 1.33 MB
ISL9492 User Guide マニュアル-開発ツール PDF 851 KB
Five Easy Steps to Create a Multi-Load Power Solution ホワイトペーパー PDF 846 KB
AN1681: Grounding Techniques アプリケーションノート PDF 509 KB
AN1684: Nonideality of Ground アプリケーションノート PDF 397 KB
PA14042 - Minimum Line Quantity Change Product Advisory PDF 363 KB
PCN13060 - Test Site Change for the Listed Intersil Products 製品変更通知 PDF 223 KB
PCN12056 - Alternate Manufacturing Site for Assembly of the Listed Intersil QFN Packaged Products - Advanced Semiconductor Engineering - Chung-Li, Taiwan (ASECL) 製品変更通知 PDF 82 KB
PCN12032 - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products -Carsem (CAS) Ipoh, Malaysia 製品変更通知 PDF 164 KB
PCN12032A - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products - Carsem (CAS) Ipoh, Malaysia 製品変更通知 PDF 171 KB


タイトル language 分類 形式 サイズ 日付
ISL9492 Evaluation Board Installer v1.0 ライブラリ EXE 2.84 MB
ISLUSBI2C Driver Installer ライブラリ EXE 614 KB
ISLUSBI2CKIT1Z Driver Software v3.1.6 ライブラリ EXE 2.64 MB