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.

Features

  • 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

Applications

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

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active TQFN Tube 75
Availability
Active TQFN Reel 6000
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL9492 Datasheet Datasheet PDF 1.33 MB
User Guides & Manuals
ISL9492 User Guide Manual PDF 851 KB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
PCNs & PDNs
PCN13060 - Test Site Change for the Listed Intersil Products Product Change Notice PDF 223 KB
PCN12056 - Alternate Manufacturing Site for Assembly of the Listed Intersil QFN Packaged Products - Advanced Semiconductor Engineering - Chung-Li, Taiwan (ASECL) Product Change Notice PDF 82 KB
PCN12032A - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products - Carsem (CAS) Ipoh, Malaysia Product Change Notice PDF 171 KB
PCN12032 - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products -Carsem (CAS) Ipoh, Malaysia Product Change Notice PDF 164 KB
Other
ISLUSBI2C Driver Installer Library EXE 614 KB
ISL9492 Evaluation Board Installer v1.0 Library EXE 2.84 MB
ISLUSBI2CKIT1Z Driver Software v3.1.6 Library EXE 2.64 MB
PA14042 - Minimum Line Quantity Change Product Advisory PDF 363 KB