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

The ISL6421A is a highly integrated solution for providing power and control signals from advanced satellite set-top box (STB) modules to the low noise block (LNB). The internal architecture of this device contains a current-mode boost PWM and a low-noise linear regulator, along with the circuitry required for I2C device interfacing and for providing DiSEqC™ standard control signals to the LNB. A regulated output voltage is available at the output terminal (VOUT) to support the operation of the antenna port in advanced satellite STB applications. The regulated output may be set to either 13V or 18V by use of the voltage select command bit (VSEL) through the I2C bus. Additionally, to compensate for the voltage drop in the coaxial cable, the voltage may be increased by 1V with the line length compensation bit (LLC) feature. The device can be put into a standby mode by means of the enable bit (EN), this disables the PWM and Linear regulator combination and helps conserve power. The input to the linear regulator is derived from the current mode boost converter, such that the required voltage is the sum of the output voltage and the linear regulator drop (1. 0V typical). This ensures that the power dissipation is minimized and maintains a constant voltage drop across the linear pass element, while permitting an adequate voltage range for tone injection. The device is capable of providing 450mA (typical). The overcurrent limit is either digitally or resistor programmable.

Features

  • Switch-Mode Power Converter for Lowest Dissipation
  • Boost PWM with >92% Efficiency
  • Selectable 13V or 18V Outputs
  • Digital Cable Length Compensation (1V)
  • Vsw tracks Vout ensures low dissipation
  • I2C Compatible Interface for Remote Device Control
  • Registered Slave Address 0001 00XX
  • Fully Functional 3.3V, 5V Operation up to 400kHz
  • Built-In Tone Oscillator Factory Trimmed to 22kHz
  • Facilitates DiSEqC™ (EUTELSAT) Encoding
  • External Modulation input DSQIN
  • Internal Over Temperature Protection and Diagnostics
  • Internal Overload and Over Temperature Flags (Visible on I2C)
  • Output Back-Bias Protection to 24V
  • LNB Short-Circuit Protection and Diagnostics
  • QFN Package
  • Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline
  • Near Chip-Scale Package Footprint
  • External Pins to Select 13V/18V Options
  • Pb-Free Available (RoHS Compliant)

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 QFN Tube 60
Availability
Active QFN Reel 6000
Availability

Documentation

Title language Type Format File Size Date
Datasheets & Errata
ISL6421A Datasheet Datasheet PDF 692 KB
Application Notes & White Papers
AN1161: ISL6421A Single LNB Controller with I2C Interface for Advanced Satellite Set-Top Box Designs Application Note PDF 1.46 MB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
PCNs & PDNs
PCN20029A - Alternate bond wire material and assembly facility of the listed Renesas QFN packaged products Product Change Notice PDF 327 KB
PCN15046 - Wafer Fabrication Site Change for Listed Intersil Products - Global Foundry P6 Process transfer to Palm Bay - Phase II Product Change Notice PDF 398 KB
PCN13025 - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products - Advanced Semiconductor Engineering (ASECL) - Chung-Li , Taiwan and STATS ChipPAC (SCM) - Kuala Lumpur, Mal Product Change Notice PDF 106 KB
PCN13009 - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products - Advanced Semiconductor Engineering (ASECL) - Chung-Li (ASECL), Taiwan and STATS ChipPAC (SCM) - Kuala Lump Product Change Notice PDF 173 KB
PCN10055 - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products - STATS ChipPAC Malaysia Product Change Notice PDF 248 KB
Other
ISL6405I2C-KIT-EVAL Driver v2.0 Library EXE 408 KB
ISLUSBI2CKIT1Z Driver Software v3.1.6 Library EXE 2.64 MB

Downloads

Title language Type Format File Size Date
Software
ISL6405I2C-KIT-EVAL Driver v2.0 Library EXE 408 KB
ISLUSBI2CKIT1Z Driver Software v3.1.6 Library EXE 2.64 MB