DATASHEET ISL6405 FN9026 Rev 2.00 Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Jul 2004 Advanced Satellite Set-Top Box Designs The ISL6405 is a highly integrated voltage regulator and Features interface IC, specifically designed for supplying power and Single Chip Power solution control signals from advanced satellite set-top box (STB) - True Dual Operation for 2-Tuner/2-Dish Applications modules to the low noise blocks (LNBs) of two antenna - Both Outputs May be Enabled Simultaneously at ports. The device is composed of two independent Maximum Power current-mode boost PWMs and two low-noise linear 2 - Integrated DC-DC Converter and I C Interface regulators along with the circuitry required for 22kHz tone 2 Switch-Mode Power Converter for Lowest Dissipation generation, modulation and I C device interface. The device - Boost PWMs with > 92% Efficiency makes the total LNB supply design simple, efficient and - Selectable 13V or 18V Outputs compact with low external component count. - Digital Cable Length Compensation (1V) Two independent current-mode boost converters provide the 2 I C Compatible Interface for Remote Device Control linear regulators with input voltages that are set to the final - Registered Slave Address 0001 00XX output voltages, plus typically 1.2V to insure minimum power - Full 3.3V/5V Operation up to 400kHz dissipation across each linear regulator. This maintains constant voltage drops across each linear pass element External Pins to Select 13V/18V Options while permitting adequate voltage range for tone injection. - Available with QFN Package Only Built-In Tone Oscillator Factory Trimmed to 22kHz The final regulated output voltages are available at two TM - Facilitates DiSEqC (EUTELSAT) Encoding output terminals to support simultaneous operation of two antenna ports for dual tuners. The outputs for each PWM are Internal Over-Temperature Protection and Diagnostics set to 13V or 18V by independent voltage select commands 2 Internal Overload and Overtemp Flags (Visible on I C) 2 (VSEL1, VSEL2) through the I C bus. Additionally, to LNB Short-Circuit Protection and Diagnostics compensate for the voltage drop in the coaxial cable, the selected voltage may be increased by 1V with the line length QFN Package compensation (LLC) feature. All the functions on this IC are - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat 2 controlled via the I C bus by writing 8 bits on System No Leads - Product Outline Register (SR, 8 bits). The same register can be read back, - Near Chip-Scale Package Footprint and two bits will report the diagnostic status. Separate enable Pb-free Packaging Available 2 commands sent on the I C bus provide independent standby - Designated with Z Suffix (Refer to Note Below) mode control for each PWM and linear combination, disabling the output into shutdown mode. Applications Each output channel is capable of providing 750mA of LNB Power Supply and Control for Satellite Set-Top Box continuous current. The overcurrent limit can be digitally References programmed. The SEL18V pin with QFN package allows the 2 13V to 18V transition with an external pin, over-riding the I C Tech Brief 389 (TB389) - PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages Available input. on the Intersil website, www.intersil.com Ordering Information o PART TEMP. RANGE ( C) PACKAGE PKG. DWG. ISL6405EEB -20 to 85 28 Ld EPSOIC M28.3B ISL6405EEBZ -20 to 85 28 Ld EPSOIC M28.3B (Note 1) (Pb-free) ISL6405ER -20 to 85 32 Ld 5x5 QFN L32.5x5 ISL6405ERZ -20 to 85 32 Ld 5x5 QFN L32.5x5 (Note 1) (Pb-free) NOTES: 1. Intersil Pb-free products employ special Pb-free material sets molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J Std-020B. 2. Tape and Reel available. Add -T suffix for Tape and Reel Packing Option. FN9026 Rev 2.00 Page 1 of 14 Jul 2004ISL6405 ISL6405 (EPSOIC) TOP VIEW VSW2 1 28 VCC COMP2 2 27 CPVOUT FB2 3 26 CPSWIN 25 CPSWOUT GATE2 4 PGND 2 5 24 TCAP2 CS2 6 23 DSQIN2 ISL6405EEB SGND 7 22 VO2 BYPASS 8 21 AGND PGND1 9 20 VO1 GATE1 10 19 DSQIN1 CS1 11 18 TCAP1 FB1 12 17 SCL 16 COMP1 13 ADDR VSW1 14 15 SDA ISL6405 (QFN) TOP VIEW 32 31 30 29 28 27 26 25 PGND2 24 CPSWOUT 1 CS2 2 23 TCAP2 SGND DSQIN2 3 22 SEL18V1 VO2 4 21 ISL6405ER SEL18V2 5 20 AGND BYP VO1 6 19 PGND1 7 18 DSQIN1 GATE1 8 17 TCAP1 910 11 12 13 14 15 16 FN9026 Rev 2.00 Page 2 of 14 Jul 2004 CS1 GATE2 FB1 FB2 COMP1 COMP2 VSW1 VSW2 NC NC SDA VCC ADDR CPVOUT SCL CPSWIN