DATASHEET ISL6423B FN6412 Rev 1.00 Single Output LNB Supply and Control Voltage Regulator with I2C Interface for Apr 10, 2007 Advanced Satellite Set-Top Box Designs The ISL6423B 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) - Operation for 1-Tuner/1-Dish Applications modules to the low noise blocks (LNBs) of singe antenna 2 - Integrated DC/DC Converter and I C Interface ports. The device consists of a current-mode boost PWM and a low-noise linear regulator along with the circuitry Switch-Mode Power Converter for Lowest Dissipation 2 required for 22kHz tone generation, modulation and I C - Boost PWMs with >92% Efficiency device interface. The device makes the total LNB supply - Selectable 13.3V or 18.3V Outputs design simple, efficient and compact with low external - Digital Cable Length Compensation (1V) 2 component count. -I C and Pin Controllable Output The current-mode boost converters provides the linear Output Back Bias Capability of 28V regulator with input voltage that is set to the final output 2 I C Compatible Interface for Remote Device Control voltages, plus typically 0.8V to insure minimum power Registered Slave Address 0001 00XX dissipation across each linear regulator. This maintains constant voltage drop across the linear pass element while 2.5V, 3.3V, 5V Logic Compatible permitting adequate voltage range for tone injection. External Pin to Toggle Between V and H Polarization The final regulated output voltage is available at output Built-In Tone Oscillator Factory Trimmed to 22kHz terminals to support the operation of an antenna port for - Facilitates DiSEqC (EUTELSAT) Encoding single tuners. The outputs for each PWM can be controlled - External Modulation Input 2 in two ways, full control from I C using the VTOP and VBOT 2 bits or set the I C to the lower range i.e., 13V/14V, and Internal Over-Temperature Protection and Diagnostics switch to higher range i.e., 18V/19V, with the SELVTOP pin. Internal OV, UV, Overload and Overtemp Flags 2 All the functions on this IC are controlled via the I C bus by 2 (Visible on I C) writing 8 bits words onto the System Registers (SR). The 2 FLT signal same register can be read back, and five I C bits will report the diagnostic status. Separate enable command sent on the LNB Short-Circuit Protection and Diagnostics 2 I C bus provides for standby mode control for the PWM and QFN, EPTSSOP Packages linear combination, disabling the output and forcing a shutdown mode. The output channel is capable of providing 750mA of Pb-Free Available (RoHS Compliant) continuous current. The overcurrent limit can be digitally Applications programmed to four levels. LNB Power Supply and Control for Satellite Set-Top Box The External modulation input EXTM can accept a modulated Diseqc command and transfer it symmetrically to Ordering Information the output. Alternatively the EXTM pin can be used to PART PART TEMP. PKG. modulate the continuos internal tone. NUMBER* MARKING (C) PACKAGE DWG. The FLT pin serves as an interrupt for the processor when ISL6423BERZ 6423BERZ -20 to +85 24 Ld 4x4 QFN L24.4x4D any condition turns OFF the LNB controller (Over (Pb-free) (Note) Temperature, Overcurrent, Disabled). The nature of the ISL6423BEVEZ ISL6423BEVEZ -20 to +85 28 Ld EPTSSOP M28.173B 2 Disable can be read of the I C registers. (Pb-free) (Note) NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and 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-020. Add -T suffix for tape and reel. FN6412 Rev 1.00 Page 1 of 16 Apr 10, 2007ISL6423B Pinouts ISL6423B (28 LD EPTSSOP) TOP VIEW VCC 1 28 CPSWIN NC 2 27 CPSWOUT 3 26 CPVOUT FLT 25 EXTM SGND 4 SGND 5 24 SDA TCAP 6 23 SCL ADDR0 7 22 TDOUT ADDR1 8 21 TDIN BYPASS 9 20 VO PGND 10 19 NC GATE 11 18 NC 17 AGND VSW 12 NC 13 16 SELVTOP CS 14 15 TXT ISL6423B (24 LD QFN) TOP VIEW 24 23 22 21 20 19 SGND EXTM 1 18 TCAP 2 17 SDA ADDR0 SCL 3 16 ADDR1 15 TDOUT 4 BYPASS TDIN 5 14 PGND VO 6 13 78 9 10 11 12 FN6412 Rev 1.00 Page 2 of 16 Apr 10, 2007 GATE SGND VSW FLT CS VCC TXT CPSWIN SELVTOP CPSWOUT AGND CPVOUT