1FEATURES
• Complete Integration Solution for LNB and I2C
• DiSEqC 1.x Compatible
• Supports 5-V and 12-V Power Bus
• Up to 1000-mA Accurate Output Current Limit
Adjustable by External Resistor and I2C
• Boost Converter With Low Rdson Internal
Power Switch
• Dedicated Enable Pin for Non-I2C Application
• Low Noise, Low Drop Output With Push-Pull
Output Stage
• Built-In Accurate 22-kHz Tone Generator or
External Pin
• Adjustable Soft-Start and 13-V/18-V Voltage
Transition Time
• Compliant with main satellite receiver systems
Specifications
• LNB Short Circuit Dynamic Pprotection
• Diagnostics for Output Voltage Level, Input
Supply UVLO, and DiSEqC Tone Output
• Cable Disconnect Diagnostic
• Available in a 16-Pin QFN 3-mm x 3-mm (RTE)
Package

APPLICATIONS
• Set Top Box Satellite Receiver
• TV Satellite Receiver
• PC Card Satellite Receiver

DESCRIPTION/ORDERING INFORMATION
Designed for analog and digital satellite receivers, the TPS65233 is a monolithic voltage regulator with I2C
interface, specifically to provide the 13-V/18-V power supply and the 22-kHz tone signaling to the LNB downconverter
in the antenna dish or to the multi-switch box. It offers a complete solution with very low component
count, low power dissipation together with simple design and I2C standard interfacing.
TPS65233 features high power efficiency. The boost converter integrates a 120-mΩ power MOSFET running at
500-kHz switching frequency. Drop out voltage at the linear regulator is 0.8 V to minimize power loss. TPS65233
provides multiple ways to generate the 22-kHz signal. Integrated linear regulator with push-pull output stage
generates clean 22-kHz tone signal superimposed at the output even at zero loading. Current limit of linear
regulator can be programmed by external resistor with ±10% accuracy. Full range of diagnostic read by I2C is
available for system monitoring.
The part is available in a 16-pin QFN 3-mm x 3-mm (RTE) package.