TPS65235-1

ACTIVE

LNB voltage regulator with I2C interface in FCCM mode

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Boost Type Converter Vin (min) (V) 4.5 Vin (max) (V) 20 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 1000 Features Adjustable current limit, I2C, Nonsynchronous, Power good Vout (min) (V) 11 Vout (max) (V) 20 Iq (typ) (µA) 120 Duty cycle (max) (%) 78
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Boost Type Converter Vin (min) (V) 4.5 Vin (max) (V) 20 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 1000 Features Adjustable current limit, I2C, Nonsynchronous, Power good Vout (min) (V) 11 Vout (max) (V) 20 Iq (typ) (µA) 120 Duty cycle (max) (%) 78
WQFN (RUK) 20 9 mm² 3 x 3
  • Complete integrated solution for LNB and I 2C interface
  • DiSEqC 2.x, and DiSEqC 1.x compatible
  • Supports 5-V, 12-V, and 15-V power rail
  • Up to 1000-mA accurate output current limit adjustable by external resistor
  • Boost switch peak current limit proportional to LDO current limit
  • Boost converter with 140-mΩ low R ds(on) internal power switch
  • Boost switching frequency 1-MHz or 500-kHz selectable
  • Audible noise avoided at force PWM mode
  • Dedicated enable pin for non-I 2C application
  • Low-dropout (LDO) regulator with push-pull output stage for VLNB output
  • Built-in accurate 22-kHz tone generator and external tone input support
  • Supports both external 44-kHz and 22-kHz tone input
  • Adjustable soft start and 13-V to 18-V voltage transition time
  • 650-mV to 750-mV 22-kHz tone amplitude selection
  • I 2C registers accessible with EN low
  • Short circuit dynamic protection
  • Diagnostics for output voltage level, DiSEqC tone input and output, current level, and cable connection
  • Thermal protection available
  • 20-pin WQFN 3-mm × 3-mm (RUK) package
  • Complete integrated solution for LNB and I 2C interface
  • DiSEqC 2.x, and DiSEqC 1.x compatible
  • Supports 5-V, 12-V, and 15-V power rail
  • Up to 1000-mA accurate output current limit adjustable by external resistor
  • Boost switch peak current limit proportional to LDO current limit
  • Boost converter with 140-mΩ low R ds(on) internal power switch
  • Boost switching frequency 1-MHz or 500-kHz selectable
  • Audible noise avoided at force PWM mode
  • Dedicated enable pin for non-I 2C application
  • Low-dropout (LDO) regulator with push-pull output stage for VLNB output
  • Built-in accurate 22-kHz tone generator and external tone input support
  • Supports both external 44-kHz and 22-kHz tone input
  • Adjustable soft start and 13-V to 18-V voltage transition time
  • 650-mV to 750-mV 22-kHz tone amplitude selection
  • I 2C registers accessible with EN low
  • Short circuit dynamic protection
  • Diagnostics for output voltage level, DiSEqC tone input and output, current level, and cable connection
  • Thermal protection available
  • 20-pin WQFN 3-mm × 3-mm (RUK) package

Designed for analog and digital satellite receivers, the TPS65235-1 is a monolithic voltage regulator with I 2C interface; specifically to provide the 13-V to 18-V power supply and the 22-kHz tone signal to the LNB down converter in the antenna dish or to the multi-switch box. The device offers a complete solution with minimum component count, low power dissipation together with simple design and I 2C standard interface.

The TPS65235-1 features high power efficiency. The boost converter integrates a 140-mΩ power MOSFET running at 1-MHz or 500-kHz selectable switching frequency. Drop out voltage at the linear regulator is 0.8 V to minimize power loss. The TPS65235-1 provides multiple ways to generate the 22-kHz signal. Integrated linear regulator with push-pull output stage generates 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 I 2C is available for system monitoring.

The TPS65235-1 has a special design at FCCM mode to avoid the audible noise especially when VIN is higher or closer to the VLNB output.

The TPS65235-1 supports advanced DiSEqC 2.x standard with 22-kHz tone detection circuit and output interface.

Designed for analog and digital satellite receivers, the TPS65235-1 is a monolithic voltage regulator with I 2C interface; specifically to provide the 13-V to 18-V power supply and the 22-kHz tone signal to the LNB down converter in the antenna dish or to the multi-switch box. The device offers a complete solution with minimum component count, low power dissipation together with simple design and I 2C standard interface.

The TPS65235-1 features high power efficiency. The boost converter integrates a 140-mΩ power MOSFET running at 1-MHz or 500-kHz selectable switching frequency. Drop out voltage at the linear regulator is 0.8 V to minimize power loss. The TPS65235-1 provides multiple ways to generate the 22-kHz signal. Integrated linear regulator with push-pull output stage generates 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 I 2C is available for system monitoring.

The TPS65235-1 has a special design at FCCM mode to avoid the audible noise especially when VIN is higher or closer to the VLNB output.

The TPS65235-1 supports advanced DiSEqC 2.x standard with 22-kHz tone detection circuit and output interface.

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Technical documentation

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* Data sheet TPS65235-1 LNB Voltage Regulator With I2C Interface datasheet (Rev. F) PDF | HTML 02 May 2023
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
Application note DiSEqC™ 2.x Filter Optimization PDF | HTML 11 May 2021
Technical article Lowering audible noise in automotive applications with TI’s DRSS technology PDF | HTML 18 Mar 2021
Application note Introduction to Anti-Audible Noise Function in TPS65235-1 13 Nov 2017
EVM User's guide EVM for the TPS65235-1 LNB Voltage Regulator With I2C Interface for DiSEqC2.x 17 Nov 2016
User guide Evaluation Module for the TPS65235-1 LNB Voltage Regulator With I2C Interface 01 Nov 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS65235EVM-747 — TPS65235 LNB Voltage Regulator with I2C Interface Evaluation Module for DisEqC1.x

The TPS65235EVM-PWR747 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the TPS65235 for DisEqC1.x application. The EVM contains input and output connectors as well as control jumpers to ease evaluation of device features. The TPS65235 is a monolithic voltage regulator (...)

User guide: PDF
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WQFN (RUK) 20 Ultra Librarian

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