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LNB Voltage Regulator With I2C Interface


Package | PIN: RUK | 20
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $2.44
10-24 $2.20
25-99 $2.04
100-249 $1.79
250-499 $1.68
500-749 $1.43
750-999 $1.20
1000+ $1.15


  • Complete Integrate Solution for LNB and I2C 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 Rds(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-I2C 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
  • I2C 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

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Texas Instruments  TPS65235-1RUKT

Designed for analog and digital satellite receivers, the TPS65235-1 is a monolithic voltageregulator with I2C interface; specifically to provide the 13-V to 18-Vpower supply and the 22-kHz tone signal to the LNB down converter in the antenna dish or to themulti-switch box. The device offers a complete solution with minimum component count, low powerdissipation together with simple design and I2C standardinterface.

The TPS65235-1features high power efficiency. The boost converter integrates a 140-mΩ power MOSFET running at 1MHz or 500 kHz selectable switching frequency. Drop out voltage at the linear regulator is 0.8 V tominimize power loss. The TPS65235-1 provides multiple ways to generate the 22 kHz signal. Integratedlinear regulator with push-pull output stage generates 22-kHz tone signal superimposed at theoutput even at zero loading. Current limit of linear regulator can be programmed by externalresistor with ±10% accuracy. Full range of diagnostic read by I2C isavailable for system monitoring.

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

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