LNB Voltage Regulator With I2C Interface - TPS65235-1

TPS65235-1 (ACTIVE)

LNB Voltage Regulator With I2C Interface



Designed for analog and digital satellite receivers, the TPS65235-1 is a monolithic voltage regulator with I2C 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. It offers a complete solution with minimum component count, low power dissipation together with simple design and I2C standard interface.

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. 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 I2C is available for system monitoring.

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.

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


  • 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 Drop Output LDO 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-Lead WQFN 3 mm × 3 mm (RUK) Package

View more

Parametrics Compare all products in Boost Converter (Integrated Switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Typ) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
TPS65235-1 TPS65235
4.5    4.5   
16    20   
11    4.5   
20    20   
3    2.8   
1    1   
500    977   
1000    1134   
0.12    0.12   
77.5    100   
-40 to 85    -40 to 85   
Catalog    Catalog