TPS65235-1 (ACTIVE)

LNB Voltage Regulator With I2C Interface

LNB Voltage Regulator With I2C Interface - TPS65235-1


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. The device offers a complete solution with minimum component count, low power dissipation together with simple design and I2C 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 I2C 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.


  • 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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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)
Iout (Max) (A)
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   
Adjustable Current Limit
Power Good   
Adjustable Current Limit
Power Good   
1    0.65   
77.5    100   
-40 to 85    -40 to 85   
Catalog    Catalog