TPS65235-1 Texas instruments

TPS65235-1

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TPS65235-1

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Описание

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.

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

Topology	Boost
Vin (min) (V)	4.5
Vin (max) (V)	20
Vout (min) (V)	11
Vout (max) (V)	20
Switch current limit (typ) (A)	3
Type	Converter
Regulated outputs (#)	1
Switching frequency (min) (kHz)	500
Switching frequency (max) (kHz)	1000
Iq (typ) (mA)	0.12
Features	Adjustable current limit, I2C, Power good
Duty cycle (max) (%)	78
Operating temperature range (°C)	-40 to 85
Rating	Catalog