TPS65235-1 Datasheet, PDF (1/39 Pages) Texas Instruments – LNB Voltage Regulator With I2C Interface

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TPS65235-1
SLVSDP1 – JANUARY 2017
TPS65235-1 LNB Voltage Regulator With I²C Interface
1 Features
•1 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 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-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 x 3 mm (RUK) Package
3 Description
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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65235-1
WQFN
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
2 Applications
• Set Top Box Satellite Receiver
• TV Satellite Receiver
• PC card Satellite Receiver
• Satellite TV
TPS65235-1
VOUT
100nF
0.1PF
2x22PF
VLNB
VCP
BOOST
PGND
ISET
TCAP
22nF
110k
VIN
10PF
10PH
1PF
AGND
LX
VCC
VIN
1PF
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.