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Texas Instruments TPS65235RUKR
- Part No.:
- TPS65235RUKR
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
TPS65235RUKR.pdf
- Description:
- IC REG CONV SATELLIT 1OUT 20WQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS65235RUKR from Texas Instruments is a monolithic LNB voltage regulator with integrated boost converter, low-dropout linear regulator, and 22-kHz tone generator for satellite receiver power delivery. It delivers 13.4 V or 18.2 V output at up to 650 mA, supports DiSEqC 2.x/1.x, features I²C interface and dedicated EN pin, and is used in set-top box LNB power supplies.
For engineers reviewing the TPS65235RUKR datasheet, TPS65235RUKR pinout, TPS65235RUKR application, or TPS65235RUKR equivalent, key selection considerations include programmable current limit (±10% accuracy), selectable 1-MHz/500-kHz boost switching frequency, 22-kHz tone amplitude control (650–750 mV), thermal shutdown at 160°C, and DiSEqC-compliant tone detection and generation.
Technical Context
The TPS65235RUKR integrates a cycle-by-cycle peak-current-limited boost converter (140-mΩ internal FET) followed by a push-pull LDO stage that superimposes 22-kHz tone directly onto VLNB. Its dual-tone capability supports both internal 22-kHz generation and external 44-kHz input via EXTM, with tone amplitude selectable between 650 mV and 750 mV.
DiSEqC compliance is implemented through hardware-level tone detection (DIN/DOUT), GDR-controlled external MOSFET gate drive, and I²C-accessible diagnostics including output voltage status, cable connection health, and fault flags. Output voltage transition (13.4 V ↔ 18.2 V) is slew-rate controlled via TCAP capacitor with ~2 ms timing using 22 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 13.4 V or 18.2 V (selectable via VCTRL pin); enables dual-voltage LNB powering for universal satellite reception |
| Max Output Current | 650 mA typical (with 200-kΩ ISET resistor); accurate ±10% current limiting protects against cable faults and short circuits |
| Tone Frequency | 22 kHz (default) or 44 kHz (with EXTM input + register bit); meets DiSEqC 1.x/2.x carrier requirements |
| Tone Amplitude | 650–750 mV (selectable); sufficient headroom for reliable DiSEqC command decoding over long coaxial runs |
| Boost Switching Freq | 1 MHz or 500 kHz (pin-selectable); balances efficiency, EMI, and passive component size in compact designs |
| Dropout Voltage | 0.44–1.2 V (load- and tone-dependent); minimizes power loss in LDO stage while preserving tone fidelity |
| Thermal Shutdown | 160°C trip point with 20°C hysteresis; ensures safe operation under sustained high-load or poor heatsinking conditions |
| I²C Interface | Standard-mode (400 kHz max); enables full diagnostics readback (voltage, current, tone status, cable health) |
Pinout & Package
TPS65235RUKR is housed in a thermally enhanced 20-pin WQFN package (3.0 mm × 3.0 mm, RUK suffix) with exposed thermal pad requiring PCB soldering and thermal vias for optimal junction temperature management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Boost switch node | Connects to external inductor; carries high di/dt switching current; requires tight layout and low-inductance path to PGND |
| VIN | Main input supply | Accepts 4.5–20 V DC; powers internal regulators and boost stage; UVLO triggers at 4.3 V nominal |
| VLNB | LNB output | Delivers regulated 13.4/18.2 V + 22-kHz tone; connects directly to coaxial cable; supports cable detection via current threshold |
| ISET | Current limit programming | Resistor-to-ground sets LDO current limit (e.g., 200 kΩ → 650 mA); enables precise overcurrent protection calibration |
| TCAP | Slew rate control | Capacitor-to-ground sets 13 V ↔ 18 V transition time (~2 ms with 22 nF); prevents overshoot and ensures DiSEqC timing compliance |
| EN | Enable control | Active-high logic input; disables VLNB and pulls output to ground when low; allows I²C access regardless of EN state |
| FAULT | Fault indicator | Open-drain output pulled low on thermal shutdown, overcurrent, or undervoltage; requires external pull-up for host MCU monitoring |
| GDR | External MOSFET gate driver | Drives gate of external NMOS for DiSEqC 2.x bidirectional communication; outputs ~23.5 V when active |
| DIN / DOUT | Tone detection interface | DIN accepts AC-coupled 22-kHz tone (0.3–1.5 VPP); DOUT provides open-drain presence flag with <1.5-cycle delay |
| SDA / SCL | I²C interface | Standard bidirectional data/clock pins; accessible even with EN low; support full diagnostic register readback |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DiSEqC 2.x solution | Hardware tone detection (DIN/DOUT), GDR-driven external MOSFET, and I²C-configurable tone mode eliminate discrete support components |
| Programmable LNB current limit | External resistor on ISET pin sets 580–720 mA limit with ±10% accuracy-enables robust cable fault tolerance without derating |
| Dual-tone generation capability | Internal 22-kHz generator + external 44-kHz input support via EXTM pin and Control Register 1 bit-ensures compatibility with legacy and advanced LNBs |
| Thermal and fault diagnostics | I²C-accessible registers report real-time VLNB voltage, load current, tone status, cable connection, and fault cause-reduces system-level debug time |
| Soft-start and transition control | TCAP pin controls 13.4 V ↔ 18.2 V slew rate (~2 ms); prevents DiSEqC command corruption during voltage switching |
| Low-RDS(on) boost switch | 140-mΩ internal MOSFET reduces conduction loss; combined with 1-MHz switching enables >90% efficiency at 500 mA (18.2 V output) |
Applications
| Set-Top Box Satellite Receiver | TV Satellite Receiver |
|---|---|
Use Scenario: Powering LNB in consumer-grade satellite set-top boxes with DiSEqC switching for multi-LNB or multi-satellite configurations. IC Role / Device Role / Timing Role: Primary LNB power regulator delivering 13.4 V/18.2 V and 22-kHz tone; handles DiSEqC command transmission and response verification. Use Value: Eliminates need for discrete boost + LDO + tone circuitry; reduces BOM count by ≥7 components while maintaining DiSEqC 2.x compliance. |
Use Scenario: Integrated satellite TV receivers where space-constrained PCB layout demands high integration and minimal external passives. IC Role / Device Role / Timing Role: Single-chip LNB supply with I²C diagnostics; manages voltage transitions, tone injection, and cable health monitoring in real time. Use Value: Enables automatic LNB detection and fault recovery via I²C status registers-reducing field return rates due to coaxial cable faults. |
| PC Card Satellite Receiver | Satellite TV Tuner Module |
Use Scenario: Miniaturized satellite tuner cards for laptops or embedded media PCs requiring ultra-low profile power solutions. IC Role / Device Role / Timing Role: Compact LNB regulator in 3×3 mm WQFN; delivers regulated power and tone with minimal board area and thermal footprint. Use Value: 3-mm × 3-mm RUK package fits within tight card-edge constraints; thermal pad + vias enable 1-A operation without heatsink. |
Use Scenario: OEM tuner modules for smart TVs and streaming devices needing certified DiSEqC interoperability and production testability. IC Role / Device Role / Timing Role: Production-testable LNB supply with I²C-readback diagnostics (PGOOD, current, tone detect) for automated functional testing. Use Value: Full register visibility enables 100% in-circuit validation of LNB power integrity-reducing final assembly test escapes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LNB power regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65233RUKR | Single-output (13.4 V only), no 22-kHz tone generation, no DiSEqC detection, no GDR pin | Restricted to fixed-voltage LNBs without DiSEqC switching or tone-based control | Select only for cost-sensitive, non-DiSEqC applications where tone and dual-voltage capability are unnecessary |
| MAX2104ETL+ | Higher dropout (1.5 V min), no integrated boost, requires external 22-kHz oscillator, no I²C diagnostics | Lacks DiSEqC 2.x support and real-time fault reporting; limited to basic analog satellite receivers | Choose when legacy design reuse is required and diagnostic capability is not needed; verify thermal margin at full load |
Compared with TPS65235RUKR, TPS65233RUKR omits tone generation and DiSEqC features to reduce cost and complexity, while MAX2104ETL+ relies on external components for tone and lacks integrated diagnostics-making TPS65235RUKR the only option supporting full DiSEqC 2.x with on-chip intelligence and compact packaging.
Availability
TPS65235RUKR is available at Aetrix Electronics and suitable for satellite TV tuner modules, set-top box LNB power supplies, and PC-based satellite receivers requiring stable component supply, DiSEqC 2.x compliance, and compact 3×3 mm packaging.
Supply support for TPS65235RUKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability, application-optimized power solutions.
The TPS65235RUKR belongs to TI's satellite receiver power management product line, designed specifically to consolidate LNB voltage regulation, DiSEqC tone generation, and diagnostics into a single WQFN package for consumer and professional satellite equipment.
FAQ
What is the maximum output current capability of the TPS65235RUKR?
The TPS65235RUKR delivers up to 650 mA typical output current at 18.2 V with a 200-kΩ resistor on the ISET pin. Its current limit is programmable from 580 mA to 720 mA across temperature, with ±10% accuracy. The device clamps output current during overload and enters hiccup mode if the condition persists beyond 4 ms, ensuring robust protection without latch-up.
How does the TPS65235RUKR support DiSEqC 2.x communication?
The TPS65235RUKR supports DiSEqC 2.x through integrated hardware features: a dedicated GDR pin drives an external NMOS for bidirectional signaling, DIN/DOUT pins provide tone detection with <1.5-cycle latency, and I²C registers report tone presence, cable health, and fault status. No external tone generator or level-shifting circuitry is required-full DiSEqC 2.x functionality is enabled in a single chip.
Can the TPS65235RUKR generate both 22-kHz and 44-kHz tones?
Yes-the TPS65235RUKR generates 22-kHz tone by default using its internal oscillator. When a 44-kHz signal is applied to the EXTM pin and the EXTM TONE bit in Control Register 1 is set to "1", the device outputs 44-kHz tone instead. This dual-frequency capability ensures compatibility with both legacy DiSEqC 1.x LNBs and newer 44-kHz-enabled devices without changing hardware.
What is the role of the TCAP pin on the TPS65235RUKR?
The TCAP pin on the TPS65235RUKR sets the slew rate for voltage transitions between 13.4 V and 18.2 V. A capacitor (e.g., 22 nF) connected from TCAP to AGND establishes ~2 ms rise/fall time, preventing DiSEqC command corruption during switching. This controlled transition ensures the boost converter tracks the LDO reference accurately and avoids false PGOOD assertions during state changes.
Does the TPS65235RUKR require external components for basic operation?
Yes-the TPS65235RUKR requires external components for core functionality: an inductor (4.7 µH) and input/output capacitors (e.g., 100 nF ceramic on VLNB), a resistor on ISET for current limit setting, a capacitor on TCAP for slew control, and a charge-pump capacitor between VCP and VLNB. However, it eliminates the need for discrete tone generators, boost controllers, LDOs, and DiSEqC interface circuitry-reducing total BOM count by ≥7 parts.
How is thermal performance managed in the TPS65235RUKR?
The TPS65235RUKR incorporates junction-temperature monitoring with thermal shutdown at 160°C and 20°C hysteresis. Its 3×3 mm WQFN package includes an exposed thermal pad that must be soldered to PCB copper and connected via thermal vias to internal ground planes. With proper layout, the device achieves 16.5°C/W junction-to-board thermal resistance, enabling continuous 650 mA operation at 125°C ambient without derating.
TPS65235RUKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, Satellite Set-Top Box Designs
- Voltage - Input:
- 4.5V ~ 16V
- Number of Outputs:
- 1
- Voltage - Output:
- 13.4V, 18.2V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WQFN (3x3)
TPS65235RUKR FAQ
1.How can I place an order for TPS65235RUKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65235RUKR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS65235RUKR reliable?
The price and inventory of TPS65235RUKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65235RUKR is usually 5 days.
3.What payment methods are accepted for TPS65235RUKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65235RUKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65235RUKR?
TPS65235RUKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65235RUKR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS65235RUKR?
For technical support, including TPS65235RUKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65235RUKR requirements.
6.How does Aetrix verify that TPS65235RUKR is sourced from the original manufacturer or authorized distributors?
All TPS65235RUKR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS65235RUKR meets industry standards.
7.What is the process for return or replacement of TPS65235RUKR?
All TPS65235RUKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65235RUKR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS65235RUKR part is unused and in its original packaging.
Return procedure for TPS65235RUKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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