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Texas Instruments TPS65178ARSLR
- Part No.:
- TPS65178ARSLR
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
TPS65178ARSLR.pdf
- Description:
- IC BIAS PWR SUP FOR LCD 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,767
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Product details
Overview
TPS65178ARSLR from Texas Instruments is a fully programmable LCD bias IC for TV applications, integrating six gamma buffers (9-bit), VCOM reference with dynamic gain control, 16-V/500-mA boost converter (VDD), 3.3-V/2.0-A buck converter (VCC), 1.8-V/100-mA buck converter (VEPI), and temperature-compensated positive/negative charge pumps (VGH/VGL) in a single 48-pin QFN package.
For engineers reviewing the TPS65178ARSLR datasheet, TPS65178ARSLR pinout, TPS65178ARSLR application, or TPS65178ARSLR equivalent, this device supports I²C-programmable sequencing, 4-wire gamma voltage generation, panel-level VCOM dynamic gain switching via DYN pin, and thermistor-based VGH temperature compensation - critical for GIP-based LCD TV power architectures.
Technical Context
The TPS65178ARSLR implements four synchronous buck converters (VCC, VCORE, HVDD, VEPI), one boost converter (VDD), dual charge pumps (VGH/VGL), and a 6-channel gamma DAC - all coordinated via a two-wire I²C interface. Its VCORE default output is 1.8 V (vs. 1.0 V for TPS65178), confirming its A-variant identity for higher-performance LCD timing controllers.
It features integrated input-to-output isolation FET (SWI/SWO), programmable sequencing delays (3 × 3-bit, up to 35 ms per stage), thermal shutdown at 138°C, and dedicated pins for temperature compensation (TCOMP), dynamic VCOM gain selection (DYN), and panel feedback (VCOMFB).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 8.6 V to 14.7 V - supports wide-input industrial LCD power rails without external pre-regulation |
| VDD boost output | 12.8 V to 19 V (6-bit, ±2% accuracy) - powers source drivers requiring stable high-voltage bias |
| VCC buck output | 3.0 V to 3.7 V (3-bit, ±3% accuracy, 2.0 A) - supplies T-con logic and interface circuitry |
| VCORE output (TPS65178A) | 1.8 V default (0.9–2.4 V, 4-bit, ±3%) - optimized for modern low-voltage LCD timing controller cores |
| VGH charge pump | 17 V to 32 V (HT) / 19 V to 34 V (LT), 4-bit, ±3.5% - enables gate driver voltage scaling across temperature |
| VGL charge pump | –1.8 V to –8.1 V (6-bit, ±3.5%) - provides negative gate bias for TFT-LCD panel switching |
| Gamma buffer resolution | 9-bit (512 steps) for all 6 channels - delivers fine-grained grayscale voltage tuning for uniform display luminance |
| I²C interface | Standard/fast mode (100/400 kHz) - enables real-time configuration and calibration during production or field update |
Pinout & Package
TPS65178ARSLR uses a 48-pin, 6-mm × 6-mm QFN package with exposed PowerPAD™ thermal pad (AGND). Pin functions are validated per TI SLVSAP8D datasheet Rev. July 2012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Reset generator open-drain output | Drives T-con reset line; active-low, requires external pull-up; supports programmable delay |
| VGH | VGH output voltage sense | Feedback node for positive charge pump regulation; connects to gate driver supply rail |
| VGL | VGL output voltage sense | Feedback node for negative charge pump regulation; connects to gate driver negative bias rail |
| GMA1–GMA6 | Gamma buffer DAC outputs | Drive TFT-LCD source driver gamma reference inputs; each supports ±30 mA continuous current |
| VCOM, POS, NEG, VCOMFB | VCOM reference generation & feedback | POS/NEG form programmable gain amplifier; VCOMFB enables closed-loop panel-level VCOM adjustment |
| TCOMP | Temperature compensation input | Accepts thermistor/pull-up network to dynamically adjust VGH based on panel temperature |
| DYN | Dynamic VCOM gain select | Logic-level input (high = –2×, low = –4×) enabling real-time VCOM gain switching by T-con |
| SCL/SDA | I²C serial interface | Two-wire bus for full register configuration, sequencing setup, and voltage calibration |
Key Features
| Feature | Design Value |
|---|---|
| 6-channel 9-bit gamma buffer | Enables precise grayscale voltage distribution across full display area without external DACs |
| Programmable VCOM reference with dynamic gain | Supports both fixed (2-bit) and T-con-driven dynamic (1-bit DYN pin) gain modes for adaptive panel tuning |
| Integrated isolation FET (SWI/SWO) | Provides input-to-output decoupling for VDD rail; prevents backfeed during fault or power-down |
| Thermistor-based VGH temperature compensation | Automatically adjusts gate drive voltage across –40°C to +85°C ambient using external NTC network |
| Four independent programmable buck converters | VCC (3.3 V), VCORE (1.8 V), HVDD (VDD/2), VEPI (1.8 V) - eliminates need for discrete DC/DC stages |
| Single-BOM flexibility via I²C programming | One hardware design supports multiple panel types via stored non-volatile register settings |
Applications
| LCD TV Power Management | TFT-LCD Panel Bias Supply |
|---|---|
Use Scenario: Powering 32–65-inch LCD TVs with GIP (Gate-in-Panel) architecture requiring temperature-adaptive gate drive voltages. IC Role / Device Role / Timing Role: Central bias IC generating VDD, VGH, VGL, VCC, VCORE, HVDD, VEPI, and 6 gamma references under I²C control. Use Value: Eliminates 7+ discrete regulators and charge pumps; reduces BOM count by >60% versus discrete solutions. |
Use Scenario: Driving high-resolution TFT-LCD panels in commercial monitors with tight gamma uniformity requirements. IC Role / Device Role / Timing Role: Provides 9-bit gamma DAC outputs (VGMA1–6), programmable VCOM reference, and dynamic gain switching via DYN pin. Use Value: Achieves <±0.6 LSB INL across all gamma channels, enabling factory-calibrated grayscale linearity. |
| VCOM Dynamic Gain Control System | Thermally Compensated Gate Driver Supply |
Use Scenario: Adaptive VCOM correction during video content transitions (e.g., dark-to-bright scenes) in premium LCD TVs. IC Role / Device Role / Timing Role: Uses DYN pin to switch VCOM gain between –2× and –4× in real time, synchronized to T-con timing signals. Use Value: Reduces vertical crosstalk and improves contrast ratio stability without firmware intervention. |
Use Scenario: Maintaining stable VGH voltage across operating temperature range (–40°C to +85°C) in outdoor digital signage. IC Role / Device Role / Timing Role: Reads thermistor voltage at TCOMP pin and adjusts VGH_LT/VGH_HT registers to maintain gate driver margin. Use Value: Prevents gate driver underdrive at low temperature and overvoltage stress at high temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD bias IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65177ARSLR | Lower VGH range (15–28 V), no VCOM dynamic gain, 3.3-V VCORE default only | Targeted for cost-sensitive monitors without GIP or advanced VCOM tuning | Choose when VGH <28 V suffices and DYN-driven gain switching is unnecessary |
| RTQ2132B-QT | 3-channel gamma buffer, no VCOM gain control, 12-V max VGH, automotive AEC-Q100 qualified | Designed for automotive instrument clusters; lacks TCOMP, DYN, and 6-channel gamma | Prefer for automotive-grade designs where AEC-Q100 compliance and functional safety matter more than gamma precision |
Compared with TPS65177ARSLR and RTQ2132B-QT, the TPS65178ARSLR uniquely combines 6-channel 9-bit gamma, thermistor-based VGH compensation, and DYN-pin dynamic VCOM gain - making it the only option for high-end LCD TVs requiring panel-level adaptive biasing.
Availability
TPS65178ARSLR is available at Aetrix Electronics and suitable for LCD TV manufacturing, TFT-LCD panel integration, and high-reliability display system design requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS65178ARSLR 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in display power solutions.
The TPS65178A product line was designed specifically for high-performance LCD TV biasing - integrating gamma DACs, VCOM control, and temperature-compensated charge pumps into a compact QFN to replace multi-chip discrete power trees.
FAQ
What is the default VCORE output voltage for TPS65178ARSLR?
The TPS65178ARSLR has a default VCORE output voltage of 1.8 V, distinguishing it from the base TPS65178 (1.0 V default). This setting is factory-programmed and can be reconfigured via I²C within the 0.9–2.4 V range using its 4-bit DAC. The 1.8 V default aligns with modern low-power timing controller cores used in 4K LCD TVs, and the TPS65178ARSLR datasheet confirms this value under "ORDERING INFORMATION" and "ELECTRICAL CHARACTERISTICS" sections.
Does TPS65178ARSLR support temperature compensation for VGH?
Yes, the TPS65178ARSLR supports temperature compensation for VGH through its dedicated TCOMP pin, which accepts an external thermistor/pull-up resistor network. It stores two programmable VGH voltage sets - VGH_LT (low-temp, 19–34 V) and VGH_HT (high-temp, 17–32 V) - and interpolates between them based on the TCOMP voltage. This feature is explicitly documented in the "POSITIVE CHARGE PUMP CONTROLLER" section and Figure 22–23 of the TPS65178ARSLR datasheet.
How many gamma reference outputs does TPS65178ARSLR provide, and what is their resolution?
The TPS65178ARSLR provides six gamma reference outputs (GMA1–GMA6), each with 9-bit resolution (512 steps). Channels GMA1–GMA3 span VDD/2 to VDD; GMA4–GMA6 span 0 V to VDD/2. Output accuracy is specified with ±0.6 LSB integral nonlinearity and ±0.3 LSB differential nonlinearity. These values are confirmed in the "GAMMA BUFFER [GMA]" electrical characteristics table and "DAC RANGE SUMMARY" section of the TPS65178ARSLR datasheet.
What package type and thermal characteristics apply to TPS65178ARSLR?
The TPS65178ARSLR uses a 48-pin, 6-mm × 6-mm QFN package with exposed PowerPAD™ (AGND). Its thermal metrics include θJA = 29.1°C/W, θJCbot = 1.7°C/W, and ψJB = 5.3°C/W - indicating strong board-level heat dissipation capability. The PowerPAD must be soldered to a thermal pad on the PCB for reliable operation at full load. These specifications are listed in the "THERMAL INFORMATION" table of the TPS65178ARSLR datasheet.
Can TPS65178ARSLR generate both positive and negative bias voltages for LCD gate drivers?
Yes, the TPS65178ARSLR integrates both a positive charge pump (VGH: 17–34 V) and a negative charge pump (VGL: –1.8 V to –8.1 V), each with independent 4-bit programmability and ±3.5% output accuracy. VGH supports temperature compensation via TCOMP, while VGL uses the same flying/storage capacitor values (220 nF / 100 nF) and 4.7-µF output cap. This dual-pump architecture is confirmed in the "FEATURES", "RECOMMENDED OPERATING CONDITIONS", and "ELECTRICAL CHARACTERISTICS" sections of the TPS65178ARSLR datasheet.
TPS65178ARSLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- LCD TV/Monitor
- Current - Supply:
- -
- Voltage - Supply:
- 8.6V ~ 14.7V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-VQFN (6x6)
TPS65178ARSLR FAQ
1.How can I place an order for TPS65178ARSLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65178ARSLR 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 TPS65178ARSLR reliable?
The price and inventory of TPS65178ARSLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65178ARSLR is usually 5 days.
3.What payment methods are accepted for TPS65178ARSLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65178ARSLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65178ARSLR?
TPS65178ARSLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65178ARSLR 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 TPS65178ARSLR?
For technical support, including TPS65178ARSLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65178ARSLR requirements.
6.How does Aetrix verify that TPS65178ARSLR is sourced from the original manufacturer or authorized distributors?
All TPS65178ARSLR 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 TPS65178ARSLR meets industry standards.
7.What is the process for return or replacement of TPS65178ARSLR?
All TPS65178ARSLR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65178ARSLR, 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 TPS65178ARSLR part is unused and in its original packaging.
Return procedure for TPS65178ARSLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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