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Texas Instruments TPS65178RSLT
- Part No.:
- TPS65178RSLT
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
TPS65178RSLT.pdf
- Description:
- IC BIAS PWR SUP FOR LCD 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:497
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Product details
Overview
TPS65178RSLT from Texas Instruments is a fully programmable LCD bias IC for TV applications, integrating six gamma buffers, VCOM reference with dynamic gain, 16-V/500-mA boost converter (VDD), 3.3-V/2.0-A buck converter (VCC), 1.0-V/500-mA synchronous buck converter (VCORE), 8-V/500-mA buck converter (HVDD), 1.8-V/100-mA buck converter (VEPI), ±6-V/100-mA negative charge pump (VGL), and 24-V/100-mA positive charge pump (VGH) with temperature compensation.
For engineers reviewing the TPS65178RSLT datasheet, TPS65178RSLT pinout, TPS65178RSLT application, or TPS65178RSLT equivalent, this device supports I²C-programmable sequencing, 9-bit gamma DACs, dual-temperature VGH compensation, 6-channel gamma buffering, and integrated isolation FET - critical for TFT-LCD panel power architecture validation and TCON interface design.
Technical Context
The TPS65178RSLT implements four synchronous buck converters (VCC, VCORE, HVDD, VEPI), one boost converter (VDD), two independent charge pumps (VGH/VGL), and a 6-channel gamma DAC with split-range output topology (GMA1–GMA3: VDD/2 to VDD; GMA4–GMA6: 0 to VDD/2). All rails are I²C-programmable with up to 9-bit resolution for gamma and VCOM, and 4-bit resolution for VGH/VGL/VCORE/VEPI.
It features programmable power-up sequencing (three 5-ms–35-ms delays), thermal shutdown at 138°C, undervoltage lockout (8.6 V), and temperature-compensated VGH control via external thermistor on TCOMP pin. The device uses internal regulators (VL = 5.0 V) and supports chip inductors for compact layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 8.6 V to 14.7 V - defines minimum/maximum supply for stable operation across wide-input LCD panel designs |
| VDD output | 12.8 V to 19 V (6-bit, ±2% accuracy) - powers source drivers; programmable step size 100 mV |
| VCC output | 3.0 V to 3.7 V (3-bit, ±3% accuracy, 2.0 A max) - supplies TCON logic; supports tight regulation under dynamic load |
| VCORE output | 0.9 V to 2.4 V (4-bit, ±3% accuracy, 500 mA max) - powers processor cores; default 1.0 V for TPS65178RSLT |
| VGH output | 19 V to 34 V (low-temp) / 17 V to 32 V (high-temp), 4-bit programmable - gate-on voltage with thermistor-based compensation |
| VGL output | –1.8 V to –8.1 V (6-bit, ±3.5% accuracy, 100 mA max) - gate-off voltage with fast transient response |
| Gamma buffer resolution | 9-bit per channel (GMA1–GMA6), 512 steps - enables precise grayscale linearity tuning for 1080p+ panels |
| I²C interface | Standard/Fast mode (100/400 kHz), compatible with TCON microcontrollers - enables full rail and sequence configuration without external EEPROM |
Pinout & Package
TPS65178RSLT is housed in a thermally enhanced 48-pin 6-mm × 6-mm QFN package with exposed PowerPAD™ (AGND) for improved thermal dissipation. Pin count and layout match TI's SLVSAP8D specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVIN | Internal regulator input | Supplies 5.0-V VL rail; requires ≥1 µF ceramic capacitor for stability |
| RST | Open-drain reset output | Signals TCON when all rails reach valid levels; requires external pull-up |
| SCL/SDA | I²C serial interface | Configures all outputs, sequencing, and gain modes; supports multi-device addressing |
| GMA1–GMA6 | Gamma DAC outputs | Drive TFT source line references; split-range topology enables full-panel gamma curve shaping |
| VCOM/VCOMFB | VCOM reference and feedback | Provides programmable VCOM voltage (6.5 V typical) with dynamic gain selection via DYN pin |
| TCOMP | Temperature compensation input | Accepts thermistor network to adjust VGH based on panel temperature - essential for GIP displays |
| CTRLP/CTRLN | Charge pump base drive | Drive external bipolar transistors for high-efficiency VGH/VGL generation |
| SWB1–SWB4, SWI, SWP, SWN, SW | Power switch nodes | Connect to external inductors/flying capacitors; require careful PCB layout for EMI and thermal management |
Key Features
| Feature | Design Value |
|---|---|
| 6-channel gamma buffer with 9-bit resolution | Enables pixel-level grayscale precision across full brightness range without external DACs |
| Programmable VCOM reference + dynamic gain | Supports both fixed (–1x to –3x) and TCON-driven dynamic (–2x/–4x) gain for flicker reduction |
| Integrated isolation FET with 100-mΩ rDS(on) | Eliminates need for discrete high-side switch between VDD and downstream rails during fault conditions |
| Three independent programmable sequencing delays | Allows fine-grained startup timing (5–35 ms steps) to meet panel-specific power-up requirements |
| Thermistor-based VGH temperature compensation | Automatically adjusts gate-on voltage across –40°C to 85°C ambient - critical for outdoor/industrial LCDs |
| Single-BOM flexibility via I²C programming | One hardware design supports multiple panel types; output voltages stored in embedded NVM |
Applications
| LCD TV Panel Power | TFT-LCD Monitor Biasing |
|---|---|
|
Use Scenario: Powering 4K UHD LCD TV panels with integrated TCON and GIP gate drivers. IC Role / Device Role / Timing Role: Central bias IC generating VDD, VCC, VCORE, HVDD, VEPI, VGH, VGL, VCOM, and gamma references under I²C control. Use Value: Reduces BOM count by consolidating 11 rails into one IC; eliminates discrete charge pumps and gamma DACs. |
Use Scenario: Driving 27-inch WQHD monitors requiring stable VGH/VGL over extended temperature ranges. IC Role / Device Role / Timing Role: Provides temperature-compensated VGH (19–34 V) and VGL (–1.8 to –8.1 V) with <100-µs transient response. Use Value: Prevents gate driver misfiring during thermal cycling; maintains image uniformity without manual calibration. |
| Industrial HMI Displays | Medical Imaging Panels |
|
Use Scenario: Powering ruggedized 10.1-inch industrial HMIs operating from 12-V automotive or PoE-derived supplies. IC Role / Device Role / Timing Role: Delivers sequenced, regulated rails (VCC=3.3 V, VCORE=1.0 V, VGL=–5 V) with thermal shutdown and UVLO protection. Use Value: Ensures reliable startup and fault recovery in uncontrolled environments; meets IEC 61000-4 immunity requirements. |
Use Scenario: Biasing diagnostic-grade 15.6-inch medical LCDs where grayscale fidelity and long-term VCOM stability are critical. IC Role / Device Role / Timing Role: Supplies 9-bit gamma references (GMA1–GMA6) and programmable VCOM (6.5 V ±1.5%) with dynamic gain. Use Value: Enables DICOM-compliant luminance linearity; reduces post-manufacturing gamma calibration time by >70%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD bias IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65178ARSLT | Default VCORE = 1.8 V (vs. 1.0 V); identical pinout, package, and feature set | Targeted for higher-performance TCONs requiring 1.8-V core supply instead of 1.0-V | Select TPS65178ARSLT only when system-level VCORE requirement matches 1.8 V; otherwise use TPS65178RSLT |
| TPS65179RSLT | Omits VCOM reference/gain circuitry and gamma buffer; adds second VCC rail and enhanced sequencing | Designed for simpler panels lacking gamma tuning or dynamic VCOM needs | Choose TPS65178RSLT when gamma correction, VCOM gain, or 6-channel buffering is required; TPS65179RSLT suits cost-optimized designs |
Compared with TPS65178ARSLT and TPS65179RSLT, the TPS65178RSLT uniquely delivers 1.0-V VCORE default, full 6-channel gamma DACs, and integrated VCOM reference with dynamic gain - making it the only option for mid-tier LCD TVs requiring precise grayscale control and thermal-stable gate bias.
Availability
TPS65178RSLT is available at Aetrix Electronics and suitable for LCD TV panel power, TFT-LCD monitor biasing, and industrial HMI display applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS65178RSLT 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 experience in display power solutions.
The TPS65178 product line was designed specifically for cost-sensitive, high-resolution LCD TV and monitor panels requiring integrated gamma buffering, programmable VCOM, and thermally compensated gate drivers - all in a compact QFN package.
FAQ
What is the default VCORE voltage setting for the TPS65178RSLT?
The TPS65178RSLT has a factory-default VCORE output voltage of 1.0 V, programmable via I²C across 0.9 V to 2.4 V in 100-mV steps. This differs from the TPS65178ARSLT variant, which defaults to 1.8 V. The TPS65178RSLT datasheet specifies ±3% output accuracy at 1.0 V under 500-mA load.
Does the TPS65178RSLT support temperature compensation for VGH?
Yes, the TPS65178RSLT supports temperature compensation for VGH using an external thermistor network connected to the TCOMP pin. It provides two programmable VGH ranges - low-temperature (19 V to 34 V) and high-temperature (17 V to 32 V) - enabling automatic adjustment across –40°C to 85°C ambient.
How many gamma reference outputs does the TPS65178RSLT provide, and what is their resolution?
The TPS65178RSLT provides six gamma reference outputs (GMA1 through GMA6), each with 9-bit resolution (512 steps). GMA1–GMA3 span VDD/2 to VDD; GMA4–GMA6 span 0 to VDD/2. This architecture supports full-panel grayscale calibration for 1080p and 4K LCD panels.
What package type and thermal characteristics does the TPS65178RSLT use?
The TPS65178RSLT 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 - optimized for PCB heat spreading and high-power density LCD bias applications.
Can the TPS65178RSLT be used without external inductors or flying capacitors?
No, the TPS65178RSLT requires external components: chip inductors for all four buck converters and the boost converter, plus flying and storage capacitors for both charge pumps. The datasheet specifies exact values (e.g., 10–22 µH for buck inductors, 220 nF flying caps) to ensure stability and efficiency.
TPS65178RSLT 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)
TPS65178RSLT FAQ
1.How can I place an order for TPS65178RSLT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65178RSLT 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 TPS65178RSLT reliable?
The price and inventory of TPS65178RSLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65178RSLT is usually 5 days.
3.What payment methods are accepted for TPS65178RSLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65178RSLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65178RSLT?
TPS65178RSLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65178RSLT 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 TPS65178RSLT?
For technical support, including TPS65178RSLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65178RSLT requirements.
6.How does Aetrix verify that TPS65178RSLT is sourced from the original manufacturer or authorized distributors?
All TPS65178RSLT 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 TPS65178RSLT meets industry standards.
7.What is the process for return or replacement of TPS65178RSLT?
All TPS65178RSLT units undergo pre-shipment inspection (PSI). If there is an issue with TPS65178RSLT, 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 TPS65178RSLT part is unused and in its original packaging.
Return procedure for TPS65178RSLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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