Texas Instruments TPS65178RSLR

Overview

TPS65178RSLR 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, 6-channel gamma buffer, boost converter (VDD: 12.8–19 V/800 mA), synchronous buck converters (VCC: 3.0–3.7 V/2.0 A; VCORE: 0.9–2.4 V/500 mA; HVDD: VDD/2/500 mA; VEPI: 0.9–2.4 V/100 mA), positive/negative charge pumps (VGH: 17–34 V/100 mA; VGL: –1.8 to –8.1 V/100 mA), and I²C interface. It powers TFT-LCD panels in high-resolution LCD TVs.

For engineers reviewing the TPS65178RSLR datasheet, TPS65178RSLR pinout, TPS65178RSLR application, or TPS65178RSLR equivalent, this device supports programmable sequencing delays (3 × 3-bit), temperature-compensated VGH via external thermistor, 48-pin QFN package (6 mm × 6 mm), and non-volatile configuration storage - critical for panel-specific tuning in mass production of LCD TV power systems.

Technical Context

The TPS65178RSLR implements a multi-rail power architecture with four synchronous buck converters (VCORE default = 1.0 V), one boost converter, dual charge pumps, and analog gamma/VCOM circuitry. All output voltages except HVDD are digitally programmable via I²C using 3- to 9-bit resolution, enabling precise panel voltage calibration without hardware changes.

Its thermal compensation for VGH uses an external NTC thermistor on TCOMP pin to switch between low/high-temperature VGH ranges (e.g., 28 V at –2°C → 22 V at 25°C). Sequencing is controlled by three independent 3-bit delay registers (DLY1–DLY3), each configurable in 5-ms steps up to 35 ms, ensuring safe power-up order across VDD, HVDD, VGH, VGL, VCOM, and logic rails.

Key Specifications

Pinout & Package

TPS65178RSLR is housed in a thermally enhanced 48-pin QFN package (6 mm × 6 mm, 0.4 mm pitch) with exposed PowerPAD™ for improved thermal dissipation (θJCbot = 1.7 °C/W). Pin functions are validated per TI SLVSAP8D datasheet Rev. July 2012.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LCD bias IC applications.

Compared with TPS65178ARSLR and TPS65179RSLR, the TPS65178RSLR uniquely combines full gamma/VCOM functionality with 1.0 V VCORE default and thermistor-based VGH compensation - making it the only option for cost-sensitive, high-fidelity LCD TV panels requiring factory-programmable bias tuning.

Availability

TPS65178RSLR is available at Aetrix Electronics and suitable for large-screen LCD TV power management, TFT-LCD panel bias supply, and thermally adaptive gate driver bias applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS65178RSLR 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 TPS65178 product line was designed specifically for high-efficiency, programmable LCD bias in consumer TV and monitor applications - integrating gamma, VCOM, charge pumps, and multi-rail DC/DC into a single QFN package.

FAQ

What is the default VCORE output voltage for TPS65178RSLR?

The TPS65178RSLR has a factory-default VCORE output voltage of 1.0 V, as specified in TI's ordering information table. This differs from the TPS65178A variant, which defaults to 1.8 V. The voltage is programmable via I²C across 0.9 V to 2.4 V in 100-mV steps, but the power-on reset value remains 1.0 V for TPS65178RSLR unless reconfigured.

Does TPS65178RSLR support temperature compensation for VGH?

Yes, the TPS65178RSLR supports temperature compensation for VGH using an external NTC thermistor network connected to the TCOMP pin. It switches between two programmable VGH ranges - low-temperature (e.g., 28 V) and high-temperature (e.g., 22 V) - based on thermistor resistance, enabling stable gate drive across –40°C to 85°C ambient.

How many gamma voltage outputs does TPS65178RSLR provide, and what is their resolution?

The TPS65178RSLR provides six independent gamma voltage outputs (GMA1–GMA6), each implemented as a 9-bit DAC with ±0.6 LSB integral nonlinearity. GMA1–GMA3 span VDD/2 to VDD; GMA4–GMA6 span 0 V to VDD/2 - enabling full grayscale voltage ladder generation for high-end LCD panels.

What package type and thermal characteristics does TPS65178RSLR use?

The TPS65178RSLR uses a 48-pin QFN package (6 mm × 6 mm, 0.4 mm pitch) with exposed PowerPAD™ thermal pad. Its junction-to-board thermal resistance (θJB) is 5.3 °C/W, and junction-to-case (bottom) resistance (θJCbot) is 1.7 °C/W, enabling efficient heat transfer to the PCB for sustained 2.0 A VCC and 500 mA VCORE operation.

Can TPS65178RSLR store configuration settings permanently?

Yes, the TPS65178RSLR includes on-chip non-volatile memory that retains all programmable settings - including output voltages, sequencing delays (DLY1–DLY3), VCOM gain modes, and gamma DAC values - after power cycle. This allows a single hardware design to support multiple LCD panel types via firmware-defined configurations.