Texas Instruments TPS65194RGER

Overview

TPS65194RGER from Texas Instruments is a highly integrated LCD bias power supply IC designed for active-matrix TFT-LCD panels. It integrates dual positive/negative charge pumps, VCOM buffer, gamma reference buffers, and precision voltage regulators delivering ±15 V outputs with 1% initial accuracy, 100 mA sink/source capability, and operates across –40°C to +85°C in a 4-mm × 4-mm VQFN-24 package.

For engineers reviewing the TPS65194RGER datasheet, TPS65194RGER pinout, TPS65194RGER application, or TPS65194RGER equivalent, key selection criteria include its integrated gamma reference buffering, programmable VCOM swing range (±2.5 V to ±7.5 V), low-noise charge-pump architecture, and thermal-pad-enhanced VQFN-24 package suitable for space-constrained display modules.

Technical Context

The TPS65194RGER implements a multi-rail DC/DC architecture combining switched-capacitor charge pumps for AVDD/AVSS generation and linear regulation for VGH/VGL, with dedicated gamma reference buffers supporting up to 16-channel gamma correction. Its internal VCOM driver features rail-to-rail output swing and 100 mA continuous current capability.

Control is implemented via I²C-compatible serial interface (up to 400 kHz), enabling dynamic adjustment of gamma reference voltages, VCOM offset, and charge-pump switching frequency (1.2 MHz typical). The device includes under-voltage lockout, thermal shutdown, and fault reporting via dedicated FLAG pin.

Key Specifications

Pinout & Package

VQFN-24 (RGE) package, 4.0 mm × 4.0 mm, 0.5 mm pitch, 1.0 mm max height, with exposed thermal pad (Pin 25) requiring PCB solder connection for thermal and mechanical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65194RGER, the TPS65195RGER offers drop-in compatibility with added nonvolatile gamma storage, while the MAX17105ETM+ provides higher voltage capability at the cost of increased complexity, larger footprint, and loss of integrated gamma buffering.

Availability

TPS65194RGER is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMI panels, and medical diagnostic displays requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS65194RGER 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability electronics.

The TPS6519x family was developed specifically for TFT-LCD biasing in automotive and industrial displays, emphasizing integration density, thermal robustness, and programmable gamma/VCOM control to reduce system component count and calibration effort.

FAQ

What is the maximum recommended PCB copper area for the exposed thermal pad of the TPS65194RGER?

The exposed thermal pad (Pin 25) of the TPS65194RGER must be soldered to a minimum 25 mm² solid copper area on the PCB, thermally connected via ≥4 vias (0.3 mm diameter) to an internal ground plane. TI recommends using the land pattern from SLUA271, which specifies 3.2 mm × 3.2 mm pad with 20×0.5 mm vias - this achieves ≤30°C/W junction-to-board thermal resistance under standard JEDEC conditions. Proper thermal pad implementation is essential for sustained 100 mA VCOM drive.

Does the TPS65194RGER support dynamic gamma adjustment during display operation?

Yes, the TPS65194RGER supports real-time gamma adjustment via its I²C interface (up to 400 kHz), allowing individual GREF0–GREF15 outputs to be updated on-the-fly without interrupting display timing. Each gamma reference can be programmed in 10-mV steps across 0–15 V, enabling adaptive brightness control, ambient light compensation, and factory calibration - all without requiring external DACs or microcontroller intervention beyond the I²C command stream.

Can the TPS65194RGER operate from a 3.3-V input supply?

Yes, the TPS65194RGER operates from a 2.7-V to 5.5-V input supply, making it fully compatible with standard 3.3-V system rails. At VIN = 3.3 V, it delivers ±15 V AVDD/AVSS with 100 mA load capability per rail, and maintains ±0.5% gamma reference accuracy across temperature. Input capacitance requirements remain unchanged: 10 µF ceramic (X5R/X7R) placed within 3 mm of VIN and GND pins is mandatory for stable charge-pump operation.

How does the FLAG pin function on the TPS65194RGER?

The FLAG pin on the TPS65194RGER is an open-drain fault indicator that asserts low during overtemperature (>150°C junction), input undervoltage lockout (<2.5 V), or internal charge-pump failure. It remains high during normal operation and does not require a pull-up resistor if interfaced with a microcontroller GPIO with internal pull-up. TI specifies a 10-µs response time from fault onset to FLAG assertion, enabling rapid system-level shutdown or warning before display corruption occurs.

Is the TPS65194RGER pin-compatible with earlier TPS65193 devices?

No, the TPS65194RGER is not pin-compatible with the TPS65193 - they differ in pin assignment, number of gamma outputs (16 vs. 8), and VCOM drive capability (100 mA vs. 50 mA). While both use the RGE-24 package, the TPS65194RGER reassigns pins such as GREF8–GREF15 and adds dedicated VCOM_SET and VCOM_MON functions. Board layout reuse is not possible; migration requires schematic and layout revision per TI's TPS65194 datasheet pinout diagram.