Texas Instruments TPS65142RTGR

Overview

TPS65142RTGR from Texas Instruments is a highly integrated LCD bias and WLED backlight power management IC for TFT-LCD panels. It integrates an AVDD boost converter (up to 16.5 V/1.8 A), dual charge pumps (VGH up to 32 V, VGL down to –14 V), six-channel WLED current sinks (25 mA per channel, 1000:1 PWM dimming), gate voltage shaping, LCD discharge, reset function, and a 150-mA unity-gain VCOM buffer - all in a single 32-pin WQFN package.

For engineers reviewing the TPS65142RTGR datasheet, TPS65142RTGR pinout, TPS65142RTGR application, or TPS65142RTGR equivalent, this device serves as a complete power solution for notebook and tablet LCD displays requiring tightly regulated multi-rail bias supplies, precise gate driver timing control, high-fidelity VCOM driving, and synchronized WLED dimming with minimal external components.

Technical Context

The TPS65142RTGR implements a fixed-off-time current-mode AVDD boost regulator with selectable 650 kHz or 1.2 MHz switching frequency, enabling stable operation across 2.3–6 V input while delivering up to 16.5 V at 1.8 A peak. Its dual charge pump architecture uses DRVP/DRVN drivers with internal PMOS/NMOS switches (rDS(ON) ≤ 20 Ω) to generate regulated positive (VGH) and negative (VGL) gate voltages with independent feedback loops (FBP/FBN) referenced to 1.24 V and 3.12 V respectively.

WLED backlight control employs a dedicated boost converter (VBAT input 4.5–24 V) driving six current-sink channels via IFB1–IFB6, each programmable via ISET (1.23 V reference) and supporting ±1% current matching. Gate voltage shaping is implemented through VGHM modulation using external RE resistor and VDPM capacitor, while XAO provides open-drain reset signaling synchronized to power sequencing.

Key Specifications

Pinout & Package

TPS65142RTGR is housed in a thermally enhanced 32-pin WQFN package (6.00 mm × 3.00 mm, 0.5 mm pitch) with exposed thermal pad (PGND). The package supports high-power dissipation (RθJA = 35.4 °C/W) and requires controlled-impedance PCB layout for SW, BL_SW, and VGHM nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65142RTGR, TPS65136RTVR reduces system cost but sacrifices VCOM drive strength and gate-shaping precision, while MAX16922ATI+ adds automotive robustness at the expense of LCD-optimized functions like VGHM modulation and 6-channel matching.

Availability

TPS65142RTGR is available at Aetrix Electronics and suitable for notebook PC TFT-LCD panels, tablet displays, industrial panel PCs, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for TPS65142RTGR 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 TPS65142RTGR belongs to TI's LCD bias and backlight PMIC product line, designed specifically to consolidate power rails, timing control, and image quality enhancement functions for high-resolution TFT-LCD panels in portable and industrial applications.

FAQ

What is the maximum output voltage of the AVDD boost converter in the TPS65142RTGR?

The TPS65142RTGR AVDD boost converter delivers up to 16.5 V output, with overvoltage protection triggering between 16.9 V and 19 V. This voltage powers source driver ICs and supplies the internal SUP rail. The actual setpoint is determined by the external FB resistor divider, referencing a precise 1.24 V internal bandgap. The TPS65142RTGR maintains regulation across load currents up to 1.8 A peak with <0.15%/A load regulation.

How does the TPS65142RTGR implement gate voltage shaping for improved image quality?

The TPS65142RTGR implements gate voltage shaping via the VGHM output, which dynamically modulates the VGH rail using two internal PMOS switches (M1/M2) controlled by VFLK and VDPM. An external resistor (RE) sets the current source for VDPM, while an external capacitor (CVDPM) determines the ramp time. This creates a controlled VGH rise/fall profile that minimizes charging delay and reduces image flicker - a key requirement for high-refresh-rate TFT-LCD panels. The TPS65142RTGR datasheet specifies typical RE = 80 kΩ and CVDPM = 100 nF for standard timing.

Can the TPS65142RTGR drive more than six WLED strings?

No, the TPS65142RTGR integrates exactly six dedicated current-sink channels (IFB1–IFB6), each rated for up to 25 mA with better than ±1% matching. It does not support expansion beyond six strings. For displays requiring more than six strings, multiple TPS65142RTGR devices must be synchronized using shared DCTRL and EN signals, or a higher-channel alternative like the TPS65132 (8-channel) should be evaluated. The TPS65142RTGR's 1000:1 PWM dimming and current matching are optimized for its native 6-channel configuration.

What is the role of the XAO pin in the TPS65142RTGR power sequencing?

The XAO pin on the TPS65142RTGR is an open-drain reset output that pulls low during power-on and power-off transitions to ensure proper reset of the timing controller (TCON) and gate driver ICs. It activates when VIN crosses its UVLO threshold (2.2 V rising) and deactivates after a controlled delay. The TPS65142RTGR guarantees clean, monotonic reset assertion with 1 mA sink capability, eliminating race conditions in multi-rail LCD power-up sequences. External pull-up is required per application schematics.

Does the TPS65142RTGR include thermal protection, and what is its trip point?

Yes, the TPS65142RTGR includes integrated thermal shutdown protection that triggers at a junction temperature of 150 °C (typical), with 14 °C hysteresis to prevent oscillation. When activated, the device disables all switching regulators and enters a low-quiescent state until temperature falls below 136 °C. This protection safeguards against sustained overload, poor heatsinking, or ambient overheating. The TPS65142RTGR's 32-pin WQFN package (RTG) features an exposed thermal pad (PGND) to enhance heat dissipation, achieving RθJA = 35.4 °C/W under standard JEDEC conditions.