Texas Instruments TPS65124RGTRG4

Overview

TPS65124RGTRG4 from Texas Instruments is a single-inductor quadruple-output DC-DC converter for a-Si and LTPS TFT-LCD displays, delivering independently regulated VMAIN (3.0–5.3 V/25 mA), VGH (up to +20 V/2 mA), VGL (down to −18 V/2 mA), and programmable power sequencing via ENVGH/ENVGL pins. It operates from 2.7–5.5 V input and achieves up to 83% core efficiency at 4 MHz switching frequency.

For engineers reviewing the TPS65124RGTRG4 datasheet, TPS65124RGTRG4 pinout, TPS65124RGTRG4 application, or TPS65124RGTRG4 equivalent, key selection criteria include its programmable gate-drive sequencing, post-regulated low-ripple VMAIN (5 mV_P-P), ±0.8% main output accuracy, and QFN-16 (3 × 3 × 0.9 mm) package with exposed thermal pad.

Technical Context

The TPS65124RGTRG4 uses a free-running variable peak-current PWM control scheme to time-multiplex a single inductor across BOOT, VGH, and VGL outputs, enabling pseudo-fixed-frequency operation at 4 MHz. Its architecture supports fast transient response while maintaining high efficiency across wide input (2.7–5.5 V) and output voltage ranges.

It integrates programmable enable logic for VGH and VGL via dedicated ENVGH and ENVGL pins, allowing independent control of gate-driver power-up/down order. The VMAIN output is post-regulated by an internal LDO to achieve 5 mV_P-P ripple, with feedback regulation referenced to 1.213 V at FBM and FBH pins.

Key Specifications

Pinout & Package

TPS65124RGTRG4 is housed in a thermally enhanced 16-pin QFN package (3 mm × 3 mm × 0.9 mm) with an exposed die pad for improved heat dissipation. Pin numbering follows standard top-view orientation with Pin 1 marked by a dot.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TFT-LCD power management applications.

Compared with TPS65123RGT, TPS65124RGTRG4 provides design flexibility through independent ENVGH/ENVGL control, while TPS65132A1YFFR adds digital configurability at the cost of increased complexity and footprint-making TPS65124RGTRG4 optimal for cost-sensitive, sequencing-critical handheld displays.

Availability

TPS65124RGTRG4 is available at Aetrix Electronics and suitable for smartphone LCD power management, portable GPS display supply, and digital still camera backlight panel applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS65124RGTRG4 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 TPS6512x product line was designed specifically for space-constrained, battery-powered a-Si and LTPS TFT-LCD panels-emphasizing single-inductor efficiency, programmable sequencing, and ultra-low profile packaging.

FAQ

What is the primary function of the ENVGH and ENVGL pins on the TPS65124RGTRG4?

The ENVGH and ENVGL pins on the TPS65124RGTRG4 provide independent logic-level enable control for the VGH and VGL outputs, respectively. Unlike earlier variants (e.g., TPS65120), this enables fully programmable power-up and power-down sequencing-critical for preventing gate oxide damage in TFT-LCD panels. Each pin must be actively driven (not left floating) to ensure stable operation.

Does the TPS65124RGTRG4 include an integrated linear regulator for logic supply?

No, the TPS65124RGTRG4 does not integrate a fixed auxiliary LDO like the TPS65120/121/123. It omits the LDOIN/LDOOUT pins entirely and relies on external logic supplies. This simplifies the die and reduces quiescent current, making it ideal for designs where the timing controller's logic voltage is provided separately.

What is the maximum achievable VMAIN output voltage and its associated current limit?

The TPS65124RGTRG4 supports a VMAIN output range of 3.0 V to 5.3 V. At VMAIN ≤ 5.3 V, the maximum continuous output current is 25 mA; above 5.3 V, the current limit drops to 7.5 mA. This is enforced by the internal LDO stage, which also ensures ≤5 mV_P-P ripple and ±0.8% regulation accuracy at the FBM feedback node.

How does the TPS65124RGTRG4 achieve low output ripple on the VMAIN rail?

The TPS65124RGTRG4 achieves ≤5 mV_P-P VMAIN ripple through post-regulation: the switching stage first generates a BOOST voltage (VMAIN + ~0.5 V), then feeds it into an integrated low-dropout linear regulator. This LDO filters high-frequency switching noise, eliminating the need for large external ceramic capacitors or ferrite beads in noise-sensitive display applications.

What package type and thermal characteristics does the TPS65124RGTRG4 use?

The TPS65124RGTRG4 uses a 16-pin QFN package (3 mm × 3 mm × 0.9 mm) with an exposed thermal die pad. Its thermal resistance is R_θJA = 68°C/W, and it supports derating of 15 mW/°C above 25°C ambient. The exposed pad must be soldered to a thermal plane on the PCB to maintain junction temperature below 135°C under full load.