Texas Instruments TPS65131RGETG4

Overview

TPS65131RGETG4 from Texas Instruments is a dual-output DC-DC converter IC generating independent positive (up to +15 V) and negative (down to –15 V) rails from a 2.7–5.5 V input, with 2 A switch current limit on both outputs, 1.25–1.5 MHz fixed-frequency PWM control, and 1 µA shutdown current. It serves as a compact split-rail power supply for LCD/AMOLED display bias in portable industrial HMIs and test equipment.

For engineers reviewing the TPS65131RGETG4 datasheet, TPS65131RGETG4 pinout, TPS65131RGETG4 application, or TPS65131RGETG4 equivalent, key selection considerations include verified ±15 V adjustability, independent enable sequencing (ENP/ENN), integrated overvoltage/thermal protection, and VQFN-24 (4 mm × 4 mm) package compatibility with high-density PCB layouts.

Technical Context

The TPS65131RGETG4 implements two independent fixed-frequency PWM regulators: a boost converter for VPOS and an inverting buck-boost for VNEG, sharing only a common oscillator and 1.213 V internal reference. Each stage uses feedforward control monitoring VIN, output voltage, and switch R_DS(ON) to dynamically adjust duty cycle without relying solely on slow error amplifiers.

It supports flexible power management via separate ENP/ENN pins for sequencing, PSP/PSN pins to select continuous-conduction or pulse-skipping power-save mode per rail, and BSW pin to drive an external P-channel FET for full battery disconnect-critical for low-quiescent systems requiring zero-load leakage.

Key Specifications

Pinout & Package

TPS65131RGETG4 is housed in a thermally enhanced 4-mm × 4-mm VQFN-24 package (RGE) with exposed thermal pad. Pin numbering follows standard top-view orientation; AGND and PGND are separate analog and power ground connections to minimize noise coupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output DC-DC converter applications.

Compared with TPS65131RGETG4, TPS65130RGET offers identical functionality at reduced current capability-ideal for cost-sensitive, lower-power designs-while MAX17504ATP+T provides wider input range but demands extra components and forfeits integrated battery disconnect and sequencing control.

Availability

TPS65131RGETG4 is available at Aetrix Electronics and suitable for industrial HMI displays, portable test equipment, differential audio amplifiers, and factory automation I/O modules requiring stable component supply across extended temperature and long production lifecycles.

Supply support for TPS65131RGETG4 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 ICs, with decades of expertise in high-reliability power conversion solutions.

The TPS6513x product line was designed specifically for compact, efficient split-rail bias generation in portable and industrial display systems-emphasizing low quiescent current, independent rail control, and robust fault protection.

FAQ

What is the maximum adjustable output voltage of the TPS65131RGETG4 positive rail?

The TPS65131RGETG4 positive output (VPOS) is adjustable up to +15 V, as specified in the Recommended Operating Conditions and Electrical Characteristics tables. This limit is enforced by internal overvoltage protection that triggers at approximately +17 V. The actual setpoint depends on the external resistor divider connected to the FBP pin, with regulation accuracy maintained at ±3% across temperature and load.

Does the TPS65131RGETG4 support independent power sequencing between its positive and negative outputs?

Yes, the TPS65131RGETG4 supports independent sequencing via dedicated enable pins: ENP (Pin 8) controls the VPOS boost converter, and ENN (Pin 10) controls the VNEG inverting converter. Applying logic HIGH to either pin initiates soft-start for that rail only, allowing staggered power-up-for example, enabling VNEG before VPOS to prevent latch-up in display driver ICs. Both rails operate independently under all conditions.

What is the purpose of the BSW pin on the TPS65131RGETG4, and how is it used?

The BSW (Pin 7) on the TPS65131RGETG4 is a gate-control output that drives an external P-channel MOSFET to fully disconnect the load from the input source when the boost converter is disabled. Unlike the inverting rail-which inherently blocks current flow when off-the boost rail's rectifier diode creates a leakage path. BSW goes LOW when ENP = HIGH and HIGH when ENP = LOW, enabling true zero-quiescent battery isolation in portable systems.

How does the TPS65131RGETG4 achieve high efficiency at light loads?

The TPS65131RGETG4 achieves high light-load efficiency via configurable power-save mode: setting PSP (Pin 9) or PSN (Pin 11) HIGH enables pulse-skipping operation for the respective rail, reducing switching losses. In this mode, the controller delivers only the energy needed to maintain regulation, dropping quiescent current to 100–120 µA per rail while sustaining output accuracy. This is distinct from forced-PWM mode, which maintains fixed frequency regardless of load.

Can the TPS65131RGETG4 be used with a 3.3 V input supply, and what output currents are supported?

Yes, the TPS65131RGETG4 operates across 2.7–5.5 V input, including standard 3.3 V rails. At VIN = 3.6 V, typical maximum output currents are ~1.8 A for VPOS and ~900 mA for VNEG (per Figure 6-2 and Figure 6-4), scaling with input-to-output voltage ratio. These values assume proper external component selection (e.g., 4.7 µH inductors, low-ESR capacitors) and adequate PCB thermal design per the RθJB = 12.2°C/W specification.