Texas Instruments TPS65131RGET

Overview

TPS65131RGET 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, 89% (VPOS) and 81% (VNEG) peak efficiency, and integrated overvoltage/thermal/UVLO protection - used in AMOLED display power supplies for industrial HMI and medical devices.

For engineers reviewing the TPS65131RGET datasheet, TPS65131RGET pinout, TPS65131RGET application, or TPS65131RGET equivalent, key selection considerations include dual-rail sequencing control via ENP/ENN pins, external P-channel FET gate drive (BSW), 1.25–1.5 MHz fixed-frequency PWM operation, and VQFN-24 (4 mm × 4 mm) thermal performance with R_θJA = 34.1°C/W.

Technical Context

The TPS65131RGET 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), with self-learning error correction and internal compensation at FBP/FBN.

It supports flexible power sequencing via separate ENP and ENN inputs, individual power-save mode enable (PSP/PSN), and load disconnect via BSW-controlled external PMOS. Soft-start ramps switch current limit over ~1 ms to limit inrush, while OVP triggers immediate shutdown if feedback exceeds regulation by >5%.

Key Specifications

Pinout & Package

TPS65131RGET is housed in a thermally enhanced 4-mm × 4-mm VQFN-24 package (RGE) with exposed thermal pad. The package supports PCB-level heat dissipation via bottom-side copper connection and achieves R_θJB = 12.2°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65130RGET, the TPS65131RGET delivers 2.5× higher output current per rail for demanding display bias loads, while MAX17504ATP+ offers extended input range but requires external components and cannot replace the dual-rail functionality without adding a second converter.

Availability

TPS65131RGET is available at Aetrix Electronics and suitable for industrial HMI, medical imaging panels, test & measurement instrumentation, and portable audio amplifier designs requiring stable component supply and long-term production continuity.

Supply support for TPS65131RGET 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 high-reliability DC-DC conversion.

The TPS6513x product line was designed specifically for compact, efficient dual-rail power in portable and industrial displays - integrating positive boost and negative inverting functions with sequencing, protection, and thermal management in a single VQFN package.

FAQ

What is the maximum output current capability of the TPS65131RGET on each rail?

The TPS65131RGET supports up to 2 A switch current limit on both the VPOS (positive boost) and VNEG (negative inverting) outputs, as confirmed in Section 6.5 Electrical Characteristics of the datasheet. Actual deliverable output current depends on input voltage, output voltage setting, and thermal conditions - e.g., at VIN = 3.6 V and VPOS = 15 V, maximum continuous output is ~1.1 A (Figure 6-2). This distinguishes it from the TPS65130RGET, which is limited to 0.8 A per rail.

How does the BSW pin function in the TPS65131RGET, and what external component is required?

The BSW pin on the TPS65131RGET is an open-drain gate driver output that controls an external P-channel MOSFET placed in series with the boost converter's input path. When ENP is high, BSW pulls low to turn on the FET and enable VPOS; when ENP is low, BSW goes high-impedance, allowing the FET to turn off and fully disconnect the battery from the VPOS circuit. A typical choice is Vishay Si2323DS, as referenced in the datasheet's Table 8-2.

Can the TPS65131RGET generate non-symmetric output voltages, and how is this configured?

Yes, the TPS65131RGET supports fully independent VPOS and VNEG outputs - for example, +12 V and –5 V - using separate resistor dividers on FBP and FBN pins. Each feedback network references the internal 1.213 V bandgap, and output voltage is calculated as VOUT = 1.213 × (1 + R1/R2). The device does not require matched rails, enabling optimized biasing for display driver ICs or differential analog circuits.

What protection features are integrated into the TPS65131RGET, and how do they respond to faults?

The TPS65131RGET integrates overvoltage protection (OVP) on both VPOS and VNEG, input undervoltage lockout (UVLO) at ~2.35 V, and thermal shutdown at 150°C with 5°C hysteresis. OVP triggers immediate shutdown if feedback exceeds regulation by >5%; UVLO disables both converters when VIN drops below threshold but keeps control circuitry active; thermal shutdown halts operation until junction temperature falls below 145°C.

Is the TPS65131RGET pin-compatible with other devices in the TPS6513x family, and what are the key compatibility constraints?

Yes, the TPS65131RGET shares identical pinout, package (VQFN-24 RGE), and functional block diagram with TPS65130RGET. Key compatibility constraints include: (1) TPS65131RGET's 2 A current limit requires higher-current external components (e.g., 4.7 µH inductors rated ≥2.5 A), and (2) feedback resistor values must be reselected to maintain regulation accuracy under higher load - refer to Section 8.2.2.1 for divider design guidance.