Texas Instruments TPS54292PWPR

Overview

TPS54292PWPR from Texas Instruments is a dual-output, fully synchronous buck converter IC integrating two independent PWM channels (1.5-A CH1 and 2.5-A CH2), operating from 4.5 V to 18 V input, with 1.2-MHz fixed switching frequency, 0.8-V ±1% reference, and 180° out-of-phase operation for reduced input ripple. It targets high-density power rails in digital TVs and set-top boxes.

For engineers reviewing the TPS54292PWPR datasheet, TPS54292PWPR pinout, TPS54292PWPR application, or TPS54292PWPR equivalent, key selection considerations include per-channel enable control (EN1/EN2), external compensation via COMP1/COMP2, dual 0.8-V feedback inputs (FB1/FB2), thermal shutdown at 145°C, and HTSSOP-16 PowerPAD™ package layout requirements.

Technical Context

The TPS54292PWPR implements current-mode control with internal slope compensation, using separate transconductance error amplifiers (g_M = 325 µS typ.) and dedicated soft-start ramps per channel. Its 2.4-MHz oscillator is divided by 2 to yield 1.2 MHz, enabling compact magnetics and low output voltage ripple.

Each channel features independent high-side (R_DS(on) = 265 mΩ CH1 / 190 mΩ CH2) and low-side (R_DS(on) = 190 mΩ CH1 / 150 mΩ CH2) MOSFETs, integrated bootstrap switches (R_BOOT = 33 Ω), and pulse-by-pulse overcurrent protection (2.2 A CH1 / 3.8 A CH2). Input UVLO monitors PVDD2 (4.1 V turn-on, 460 mV hysteresis).

Key Specifications

Pinout & Package

TPS54292PWPR uses a 16-pin HTSSOP (PWP) package with exposed thermal pad (5.00 mm × 4.40 mm nominal body size), requiring solder connection of the thermal pad to a dedicated PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual synchronous buck converter applications.

Compared with TPS54291PWPR, the TPS54292PWPR delivers 2× higher switching frequency for smaller passives and tighter transient response, while TPS54283PWPR trades integration for cost-requiring external diodes, increasing board area and thermal management complexity.

Availability

TPS54292PWPR is available at Aetrix Electronics and suitable for digital TV power supplies, set-top box core rails, DSP processor supplies, consumer audio SoC supplies, and FPGA power sequencing requiring stable component supply and long-term production continuity.

Supply support for TPS54292PWPR 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 specializing in analog and embedded processing technologies, with leadership in power management ICs for consumer, industrial, and automotive markets.

The TPS5429x product line was designed specifically for space-constrained, high-efficiency dual-rail applications in digital consumer electronics, emphasizing integration, thermal performance, and ease of layout with the HTSSOP PowerPAD™ package.

FAQ

What is the maximum duty cycle supported by the TPS54292PWPR?

The TPS54292PWPR supports a maximum duty cycle of 78% to 82%, depending on input voltage and temperature. This limit ensures reliable operation of the internal high-side MOSFETs and prevents shoot-through during switching transitions. The value is specified in the Electrical Characteristics table under DMAX and is validated across the full –40°C to 125°C junction temperature range. Designers must verify that V_OUT/V_IN ≤ D_MAX for their operating conditions to maintain regulation.

Does the TPS54292PWPR require external bootstrap diodes?

No, the TPS54292PWPR does not require external bootstrap diodes. It integrates internal bootstrap switches for both channels (BOOT1 and BOOT2), which charge the external bootstrap capacitors (22–68 nF) during the low-side FET conduction period. This eliminates discrete diodes, reduces component count, and improves reliability. The internal switch has a typical on-resistance of 33 Ω, and a small series resistor (2–5 Ω) may be added to slow down high-side turn-on if needed for EMI optimization.

How is thermal performance affected by the PowerPAD™ connection in the TPS54292PWPR?

Proper soldering of the TPS54292PWPR's exposed thermal pad to a solid PCB ground plane is essential for thermal performance. With correct thermal pad connection, the device achieves a junction-to-board thermal resistance (R_θJB) of 22.3°C/W, enabling full 1.5-A/2.5-A output capability at ambient temperatures up to 70°C without forced airflow. An unconnected or undersized thermal pad increases R_θJB significantly, risking thermal shutdown at much lower loads. TI recommends minimum 4 thermal vias (0.3-mm diameter) connecting the pad to an inner ground plane.

Can the TPS54292PWPR operate with only one channel enabled?

Yes, the TPS54292PWPR supports single-channel operation. Either EN1 or EN2 can be pulled low to enable its respective channel while the other remains disabled (ENx > 1.5 V). When only one channel operates, the unused channel's high- and low-side FETs remain fully off, contributing negligible quiescent current. The BP regulator remains active, and the 1.2-MHz oscillator continues running, but only the enabled channel generates PWM. This mode is commonly used for partial-power states or asymmetric rail requirements.

What is the purpose of the BP pin on the TPS54292PWPR?

The BP pin on the TPS54292PWPR provides a regulated 5.2-V supply (4.5–5.6 V range) used internally to power the bootstrap circuits, gate drivers, and bias networks. It must be bypassed to GND with a low-ESR ceramic capacitor (minimum 4.7 µF, 10 µF recommended) to stabilize the regulator and supply transient current during switching events. Failure to properly bypass BP can cause erratic BOOTx voltage, leading to high-side FET misfiring or complete loss of regulation. The BP regulator draws up to 25 mA under short-circuit conditions.