Texas Instruments TPS54426PWP

Overview

TPS54426PWP from Texas Instruments is a 4-A synchronous step-down DC/DC converter with integrated 65 mΩ high-side and 55 mΩ low-side N-channel MOSFETs, D-CAP2™ adaptive on-time control, and Auto-Skip Eco-mode™ for light-load efficiency. It operates from 4.5 V to 18 V input, delivers 0.76 V to 5.5 V output, and features 700-kHz pseudo-fixed switching frequency-used in digital TV power supplies and Blu-ray disc player voltage regulation.

For engineers reviewing the TPS54426PWP datasheet, TPS54426PWP pinout, TPS54426PWP application, or TPS54426PWP equivalent, key selection considerations include its HTSSOP-14 PowerPAD™ package thermal performance, cycle-by-cycle overcurrent protection, pre-biased soft-start capability, and compatibility with ultra-low-ESR ceramic output capacitors without external compensation.

Technical Context

The TPS54426PWP implements D-CAP2™ mode control, combining adaptive on-time PWM with internal ramp compensation to achieve fast transient response and stability with ceramic output capacitors. Its on-time is inversely proportional to VIN and proportional to VOUT, enabling ~700 kHz operation across input voltage range without an external oscillator.

Eco-mode™ enables seamless transition from continuous conduction mode (CCM) at heavy loads to discontinuous conduction mode (DCM) at light loads, maintaining high efficiency down to microamp-level output currents. The device integrates VREG5 (5.5 V ±3%), power-good open-drain output, and internal output discharge MOSFET (50–100 Ω) for controlled shutdown.

Key Specifications

Pinout & Package

The TPS54426PWP uses a 14-pin HTSSOP package with exposed PowerPAD™ thermal pad (PWP suffix), designed for soldered thermal connection to PGND on PCB layer. Thermal resistance θ_JA = 55.6°C/W, θ_JCbot = 4.3°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54426PWP, TPS54428PWP offers higher current headroom but removes VREG5 integration, while MP2342DL-LF-Z sacrifices Eco-mode™ efficiency and advanced startup features for simpler control and lower unit cost-neither is pin-compatible nor drop-in.

Availability

TPS54426PWP is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray disc players, networking home terminals, and digital set-top boxes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS54426PWP 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-efficiency DC/DC conversion.

The TPS54426 belongs to TI's SWIFT™ synchronous buck converter family, engineered for space-constrained consumer and industrial applications demanding high efficiency, fast transient response, and minimal external components.

FAQ

What is the maximum output current capability of the TPS54426PWP?

The TPS54426PWP is rated for 4 A continuous output current under recommended operating conditions (T_A = –40°C to 85°C, proper PCB thermal design). Its current limit threshold is 4.7–7.5 A depending on temperature and test conditions, and it includes cycle-by-cycle overcurrent protection to safeguard against short-circuit events. Derating is required above 85°C ambient or with insufficient thermal vias on the PowerPAD™.

Does the TPS54426PWP support pre-biased output startup?

Yes, the TPS54426PWP includes proprietary pre-biased soft-start circuitry that prevents reverse current flow from the output during power-up. When the output voltage is already present before EN assertion, the controller incrementally enables the low-side FET gate drive on a cycle-by-cycle basis-ensuring smooth ramp-up without disrupting downstream circuitry. This feature is confirmed in the functional description and startup waveform figures of the SLVSAD6C datasheet.

What package type and thermal characteristics apply to the TPS54426PWP?

The TPS54426PWP uses a 14-pin HTSSOP package with PowerPAD™ (PWP suffix), featuring an exposed thermal pad on the underside. Its junction-to-ambient thermal resistance is 55.6°C/W, and junction-to-case (bottom) is 4.3°C/W. Reliable 4-A operation requires soldering the PowerPAD™ to a PGND plane with ≥6 thermal vias and minimizing trace inductance on VIN/PGND paths per TI layout guidelines.

Can the TPS54426PWP operate with ceramic output capacitors only?

Yes, the TPS54426PWP is explicitly designed for use with ultra-low-ESR ceramic output capacitors (e.g., 22 µF–68 µF X5R/X7R), enabled by its D-CAP2™ control architecture. Unlike traditional voltage-mode controllers, it does not require ESR-induced ripple for stability-eliminating the need for tantalum or polymer capacitors. The datasheet confirms stable operation with 22 µF ceramics and provides recommended values in Table 1.

What is the function of the VREG5 pin on the TPS54426PWP?

The VREG5 pin on the TPS54426PWP provides a regulated 5.5 V ±3% output (typical 5.5 V at 0–70 mA load), derived from VIN and used to power internal circuitry and optionally external bias rails. It requires a 1 µF ceramic capacitor to PGND and features line/load regulation of ≤20 mV/100 mV. VREG5 must remain above 3.8 V for normal operation, as it feeds the UVLO comparator-making it critical for system-level power sequencing.