Texas Instruments TPS54383PWPR

Overview

TPS54383 from Texas Instruments is a dual-output, non-synchronous buck converter IC with integrated 85-mΩ high-side MOSFETs per channel, operating at a fixed 300 kHz switching frequency across a 4.5–28 V input range and delivering up to 3 A per output. It features independent enable pins (EN1/EN2), 0.8-V ±1.5% reference, 2.1-ms internal soft-start, and 180° out-of-phase PWM outputs for reduced input ripple-used in digital TV power rails requiring tightly sequenced dual supplies.

For engineers reviewing the TPS54383 datasheet, TPS54383 pinout, TPS54383 application, or TPS54383 equivalent, key selection considerations include its dual-channel current-mode control architecture, three-level overcurrent protection on Channel 2 (via ILIM2 pin), ratiometric or sequential startup (via SEQ pin), thermal shutdown at +148°C, and HTSSOP-14 PowerPAD™ package with exposed thermal pad.

Technical Context

The TPS54383 implements current-mode control with internal slope and loop compensation, eliminating external compensation components. Its dual PWM channels operate 180° out of phase using a single oscillator running at 600 kHz (2× 300 kHz), reducing input capacitor RMS current.

Channel 1 uses fixed 4.5-A overcurrent protection, while Channel 2 supports selectable trip thresholds (1.5 A, 3.0 A, or 4.5 A) via ILIM2 pin connection to GND, BP, or floating-enabling asymmetric load optimization. Startup sequencing (ratiometric, Output1-first, or Output2-first) is controlled solely by the SEQ pin state, with no external timing components required.

Key Specifications

Pinout & Package

TPS54383 is housed in a 14-pin HTSSOP (PWP) package with 4.40 mm × 5.00 mm body size and an exposed thermal pad on the bottom side, requiring direct connection to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54386PWPR, the TPS54383PWPR delivers higher efficiency at 3-A loads due to lower 300-kHz switching loss, while LM27402SQ/NOPB provides design flexibility at the cost of added components and tuning effort-making TPS54383PWPR optimal for cost-sensitive, production-ready dual-rail consumer power designs.

Availability

TPS54383PWPR is available at Aetrix Electronics and suitable for digital television, set-top box, DSP processor board, consumer audio/video system, and industrial embedded control applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across manufacturing lots.

Supply support for TPS54383PWPR 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 headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and silicon technologies for industrial, automotive, and consumer markets.

The TPS54383 belongs to TI's SWIFT™ family of integrated DC-DC converters, engineered specifically for high-density, low-component-count power solutions in space-constrained consumer electronics and digital video equipment.

FAQ

What is the switching frequency of the TPS54383PWPR?

The TPS54383PWPR operates at a fixed 300 kHz switching frequency. This value is internally determined and not adjustable. The oscillator runs at 600 kHz (2× the switching frequency) to generate complementary 180° out-of-phase PWM signals for the two channels. This frequency balances magnetic size, efficiency, and EMI performance for 3-A dual-output applications.

How does the SEQ pin configure startup sequencing on the TPS54383PWPR?

The SEQ pin on the TPS54383PWPR selects startup mode: tied to BP enables Output 2–then–Output 1 sequential startup (~400 μs delay); tied to GND enables Output 1–then–Output 2; left floating configures ratiometric startup where both outputs begin soft-start simultaneously and reach regulation at the same time. The TPS54383PWPR does not require external timing components for any mode.

What are the overcurrent protection options for Channel 2 of the TPS54383PWPR?

Channel 2 overcurrent protection on the TPS54383PWPR is selectable via the ILIM2 pin: connecting ILIM2 to GND sets the trip threshold to 1.5 A, leaving it floating sets 3.0 A, and connecting it to BP sets 4.5 A. These discrete levels allow designers to scale output inductors and capacitors for asymmetric loads-for example, using a smaller inductor on Channel 2 when powering a low-current peripheral rail.

Does the TPS54383PWPR require external compensation components?

No, the TPS54383PWPR includes fully internal loop compensation for both channels. Its current-mode control architecture integrates slope compensation and transconductance error amplifiers with fixed compensation networks, eliminating the need for external RC networks or type-II/type-III compensators. Designers select only the output LC filter components per the Feedback Loop and L-C Filter Selection guidelines in the datasheet.

What thermal management requirements apply to the TPS54383PWPR in HTSSOP-14 package?

TPS54383PWPR requires the exposed thermal pad on the HTSSOP-14 package to be soldered directly to a solid PCB ground plane. TI specifies 48.6°C/W junction-to-ambient thermal resistance with standard JEDEC 2S2P layout. For continuous 3-A operation at +70°C ambient, ≥2 in² of 2-oz copper connected to the thermal pad is recommended. Thermal shutdown activates at +148°C with 20°C hysteresis.