Texas Instruments TPS54623RHLT

Overview

TPS54623RHLT from Texas Instruments is a 4.5-V to 17-V input, 6-A synchronous step-down DC/DC converter in thermally enhanced VQFN-14 package, integrating 26 mΩ high-side and 19 mΩ low-side MOSFETs, featuring 200 kHz–1.6 MHz adjustable switching frequency, 0.6 V ±1% reference, and hiccup-mode overcurrent protection. It delivers high-density point-of-load regulation for telecom and networking infrastructure.

For engineers reviewing the TPS54623RHLT datasheet, TPS54623RHLT pinout, TPS54623RHLT application, or TPS54623RHLT equivalent, key selection considerations include light-load pulse-skipping efficiency, monotonic start-up into pre-biased outputs, split-rail PVIN/VIN operation (1.6 V–17 V), power-good monitoring with ±2% OV/UVP thresholds, and thermal hiccup shutdown at 160°C–175°C.

Technical Context

The TPS54623RHLT implements constant-frequency peak-current-mode control with integrated slope compensation to prevent subharmonic oscillation across 0–100% duty cycle. Its dual-input architecture separates control logic supply (VIN: 4.5–17 V) from power switch rail (PVIN: 1.6–17 V), enabling low-voltage biasing in distributed systems.

Protection includes cycle-by-cycle high-side current limiting (8–14 A), bidirectional low-side sourcing/sinking limits (6.5–15 A / 200–600 mA), BOOT-PH UVLO (2.1–3 V), and thermal shutdown with 10°C hysteresis and 16384-cycle hiccup restart. The SS/TR pin enables programmable soft-start and voltage tracking via external capacitor.

Key Specifications

Pinout & Package

TPS54623RHLT uses a 3.5 mm × 3.5 mm thermally enhanced VQFN-14 package with exposed thermal pad (Pin 15) requiring solder 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 synchronous step-down converter applications.

Compared with TPS54623RHLT, the TPS54622RHLT offers identical layout compatibility but removes hiccup recovery-requiring external reset logic-while the MP2315DJ-LF-Z trades PVIN flexibility and tracking for higher input voltage range and lower unit cost, at the expense of light-load efficiency and precision sequencing.

Availability

TPS54623RHLT is available at Aetrix Electronics and suitable for high-density distributed power systems, high-performance point-of-load regulation, and broadband communications infrastructure requiring stable component supply and long-term manufacturability.

Supply support for TPS54623RHLT 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The TPS54623RHLT belongs to TI's SWIFT™ synchronous buck converter family, engineered for high-efficiency, high-current point-of-load applications in telecom, networking, and optical infrastructure where thermal performance and reliability are critical.

FAQ

What is the minimum input voltage supported by TPS54623RHLT on the PVIN pin?

The TPS54623RHLT supports PVIN down to 1.6 V, enabling use with intermediate bus voltages such as 1.8 V or 3.3 V in distributed power architectures. This split-rail capability allows the control circuitry (powered by VIN) to remain active while the power stage operates at lower input levels, improving system efficiency in multi-rail designs. The 1.6 V minimum is specified across –40°C to 150°C junction temperature.

Does TPS54623RHLT support synchronization to an external clock signal?

Yes, the TPS54623RHLT supports external clock synchronization via the RT/CLK pin. When driven with a TTL/CMOS-compatible clock signal, the device's internal PLL locks to the falling edge of the external clock, enabling precise timing alignment across multiple converters in noise-sensitive applications like RF front-ends or high-speed data converters. Frequency range is 200 kHz–1.6 MHz.

How does the hiccup overcurrent protection work in TPS54623RHLT?

The TPS54623RHLT triggers hiccup protection after 512 consecutive overcurrent cycles, then disables switching for 16384 cycles before attempting automatic restart. This limits average fault power and prevents thermal runaway during sustained shorts. Unlike latched shutdown, hiccup mode enables autonomous recovery once the fault clears, reducing system downtime in field-deployed telecom equipment where manual reset is impractical.

Can TPS54623RHLT start up safely into a pre-biased output?

Yes, the TPS54623RHLT guarantees monotonic start-up into pre-biased outputs by disabling the low-side MOSFET until the SS/TR pin voltage exceeds 1.4 V. This prevents reverse current flow from the output capacitor into the converter during hot-plug events or multi-rail sequencing, protecting downstream components and ensuring predictable power-up behavior in complex systems like optical line cards.

What is the purpose of the dual PH pins (11 and 12) on TPS54623RHLT?

The TPS54623RHLT features two PH pins (11 and 12) to reduce parasitic inductance and resistance in the high-current switch node path. Each pin carries half the 6-A peak switching current, lowering total conduction loss and thermal stress at the package interface. This dual-pin configuration improves efficiency by ~0.5% at full load and enhances thermal performance in compact layouts where copper area is constrained.