Texas Instruments TPS54227DRCT

Overview

TPS54227DRCT from Texas Instruments is a 2-A synchronous step-down DC/DC converter with integrated high- and low-side N-channel MOSFETs, operating in D-CAP2™ adaptive on-time mode. It delivers regulated output voltages from 0.76 V to 7 V across a 4.5–18 V input range, features 700-kHz switching frequency, <10 μA shutdown current, and supports ceramic output capacitors. It is used in digital TV power supplies and networking home terminals.

For engineers reviewing the TPS54227DRCT datasheet, TPS54227DRCT pinout, TPS54227DRCT application, or TPS54227DRCT equivalent, key selection considerations include its D-CAP2 control architecture for fast transient response without external compensation, prebiased soft-start capability, cycle-by-cycle overcurrent protection, and thermal shutdown at 165°C - all critical for compact, high-efficiency point-of-load designs.

Technical Context

The TPS54227DRCT implements D-CAP2™ mode control, combining adaptive on-time PWM with internal ripple injection to enable stable operation with ultra-low-ESR ceramic output capacitors. Its control loop eliminates need for external compensation while maintaining pseudo-fixed 700-kHz switching frequency across input and load variations.

It integrates two N-channel MOSFETs (165 mΩ high-side, 108 mΩ low-side), uses VREG5 (5.5 V ±0.3 V) to power internal circuitry and bootstrap gate drive, and incorporates valley-current sensing for cycle-by-cycle overcurrent protection with non-latching thermal shutdown at 165°C and UVLO referenced to VREG5.

Key Specifications

Pinout & Package

TPS54227DRCT is housed in a 10-pin VSON package (3.0 mm × 3.0 mm) with exposed thermal pad on underside for enhanced thermal dissipation. The package is RoHS-compliant and designed for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54227DRCT, TPS54225PWP offers higher current and thermal headroom but requires redesign for bias supply and layout; MP2315DJ-LF-Z reduces BOM count but sacrifices transient performance and prebias capability - making TPS54227DRCT optimal for space-constrained, dynamically loaded consumer electronics.

Availability

TPS54227DRCT is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, digital set top boxes (STB), and high-definition Blu-ray Disc™ players requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS54227DRCT 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 TPS54227DRCT belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-efficiency, low-component-count DC/DC conversion in space- and thermally constrained consumer and industrial applications.

FAQ

What is the maximum recommended output current for the TPS54227DRCT?

The TPS54227DRCT is rated for 2-A continuous output current under recommended operating conditions (T_A ≤ 85°C, proper PCB thermal design). Its cycle-by-cycle overcurrent limit triggers at 2.5–4.7 A depending on inductor DCR and layout, but sustained operation above 2 A requires careful thermal management using the exposed thermal pad and adequate copper area.

Does the TPS54227DRCT support prebiased soft-start, and how does it function?

Yes, the TPS54227DRCT supports prebiased soft-start. When the output voltage is already present at startup, the device avoids sinking current by gradually increasing low-side FET conduction time cycle-by-cycle until reaching normal duty-cycle operation - preventing output voltage collapse and ensuring monotonic ramp-up without external circuitry.

What is the purpose of the VREG5 pin on the TPS54227DRCT, and what load can it drive?

The VREG5 pin on the TPS54227DRCT provides a regulated 5.5-V ±0.3-V output used internally for gate drive and logic circuits. It can supply up to 60 mA and must be decoupled with a 1-μF ceramic capacitor to GND; it is disabled when EN is low, contributing to sub-10-μA shutdown current.

Can the TPS54227DRCT operate with only ceramic output capacitors, and why?

Yes, the TPS54227DRCT is specifically designed to operate with ceramic output capacitors (22–68 µF typical). Its D-CAP2™ control architecture injects an internal ripple signal to maintain loop stability without relying on ESR-induced voltage ripple - eliminating the need for tantalum or aluminum electrolytic capacitors and reducing size, cost, and aging concerns.

What thermal metrics apply to the TPS54227DRCT in its VSON-10 package?

The TPS54227DRCT in the VSON-10 (DRC) package has R_θJA = 43.9°C/W (junction-to-ambient, JEDEC standard), R_θJB = 18.9°C/W (junction-to-board), and R_θJC(bot) = 5.3°C/W (junction-to-case bottom). Effective thermal performance requires soldering the exposed thermal pad to a minimum 100-mm² PCB copper area with ≥4 thermal vias to inner ground planes.