Texas Instruments TPS54227DRCR

Overview

TPS54227DRCR 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 for fast transient response. It supports 4.5 V to 18 V input, delivers adjustable 0.76 V to 7 V output, features 700-kHz switching frequency, <10 µA shutdown current, and is optimized for ceramic output capacitors in space-constrained power rails for digital TV and STB applications.

For engineers reviewing the TPS54227DRCR datasheet, TPS54227DRCR pinout, TPS54227DRCR application, or TPS54227DRCR equivalent, key selection considerations include its VSON-10 package thermal performance (R_θJB = 18.9 °C/W), cycle-by-cycle overcurrent protection, prebiased soft-start capability, and compatibility with low-ESR ceramic output capacitors without external compensation.

Technical Context

The TPS54227DRCR implements D-CAP2™ control architecture-combining adaptive on-time PWM with internal ripple injection-to achieve stable regulation with zero external compensation components. Its control loop directly senses output voltage via the VFB pin and dynamically adjusts on-time based on VIN and VO to maintain ~700 kHz pseudo-fixed frequency across input and load variations.

It integrates two optimized MOSFETs (165 mΩ high-side, 108 mΩ low-side), a 5.5-V LDO (VREG5) for gate drive and bias, and proprietary circuitry enabling seamless startup into prebiased outputs. Protection includes non-latching thermal shutdown (165°C), UVLO on VREG5, and valley-current–based cycle-by-cycle overcurrent limiting.

Key Specifications

Pinout & Package

TPS54227DRCR uses a 10-pin VSON package (3.00 mm × 3.00 mm, 0.5-mm pitch) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (R_θJB = 18.9 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54227DRCR, TPS54229DDAR adds system-level monitoring capability at minimal footprint cost, while MP2307DN-LF-Z sacrifices adaptive control and ultra-low IQ for broader input range and lower unit price-making TPS54227DRCR optimal for compact, high-transient-performance consumer power rails.

Availability

TPS54227DRCR is available at Aetrix Electronics and suitable for digital TV power supply, HD Blu-ray player, networking home terminal, and digital set top box (STB) applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for TPS54227DRCR 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 technologies, with decades of expertise in high-efficiency DC/DC conversion.

The TPS54227DRCR belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for space-constrained, high-transient consumer and industrial applications where minimal external components and ceramic-capacitor compatibility are critical.

FAQ

What is the maximum recommended output current for TPS54227DRCR under continuous operation?

The TPS54227DRCR is rated for 2 A continuous output current across the full operating temperature range (–40°C to 85°C). This rating assumes proper PCB layout with the exposed thermal pad soldered to a minimum 200 mm² copper area connected to GND, ambient temperature ≤55°C, and input voltage ≤15 V. At 12 V_IN/1.05 V_OUT, typical efficiency exceeds 92%, keeping junction temperature within safe limits.

Does TPS54227DRCR support startup into a prebiased output voltage?

Yes, the TPS54227DRCR includes dedicated prebiased soft-start functionality. When the output is already charged above the target regulation voltage at startup, the controller delays activation of the low-side FET and incrementally increases its on-time cycle-by-cycle-preventing reverse current flow and ensuring monotonic voltage ramp-up. This behavior is inherent to the device and requires no external circuitry or configuration.

What capacitor values are required on the VBST and VREG5 pins for stable operation of TPS54227DRCR?

The TPS54227DRCR requires a 0.1-µF X7R ceramic capacitor placed directly between the VBST and SW pins for reliable high-side gate drive. A 1-µF X7R ceramic capacitor must be connected from VREG5 to GND to stabilize the internal LDO output. Both capacitors must be placed within 2 mm of their respective pins with short, low-inductance traces to prevent gate drive instability or VREG5 oscillation.

Can TPS54227DRCR operate with only ceramic output capacitors, and what is the minimum recommended value?

Yes, the TPS54227DRCR is explicitly designed for ceramic output capacitors and does not require added ESR for stability. The minimum recommended total output capacitance is 22 µF (e.g., two parallel 10-µF + 12-µF X5R/X7R devices), with typical designs using 22–68 µF. Lower values may compromise transient response and output voltage ripple, especially at 2-A load steps.

What is the function of the SS pin on TPS54227DRCR, and how is soft-start time calculated?

The SS pin on TPS54227DRCR controls soft-start duration via an external capacitor to GND. A 2-µA internal current source charges this capacitor; soft-start time (t_SS) is calculated as t_SS = (C_SS × 0.765 V) / 2 µA. For example, a 100-nF capacitor yields ~38.3 ms ramp time. The SS pin also enables prebiased startup and can be used to sequence multiple converters via external voltage control.