Texas Instruments TPS54233DR

Overview

TPS54233 from Texas Instruments is a 28 V, 2 A non-synchronous buck DC/DC converter with integrated 80 mΩ high-side MOSFET, fixed 300 kHz switching frequency, Eco-mode™ for light-load efficiency, and adjustable output down to 0.8 V. It delivers stable 3.3 V at 2 A in consumer power supplies such as LCD displays and set-top boxes.

For engineers reviewing the TPS54233 datasheet, TPS54233 pinout, TPS54233 application, or TPS54233 equivalent, key selection criteria include input voltage range (3.5–28 V), shutdown current (1 μA), UVLO programmability, overvoltage transient protection, and SOIC-8 thermal performance.

Technical Context

The TPS54233 uses constant-frequency peak current mode control with internal slope compensation, enabling stable operation with ceramic output capacitors and simplified loop compensation. Its Eco-mode™ activates below 100 mA peak inductor current, reducing switching activity to maintain >85% efficiency at light loads.

It implements cycle-by-cycle current limiting, frequency foldback during overcurrent (down to 37.5 kHz), overvoltage transient protection (clamping at 109% × V_REF), and thermal shutdown at 165°C. The error amplifier features 92 μA/V transconductance, 800 V/V DC gain, and 2.7 MHz unity-gain bandwidth for robust regulation.

Key Specifications

Pinout & Package

TPS54233 is housed in an 8-pin SOIC package (4.90 mm × 3.90 mm) optimized for thermal dissipation, with exposed pad not present (standard SOIC-D). Pin functions are validated per TI SLUS859C Rev C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54231 and TPS54232, the TPS54233 offers superior light-load efficiency via Eco-mode™ and lower conduction loss with its 80 mΩ MOSFET, making it optimal for 300 kHz industrial and consumer power supplies where thermal and standby performance are prioritized.

Availability

TPS54233 is available at Aetrix Electronics and suitable for consumer electronics, industrial distributed power systems, and automotive infotainment requiring stable component supply across multi-year production cycles.

Supply support for TPS54233 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 DC/DC conversion and power system design.

The TPS54233 belongs to TI's SWIFT™ family of integrated buck regulators, engineered for cost-sensitive, thermally constrained applications demanding high efficiency, small solution size, and robust protection features.

FAQ

What is the minimum input voltage required for TPS54233 to operate?

The TPS54233 requires a minimum input voltage of 3.5 V to initiate and sustain normal switching operation. Below this threshold, the internal undervoltage lockout disables the high-side MOSFET. This specification is verified across –40°C to 150°C junction temperature and applies to all TPS54233 units regardless of output configuration. The TPS54233 will not regulate or deliver output current if VIN remains below 3.5 V.

Does TPS54233 support adjustable output voltage, and what is the lowest achievable value?

Yes, the TPS54233 supports fully adjustable output voltage using an external resistor divider on the VSENSE pin. The internal voltage reference is 0.8 V ±2%, enabling output voltages as low as 0.8 V. For example, a 3.3 V output is achieved with R5 = 10.2 kΩ and R6 = 3.24 kΩ. All TPS54233 units maintain this capability across temperature and load conditions per SLUS859C Rev C specifications.

How does Eco-mode™ function in TPS54233, and at what load does it activate?

Eco-mode™ in the TPS54233 is an automatic pulse-skipping feature that activates when peak inductor current falls below 100 mA (typical). During Eco-mode™, the COMP pin voltage is clamped at 0.5 V, halting high-side switching to reduce switching losses. The TPS54233 exits Eco-mode™ when load demand raises peak current above this threshold. This behavior is intrinsic to every TPS54233 unit and is confirmed in Section 8.4.1 of the official datasheet.

What protection features are built into the TPS54233?

The TPS54233 integrates cycle-by-cycle current limiting, frequency foldback (down to 37.5 kHz), overvoltage transient protection (clamping at 109% × V_REF), thermal shutdown at 165°C, and input UVLO. These protections operate independently and concurrently - for instance, OVTP triggers even during thermal shutdown. All features are implemented in silicon and apply uniformly across the TPS54233 production lot per TI's characterization data.

Can the TPS54233 be used with ceramic output capacitors, and what compensation is required?

Yes, the TPS54233 is explicitly designed for use with ceramic output capacitors, enabled by its current-mode control with internal slope compensation. Compensation is implemented via an RC network between COMP and GND - typically a series RC (e.g., 2.7 kΩ + 1 nF) for Type II response. TI provides recommended values in Table 1 of SLUS859C, and WEBENCH® software validates stability for each design. No external ramp generator is needed.