Texas Instruments TPS54233D

Overview

TPS54233 from Texas Instruments is a 28 V input, 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 - used in 5 V/12 V/24 V distributed power systems and LCD display power rails.

For engineers reviewing the TPS54233 datasheet, TPS54233 pinout, TPS54233 application, or TPS54233 equivalent, key selection considerations include its 3.5–28 V input range, 1 μA shutdown current, programmable UVLO, overvoltage transient protection, and SOIC-8 thermal performance optimized for industrial and consumer power supplies.

Technical Context

The TPS54233 implements constant-frequency peak current mode control with internal slope compensation, enabling stable operation with ceramic output capacitors and simplified loop compensation. Its error amplifier features 92 μA/V transconductance and 800 V/V DC gain, with COMP pin serving as both error amplifier output and PWM comparator input.

It integrates boot recharge diode functionality and monitors BOOT-PH voltage (threshold ~2.1 V) to prevent high-side MOSFET misfiring. During overload, it employs frequency foldback (down to 37.5 kHz) and cycle-by-cycle current limiting, while thermal shutdown activates at 165°C with automatic recovery.

Key Specifications

Pinout & Package

TPS54233 is housed in an internally thermally enhanced SOIC-8 (D package), 4.90 mm × 3.90 mm body size, with exposed pad not present - optimized for PCB copper pour heat spreading without PowerPAD™.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54231 and TPS54331, the TPS54233 uniquely balances light-load efficiency (via Eco-mode™), thermal robustness in standard SOIC-8, and cost-effective integration - making it optimal for mid-power consumer and industrial POL applications where 2 A and 300 kHz are sufficient.

Availability

TPS54233 is available at Aetrix Electronics and suitable for consumer LCD displays, industrial 24V distributed power systems, and automotive infotainment subsystems requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

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 high-reliability power conversion solutions.

The TPS54233 belongs to TI's SWIFT™ family of integrated DC/DC converters - designed specifically for cost-sensitive, medium-current industrial and consumer applications demanding simplicity, thermal resilience, and light-load efficiency without external MOSFETs.

FAQ

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

TPS54233 requires a minimum input voltage of 3.5 V to maintain regulation and avoid undervoltage lockout. Below this threshold, the device disables switching and enters shutdown mode. The internal UVLO threshold is fixed at 3.5 V (rising/falling), but can be adjusted upward using external resistors on the EN pin to implement hysteresis for cleaner power sequencing.

Does the 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 connected to the VSENSE pin. The lowest achievable output is set by the internal 0.8 V reference voltage - meaning outputs down to 0.8 V are directly supported. For example, a 3.3 V output is achieved with R5 = 10.2 kΩ and R6 = 3.24 kΩ, as confirmed in the TPS54233 typical application schematic.

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

Eco-mode™ in the TPS54233 improves light-load efficiency by automatically skipping switching pulses when peak inductor current falls below approximately 100 mA. During Eco-mode™, the COMP pin is clamped at 0.5 V, halting high-side MOSFET switching until load demand increases. This enables efficiencies above 85% at 10–50 mA loads - critical for standby power in consumer electronics.

What protection features are built into the TPS54233?

The TPS54233 integrates multiple protection features: cycle-by-cycle current limiting, frequency foldback during overload (reducing switching frequency down to 37.5 kHz), overvoltage transient protection (clamping at 109% of VREF), thermal shutdown at 165°C, and input UVLO. These work together to safeguard both the IC and downstream circuitry during faults such as short circuits, overtemperature, or input transients.

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. Its current-mode architecture with internal slope compensation simplifies loop stability - requiring only a type-II or type-III compensation network connected between COMP and GND. TI provides recommended RC values in the datasheet (e.g., C7 = 220 pF, C6 = 220 pF, R3 = 30.9 kΩ for 3.3 V/2 A design) and supports full design validation via WEBENCH® software.