Texas Instruments TPS54232DR

Overview

TPS54232 from Texas Instruments is a 28-V, 2-A nonsynchronous step-down DC-DC converter with integrated 80-mΩ high-side MOSFET, fixed 1-MHz switching frequency, Eco-Mode™ for light-load efficiency, and adjustable output down to 0.8 V. It delivers stable 3.3-V/2-A power in consumer set-top boxes and industrial 24-V distributed supplies.

For engineers reviewing the TPS54232 datasheet, TPS54232 pinout, TPS54232 application, or TPS54232 equivalent, key selection criteria include its 3.5–28-V input range, 1-μA shutdown current, programmable UVLO threshold, overvoltage transient protection, and SOIC-8 thermal performance (R_θJA = 116.3°C/W).

Technical Context

The TPS54232 employs 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, 800 V/V DC gain, and 2.7-MHz unity-gain bandwidth.

Eco-Mode™ activates automatically when peak inductor current falls below 100 mA, clamping COMP at 0.5 V to skip pulses and reduce switching losses. During overcurrent or startup, frequency foldback lowers switching frequency to 125 kHz (1 MHz/8) as VSENSE drops below 0.2 V, limiting inductor current rise.

Key Specifications

Pinout & Package

TPS54232 is housed in an 8-pin SOIC package (4.90 mm × 3.90 mm), optimized for thermal dissipation (R_θJA = 116.3°C/W) and compatibility with standard PCB assembly processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with TPS54231 and TPS54233, the TPS54232 uniquely balances 1-MHz operation, SOIC-8 thermal performance, and Eco-Mode™ efficiency across 3.5–28-V inputs-making it optimal for space-constrained, wide-input consumer and industrial buck applications requiring fast transient response.

Availability

TPS54232 is available at Aetrix Electronics and suitable for consumer set-top boxes, industrial IoT sensor hubs, car audio DSP supplies, and 24-V distributed power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54232 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 TPS54232 belongs to TI's SWIFT™ family of integrated DC-DC converters, engineered specifically for high-efficiency, low-component-count buck regulation in cost-sensitive, thermally constrained applications from consumer to industrial.

FAQ

What is the minimum input voltage required for TPS54232 to operate reliably?

The TPS54232 requires a minimum input voltage of 3.5 V to operate normally, as defined by its undervoltage lockout (UVLO) threshold. Below this level, the device ceases switching. The EN pin can be used to implement a custom UVLO with hysteresis, but the internal threshold remains fixed at 3.5 V rising/falling. Operation at VIN < 3.5 V is not guaranteed and may result in unstable regulation or no output.

How does Eco-Mode™ function in the TPS54232, and what triggers its activation?

Eco-Mode™ in the TPS54232 activates automatically when the peak inductor current falls below 100 mA (typical), causing the COMP pin voltage to drop to ~0.5 V and skip switching cycles. This reduces switching losses and maintains high efficiency at light loads (e.g., 10–50 mA). The mode deactivates when load increases and peak current exceeds 100 mA, restoring full 1-MHz PWM operation. No external enable signal is required.

Can the TPS54232 safely drive a 3.3-V/2-A load from a 24-V input, and what thermal considerations apply?

Yes, the TPS54232 supports 24-V input and delivers 3.3-V/2-A output continuously. At 24-V_IN/3.3-V_OUT, power dissipation is ~1.8 W. With its SOIC-8 package and R_θJA = 116.3°C/W, junction temperature rise is ~210°C above ambient-exceeding safe limits without PCB copper heatsinking. A 2-in² 2-oz copper pour reduces R_θJA to ~57°C/W, keeping T_J within 150°C at 25°C ambient. Thermal shutdown at 165°C provides fault protection.

What external components are mandatory for basic TPS54232 operation, and why?

Mandatory external components for the TPS54232 include: (1) a 0.1-μF X7R/X5R ceramic capacitor between BOOT and PH for high-side gate drive; (2) input bulk + ceramic capacitors (e.g., 10-μF + 1-μF) at VIN to suppress ripple; (3) output LC filter (inductor + 22-μF ceramic); (4) resistor divider (e.g., 100 kΩ/49.9 kΩ) from VOUT to VSENSE/GND to set output voltage; and (5) optional SS capacitor for controlled startup. Omitting the BOOT capacitor causes immediate failure; missing input/output caps cause instability or overvoltage.

Does the TPS54232 support output voltages below 0.8 V, and how is the feedback network configured?

No, the TPS54232 does not support output voltages below 0.8 V because its internal voltage reference is fixed at 0.8 V ±2%. The feedback network connects the output to VSENSE through a resistor divider such that V_SENSE = V_OUT × [R2 / (R1 + R2)] = 0.8 V. For example, to achieve 3.3 V, use R1 = 316 kΩ and R2 = 100 kΩ. Attempting sub-0.8-V outputs results in regulation failure, as the error amplifier cannot drive COMP sufficiently to reduce duty cycle further.