Texas Instruments TPS54232D

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™ pulse-skipping 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 input voltage range (3.5–28 V), shutdown current (1 μA), Eco-Mode activation threshold (100 mA), thermal shutdown (165°C), and SOIC-8 package compatibility with ceramic output capacitors.

Technical Context

The TPS54232 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 2.7-MHz unity-gain bandwidth, referenced to a ±2% accurate 0.8-V bandgap.

Functional modes include Eco-Mode™ (activated below 100 mA peak inductor current), frequency foldback during overcurrent (down to 125 kHz), and overvoltage transient protection that disables the high-side MOSFET when VSENSE exceeds 109% of Vref. The BOOT-PH bootstrap circuit requires a 0.1-μF X7R/X5R capacitor and monitors gate drive voltage with 2.1-V UVLO.

Key Specifications

Pinout & Package

TPS54232 is housed in an 8-pin SOIC package (4.90 mm × 3.90 mm) with standard JEDEC MS-012AC footprint and exposed pad not present. Thermal resistance R_θJA is 116.3°C/W on 2-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54231, the TPS54232 offers superior light-load efficiency and tighter output regulation due to Eco-Mode and higher current limit; compared with TPS54332, it trades thermal capability for lower cost and standard SOIC compatibility-making it optimal for 2-A, space-constrained, battery-aware designs.

Availability

TPS54232 is available at Aetrix Electronics and suitable for consumer set-top boxes, industrial sensor nodes, and automotive car audio power supplies 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-efficiency DC-DC conversion and automotive-grade reliability.

The TPS54232 belongs to TI's SWIFT™ family of integrated FET buck converters, designed specifically for compact, high-efficiency point-of-load regulation in space- and power-constrained applications like portable electronics and distributed power systems.

FAQ

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

The TPS54232 requires a minimum input voltage of 3.5 V to operate normally, as specified in its recommended operating conditions. Below this threshold, the device may not initiate switching even if the EN pin is enabled. The internal undervoltage lockout (UVLO) rising threshold is guaranteed at 3.5 V, and operation at lower voltages is not characterized or supported. For applications with input rails near this limit-such as automotive cold-crank scenarios-the TPS54232 should be paired with upstream supervision or selected only where VIN remains ≥3.5 V during all operational states.

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 halting high-side MOSFET switching. This pulse-skipping behavior reduces switching losses and sustains >85% efficiency at light loads (e.g., 10 mA). Activation is load-dependent and influenced by output filter design; average load current at entry varies with inductance and output capacitance. Eco-Mode deactivates when peak current rises above 100 mA, restoring fixed-frequency PWM operation. No external enable is required-the feature is fully autonomous.

Can the TPS54232 be used with ceramic output capacitors, and what compensation considerations apply?

Yes, the TPS54232 is explicitly designed for use with ceramic output capacitors, enabled by its internal slope-compensated current-mode architecture. However, ceramic capacitance derating must be accounted for-actual capacitance can drop >50% at rated DC bias-so stability analysis must use the effective capacitance at operating voltage. Compensation components (resistor and capacitor) connect between COMP and GND; typical values are 2.7 kΩ and 1 nF for 2.5-V/2-A designs. TI's WEBENCH® tool generates validated component values, and the datasheet provides detailed design equations for manual calculation.

What is the purpose of the BOOT and PH pins, and what capacitor value is required between them?

The BOOT pin supplies gate drive voltage to the internal high-side MOSFET via a bootstrap circuit referenced to the PH (power switch) node. A 0.1-μF ceramic capacitor-X7R or X5R dielectric-is required between BOOT and PH to maintain sufficient gate voltage during high-duty-cycle operation. This capacitor is recharged each cycle through an integrated boot diode. If the BOOT-PH voltage drops below ~2.1 V, the high-side MOSFET is disabled to prevent shoot-through. Using a capacitor outside the recommended grade or value risks unstable gate drive, reduced efficiency, or failure to regulate at low output voltages.

Does the TPS54232 provide overvoltage protection, and how does it respond to output transients?

Yes, the TPS54232 includes dedicated overvoltage transient protection (OVTP) that monitors the VSENSE pin. When VSENSE exceeds 109% of the 0.8-V reference (i.e., 0.872 V), the high-side MOSFET is immediately disabled to clamp output voltage. Recovery occurs when VSENSE falls below 107% of Vref (0.856 V), restoring normal regulation. This circuit mitigates overshoot during rapid load removal (e.g., disconnecting a peripheral) or startup into a pre-biased output, protecting downstream 3.3-V or 5-V logic. OVTP operates independently of the error amplifier and functions even during Eco-Mode.