Texas Instruments TPS54531DDAR

Overview

TPS54531DDAR from Texas Instruments is a 28-V, 5-A non-synchronous buck converter with integrated 80-mΩ high-side MOSFET, fixed 570-kHz switching frequency, adjustable output down to 0.8 V, and pulse-skipping Eco-mode for light-load efficiency-used in 5-V/12-V/24-V distributed power systems and industrial audio supplies.

For engineers reviewing the TPS54531DDAR datasheet, TPS54531DDAR pinout, TPS54531DDAR application, or TPS54531DDAR equivalent, key selection criteria include input voltage range (3.5–28 V), shutdown current (1 μA), Eco-mode activation threshold (160 mA), thermal shutdown (165°C), and SO PowerPAD™ package thermal resistance (R_θJA = 55°C/W).

Technical Context

The TPS54531DDAR implements constant-frequency peak-current mode control with internal slope compensation, enabling stable operation with ceramic output capacitors and simplified external compensation. Its transconductance error amplifier (92 μA/V) and programmable UVLO (via EN pin resistors) support flexible system-level power sequencing and transient robustness.

It integrates boot recharge diode functionality and monitors BOOT-PH voltage (UVLO at ~2.1 V) to ensure reliable high-side gate drive. During overcurrent, it applies frequency foldback-scaling switching frequency from 570 kHz down to 71 kHz-as VSENSE drops below 0.6 V, limiting inductor current runaway without external circuitry.

Key Specifications

Pinout & Package

TPS54531DDAR uses an 8-pin SOIC package with exposed PowerPAD™ (DDA), measuring 4.9 mm × 6 mm, optimized for low R_θJA (55°C/W) via direct thermal path to PCB copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54531DDAR, TPS54332DDA trades 1.5-A current headroom for higher switching frequency and identical footprint, while TPS54531PWP offers superior thermal handling in a non-pin-compatible package-making TPS54531DDAR optimal for cost-sensitive, space-constrained 5-A applications where ambient temperature stays below 85°C.

Availability

TPS54531DDAR is available at Aetrix Electronics and suitable for industrial audio power supplies, set-top box DC-DC conversion, and 24-V distributed power systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TPS54531DDAR 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-reliability power conversion ICs.

The TPS54531 belongs to TI's SWIFT™ synchronous and non-synchronous buck converter family, engineered for high-efficiency, thermally robust DC-DC conversion in industrial, automotive, and consumer power systems.

FAQ

What is the minimum input voltage required for TPS54531DDAR to operate?

The TPS54531DDAR requires a minimum input voltage of 3.5 V for normal operation, as defined by its internal undervoltage lockout (UVLO) threshold. Below this, the device ceases switching-even if the EN pin is asserted-ensuring reliable startup only when sufficient input energy is present. The UVLO has built-in hysteresis, and external resistor networks on the EN pin can further customize start/stop thresholds for system-level brown-out resilience.

Does TPS54531DDAR support adjustable output voltage, and how is it configured?

Yes, TPS54531DDAR supports adjustable output voltage down to 0.8 V using an external resistor divider connected to the VSENSE pin. The output voltage is calculated as V_OUT = 0.8 V × (1 + R₅/R₆), where R₅ connects from VOUT to VSENSE and R₆ from VSENSE to GND. A typical design uses R₅ = 10.2 kΩ and R₆ = 1.96 kΩ to achieve 5 V. The 0.8-V reference has ±2% initial accuracy and ≤±3.5% variation over temperature.

How does Eco-mode function in TPS54531DDAR, and what is its impact on efficiency?

TPS54531DDAR enters Eco-mode automatically when peak inductor current falls below 160 mA (typical), skipping switching cycles to reduce switching losses. This maintains >85% efficiency at light loads (e.g., 10–100 mA), significantly outperforming forced-PWM operation. During Eco-mode, the COMP pin is clamped at ~0.5 V, disabling the high-side MOSFET until load increases. It exits Eco-mode seamlessly when inductor current rises above the threshold-no external control needed.

What thermal protection mechanisms does TPS54531DDAR include?

TPS54531DDAR incorporates thermal shutdown that triggers at 165°C junction temperature, halting switching until the die cools below the threshold. It also features frequency foldback-reducing switching frequency from 570 kHz to as low as 71 kHz during overcurrent-to limit power dissipation and prevent thermal runaway. Combined with the SO PowerPAD™ package (R_θJA = 55°C/W), these mechanisms ensure safe operation under sustained overload or poor heatsinking conditions.

Can TPS54531DDAR be used with ceramic output capacitors, and what compensation considerations apply?

Yes, TPS54531DDAR is fully compatible with ceramic output capacitors due to its current-mode control with internal slope compensation. However, ceramic capacitance derating must be accounted for-actual capacitance drops significantly at rated voltage-so stability analysis should use effective capacitance values. Compensation components (resistor + capacitor) connect between COMP and GND; TI recommends starting with Type II compensation and verifying phase margin ≥45° across line/load/temperature variations using the device's 92-μA/V transconductance error amplifier.