Texas Instruments TPS54325PWP

Overview

TPS54325PWP from Texas Instruments is a 4.5-V to 18-V input, 3-A synchronous step-down DC/DC converter with integrated high-side (120 mΩ) and low-side (70 mΩ) N-channel MOSFETs, D-CAP2™ adaptive on-time control, and 700-kHz switching frequency-designed for digital TV power supplies, Blu-ray players, and STB applications requiring fast transient response and ceramic output capacitors.

For engineers reviewing the TPS54325PWP datasheet, TPS54325PWP pinout, TPS54325PWP application, or TPS54325PWP equivalent, key selection considerations include its adjustable 0.76–5.5 V output, pre-biased soft start, power good output, cycle-by-cycle overcurrent protection, and HTSSOP-14 thermal-pad package for industrial temperature operation (–40°C to 85°C).

Technical Context

The TPS54325PWP implements D-CAP2™ mode control-a pseudo-fixed-frequency adaptive on-time architecture that eliminates external compensation while supporting ultra-low-ESR ceramic output capacitors. Its internal one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, enabling stable regulation across 4.5–18 V input and 0.76–5.5 V output ranges.

It integrates dual N-FETs with 120 mΩ high-side and 70 mΩ low-side R_DS(on), a 5.5-V VREG5 LDO, open-drain PG output with ±10% trip threshold, and comprehensive protection including non-latching OCP, UVLO (3.7 V), thermal shutdown (150°C), and output OVP/UVP with 5 µs / 250 µs delays.

Key Specifications

Pinout & Package

TPS54325PWP is housed in a thermally enhanced 14-pin HTSSOP (PWP) package (5.00 mm × 4.40 mm) with exposed PowerPAD™ for PCB-level heat dissipation. The package requires soldering the thermal pad to PGND for optimal thermal performance (R_θJA = 55.6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54325PWP, TPS54327PWP offers extended input range and EMI reduction but differs in soft-start timing and UVLO thresholds, while MP2332HG-P trades integrated features (VREG5, pre-bias start) for wider VIN and lower I_Q, requiring additional support components.

Availability

TPS54325PWP is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray disc players, and networking home terminals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS54325PWP 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 DC/DC conversion solutions.

The TPS543xx family-including TPS54325PWP-is designed specifically for space-constrained, high-efficiency point-of-load applications in consumer electronics, delivering integrated FETs, adaptive control, and robust protection in thermally optimized packages.

FAQ

What is the recommended input voltage range for reliable operation of the TPS54325PWP?

The TPS54325PWP is specified for reliable operation with VCC input between 4.5 V and 18 V, and VIN input between 2.0 V and 18 V. While it can function down to ~3.7 V (UVLO threshold), TI recommends maintaining VCC ≥ 4.5 V for full specification compliance, including guaranteed 3-A output current, thermal performance, and D-CAP2™ loop stability. Operation below 4.5 V may reduce efficiency and transient response margin.

Does the TPS54325PWP support pre-biased output startup, and how does it work?

Yes, the TPS54325PWP supports pre-biased soft start. When EN goes high and the output voltage exceeds the soft-start target, the controller initiates synchronous rectification with narrow low-side gate pulses, incrementally increasing on-time cycle-by-cycle until reaching normal duty-cycle operation. This prevents reverse current flow into the pre-charged output, avoiding voltage collapse and ensuring monotonic ramp-up-critical for systems with backup supplies or hot-plug scenarios.

What is the purpose of the VREG5 pin on the TPS54325PWP, and what load can it drive?

The VREG5 pin on the TPS54325PWP is a 5.5-V regulated output supplying internal circuitry and optionally external components. It delivers up to 70 mA (typical) with ±20 mV line/load regulation. A 1-µF ceramic capacitor to GND is mandatory for stability. It serves as the pull-up source for the PG pin and can power auxiliary logic, level shifters, or sensor bias-reducing need for external regulators in compact designs.

How does the TPS54325PWP implement overcurrent protection, and is it latching?

The TPS54325PWP uses cycle-by-cycle valley-current limiting based on low-side FET V_DS sensing, with temperature-compensated detection. When current exceeds ~3.5 A (min), the low-side FET remains on until sensed voltage falls below threshold, terminating the cycle. This protection is non-latching: after fault removal, the device automatically recovers and resumes regulation without requiring an EN toggle or power cycle-enabling robust operation under temporary overload conditions.

Can the TPS54325PWP operate with ceramic output capacitors only, and why is this significant?

Yes, the TPS54325PWP is explicitly designed for ceramic output capacitors, enabled by its D-CAP2™ control architecture and proprietary internal circuitry that adapts to ultra-low-ESR loads. This eliminates reliance on high-ESR electrolytics or POSCAPs, reducing solution size, improving reliability, lowering output ripple (<9 mVpp typical), and enabling faster transient response-key advantages for modern low-voltage, high-speed digital loads like SoCs and FPGAs.