Texas Instruments TPS54353PWPR

Overview

TPS54353PWPR from Texas Instruments is a synchronous buck PWM converter with integrated 100 mΩ high-side MOSFET and external low-side MOSFET gate driver, delivering up to 3-A continuous output current at 1.5 V fixed output voltage. It operates from 4.5 V to 20 V input, supports 250 kHz or 500 kHz fixed switching frequency, and features internal slow-start, power-good indication, and 180° out-of-phase synchronization capability for multi-rail point-of-load systems in FPGAs and DSPs.

For engineers reviewing the TPS54353PWPR datasheet, TPS54353PWPR pinout, TPS54353PWPR application, or TPS54353PWPR equivalent, key selection considerations include its 1.5 V fixed output, 16-pin TSSOP PowerPAD package with thermal pad, UVLO adjustability via external resistor divider, and compatibility with external Schottky diode or N-channel MOSFET for low-side conduction.

Technical Context

The TPS54353PWPR implements feed-forward modulator control with 8 V/V gain, adaptive dead-time logic to prevent shoot-through, and a bidirectional SYNC pin configurable as input (for external clock synchronization) or output (180° out-of-phase PH signal). Its error amplifier delivers 1.5 mA drive capability, 60 dB open-loop gain, and 2 MHz unity-gain bandwidth for fast transient response.

Internal compensation eliminates need for external Type II/III networks; undervoltage lockout thresholds are factory-set at 4.49 V start / 3.69 V stop (adjustable via UVLO pin), and thermal shutdown activates at 165°C with 7°C hysteresis. The device uses a 0.891 V internal reference trimmed during production for ±1% output accuracy over load and temperature.

Key Specifications

Pinout & Package

TPS54353PWPR is housed in a thermally enhanced 16-pin HTSSOP (PWP) PowerPAD™ package with exposed thermal pad soldered to PCB ground plane for optimal heat dissipation. Package dimensions: 5.0 mm × 6.4 mm × 1.2 mm (height), 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54353PWPR, TPS54353PWP offers identical functionality in non-reel packaging for flexibility in low-volume use, while TPS54360BQPWPRQ1 trades fixed 1.5 V simplicity for automotive qualification and extended input range - neither is pin-compatible nor functionally interchangeable without schematic changes.

Availability

TPS54353PWPR is available at Aetrix Electronics and suitable for FPGA power delivery, DSP point-of-load regulation, LCD panel logic supplies, and industrial sensor hub designs requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for TPS54353PWPR 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-efficiency DC/DC conversion.

The TPS5435x family was designed specifically for cost-sensitive, space-constrained point-of-load applications in computing, consumer, and industrial systems requiring fixed-output, thermally robust synchronous buck regulation.

FAQ

What is the output voltage tolerance of the TPS54353PWPR over temperature and load?

The TPS54353PWPR delivers 1.5 V output with ±1.5% tolerance at 25°C and 100 mA–3 A load, tightening to ±2% across –40°C to +125°C junction temperature and full input voltage range (4.5 V–20 V). This specification is guaranteed by production testing using the internal 0.891 V trimmed reference and feed-forward modulation that maintains regulation accuracy independent of input variation.

Can the TPS54353PWPR operate without an external low-side MOSFET?

Yes, the TPS54353PWPR can operate with only an external Schottky diode connected from PH to PGND - the integrated pulldown MOSFET supports light-load CCM operation. However, for full 3-A continuous output with highest efficiency, an external N-channel MOSFET driven by the LSG pin is recommended. The device automatically adapts dead-time control whether diode or MOSFET is used.

How does the SYNC pin function in TPS54353PWPR when RT is left floating?

When the RT pin is floating, the TPS54353PWPR operates at 500 kHz and configures SYNC as an output - generating a falling-edge signal that is 180° out-of-phase with the rising edge of the PH pin. This allows direct interleaving with a second TPS5435x device without external clock sources, reducing input ripple and enabling shared bulk capacitance in multi-rail systems.

What thermal performance can be expected from the TPS54353PWPR in a standard 2-layer PCB layout?

In a standard 2-layer PCB with 2 oz. copper, 3″×3″ board, and PowerPAD soldered to internal/external ground planes with thermal vias, the TPS54353PWPR achieves 42.1°C/W junction-to-ambient thermal impedance. At 3 A output and 12 V input, this yields ~45°C junction rise above ambient - well within the 125°C max operating limit, even at 70°C ambient temperature.

Is the TPS54353PWPR compatible with ceramic output capacitors only, or can electrolytic types be used?

The TPS54353PWPR is optimized for low-ESR ceramic output capacitors (e.g., 22–47 µF X5R/X7R), which ensure stable loop response and minimal output ripple. While aluminum polymer or tantalum capacitors may be used for bulk storage, their higher ESR degrades transient response and risks instability. TI's SWIFT Designer tool validates ceramic-only designs for this device.