Texas Instruments TPS54310PWPRG4

Overview

TPS54310PWPRG4 from Texas Instruments is a synchronous-buck PWM DC/DC converter with integrated 60-mΩ high- and low-side MOSFETs, delivering up to 3 A continuous output current. It operates from 3-V to 6-V input, regulates down to 0.9 V with ±1% reference accuracy (0.891 V), and supports adjustable switching frequency from 280 kHz to 700 kHz. It is used in point-of-load regulation for FPGAs and microprocessors requiring fast transient response and tight voltage tolerance.

For engineers reviewing the TPS54310PWPRG4 datasheet, TPS54310PWPRG4 pinout, TPS54310PWPRG4 application, or TPS54310PWPRG4 equivalent, key selection criteria include its HTSSOP-20 PowerPAD™ package thermal performance (R_θJA = 26°C/W), externally compensated control loop for design flexibility, power-good open-drain output for supply sequencing, and integrated undervoltage lockout (UVLO) with 2.95-V start threshold.

Technical Context

The TPS54310PWPRG4 implements a voltage-mode synchronous buck architecture with a high-performance error amplifier (90–110 dB open-loop gain, 3–5 MHz unity-gain bandwidth) and externally adjustable compensation. Its PWM control logic incorporates adaptive dead-time management, 100-ns leading-edge blanking for current limit detection, and cycle-by-cycle overcurrent protection triggered at 4–7.5 A depending on input voltage.

It features dual-function pins: SS/ENA enables device operation and sets slow-start time (internally 3.35 ms, extendable with external capacitor), while SYNC selects fixed 350/550 kHz operation or enables external synchronization (330–700 kHz). The VBIAS regulator supplies internal circuitry at 2.7–2.9 V and supports external bypassing with 0.1–1.0 µF ceramic capacitors.

Key Specifications

Pinout & Package

TPS54310PWPRG4 is housed in a thermally enhanced 20-pin HTSSOP (PWP) PowerPAD™ package measuring 6.40 mm × 6.30 mm, with exposed thermal pad soldered to AGND plane for optimal heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54310PWPRG4, TPS54312PWPR offers identical thermal and electrical performance but lacks output adjustability, while TPS54302DDCR trades current capability, thermal robustness, and system-level features (PWRGD, PowerPAD™) for miniaturization and higher-frequency operation.

Availability

TPS54310PWPRG4 is available at Aetrix Electronics and suitable for point-of-load FPGA supplies, industrial DSP power management, optical transceiver biasing, and notebook I/O rail applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for TPS54310PWPRG4 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.

The TPS543xx family was designed specifically for high-density, low-voltage point-of-load applications in computing, communications, and industrial systems-emphasizing integration, thermal performance, and ease of use through features like PowerPAD™ packaging and flexible frequency control.

FAQ

What is the recommended input capacitor configuration for TPS54310PWPRG4?

TPS54310PWPRG4 requires high-quality, low-ESR ceramic capacitors (1–10 µF total) placed close to VIN pins 14–16 and connected directly to PGND pins 11–13. Use X7R or X5R dielectrics; split capacitance across multiple 0805 or 1206 devices to minimize ESL. The datasheet specifies a minimum 1-µF value per VIN pin, with bulk capacitance added externally if needed for hold-up time.

Does TPS54310PWPRG4 support forced continuous conduction mode (FCCM)?

No, TPS54310PWPRG4 operates exclusively in continuous conduction mode (CCM) across its full load range. It does not include a mode-select pin or internal circuitry to force discontinuous conduction mode (DCM) or pulse-frequency modulation (PFM). Its control architecture maintains complementary high- and low-side switching regardless of output current level.

How is the TPS54310PWPRG4 power-good (PWRGD) signal used in supply sequencing?

The TPS54310PWPRG4 PWRGD pin is an open-drain output that goes high only when VSENSE ≥ 90% of the 0.891-V reference, SS/ENA is enabled, VIN exceeds UVLO, and thermal shutdown is inactive. It is commonly pulled up to a downstream rail (e.g., 3.3 V) and used to enable subsequent regulators or assert processor RESET_N, ensuring safe power-up order in multi-rail systems.

Can TPS54310PWPRG4 be synchronized to an external clock, and what are the constraints?

Yes, TPS54310PWPRG4 supports external synchronization via the SYNC pin over 330–700 kHz. To synchronize, drive SYNC with a clean square wave and connect an RT resistor to AGND sized for 80% of the target sync frequency (e.g., 560 kHz sync → RT for 448 kHz). The SYNC signal must meet logic thresholds (low ≤0.8 V, high ≥2.5 V) and have <50-ns rise/fall times to avoid metastability.

What is the maximum allowable output voltage ripple for stable operation of TPS54310PWPRG4?

TPS54310PWPRG4 does not specify a maximum output ripple limit for stability, as loop stability depends on external compensation and LC filter design-not ripple amplitude. However, typical designs maintain <20 mV_pp ripple at 3 A using standard 2.2–4.7 µH inductors and 22–47 µF output capacitance. Excessive ripple may indicate inadequate output capacitance or poor layout, risking PWRGD false triggering or transient undershoot.