Texas Instruments TPS548B22RVFT

Overview

TPS548B22 from Texas Instruments is a 25-A synchronous step-down DC/DC converter with integrated 4.1-mΩ high-side and 1.9-mΩ low-side MOSFETs, D-CAP3™ adaptive on-time control, full differential remote sensing, and 0.6–5.5-V programmable output voltage. It operates from 1.5–18-V PVIN and 4.5–22-V VDD inputs, delivering high efficiency and fast transient response for FPGA, SoC, and ASIC core rails.

For engineers reviewing the TPS548B22 datasheet, TPS548B22 pinout, TPS548B22 application, or TPS548B22 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and protection behavior, and real-world application constraints - all derived from TI's production-grade SLUSCE4A datasheet (Rev. A, July 2017).

Technical Context

The TPS548B22 implements D-CAP3™ control with adaptive on-time architecture, enabling stable operation with all-ceramic output capacitors without external compensation. Its differential remote sense amplifier (RSP/RSN) supports ±0.5% reference accuracy over –40°C to +125°C junction temperature, with unity-gain bandwidth of 5–7 MHz and ±4.7 V/µs slew rate.

Switching frequency is selectable via FSEL resistor network at four fixed points: 425 kHz, 650 kHz, 875 kHz, or 1.05 MHz. Overcurrent protection uses temperature-compensated R_DS(on) sensing with programmable positive/negative valley limits (e.g., ±25 A at R_LIM = 51.1 kΩ), and fault responses include hiccup-mode OVP/UVP and non-latched OTP at 155–165°C.

Key Specifications

Pinout & Package

TPS548B22 is housed in a 7 mm × 5 mm, 40-pin LQFN-CLIP (RVFT) package with an exposed thermal pad on the bottom. The package integrates power and signal pins across four sides, with dedicated high-current PVIN, SW, and PGND banks, plus precision analog inputs (RSP/RSN/VOSNS) and configuration pins (FSEL/VSEL/MODE).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS548B22, TPS546B24A trades differential sensing and wider VOUT range for simpler control and lower BOM count, while MP2964GQKT adds digital control at the expense of analog accuracy, thermal performance, and pin-level protection granularity - making TPS548B22 optimal for high-reliability, high-accuracy analog point-of-load designs.

Availability

TPS548B22 is available at Aetrix Electronics and suitable for enterprise storage, 5G infrastructure, and industrial automation applications requiring stable component supply, long-term lifecycle support, and RoHS-exempt packaging compliance.

Supply support for TPS548B22 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 TPS548B22 belongs to TI's SWIFT™ family of high-current synchronous buck converters, engineered specifically for demanding point-of-load applications in servers, networking gear, and AI hardware where thermal density, accuracy, and transient response are critical.

FAQ

What is the maximum supported output voltage for TPS548B22?

The TPS548B22 supports an output voltage range of 0.6 V to 5.5 V. This is achieved either through the VSEL pin (0.6–1.2 V in 50-mV steps) or external resistor divider feedback (up to 5.5 V). The device's internal reference is 0.9 V with ±0.5% tolerance over –40°C to +125°C, ensuring tight regulation across its full output range. Operation beyond 5.5 V is not supported and may damage the IC.

Does TPS548B22 require external compensation components?

No, the TPS548B22 does not require external compensation components. Its D-CAP3™ control architecture uses emulated current information and adaptive on-time modulation to maintain stability with all-ceramic output capacitors - including small MLCCs - eliminating the need for traditional Type-II or Type-III compensation networks. This reduces BOM count, simplifies layout, and improves reliability in space-constrained designs.

How is overcurrent protection configured on TPS548B22?

Overcurrent protection on the TPS548B22 is configured via the ILIM pin, which accepts a resistor to ground to set the positive and negative valley current limit. For example, a 51.1-kΩ resistor sets ±25 A with ±15% tolerance. The protection uses temperature-compensated R_DS(on) sensing (1200 ppm/°C slope) and operates in cycle-by-cycle mode, latching off the high-side FET and activating the low-side FET upon violation. Response time is under 1 µs for OVP events.

Can TPS548B22 operate with PVIN and VDD supplied from the same source?

Yes, the TPS548B22 can operate with PVIN and VDD supplied from the same source, provided the shared rail meets both specifications: 1.5–18 V for PVIN and 4.5–22 V for VDD. The EN_UVLO pin allows precise programming of the combined UVLO threshold (e.g., 1.6 V typical) using an external resistor divider, ensuring controlled startup sequencing. However, separate VDD bias is recommended for improved noise immunity and robustness during PVIN transients.

What thermal performance can be expected from TPS548B22 in a typical 4-layer PCB layout?

In a standard 4-layer PCB with 2 oz copper, 1-in² thermal pad exposure, and 100 LFM airflow, the TPS548B22 achieves ≤65°C junction rise at 25 A (VIN=12 V, VOUT=1 V), per TI's SLUUBI9 EVM validation. Its R_θJB of 3.6°C/W and exposed thermal pad enable efficient heat transfer to the board. Without forced airflow, natural convection sustains 20 A at 60°C ambient - verified in Figure 9–12 of the SLUSCE4A datasheet.