Texas Instruments TPS51317RGBT

Overview

TPS51317RGBT from Texas Instruments is a fully integrated synchronous step-down DC/DC converter with D-CAP+™ adaptive on-time control, integrated high-side and low-side FETs, 6-A output capability, 0.6–2.0-V adjustable output voltage, and selectable 800-kHz/1-MHz/1.2-MHz/1.5-MHz switching frequency. It serves as the main core voltage regulator in space-constrained 3.3-V or 5-V input systems such as CPU power delivery for embedded controllers and low-voltage SoC applications.

For engineers reviewing the TPS51317RGBT datasheet, TPS51317RGBT pinout, TPS51317RGBT application, or TPS51317RGBT equivalent, key selection considerations include its D-CAP+™ transient response performance, support for all-MLCC output capacitors, auto-skip and ripple reduction light-load modes, non-droop/droop configuration flexibility, and thermal shutdown at 145°C with 10°C hysteresis.

Technical Context

The TPS51317RGBT implements D-CAP+™ mode by sensing current feedback (VCS) - an amplified version of the PGND-to-SW voltage during low-side FET conduction - and comparing it to the error amplifier output (VCOMP), enabling fast load-transient response without external compensation in non-droop mode. Its adaptive on-time generator adjusts pulse width based on VIN, VOUT, and ripple amplitude to maintain stable frequency under steady-state conditions.

It supports dual power inputs: VIN (up to 6.5 V) powers the high-side FET and internal logic, while V5IN (4.5–6.5 V) supplies analog circuitry and gate drive. The MODE pin selects among eight configurations - including SKIP, RR (ripple reduction), and PWM modes - each tied to specific resistor values and light-load behavior, with full protection including OVP (120% × VREFIN), UVP (68% × VREFIN), and valley-current overcurrent limiting (7.6 A positive, –9.3 A negative).

Key Specifications

Pinout & Package

TPS51317RGBT is housed in a thermally enhanced 20-pin QFN package (3.5 mm × 4 mm, RGB suffix) with an exposed power pad (PGND-connected) for optimal thermal performance. Pin numbering follows standard top-view orientation per TI SLUSAH9.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS51362RGER and MP2315GJ-Z, the TPS51317RGBT uniquely balances Intel-compatible droop/non-droop operation, D-CAP+™ sub-10-µs transient response, and minimal external component count in a 3.5-mm × 4-mm footprint - making it the preferred choice for embedded CPU and SoC core rails where space, speed, and specification alignment are critical.

Availability

TPS51317RGBT is available at Aetrix Electronics and suitable for Intel system agent power delivery, low-power SoC core supplies, DDR memory termination, and embedded FPGA core rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS51317RGBT 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 and power integrity solutions.

The TPS51317RGBT belongs to TI's D-CAP+™ synchronous buck converter product line, designed specifically for high-performance, space-constrained core voltage regulation in Intel-compatible and general-purpose SoC/FPGA applications.

FAQ

What is the maximum continuous output current supported by the TPS51317RGBT?

The TPS51317RGBT supports up to 6 A of continuous DC output current using its integrated high-side and low-side power FETs. This rating is validated across the full operating temperature range (–40°C to 85°C) with appropriate PCB thermal design, including connection of the exposed thermal pad to a solid PGND plane. Derating applies above 70°C ambient per thermal metrics in the datasheet.

How does the MODE pin configure switching frequency and light-load behavior in the TPS51317RGBT?

The MODE pin on the TPS51317RGBT accepts eight discrete resistor values (0 kΩ to open) to select among three operational modes - SKIP, RR (ripple reduction), and PWM - and four frequencies (800 kHz, 1 MHz, 1.2 MHz, 1.5 MHz). For example, a 22-kΩ resistor configures 1.5-MHz SKIP mode, while a 47-kΩ resistor selects 800-kHz RR mode. Each combination is defined in Table 4 of the SLUSAH9 datasheet.

Can the TPS51317RGBT operate with only ceramic output capacitors?

Yes, the TPS51317RGBT fully supports all-MLCC output capacitor configurations without requiring POSCAP or SP-CAP types. Its D-CAP+™ control architecture and optimized internal compensation enable stable operation with low-ESR ceramic capacitors, reducing BOM cost, improving reliability, and simplifying supply chain logistics compared to hybrid capacitor solutions.

What protection features are built into the TPS51317RGBT?

The TPS51317RGBT integrates comprehensive protection: output overvoltage (OVP at 120% × VREFIN), undervoltage (UVP at 68% × VREFIN), thermal shutdown (latch-off at 145°C with 10°C hysteresis), valley-current overcurrent limiting (7.6 A positive, –9.3 A negative), and 5-V input UVLO (4.37 V with 440-mV hysteresis). All protections trigger PGOOD de-assertion and controlled soft-stop behavior.

Is the TPS51317RGBT pin-compatible with other devices in the TPS513xx family?

No, the TPS51317RGBT is not pin-compatible with other TPS513xx variants such as TPS51315 or TPS51362. Its 20-pin RGB QFN package, pin assignment (e.g., dedicated V5IN, REFIN, MODE), and internal feature set (D-CAP+™, droop/non-droop support) are unique to this part number. PCB layout and schematic must be designed specifically for TPS51317RGBT.