Texas Instruments TPS568215RNNT

Overview

TPS568215RNNT from Texas Instruments is an 8-A synchronous step-down DC/DC converter with integrated 19-mΩ high-side and 9.4-mΩ low-side MOSFETs, D-CAP3™ adaptive on-time control, and selectable 400/800/1200 kHz switching frequency. It delivers 0.6–5.5 V output across –40°C to 150°C junction temperature in a 3.5-mm × 3.5-mm HotRod™ QFN package, targeting point-of-load regulation for FPGAs and DSPs.

For engineers reviewing the TPS568215RNNT datasheet, TPS568215RNNT pinout, TPS568215RNNT application, or TPS568215RNNT equivalent, key selection factors include its adjustable valley current limit (6–10.8 A), ±1% reference accuracy over full temperature range, FCCM/Eco-mode™ mode selection via MODE pin resistor divider, and compatibility with all-ceramic output capacitors without external compensation.

Technical Context

The TPS568215RNNT implements D-CAP3™ control with internal ripple injection-zero location shifts with selected FSW (7.1 kHz at 400 kHz, 14.3 kHz at 800 kHz, 21.4 kHz at 1200 kHz)-enabling stable operation with ultra-low-ESR ceramic capacitors and eliminating need for external loop compensation. Its adaptive on-time architecture dynamically adjusts high-side on-time based on VIN, VOUT, and pseudo-fixed frequency.

Operation supports dual current-limit configurations (ILIM-1 = 6–8.15 A, ILIM = 8–10.8 A), programmable soft-start via SS pin capacitor, monotonic startup into pre-biased outputs, and optional external 5-V bias on VREG5 to reduce quiescent current draw from VIN. Thermal shutdown activates at 160°C with 15°C hysteresis.

Key Specifications

Pinout & Package

TPS568215RNNT uses a thermally optimized 18-pin VQFN (RNN) package with 0.5-mm pitch, 3.5-mm × 3.5-mm body, and exposed power ground paddle for enhanced heat dissipation. Pin 1 marked via top-side dot; pins 3/4/5/8/9/10 are PGND; pins 6/7 are SW; pin 12 is AGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS568215RNNT, TPS568231RNNT offers reduced feature set but lower unit cost and simpler configuration, while TPS56C215RNNR provides headroom for current scaling at the expense of higher RDS(on) trade-offs and increased solution size.

Availability

TPS568215RNNT is available at Aetrix Electronics and suitable for server power delivery, telecom point-of-load regulation, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS568215RNNT 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 TPS568215RNNT belongs to TI's SWIFT™ monolithic buck converter family, engineered for space-constrained, high-density power systems in datacenter, networking, and industrial automation where thermal performance and design simplicity are critical.

FAQ

What is the maximum continuous output current supported by the TPS568215RNNT?

The TPS568215RNNT is rated for 8 A continuous output current under recommended operating conditions. Its absolute maximum rating is 10 A, but sustained operation above 8 A requires thermal derating per TI's 100k-hour reliability guideline at 105°C junction temperature. The device achieves this with integrated 19-mΩ/9.4-mΩ MOSFETs and a thermally enhanced 3.5-mm × 3.5-mm HotRod™ QFN package.

How does the MODE pin configure switching frequency and current limit on the TPS568215RNNT?

The MODE pin on the TPS568215RNNT accepts a resistor divider from VREG5 to AGND to select one of 12 operating modes. Specific combinations set FSW (400/800/1200 kHz), valley current limit (ILIM-1 = 6–8.15 A or ILIM = 8–10.8 A), and light-load mode (FCCM or Eco-mode™). Configuration is latched at power-up and requires VIN cycling to change.

Can the TPS568215RNNT operate with ceramic output capacitors only?

Yes, the TPS568215RNNT fully supports all-ceramic output capacitors due to its D-CAP3™ control architecture with internal ripple injection. This eliminates the need for tantalum or polymer capacitors traditionally used for ESR-based stability. Designs using ≥10 µF total ceramic capacitance achieve stable regulation across load and line transients without external compensation components.

What is the purpose of the VREG5 pin on the TPS568215RNNT, and how should it be used?

The VREG5 pin on the TPS568215RNNT is both the output of an internal 4.7-V LDO and an input for external 5-V bias. Bypassing it with a 4.7-µF capacitor is mandatory. Applying an external 5-V supply improves light-load efficiency by shifting quiescent current away from VIN. The UVLO circuit monitors VREG5, disabling the converter if voltage falls below 3.34 V (falling) or rises above 4.5 V (rising).

Is the TPS568215RNNT pin-to-pin compatible with other TI buck converters?

Yes, the TPS568215RNNT is pin-to-pin compatible with the 8-A TPS568231RNNT and the 12-A TPS56C215RNNR/TPS56C231RNNT in the same 18-pin RNN package. This enables scalable power design - users can upgrade current capability or adjust features (e.g., add FCCM) without PCB layout changes, provided thermal and layout margins accommodate the higher-rated variant.