Texas Instruments TPS53513RVET

Overview

TPS53513 from Texas Instruments is a 8-A synchronous step-down DC-DC converter with D-CAP3™ adaptive on-time control, integrated 13.8-mΩ high-side and 5.9-mΩ low-side MOSFETs, 0.6-V ±0.5% reference voltage, 0.6-V to 5.5-V output range, and 250 kHz–1 MHz selectable switching frequency. It delivers high efficiency in server point-of-load and FPGA core supply applications.

For engineers reviewing the TPS53513 datasheet, TPS53513 pinout, TPS53513 application, or TPS53513 equivalent, key selection criteria include its auto-skip Eco-mode™ for light-load efficiency, forced continuous conduction mode (FCCM) for tight ripple control, precharged start-up capability, built-in output discharge, and open-drain PGOOD signaling - all in a compact 3.5 mm × 4.5 mm VQFN-CLIP package.

Technical Context

The TPS53513 implements D-CAP3™ control using emulated current sensing and adaptive on-time modulation, eliminating external compensation components while enabling ultra-fast load-step response. Its internal 5-V LDO (VREG) powers analog circuitry and gate drivers, and the VDD bias input supports 4.5-V to 25-V operation independent of VIN.

Switching frequency is resistor-programmable via the RF pin across eight discrete settings (250 kHz–1 MHz), while MODE pin selection enables FCCM or auto-skipping Eco-mode™. Overcurrent protection uses valley-current sensing with TRIP pin programmability, and thermal shutdown activates at 140°C with 40°C hysteresis.

Key Specifications

Pinout & Package

TPS53513 is housed in a 28-pin VQFN-CLIP (RVE) package measuring 3.50 mm × 4.50 mm with an exposed thermal pad for enhanced thermal performance. Pin functions are validated per TI SLUSBP9C Rev C datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS53513, TPS53632RGCR offers higher current and dual-phase support but demands layout changes and lacks identical pin compatibility, while MP2315GJ-Z reduces cost and size at the expense of precision, programmability, and feature depth required for high-performance digital loads.

Availability

TPS53513 is available at Aetrix Electronics and suitable for server point-of-load, FPGA core power, and optical transceiver bias applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS53513 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 TPS53513 belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for space-constrained, high-performance point-of-load applications in computing, networking, and communications infrastructure.

FAQ

What is the recommended input voltage range for TPS53513 operation?

The TPS53513 supports two independent input domains: VIN (1.5 V–18 V) for power conversion and VDD (4.5 V–25 V) for biasing the internal controller and LDO. This dual-input architecture allows flexible system-level power partitioning - for example, using a dedicated 12-V bias rail while converting 48-V intermediate bus down to 1.2 V. The VREG LDO output (5 V) powers internal circuitry and gate drivers, and its UVLO thresholds (3.12–3.41 V) ensure reliable startup and shutdown sequencing. Always verify both VIN and VDD remain within their respective absolute maximum ratings during transient conditions.

How does the TPS53513 achieve fast load-step response without external compensation?

The TPS53513 achieves sub-2 µs load-step recovery using D-CAP3™ adaptive on-time control, which embeds emulated current sensing and dynamically adjusts on-time based on output voltage deviation and input conditions. Unlike traditional voltage- or current-mode controllers, it requires no external RC compensation network because the control loop is inherently stable with ceramic-only output capacitors. This architecture eliminates phase-margin tuning, reduces design iterations, and maintains consistent transient performance across temperature and component tolerances - a key advantage confirmed in TI's Figure 19–20 load-transient waveforms showing <1.5% undershoot/overshoot at 6-A steps. The TPS53513 datasheet explicitly states "no requirement for compensation" as a core feature.

Can TPS53513 start up into a precharged output, and how is this enabled?

Yes, the TPS53513 supports precharged start-up, a critical feature for hot-swap and redundant power systems. It is enabled automatically when the VO pin senses a voltage ≥80% of the target VOUT before EN assertion. During start-up, the internal discharge circuit remains inactive, and the high-side MOSFET stays off until the FB voltage falls below the 0.6-V reference, preventing reverse current flow through the low-side FET. This behavior is verified in Figure 29 of the datasheet and requires no external components or configuration. The TPS53513 also includes built-in output discharge (active when EN = low) to rapidly collapse VOUT during shutdown, ensuring safe sequencing in multi-rail environments.

What are the thermal limitations and PCB layout recommendations for TPS53513?

The TPS53513 has a junction-to-case (bottom) thermal resistance of 2.2°C/W and a maximum junction temperature of 150°C. To maintain reliability, TI specifies a thermal pad (exposed die attach pad) that must be soldered to a solid PGND copper pour with ≥6 thermal vias (0.3-mm diameter, spaced ≤1 mm apart). Layout guidelines in Section 10 mandate short, wide traces for VIN, PGND, and SW nodes; separation of analog (GND, FB) and power grounds; and placement of the RF and MODE resistors close to their respective pins to minimize noise pickup. The RθJA of 37.5°C/W assumes JEDEC-standard high-K board testing - real-world performance depends heavily on proper thermal pad implementation and airflow (natural convection vs. 200 LFM).

How is overcurrent protection configured and what are its trip thresholds for TPS53513?

Overcurrent protection in the TPS53513 is configured via the TRIP pin, which sources a temperature-compensated 10-µA current (3000 ppm/°C) into an external resistor to set the valley-current limit. Using RTRIP = 34.8 kΩ yields a nominal OCL of 8.0 A (6.2–9.8 A over temperature), while RTRIP = 25.5 kΩ sets 6.2 A (4.2–8.2 A). The device also monitors negative current (–5.3 to –10.5 A) for reverse conduction protection. Trip thresholds are factory-trimmed and do not require calibration; the TRIP pin must not be left floating. This method replaces traditional sense-resistor networks, reducing component count and power loss - a design value directly stated in the "Features" section of the TPS53513 datasheet.