Texas Instruments TPS543A22RYSR

Overview

TPS543A22RYSR from Texas Instruments is a 12A synchronous step-down DC/DC converter with integrated 6.5mΩ/2mΩ MOSFETs, fixed-frequency advanced current mode (ACM) control, and true differential remote sense. It operates from 4V–18V input, delivers 0.5V–7V output, and supports up to 2.2MHz switching for compact power designs in telecom infrastructure and optical networking.

For engineers reviewing the TPS543A22RYSR datasheet, TPS543A22RYSR pinout, TPS543A22RYSR application, or TPS543A22RYSR equivalent, key selection criteria include its internally compensated ACM loop, selectable 500kHz–2.2MHz frequency, monotonic prebiased start-up, ±0.5% reference accuracy over –40°C to 150°C, and 2.5mm × 4.5mm WQFN-HR thermal package.

Technical Context

The TPS543A22RYSR implements an emulated peak current-mode (ACM) architecture with three programmable PWM ramp options-enabling stable operation with low-ESR MLCC output capacitors without external compensation. Its internal ramp generator provides high noise immunity and eliminates need for complex RC networks.

Control logic integrates dual UVLO thresholds (VIN and EN), synchronized soft-start (1/2/4/8ms), and configurable current limiting (12A/8A via MSEL). Fault protection includes OVP/UVP on VOUT, input UVLO, overcurrent (HS/LS), and thermal shutdown at 165°C with 12°C hysteresis.

Key Specifications

Pinout & Package

TPS543A22RYSR uses a 2.5mm × 4.5mm, 17-pin WQFN-HR (RYS) package with 0.5mm pitch and exposed thermal pad. The package features four VIN pins, four PGND pins, and dedicated AGND for analog integrity - optimized for high-current, low-noise buck conversion.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS543A22RYSR, TPS543B22RQW offers headroom for higher current while sharing identical control features and layout, whereas TPS543A26RTER trades thermal performance for footprint reduction - neither is drop-in compatible without validation of thermal and ripple performance.

Availability

TPS543A22RYSR is available at Aetrix Electronics and suitable for wireless infrastructure, optical networking, and medical imaging applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS543A22RYSR 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 technologies, with decades of expertise in high-reliability DC/DC conversion.

The TPS543A22RYSR belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for high-density, high-efficiency point-of-load power in telecom, enterprise networking, and industrial systems demanding precision regulation and robust fault handling.

FAQ

What is the maximum recommended operating junction temperature for the TPS543A22RYSR?

The TPS543A22RYSR has a maximum operating junction temperature of 150°C, with thermal shutdown activated at 165°C (typical) and 12°C hysteresis. This rating enables deployment in high-ambient environments such as outdoor 5G base stations and sealed medical enclosures where airflow is limited. Derating curves in the datasheet confirm full 12A output is sustainable up to 105°C ambient with proper PCB thermal design.

How does the TPS543A22RYSR achieve stable operation without external compensation components?

The TPS543A22RYSR uses an internally compensated advanced current mode (ACM) control architecture with three selectable internal PWM ramp options. These ramps emulate inductor current for precise peak-current sensing, enabling stable loop behavior with ceramic output capacitors and eliminating the need for external Type-II or Type-III compensation networks. Ramp selection is configured via a single MSEL resistor to AGND.

Can the TPS543A22RYSR be synchronized to an external clock, and what are the timing constraints?

Yes, the TPS543A22RYSR can synchronize to an external clock applied to the SYNC/FSEL pin. The external clock must have 20%–80% duty cycle and fall within ±20% of the internally programmed switching frequency. If applied before startup, no RFSEL resistor is needed; if applied after startup, synchronization begins after four consecutive matching cycles. Loss of sync reverts to the internal oscillator frequency.

What is the purpose of the GOSNS pin on the TPS543A22RYSR, and how must it be connected?

The GOSNS pin is the ground-sense return input for the true differential remote sense amplifier. It must be connected directly to the load ground point - not the IC's PGND - to measure the voltage drop across PCB traces between the converter and load. Paired with FB, it enables the TPS543A22RYSR to regulate output voltage precisely at the load, compensating for up to ±100mV common-mode offset and maintaining ±0.5% accuracy under varying load currents.

Does the TPS543A22RYSR support monotonic start-up into a prebiased output, and how is it implemented?

Yes, the TPS543A22RYSR supports monotonic start-up into prebiased outputs. During enable, the controller actively monitors the SW node and modulates the high-side FET to prevent reverse current flow from the output into the inductor. This behavior is inherent to the ACM control architecture and requires no external circuitry - ensuring safe power sequencing in multi-rail systems where downstream supplies may be active before the TPS543A22RYSR is enabled.