Texas Instruments TPS84A20RVQT

Overview

TPS84A20RVQT from Texas Instruments is a 10-A synchronous buck DC/DC power module integrating MOSFETs, inductor, and passives in a 10-mm × 10-mm × 4.3-mm QFN package. It delivers adjustable output voltage from 0.6 V to 5.5 V with ±1% set-point accuracy, supports 200 kHz–1.2 MHz switching frequency, and achieves up to 95% efficiency at 12-V input and 5-V output. It powers FPGA, DSP, and PCI Express point-of-load rails in compact infrastructure equipment.

For engineers reviewing the TPS84A20RVQT datasheet, TPS84A20RVQT pinout, TPS84A20RVQT application, or TPS84A20RVQT equivalent, key selection criteria include its integrated thermal performance (13.3°C/W), programmable UVLO and slow-start, parallel operation capability via ISHARE, and EN55022 Class B emissions compliance - all critical for high-density, thermally constrained embedded power designs.

Technical Context

The TPS84A20RVQT implements a current-mode synchronous buck topology with internal gate drivers, integrated power stage (PH pins), and analog control loop referenced to AGND. Its oscillator includes PLL-based synchronization capability, enabling external clock alignment and 180° out-of-phase SYNC_OUT generation for multi-module interleaving.

It features dual-input rail support (PVIN for power switches, VIN for bias circuitry), remote sensing via SENSE+, and configurable protection including cycle-by-cycle or hiccup-mode overcurrent (OCP_SEL), thermal shutdown at 175°C, and precise PWRGD monitoring with ±6% window and hysteresis.

Key Specifications

Pinout & Package

TPS84A20RVQT uses a 42-pin QFN package (RVQ) with exposed thermal pad, measuring 10 mm × 10 mm × 4.3 mm. The package supports standard reflow profiles (peak 245°C, up to 3 reflows) and meets UL 94 V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS84A20RVQT, the TPS84A21RVQT offers higher current capacity at the expense of slightly reduced thermal performance, while the LMZ31506RVQR trades feature depth and scalability for smaller footprint and lower cost in less demanding applications.

Availability

TPS84A20RVQT is available at Aetrix Electronics and suitable for FPGA power delivery, DSP core regulation, and PCIe slot power applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS84A20RVQT 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 power conversion ICs and modules.

The TPS84A20RVQT belongs to TI's SWIFT™ family of integrated power modules, engineered specifically for high-current, low-profile point-of-load applications in communications infrastructure, test equipment, and programmable logic systems.

FAQ

What is the minimum input voltage required for TPS84A20RVQT operation?

The TPS84A20RVQT supports a minimum PVIN of 2.95 V - but only when VOUT ≥ 0.6 V and the condition (VOUT + 0.7 V) ≤ PVIN is met. For example, at 0.9-V output, PVIN must be ≥1.6 V; however, the absolute minimum remains 2.95 V per datasheet specification. VIN must remain ≥4.5 V regardless of PVIN level. This dual-rail architecture allows operation in low-input scenarios where bias remains stable.

How does the ISHARE pin enable parallel operation of multiple TPS84A20RVQT modules?

The ISHARE pin on each TPS84A20RVQT connects to identical pins on other modules to form a current-sharing bus. Internal circuitry adjusts duty cycle dynamically to equalize average output current across all paralleled units. No external controller or resistors are needed - the function operates automatically when ISHARE pins are shorted and modules share common VOUT and PGND planes.

Can TPS84A20RVQT start up into a prebiased output voltage?

Yes, the TPS84A20RVQT supports prebias start-up: when enabled via proper configuration of INH/UVLO and SS/TR, it prevents reverse current flow into a precharged VOUT rail. This avoids potential damage to downstream components and ensures controlled ramp-up even when the output capacitor is already charged to near-regulation voltage before device enable.

What is the recommended input capacitance for TPS84A20RVQT at 12-V input?

At 12-V input, TI specifies a minimum of 44 µF ceramic capacitance across PVIN and PGND, plus an additional 100 µF bulk (e.g., polymer-aluminum) capacitor. A 0.1-µF ceramic capacitor must also be placed directly between PVIN and PGND pins. Total effective capacitance must meet ripple current rating requirements - ≥5 Arms at worst-case 50% duty cycle and full load.

Does TPS84A20RVQT require external compensation components?

No, the TPS84A20RVQT is a fully integrated power module with internal loop compensation. Unlike discrete buck controllers, it eliminates the need for external compensation networks, error amplifiers, or frequency compensation components - reducing design time and layout sensitivity while ensuring stable operation across all supported output voltages and loads.