Texas Instruments TPS54202DDCT

Overview

TPS54202DDCT from Texas Instruments is a 4.5V to 28V input, 2A synchronous step-down DC/DC converter in SOT-23-6 package, integrating 148mΩ high-side and 78mΩ low-side MOSFETs, operating at fixed 500kHz switching frequency with spread-spectrum EMI reduction. It delivers regulated 5V/2A output for industrial power rails and consumer audio/STB systems.

For engineers reviewing the TPS54202DDCT datasheet, TPS54202DDCT pinout, TPS54202DDCT application, or TPS54202DDCT equivalent, key selection criteria include its 3μA shutdown current, internal 5ms soft-start, Eco-mode™ pulse skip for light-load efficiency, overcurrent hiccup protection, and thermal shutdown at 155°C - all validated for 12V/24V distributed bus supplies.

Technical Context

The TPS54202DDCT employs peak current-mode control with internal loop compensation and slope compensation to prevent sub-harmonic oscillation across full duty cycle. Its fixed 500kHz center frequency incorporates ±6% spread-spectrum jitter (1.024ms period) to reduce conducted EMI peaks.

It features dual-cycle-by-cycle overcurrent protection: high-side limit at 3.2A typical and low-side source limit at 3A typical, both triggering hiccup mode after 512 cycles of sustained overload. The integrated boot regulator requires a 0.1μF BOOT–SW capacitor and monitors BOOT–SW UVLO at 2.1V.

Key Specifications

Pinout & Package

SOT-23-6 (DDC) package: 2.9mm × 2.8mm footprint with 0.95mm height; thermally enhanced for 2A operation in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2307DN-LF-Z and RT7297CGJ6, the TPS54202DDCT uniquely combines EMI-reducing spread spectrum, ultra-low 3μA shutdown current, and dual-MOSFET hiccup protection - making it optimal for space-limited, noise-sensitive, and reliability-critical 12V/24V industrial and consumer power rails.

Availability

TPS54202DDCT is available at Aetrix Electronics and suitable for 12V/24V distributed power-bus supplies, consumer audio systems, and set-top box main power rails requiring stable component supply and long-term production continuity.

Supply support for TPS54202DDCT 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-reliability power conversion solutions.

The TPS54202DDCT belongs to TI's D-CAP2™ synchronous buck converter family, engineered for high-density, low-EMI, and high-efficiency point-of-load regulation in industrial, consumer, and computing applications.

FAQ

What is the recommended input capacitor configuration for TPS54202DDCT?

TI recommends a minimum 10μF ceramic input capacitor (X7R/X5R) placed close to VIN and GND pins, plus an optional 0.1μF high-frequency bypass capacitor. The TPS54202DDCT's internal 5ms soft-start and low 45μA quiescent current reduce inrush stress, but proper input decoupling remains essential to limit ripple and maintain stability under 2A load transients.

Does TPS54202DDCT support pre-biased output startup?

Yes, the TPS54202DDCT supports monotonic startup into pre-biased outputs: both high-side and low-side MOSFETs remain off until the internal soft-start voltage exceeds the FB pin voltage, preventing reverse current flow and output discharge. This behavior is confirmed in Section 6.3.6 of the TPS54202DDCT datasheet and applies across its full –40°C to 125°C operating junction temperature range.

What is the exact feedback reference voltage of TPS54202DDCT and how does it affect output accuracy?

The TPS54202DDCT uses a precision 0.596V ±2.5% internal reference voltage (VREF). When setting 5.0V output with a resistor divider, this tolerance contributes directly to output error - e.g., ±2.5% on 0.596V yields ±15mV baseline offset. Combined with 1% resistor tolerance, total output variation remains within ±2.8%, meeting requirements for STB and audio applications per TI's TPS54202DDCT design guidelines.

How does the TPS54202DDCT implement overcurrent protection, and what happens during sustained overload?

The TPS54202DDCT provides cycle-by-cycle overcurrent protection on both MOSFETs: high-side limit at 3.2A typical and low-side source limit at 3A typical. If overload persists beyond 512 switching cycles, it enters hiccup mode - disabling switching for 16384 cycles (~33ms at 500kHz) before attempting restart. This behavior is documented in Section 5.5 and 6.3.11 of the TPS54202DDCT datasheet and protects against thermal runaway.

Can TPS54202DDCT operate at 100% duty cycle, and under what conditions?

Yes, the TPS54202DDCT supports 100% duty cycle operation as long as the BOOT–SW voltage remains above 2.1V (typical UVLO threshold), enabled by its integrated boot recharge diode and external 0.1μF BOOT–SW capacitor. This capability allows dropout operation down to VIN ≈ VOUT + VDS(ON), critical for low-input-voltage scenarios like 5.5V-to-5V conversion in brownout conditions.