Texas Instruments TPS628303ADRLR

Overview

TPS628303ADRLR from Texas Instruments is a 3-A synchronous step-down DC/DC converter in an 8-pin SOT583 package, supporting 2.25V–5.5V input and 0.5V–4.5V adjustable output with 1% feedback voltage accuracy across –40°C to 125°C. It employs DCS-Control topology, delivers 7 µA quiescent current, operates at 2.0 MHz, and integrates power-good, active output discharge, and hiccup-mode overcurrent protection - used in ASIC/SoC core supplies for industrial PCs and embedded vision systems.

For engineers reviewing the TPS628303ADRLR datasheet, TPS628303ADRLR pinout, TPS628303ADRLR application, or TPS628303ADRLR equivalent, key selection considerations include its 3-A output capability in compact SOT583, 1% V_FB accuracy over full temperature range, MODE pin for PSM/PWM mode selection, integrated EMI-reduction features (on-chip noise-filtering capacitors), and compatibility with prebiased start-up and 100% duty-cycle operation.

Technical Context

The TPS628303ADRLR implements DCS-Control topology with adaptive constant-on-time modulation, enabling seamless transition between PWM (2 MHz fixed) and PFM modes based on load. Its fast comparator improves transient response while maintaining stability with small output capacitance.

It integrates dual power MOSFETs (35 mΩ HS / 18 mΩ LS), supports 100% duty cycle for ultra-low dropout, and uses a dedicated VOS pin for accurate output voltage sensing after the inductor. Protection includes thermal shutdown (150°C trip, 20°C hysteresis), hiccup-mode OCP, and UVLO (2.15 V rising threshold).

Key Specifications

Pinout & Package

TPS628303ADRLR is housed in an 8-pin SOT583 package (1.6 mm × 2.1 mm, 0.35 mm height), optimized for automated assembly and thermal performance on standard PCBs. The package exposes the die pad to GND for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with TPS628303ARZER, the TPS628303ADRLR trades 5.2°C/W higher junction-to-ambient thermal resistance for easier SMT assembly and robust mechanical reliability; versus TPS62863ARDGR, it provides full adjustability, precision sensing, and mode control at the cost of slightly higher IQ and component count.

Availability

TPS628303ADRLR is available at Aetrix Electronics and suitable for industrial PC power rails, ASIC core supplies, analog security camera subsystems, and portable SSD controller applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TPS628303ADRLR 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 company headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and digital signal processing technologies since 1930.

The TPS62830x family was developed specifically for high-efficiency, low-noise point-of-load conversion in space- and thermal-constrained industrial and computing applications, emphasizing precision regulation, EMI robustness, and seamless integration with complex SoCs and FPGAs.

FAQ

What is the maximum output current capability of the TPS628303ADRLR?

The TPS628303ADRLR is rated for 3 A continuous output current under recommended operating conditions (TJ ≤ 125°C). Its actual deliverable current depends on PCB thermal design - with a 2-layer board and 1-in² copper pour, it sustains 3 A at ambient up to 60°C. Derating is required above that, per the RθJB = 22.2°C/W thermal metric in the SOT583 package.

Does the TPS628303ADRLR support prebiased start-up?

Yes, the TPS628303ADRLR supports prebiased start-up: it can be enabled into an already-biased output without causing reverse current or latch-up. This behavior is confirmed in Section 7.3.3 of the datasheet. However, active output discharge must be disabled via VIN removal before first enable to avoid conflict during initial power application.

How does the MODE pin affect efficiency and output ripple in the TPS628303ADRLR?

When the MODE pin is pulled low, the TPS628303ADRLR operates in auto PSM/PWM mode - achieving >90% efficiency at 1 mA load but with variable-frequency ripple. When pulled high, it forces fixed 2 MHz PWM mode - reducing output ripple by ~5× and stabilizing EMI spectrum, at the cost of ~2× higher light-load IQ (e.g., 15 µA vs 7 µA at 100 µA load).

What is the purpose of the VOS pin on the TPS628303ADRLR?

The VOS (Voltage Output Sense) pin on the TPS628303ADRLR provides Kelvin sensing of the output voltage directly at the load side of the inductor. This compensates for IR drop across the inductor's DCR and PCB traces, enabling tighter regulation accuracy - especially critical for low-voltage, high-current rails like 1.2 V ASIC cores where even 20 mV error impacts timing margins.

Can the TPS628303ADRLR operate with a 2.5 V input and 1.8 V output?

Yes, the TPS628303ADRLR fully supports 2.5 V input and 1.8 V output: its 2.25–5.5 V input range and 0.5–4.5 V adjustable output cover this combination. At this condition, it operates in 100% duty-cycle mode only if VIN drops near VOUT; otherwise, normal PWM regulation applies. Efficiency exceeds 88% at 3 A load per typical curves in Figure 6-5 of the datasheet.