Texas Instruments TPS628512DRLR

Overview

TPS628512DRLR from Texas Instruments is a 2-A continuous, synchronous step-down DC/DC converter in an 8-pin SOT583 package, operating from 2.7 V to 6 V input and delivering adjustable output voltage from 0.6 V to 5.5 V with 1% feedback accuracy over –40°C to +150°C junction temperature. It features 2.25 MHz fixed PWM switching, forced-PWM/PFM mode selection via MODE/SYNC pin, 17 µA quiescent current, and active output discharge-used in factory automation power rails requiring high efficiency and compact footprint.

For engineers reviewing the TPS628512DRLR datasheet, TPS628512DRLR pinout, TPS628512DRLR application, or TPS628512DRLR equivalent, key selection considerations include its 2-A continuous output rating, SOT583 thermal performance (R_θJA = 110°C/W on JEDEC board), soft-start control via SS/TR pin, power-good window comparator, and external synchronization capability from 1.8 MHz to 4 MHz.

Technical Context

The TPS628512DRLR implements peak current mode control with internal compensation, enabling stable regulation using low-ESR ceramic capacitors without mandatory feedforward components. Its control loop supports seamless transition between PWM and PFM modes based on load, with automatic entry into power-save mode below ~0.8 A peak inductor current.

It integrates dual MOSFETs with 65 mΩ (high-side) and 33 mΩ (low-side) typical R_DS(on) at V_IN ≥ 5 V, enabling high-efficiency operation across 2.7–6 V input range. The device supports 100% duty-cycle operation for low-dropout scenarios and includes precise enable thresholding (1.05–1.15 V rising), thermal shutdown at 170°C with 15°C hysteresis, and open-drain PG output with 92–98% UVP and 107–113% OVP thresholds relative to V_FB.

Key Specifications

Pinout & Package

TPS628512DRLR is housed in an 8-pin SOT583 package (1.60 mm × 2.10 mm, including pins), optimized for high power density and thermal performance on standard 4-layer JEDEC PCBs (R_θJA = 110°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS628511DRLR, the TPS628512DRLR delivers double the continuous current in identical area; versus TPS628513DRLR, it offers tighter R_DS(on) and lower thermal stress at 2-A steady loads, improving long-term reliability in thermally constrained enclosures.

Availability

TPS628512DRLR is available at Aetrix Electronics and suitable for factory automation, building automation, and test and measurement equipment requiring stable component supply, consistent parametric performance, and long-term production support.

Supply support for TPS628512DRLR 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 TPS62851x product line was designed specifically for space-constrained industrial and automation systems needing high-efficiency, thermally robust, and easily configurable POL solutions in ultra-small packages like SOT583.

FAQ

What is the maximum continuous output current rating for the TPS628512DRLR?

The TPS628512DRLR is rated for 2-A continuous output current at a junction temperature of 105°C, as specified in the Recommended Operating Conditions table (Section 7.3) of the official datasheet. This rating assumes proper PCB thermal design per JEDEC 4-layer board guidelines and use of recommended 0.47 µH inductor and 2 × 10 µF output capacitance.

Does the TPS628512DRLR support external clock synchronization, and what is the valid frequency range?

Yes, the TPS628512DRLR supports external clock synchronization via the MODE/SYNC pin across a range of 1.8 MHz to 4 MHz, as confirmed in Section 7.5 Electrical Characteristics and Section 9.3.2 of the datasheet. The device locks to the external clock on falling edges and maintains phase coherence, enabling deterministic timing in multi-converter systems without additional passive components.

How does the soft-start function work on the TPS628512DRLR, and how is ramp time controlled?

The TPS628512DRLR uses an internal 2.5 µA current source to charge an external capacitor connected between the SS/TR pin and GND, defining the output voltage ramp time. As detailed in Section 9.4.7, the required capacitance is calculated as C_SS = (2.5 µA × t_ramp) / 0.6 V. Leaving SS/TR unconnected yields a typical 160 µs ramp; adding a 4.7 nF capacitor achieves ~1 ms, enabling controlled inrush limiting and supply sequencing.

What is the purpose and behavior of the power-good (PG) output on the TPS628512DRLR?

The PG pin on the TPS628512DRLR is an open-drain output driven by a window comparator monitoring V_FB. It remains low during startup, thermal shutdown, UVLO, or when V_OUT deviates outside 92–98% (UVP) or 107–113% (OVP) of the target, and transitions to high-impedance only when regulation is stable. Per Section 9.3.5, it requires an external pullup and features a 40 µs deglitch time to reject noise-induced false triggers.

Can the TPS628512DRLR operate with input voltage equal to the output voltage, and how is this achieved?

Yes, the TPS628512DRLR supports 100% duty-cycle operation, as described in Section 9.4.3. When V_IN approaches V_OUT, the controller holds the high-side FET continuously on (with low-side FET off) until V_OUT reaches regulation. The effective dropout is determined by I_OUT × R_{DS(on)_HS}, enabling operation down to V_IN ≈ V_OUT + 130 mV at 2 A (using typical 65 mΩ R_DS(on)).