Texas Instruments TPS628511DRLR

Overview

TPS628511DRLR from Texas Instruments is a 1-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 voltages from 0.6 V to 5.5 V with 1% feedback voltage accuracy over –40°C to +150°C junction temperature. It features 2.25 MHz fixed-frequency PWM operation, forced-PWM/PFM mode selection via MODE/SYNC pin, and active output discharge for controlled power-down in motor drive and factory automation power rails.

For engineers reviewing the TPS628511DRLR datasheet, TPS628511DRLR pinout, TPS628511DRLR application, or TPS628511DRLR equivalent, key selection considerations include its 1-A continuous output rating, 17 µA quiescent current in light-load PFM mode, precise ENABLE threshold (1.1 V rising), power-good window comparator, and external synchronization capability from 1.8 MHz to 4 MHz - all critical for compact, high-efficiency point-of-load designs requiring thermal robustness and rail sequencing.

Technical Context

The TPS628511DRLR implements peak current mode control with internal compensation, enabling stable regulation using low-ESR ceramic capacitors without mandatory feedforward components. Its dual-mode operation - forced PWM (MODE/SYNC = high) or automatic PWM/PFM (MODE/SYNC = low) - dynamically optimizes efficiency across load ranges while maintaining 2.25 MHz base frequency.

It integrates precision analog functions including a 1% accurate 0.6-V reference, active output discharge (100 Ω), 100% duty-cycle capability for ultra-low dropout, and a window-comparator-based open-drain PG output with 92–98% rising and 87–93% falling thresholds relative to VFB - all validated across TJ = –40°C to +150°C.

Key Specifications

Pinout & Package

The TPS628511DRLR is housed in an 8-pin SOT583 package (1.60 mm × 2.10 mm, 0.47 mm pitch), optimized for high power density and thermal performance (R_θJA = 110°C/W on JEDEC 4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS628511DRLR, TPS628512DRLR delivers double the current in identical packaging but trades off light-load efficiency and thermal headroom, while TPS628641DRLR reduces size and IQ but sacrifices critical system-level features like power-good signaling and external clock alignment - making TPS628511DRLR the optimal balance for industrial and motor-control POLs requiring reliability, flexibility, and diagnostics.

Availability

TPS628511DRLR is available at Aetrix Electronics and suitable for motor drives, factory automation systems, and building automation equipment requiring stable component supply, long-term manufacturability, and AEC-Q100–compatible thermal resilience.

Supply support for TPS628511DRLR 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 DC/DC conversion for industrial and automotive markets.

The TPS62851x product line was designed specifically for space-constrained, thermally demanding point-of-load applications in motor control, PLCs, and smart sensors - emphasizing high efficiency across load range, precise rail control, and robust fault handling without external complexity.

FAQ

What is the maximum continuous output current rating for the TPS628511DRLR?

The TPS628511DRLR is rated for 1-A continuous output current at junction temperatures up to 105°C. Its peak current limit is 2.6 A (typical), and it supports 3-A peak operation under short-duration transients per TI's characterization data. Derating is required above 105°C ambient or with insufficient PCB copper area.

Does the TPS628511DRLR support external clock synchronization, and what is the valid frequency range?

Yes, the TPS628511DRLR supports external clock synchronization via the MODE/SYNC pin across 1.8 MHz to 4 MHz. The device locks to the external signal within 50 µs and maintains phase alignment - critical for EMI reduction and multi-rail coordination. No external passive components are needed for synchronization.

How does the soft-start function work on the TPS628511DRLR, and can it be used for voltage tracking?

The TPS628511DRLR uses an internal 2.5 µA current source to charge an external capacitor on the SS/TR pin, defining output voltage ramp time. It also supports voltage tracking: applying an external reference to SS/TR causes VOUT to follow that source with 1× gain and ±1 mV offset - enabling precise sequencing of multiple rails without additional ICs.

What is the purpose and behavior of the power-good (PG) output on the TPS628511DRLR?

The PG pin on the TPS628511DRLR is an open-drain output driven by a window comparator monitoring VFB. It asserts low during device disable, UVLO, thermal shutdown, soft start, or when VOUT deviates outside 92–98% (rising) or 87–93% (falling) of target. A 10-kΩ pullup to VIN is recommended, and its 40-µs deglitch time prevents false triggers from noise.

Is the TPS628511DRLR suitable for automotive applications, and what functional safety documentation is available?

The TPS628511DRLR is functional safety-capable with documentation available to aid ISO 26262 system design, including FIT rate, failure mode analysis, and diagnostic coverage reports. While not AEC-Q100 qualified itself, its –40°C to +150°C junction rating and robust protection features make it suitable for under-hood auxiliary supplies and ADAS domain controllers when used with appropriate system-level validation.