Texas Instruments TPS57112CQRTERQ1

Overview

TPS57112CQRTERQ1 from Texas Instruments is an automotive-grade synchronous buck converter delivering up to 2 A continuous output current with input voltage range 2.95 V to 6 V, fixed 0.8 V ±1% reference, 200 kHz–2 MHz adjustable switching frequency, and integrated 12-mΩ high-side/13-mΩ low-side MOSFETs - used for point-of-load regulation in ADAS camera modules and infotainment head units.

For engineers reviewing the TPS57112CQRTERQ1 datasheet, TPS57112CQRTERQ1 pinout, TPS57112CQRTERQ1 application, or TPS57112CQRTERQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C ambient), 3-mm × 3-mm WQFN thermal pad package, power-good accuracy (±2% hysteresis), and external clock synchronization capability via RT/CLK pin.

Technical Context

The TPS57112CQRTERQ1 implements peak-current-mode control with internal slope compensation to prevent subharmonic oscillation across 0–100% duty cycle. Its PLL-synchronized RT/CLK interface supports external clock locking with ≤90 ns delay and 42 μs lock-in time at 500 kHz.

It features dual-stage shutdown logic: EN pin enables/disables operation with programmable UVLO (2.45 V default start), while PWRGD provides open-drain fault signaling for undervoltage (91% Vref), overvoltage (109% Vref), thermal shutdown, and overcurrent events - all with 2% hysteresis on VSENSE threshold detection.

Key Specifications

Pinout & Package

TPS57112CQRTERQ1 uses a thermally enhanced 16-pin WQFN package (3.00 mm × 3.00 mm) with exposed thermal pad soldered to PCB ground plane for junction-to-board thermal resistance of 3.8°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS57112CQRTERQ1, TPS54418RTER offers identical functionality without automotive qualification, while LM61480QRNTRQ1 trades pin compatibility for higher current and wider input range - making TPS57112CQRTERQ1 optimal for space-constrained, AEC-Q100–mandated 2-A point-of-load designs.

Availability

TPS57112CQRTERQ1 is available at Aetrix Electronics and suitable for infotainment head units, ADAS camera modules, hybrid instrument clusters, telematics control units, and point-of-load regulation requiring stable component supply across automotive production lifecycles.

Supply support for TPS57112CQRTERQ1 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 automotive ICs, with decades of automotive qualification expertise and broad manufacturing scale.

The TPS57112CQRTERQ1 belongs to TI's automotive-qualified DC/DC converter portfolio, designed specifically for high-reliability, thermally constrained point-of-load applications in infotainment, ADAS, and body electronics.

FAQ

What is the minimum input voltage required for TPS57112CQRTERQ1 to start switching?

The TPS57112CQRTERQ1 has a factory-set undervoltage lockout (UVLO) start threshold of 2.45 V. When VIN rises above this level, the device initiates soft-start and begins switching. This value is guaranteed across temperature and process variation per the datasheet's electrical characteristics table, and can be increased using external resistors on the EN pin.

Does TPS57112CQRTERQ1 support external clock synchronization, and what is the timing tolerance?

Yes, TPS57112CQRTERQ1 supports external clock synchronization via the RT/CLK pin. It features an internal PLL that locks to external clock frequencies between 300 kHz and 2 MHz, with a measured delay of 90 ns from CLK falling edge to PH rising edge and 42 µs lock-in time at 500 kHz - enabling precise EMI spread-spectrum coordination in multi-rail systems.

How does the PWRGD signal behave during overvoltage and undervoltage conditions on TPS57112CQRTERQ1?

The PWRGD pin on TPS57112CQRTERQ1 asserts low when VSENSE falls below 91% of the 0.8 V reference (undervoltage fault) or rises above 109% (overvoltage fault), with 2% hysteresis. During overvoltage, the high-side MOSFET is disabled until VSENSE drops below 107%, ensuring safe recovery before re-enabling regulation - a behavior confirmed in Section 7.3.4 of the datasheet.

Can TPS57112CQRTERQ1 operate at 100% duty cycle, and under what conditions?

Yes, TPS57112CQRTERQ1 supports near-100% duty cycle operation when the BOOT-to-PH voltage remains above 2.2 V. This condition allows the high-side MOSFET to remain continuously on, enabling minimal dropout operation - essential for automotive cold-crank scenarios where VIN may dip close to VOUT. The BOOT UVLO circuit disables the high-side only if BOOT-PH falls below this threshold.

What is the recommended slow-start capacitor value for TPS57112CQRTERQ1 to achieve a 5-ms ramp time?

Using the internal 2 µA SS/TR charge current and 0.8 V reference, the required capacitor is calculated as C = (t × I) / V = (5 ms × 2 µA) / 0.8 V = 12.5 nF. A standard 12 nF or 15 nF X7R ceramic capacitor is recommended - verified in Section 7.4.3 of the datasheet and validated in typical application schematics.