Texas Instruments TPS62112MRSAREP

Overview

TPS62112MRSAREP from Texas Instruments is a radiation-hardened, extended-temperature synchronous step-down DC-DC converter delivering fixed 5 V output at up to 1.5 A. It operates from 3.1 V to 17 V input, features 20 µA quiescent current in PFM mode, 1 MHz nominal switching frequency, and integrated N- and P-channel MOSFETs. It is designed for point-of-load regulation in harsh-environment electronics such as space-grade organizers, handheld scanners, and military avionics.

For engineers reviewing the TPS62112MRSAREP datasheet, TPS62112MRSAREP pinout, TPS62112MRSAREP application, or TPS62112MRSAREP equivalent, key selection criteria include its 5 V fixed output accuracy (±7%), –55°C to 125°C operating range, QFN-16 RSA package with exposed thermal pad, and SYNC-controlled PWM/PFM mode transition for noise-sensitive or ultra-low-power use cases.

Technical Context

The TPS62112MRSAREP implements voltage-mode control with input-voltage feedforward for fast line/load transient response. Its dual-MOSFET synchronous rectification eliminates external diode losses, enabling up to 95% efficiency across 100 mA–1.5 A loads. The internal 1.153 V reference and fixed-resistor feedback network ensure stable 5 V regulation without external divider components.

Operation switches between forced PWM (SYNC ≥1.5 V) for constant-frequency EMI control and automatic PFM (SYNC = GND) for 20 µA quiescent current at light loads. Undervoltage lockout (2.8–3.1 V hysteresis), overcurrent protection (2400 mA peak), and thermal shutdown (145°C) are fully integrated. The device supports 100% duty cycle for minimum dropout in battery-depletion scenarios.

Key Specifications

Pinout & Package

The TPS62112MRSAREP uses a 16-pin QFN (RSA) package with 4 mm × 4 mm body and exposed thermal pad soldered to AGND. Pin pitch is 0.65 mm; thermal pad dimensions are 2.5 mm × 2.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62112MRSAREP, TPS62111MRSAREP offers identical robustness but targets 3.3 V logic domains, while LMZ12003TZE/NOPB trades off 5 V fixed-output precision and QFN thermal performance for embedded inductance and higher current - making it suitable for rapid prototyping but less optimal for radiation-hardened or ultra-low-IQ deployments.

Availability

TPS62112MRSAREP is available at Aetrix Electronics and suitable for spacecraft power management, military handheld scanners, and avionics sensor nodes requiring stable component supply across extended temperature and radiation environments.

Supply support for TPS62112MRSAREP 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 high-reliability ICs for aerospace, industrial, and automotive markets.

The TPS6211x-EP product line delivers radiation-tolerant, extended-temperature synchronous buck converters optimized for point-of-load regulation in mission-critical systems where long-term reliability under thermal, mechanical, and radiation stress is mandatory.

FAQ

What is the output voltage tolerance of the TPS62112MRSAREP over its full operating temperature range?

The TPS62112MRSAREP has a fixed 5 V output with ±7% tolerance across –55°C to 125°C, including line and load regulation effects. This specification is verified per JEDEC JESD22-A104 temperature cycling and applies to all production units meeting MIL-PRF-38535 Class V requirements. The tolerance accounts for internal reference drift, MOSFET r_DS(on) variation, and feedback network mismatch - no external calibration is required. TPS62112MRSAREP maintains this accuracy without trimming resistors due to its factory-laser-trimmed internal divider.

Can the TPS62112MRSAREP operate with an input voltage lower than 3.1 V?

No, the TPS62112MRSAREP incorporates undervoltage lockout (UVLO) with a falling threshold of 2.8 V and hysteresis of 250 mV, meaning it will not start switching until VIN exceeds 3.05 V. Below 3.1 V, the device remains in shutdown with <2 µA current draw. Attempting operation below this limit risks undefined behavior, including failure to regulate or erratic PG assertion. For sub-3.1 V inputs, consider TI's TPS62864 or alternative low-VIN buck regulators. TPS62112MRSAREP is specifically validated only within its 3.1–17 V specified range.

How does the SYNC pin affect efficiency and noise performance in the TPS62112MRSAREP?

When SYNC is pulled high (>1.5 V), the TPS62112MRSAREP operates in forced PWM mode at fixed frequency (0.8–1.4 MHz), eliminating frequency modulation artifacts and enabling predictable EMI filtering - ideal for RF-sensitive circuits. However, light-load efficiency drops to ~75% due to continuous switching. When SYNC is grounded, the device enters PFM mode, reducing quiescent current to 20 µA and boosting light-load efficiency above 85%, but introduces variable-frequency noise. TPS62112MRSAREP supports dynamic switching between modes during operation for adaptive power management.

What thermal management practices are recommended for the TPS62112MRSAREP in high-temperature environments?

For reliable operation at 125°C ambient, the TPS62112MRSAREP requires the exposed thermal pad to be soldered to a minimum 200 mm² copper pour connected to AGND/PGND with ≥6 thermal vias (0.3 mm diameter, filled). The RSA package's 40 K/W θ_JA assumes this layout; omitting vias increases junction temperature by >25°C at 1.5 A. Derating is mandatory: maximum output current drops to 1.0 A at 100°C ambient and 0.6 A at 125°C. Thermal shutdown activates at 145°C junction, but sustained operation above 125°C ambient requires active cooling or reduced load. TPS62112MRSAREP's qualification includes 1000-cycle temperature cycling from –55°C to 125°C.

Does the TPS62112MRSAREP support power sequencing with other ICs in a system?

Yes, the TPS62112MRSAREP supports controlled power sequencing via its EN and PG pins. EN accepts standard CMOS logic levels (VIH = 1.3 V, VIL = 0.3 V) for precise turn-on timing, while PG provides an open-drain signal that asserts high only after V_OUT reaches 4.92 V (98.4% of 5 V) with <200 µs delay on falling edge. This allows cascaded enablement of downstream FPGAs or ADCs. No external RC networks are needed - PG is internally debounced. For reverse sequencing, tie PG to EN of subsequent rails. TPS62112MRSAREP's guaranteed startup time of 1 ms (with 22 µF C_OUT, 800 mA load) ensures deterministic timing windows.