Texas Instruments LMR14050QDPRRQ1

Overview

LMR14050QDPRRQ1 from Texas Instruments is an automotive-grade 40V, 5A synchronous step-down DC-DC converter with integrated 90mΩ high-side MOSFET, 40µA quiescent current, adjustable 200kHz–2.5MHz switching frequency, and 10-pin WSON package. It delivers regulated power in battery-fed automotive systems requiring low standby power and wide input voltage range.

For engineers reviewing the LMR14050QDPRRQ1 datasheet, LMR14050QDPRRQ1 pinout, LMR14050QDPRRQ1 application, or LMR14050QDPRRQ1 equivalent, key selection considerations include AEC-Q100 Grade 1 qualification, spread-spectrum EMI reduction, precision enable input for sequencing, thermal shutdown at 170°C, and internal compensation eliminating external loop components.

Technical Context

The LMR14050QDPRRQ1 implements fixed-frequency peak current mode control with sleep-mode operation below ~300mA load to maintain 40µA IQ. Its internal error amplifier regulates output via a 0.75V reference and resistor divider on FB, while slope compensation prevents subharmonic oscillation above 50% duty cycle.

It supports both resistor-programmed (RT/SYNC pin) and external clock synchronization (250kHz–2.3MHz), includes BOOT capacitor recharge circuit enabling up to 97% duty cycle, and integrates cycle-by-cycle current limit, overvoltage protection, and thermal shutdown-no external fault-handling circuitry required.

Key Specifications

Pinout & Package

LMR14050QDPRRQ1 uses a 10-pin WSON package (4mm × 4mm) with exposed thermal pad (Pin 11) for low R_θJC(bot) = 3.1°C/W. The package is RoHS-compliant, moisture-sensitive level 2a, and designed for reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR14050QDPRRQ1, the LMR14030QDPRRQ1 offers identical integration and qualification at lower current, while the TPS54560QDDARQ1 trades IQ and EMI features for wider VIN and through-hole packaging - making LMR14050QDPRRQ1 optimal for space-constrained, low-power automotive modules.

Availability

LMR14050QDPRRQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, ADAS sensor power supplies, telematics control units, and industrial vehicle gateways requiring stable component supply across extended temperature and lifecycle demands.

Supply support for LMR14050QDPRRQ1 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 automotive qualification expertise and broad manufacturing scale.

The LMR14050QDPRRQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, designed specifically for robust, easy-to-use DC-DC regulation in harsh environments - emphasizing low IQ, AEC-Q100 compliance, and minimal external component count.

FAQ

What is the maximum duty cycle supported by the LMR14050QDPRRQ1?

The LMR14050QDPRRQ1 supports up to 97% duty cycle via its integrated BOOT capacitor recharge circuit, enabling operation in dropout conditions such as 36V input to 3.3V output. This is achieved by periodically pulling SW low to refresh BOOT voltage when it drops below 3.2V during extended high-side conduction, ensuring reliable high-VIN/VOUT ratio regulation without external circuitry.

Does the LMR14050QDPRRQ1 require external compensation components?

No, the LMR14050QDPRRQ1 features fully internal loop compensation, eliminating the need for external Type II or Type III compensation networks. This reduces bill-of-materials cost, PCB area, and design validation effort while maintaining stability across all recommended output capacitor types and values - a key differentiator from non-compensated controllers like the TPS54560QDDARQ1.

How does the spread-spectrum feature of the LMR14050QDPRRQ1 reduce EMI?

The LMR14050QDPRRQ1's spread-spectrum mode dithers the switching frequency by ±6% around the center value, distributing radiated energy across a wider bandwidth. This lowers peak emissions by up to 10dB in the 30–1000MHz range, easing compliance with stringent automotive EMC standards like CISPR 25 Class 5 - especially critical in densely packed ECUs near RF antennas or high-speed data links.

What is the purpose of the PGOOD pin on the LMR14050QDPRRQ1?

PGOOD on the LMR14050QDPRRQ1 is an open-drain power-good flag that asserts high when the output voltage is within ±3% of the target (e.g., 3.3V ±99mV). It requires a 10kΩ–100kΩ pull-up to ≤7V and enables safe sequencing of downstream logic - for example, releasing reset to an MCU only after stable 3.3V is confirmed, preventing brown-out faults during startup.

Can the LMR14050QDPRRQ1 operate with input voltage as low as 4V?

Yes, the LMR14050QDPRRQ1 is specified for continuous operation from 4V to 40V input. At 4V VIN, it maintains regulation down to VOUT ≥ 0.8V (e.g., 3.3V with appropriate duty cycle), supporting cold-crank scenarios in 12V automotive systems. Its undervoltage lockout has a rising threshold of 3.7V and hysteresis of 285mV, ensuring clean startup and shutdown behavior.

Is the thermal pad of the LMR14050QDPRRQ1 electrically connected to GND?

Yes, the exposed thermal pad (Pin 11) of the LMR14050QDPRRQ1 is internally connected to GND and must be soldered to a PCB ground plane. This provides the primary thermal conduction path (R_θJC(bot) = 3.1°C/W) and also serves as the signal ground reference for internal circuits - omitting this connection degrades thermal performance by >20°C junction rise and risks instability due to ground bounce.