Texas Instruments LMR14020QDPRTQ1

Overview

LMR14020QDPRTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade synchronous step-down DC/DC converter with integrated 90 mΩ high-side MOSFET, 4 V–40 V input range, 2 A continuous output current, and ultra-low 40 µA quiescent current-designed for battery-regulated systems in engine control units and ADAS power rails.

For engineers reviewing the LMR14020QDPRTQ1 datasheet, LMR14020QDPRTQ1 pinout, LMR14020QDPRTQ1 application, or LMR14020QDPRTQ1 equivalent, key selection considerations include its 75 ns minimum on-time, spread-spectrum EMI reduction capability, internal loop compensation, precision enable input with adjustable UVLO, and thermal shutdown at 170 °C.

Technical Context

The LMR14020QDPRTQ1 implements fixed-frequency peak current mode control with sleep-mode operation below ~300 mA load to maintain efficiency. It features internal slope compensation to prevent subharmonic oscillation above 50% duty cycle and supports up to 97% effective duty cycle via bootstrap refresh circuitry during low-V_IN–V_OUT dropout conditions.

Switching frequency is programmable from 200 kHz to 2.5 MHz using an external RT resistor or synchronized to an external clock (250 kHz–2.3 MHz) via the RT/SYNC pin. The device includes cycle-by-cycle current limiting, overvoltage protection on V_OUT, and undervoltage lockout on VIN with 285 mV hysteresis.

Key Specifications

Pinout & Package

LMR14020QDPRTQ1 is packaged in a 10-pin WSON (DPR) package (4 mm × 4 mm) with exposed thermal pad for low R_θJC(bot) = 3.1 °C/W, enabling high-power density layout in space-constrained automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR14020QDPRTQ1, LMR14030QDPRTQ1 offers higher current headroom in identical packaging, while TPS54240QDGQRQ1 trades integration for design flexibility-neither is pin-compatible, but both serve overlapping automotive buck applications with distinct implementation trade-offs.

Availability

LMR14020QDPRTQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, ADAS power supplies, and industrial control units requiring stable component supply with AEC-Q100 qualification and long-term production support.

Supply support for LMR14020QDPRTQ1 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 and embedded processing technologies, with decades of automotive-grade product development and manufacturing excellence.

The LMR14020QDPRTQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family-designed specifically for reliable, low-EMI, high-efficiency DC/DC conversion in harsh automotive environments.

FAQ

What is the maximum input voltage rating for the LMR14020QDPRTQ1?

The LMR14020QDPRTQ1 has an absolute maximum input voltage rating of 44 V on the VIN pin, with recommended operation from 4 V to 40 V. This range accommodates automotive battery transients including load dump (up to 40 V) and cold-crank (down to 4 V), making it suitable for direct connection to vehicle battery rails without external protection circuitry in most cases.

Does the LMR14020QDPRTQ1 support fixed 5 V output without external feedback resistors?

Yes, the LMR14020QDPRTQ1 supports fixed 5 V output in specific variants (e.g., LMR14020SSQ5DDARQ1), but the LMR14020QDPRTQ1 itself is the adjustable version. For LMR14020QDPRTQ1, the FB pin must be connected to a resistor divider to set V_OUT; however, TI provides reference designs achieving ±1% 5 V output using standard 1% resistors and the 0.75 V internal reference.

How does the spread-spectrum feature reduce EMI in the LMR14020QDPRTQ1?

The LMR14020QDPRTQ1 implements spread-spectrum modulation by dithering the switching frequency ±6% around the center value. This spreads radiated and conducted noise energy across a wider bandwidth, lowering peak emissions by up to 10 dB-directly aiding compliance with CISPR 25 Class 5 requirements for automotive electronics without adding external filters or shielding.

What is the thermal pad connection requirement for the LMR14020QDPRTQ1 WSON package?

The thermal pad (Pin 11) of the LMR14020QDPRTQ1 WSON package must be soldered to a dedicated PCB copper pour connected to system ground. TI specifies a minimum 4 mm × 4 mm thermal pad with ≥4 thermal vias (0.3 mm diameter, spaced ≤1 mm apart) to an internal ground plane. This achieves R_θJC(bot) = 3.1 °C/W and prevents thermal shutdown under 2 A continuous load at 125 °C ambient.

Can the LMR14020QDPRTQ1 be synchronized to an external clock, and what are the valid frequency and voltage levels?

Yes, the LMR14020QDPRTQ1 supports synchronization via the RT/SYNC pin across 250 kHz to 2.3 MHz. Valid logic levels require V_HIGH ≥ 1.7 V and V_LOW ≤ 0.5 V, with minimum pulse width of 30 ns. The internal PLL locks within 100 µs, and the pin automatically reverts to resistor-programmed mode if the external clock stops-ensuring graceful fallback behavior.