Texas Instruments LMR14020SQDPRRQ1

Overview

LMR14020SQDPRRQ1 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 to 40 V input range, 2 A continuous output current, 40 µA quiescent current in sleep mode, and spread-spectrum EMI reduction - designed for battery regulation in engine control units and ADAS domain controllers.

For engineers reviewing the LMR14020SQDPRRQ1 datasheet, LMR14020SQDPRRQ1 pinout, LMR14020SQDPRRQ1 application, or LMR14020SQDPRRQ1 equivalent, key selection considerations include its WSON-10 package thermal performance (R_θJC(bot) = 3.1 °C/W), 75 ns minimum on-time for high VIN/VOUT ratios, precision enable threshold (1.2 V typ), PGOOD open-drain flag, and RT/SYNC dual-mode frequency control (200 kHz–2.5 MHz resistor-programmed or 250 kHz–2.3 MHz synchronized).

Technical Context

The LMR14020SQDPRRQ1 implements fixed-frequency peak current mode control with internal loop compensation, eliminating external compensation networks. Its sleep-mode operation reduces switching losses at light load while maintaining 40 µA I_Q, and the integrated BOOT charge circuit enables up to 97% duty cycle for low-dropout operation.

Spread-spectrum dithering (±6%) is enabled via factory configuration for this variant, reducing conducted EMI peaks without altering average frequency. The device uses a precision 0.75 V feedback reference with ±1.2% total output voltage accuracy over –40°C to 125°C ambient, and features cycle-by-cycle current limiting, thermal shutdown (170°C), and output overvoltage protection.

Key Specifications

Pinout & Package

LMR14020SQDPRRQ1 is housed in a 10-pin WSON package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad (Pin 11) for low-junction-to-board thermal resistance (R_θJB = 13.6 °C/W). The package is RoHS-compliant and moisture-sensitive level 2a.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR14020SQDPRRQ1, the LMR14030SQDPRRQ1 offers higher current headroom in identical footprint, while the TPS54240QDGQRQ1 trades integration and EMI performance for lower unit cost and legacy SOIC compatibility - neither matches the combined low-I_Q, spread-spectrum, and WSON thermal advantages of the original.

Availability

LMR14020SQDPRRQ1 is available at Aetrix Electronics and suitable for automotive battery regulation, ADAS camera power supplies, and telematics always-on rails requiring stable component supply across extended product lifecycles.

Supply support for LMR14020SQDPRRQ1 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 delivering analog and embedded processing solutions, with deep expertise in power management ICs for automotive, industrial, and communications markets.

The LMR14020SQDPRRQ1 belongs to TI's SIMPLE SWITCHER® automotive-grade DC/DC converter family, engineered specifically for high-reliability, low-EMI, and ultra-low-quiescent-current power conversion in harsh automotive environments.

FAQ

What is the maximum output current capability of the LMR14020SQDPRRQ1?

The LMR14020SQDPRRQ1 delivers up to 2 A continuous output current under recommended operating conditions (T_A ≤ 125°C, proper PCB thermal design). Peak current limit is specified at 2.13 A (min) to 4.6 A (max) depending on temperature and input voltage, with cycle-by-cycle protection preventing damage during overload or short-circuit events.

Does the LMR14020SQDPRRQ1 support synchronization to an external clock source?

Yes, the LMR14020SQDPRRQ1 supports external clock synchronization via the RT/SYNC pin, accepting square-wave inputs from 250 kHz to 2.3 MHz. When the pin voltage exceeds the PLL upper threshold (~1.7 V), the internal oscillator disables and the device locks to the external clock's falling edge - enabling precise timing alignment across multiple converters in complex automotive systems.

How does the spread-spectrum feature function in the LMR14020SQDPRRQ1?

The LMR14020SQDPRRQ1 variant includes factory-enabled spread-spectrum modulation that dithers the switching frequency by ±6% around the center value. This reduces peak radiated and conducted EMI amplitudes without changing average frequency or regulation performance - helping designs meet stringent CISPR 25 Class 5 automotive EMC requirements.

What is the purpose of the PGOOD pin on the LMR14020SQDPRRQ1?

The PGOOD pin on the LMR14020SQDPRRQ1 is an open-drain output that asserts logic-low when the output voltage falls outside ±3% of the target (e.g., 4.85 V–5.15 V for 5 V output). It enables safe power sequencing in multi-rail systems and provides fault indication to host microcontrollers - requiring only a 10 kΩ–100 kΩ pull-up resistor to a compatible logic rail ≤7 V.

Can the LMR14020SQDPRRQ1 operate with input voltages below 5 V?

Yes, the LMR14020SQDPRRQ1 supports input voltages as low as 4 V, making it suitable for automotive cold-crank scenarios where battery voltage dips transiently. Its 97% maximum duty cycle and bootstrap refresh circuit maintain regulation even at VIN–VOUT differentials below 1 V, provided the BOOT capacitor (0.1 µF) is correctly placed and rated.

What thermal design guidance applies to the LMR14020SQDPRRQ1 in WSON-10 package?

The LMR14020SQDPRRQ1's WSON-10 package relies on its exposed thermal pad (Pin 11) for heat dissipation. TI specifies R_θJC(bot) = 3.1 °C/W - requiring direct soldering of the pad to ≥4 cm² of inner-layer or bottom-side copper pour connected via ≥6 thermal vias (0.3 mm diameter) to internal ground planes. This achieves junction temperatures within spec at full 2 A load in still air.