Texas Instruments LMR23625CFPQDRRTQ1

Overview

LMR23625CFPQDRRTQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified 36-V, 2.5-A synchronous step-down DC-DC converter in a 12-pin WSON wettable flank package with power-good (PGOOD) output, fixed 2.1-MHz switching frequency, and FPWM mode support. It delivers regulated 1–28-V output for automotive infotainment clusters, USB charging, and off-battery power conditioning.

For engineers reviewing the LMR23625CFPQDRRTQ1 datasheet, LMR23625CFPQDRRTQ1 pinout, LMR23625CFPQDRRTQ1 application, or LMR23625CFPQDRRTQ1 equivalent, key selection considerations include its 4–36-V input range, 75-µA PFM quiescent current, integrated high- and low-side MOSFETs (160 mΩ/95 mΩ), soft-start into prebiased loads, and synchronization capability up to 2.2 MHz.

Technical Context

The LMR23625CFPQDRRTQ1 employs fixed-frequency peak-current-mode control with internal loop compensation, eliminating external compensation components. Its architecture integrates a precision 1-V reference, adjustable output via FB resistor divider, and dual-mode operation: PFM for ultra-low IQ at light load and FPWM for constant-frequency, low-ripple regulation.

It features a dedicated EN/SYNC pin supporting both precise enable threshold (1.55 V typ) and AC-coupled external clock synchronization (200 kHz–2.2 MHz), plus a PGOOD open-drain flag with 94–96.5% UV and 104–110% OV thresholds - all implemented in a thermally enhanced 3.0 mm × 3.0 mm WSON package with exposed thermal pad.

Key Specifications

Pinout & Package

LMR23625CFPQDRRTQ1 uses a 12-pin WSON (DRR) package with wettable flank leads and exposed thermal pad (3.0 mm × 3.0 mm body). The package supports automated optical inspection (AOI) and enhances thermal performance (R_θJA = 41.5°C/W, R_θJC(bot) = 16.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR23625CFQDDARQ1, the LMR23625CFPQDRRTQ1 adds PGOOD for robust sequencing but requires WSON assembly capability; versus LMR23630CFPQDRRTQ1, it trades 0.5-A headroom for tighter thermal margin and lower gate charge in space-constrained modules.

Availability

LMR23625CFPQDRRTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, USB charging, and off-battery power conditioning requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for LMR23625CFPQDRRTQ1 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for automotive, industrial, and consumer markets.

The LMR23625CFPQDRRTQ1 belongs to TI's SIMPLE SWITCHER® automotive-grade DC-DC converter family, designed specifically for robust, low-EMI, easy-to-design power solutions in safety-critical vehicle subsystems.

FAQ

What is the minimum input voltage required for LMR23625CFPQDRRTQ1 to start switching?

The LMR23625CFPQDRRTQ1 has a rising undervoltage lockout (UVLO) threshold of 3.7 V (typical), with hysteresis of 0.4 V. It begins switching when VIN exceeds this threshold and remains operational down to 3.3 V before shutting down. This allows reliable startup during automotive cold-crank events where battery voltage may dip to ~6 V, but the device itself requires ≥3.7 V to initiate regulation. The LMR23625CFPQDRRTQ1 is not intended to operate below 4 V per recommended conditions.

Does LMR23625CFPQDRRTQ1 support output voltages below 1 V?

No, the LMR23625CFPQDRRTQ1 does not support output voltages below 1 V. Its internal reference voltage is fixed at 1.0 V (±2%), and the FB pin is designed to regulate based on a resistor divider referenced to that 1-V基准. The datasheet specifies a minimum output voltage of 1 V, and attempting to set VOUT lower than 1 V violates the reference architecture and results in inaccurate or unstable regulation. For sub-1-V applications, a different regulator with a lower reference or external reference injection would be required.

How is thermal performance affected by the exposed thermal pad on LMR23625CFPQDRRTQ1?

LMR23625CFPQDRRTQ1's exposed thermal pad (PAD pin 13) is electrically connected to AGND and serves as the primary heat dissipation path. When soldered to a ≥100-mm² copper pour tied to internal ground planes, it reduces junction-to-board thermal resistance (R_θJB) to 16.5°C/W - 40% lower than the HSOIC variant. This directly lowers steady-state junction temperature by up to 25°C at 2.5-A load, enabling full-rated current in compact layouts without forced air. Omitting pad soldering degrades R_θJB by >3× and risks thermal shutdown.

Can LMR23625CFPQDRRTQ1 synchronize to a 1-MHz external clock?

Yes, LMR23625CFPQDRRTQ1 supports synchronization to a 1-MHz external clock via its EN/SYNC pin. The device accepts SYNC frequencies from 200 kHz to 2.2 MHz, and 1 MHz falls well within that range. To implement synchronization, AC-couple the clock signal using a 1-nF capacitor, ensure peak-to-peak amplitude exceeds 2.8 V, and maintain ON/OFF times >100 ns. The LMR23625CFPQDRRTQ1 will lock to the external edge and maintain phase alignment - critical for EMI reduction in multi-rail automotive systems.

What is the purpose of the NC pin (Pin 11) on LMR23625CFPQDRRTQ1?

Pin 11 on LMR23625CFPQDRRTQ1 is designated NC (No Connect) and is not internally bonded to any die function. It must be left electrically floating - neither connected to ground, power, nor routed on the PCB. No solder mask opening or thermal relief is required. This pin exists solely for mechanical symmetry and package compatibility within TI's WSON-12 footprint family; populating or connecting it risks unintended coupling or assembly defects. All functional signals are assigned to Pins 1–10 and 12–13.