Texas Instruments LMR12015XSDX/NOPB

Overview

LMR12015XSDX/NOPB from Texas Instruments is a monolithic 2-MHz peak-current-mode PWM step-down DC/DC regulator in a 10-pin WSON (3 × 3 mm) package, delivering up to 1.5-A output current with 1-V to 18-V adjustable output voltage, 1% feedback reference accuracy, and 70-nA shutdown current. It powers space-constrained point-of-load rails in industrial and embedded systems requiring fast transient response and high power density.

For engineers reviewing the LMR12015XSDX/NOPB datasheet, LMR12015XSDX/NOPB pinout, LMR12015XSDX/NOPB application, or LMR12015XSDX/NOPB equivalent, key selection considerations include its 3–20-V input range, internal 150-mΩ NMOS switch, frequency synchronization capability (1–2.35 MHz), thermal shutdown at 165°C, and internally compensated architecture enabling minimal external components.

Technical Context

The LMR12015XSDX/NOPB employs peak-current-mode control with an internal 1-V reference and fixed slope compensation, enabling stable regulation across wide load and line variations without external compensation. Its 65-ns minimum on-time supports high duty-cycle operation at low output voltages while maintaining 2-MHz switching.

It integrates dual supply domains-AVIN powers control circuitry and PVIN powers the power stage-with separate ground paths (GND and DAP) for noise isolation and thermal management. The BOOST pin drives the internal NMOS gate via a bootstrap capacitor, requiring careful layout to sustain gate drive under high-duty-cycle conditions.

Key Specifications

Pinout & Package

LMR12015XSDX/NOPB uses a thermally enhanced 10-pin WSON (DSC) package measuring 3.00 mm × 3.00 mm × 0.8 mm, with exposed thermal pad (DAP) tied directly to GND for efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR12020XSDX/NOPB, the LMR12015XSDX/NOPB offers tighter current matching for 1.5-A nominal loads and lower gate drive demand, while TPS62130ARGTR provides higher current and integrated synchronous FETs at the cost of pin compatibility and layout reuse.

Availability

LMR12015XSDX/NOPB is available at Aetrix Electronics and suitable for industrial automation, portable medical instrumentation, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LMR12015XSDX/NOPB 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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer markets.

The LMR120xx product line delivers high-frequency, easy-to-use buck regulators targeting space-constrained point-of-load applications where minimal external components and thermal robustness are essential.

FAQ

What is the maximum recommended input voltage for the LMR12015XSDX/NOPB?

The LMR12015XSDX/NOPB has a recommended operating input voltage range of 3 V to 20 V, with absolute maximum ratings up to 24 V on AVIN and PVIN pins. Exceeding 20 V continuously risks exceeding thermal limits or violating safe operating area margins, especially at high output currents. Always observe the 24-V absolute maximum to prevent permanent damage.

Does the LMR12015XSDX/NOPB require an external bootstrap capacitor?

Yes, the LMR12015XSDX/NOPB requires a 0.1-µF ceramic capacitor between BOOST and SW pins to sustain gate drive for the internal NMOS switch. This capacitor charges during the off-time via the internal LDO and is critical for proper high-side switch operation-omission causes immediate failure to regulate or excessive dropout under load.

Can the LMR12015XSDX/NOPB operate with a 1.2-V output voltage?

Yes, the LMR12015XSDX/NOPB supports output voltages from 1 V to 18 V using an external resistor divider on the FB pin. For a 1.2-V output, set R1 and R2 such that V_OUT = 1 V × (1 + R1/R2); TI recommends using standard 1% resistors with values ≥10 kΩ to minimize bias current error and noise susceptibility.

How does frequency synchronization work on the LMR12015XSDX/NOPB?

The LMR12015XSDX/NOPB accepts an external clock signal (1–2.35 MHz) on the SYNC pin to override its internal 2-MHz oscillator. Upon first rising edge, it locks to the external frequency; if the signal is lost, it reverts to 2 MHz within 1.5 µs. Grounding SYNC selects internal operation-no pull-up or pull-down is required beyond that.

What thermal design guidance applies to the LMR12015XSDX/NOPB's DAP pad?

The DAP pad on the LMR12015XSDX/NOPB must be soldered to a dedicated thermal land connected to ≥4 cm² of 2-oz internal or bottom-layer copper, with ≥4 thermal vias (0.3-mm diameter) to inner/ground planes. Failure to implement this results in θ_JA degrading from 33°C/W to >60°C/W, risking thermal shutdown at ≤1-A load in still air.