Texas Instruments LM27341SDX/NOPB

Overview

LM27341SDX/NOPB from Texas Instruments is a monolithic 2-MHz, 1.5-A synchronous step-down DC-DC regulator in a 3 mm × 3 mm 10-pin WSON package. It features a 150-mΩ internal NMOS switch, 1% feedback reference accuracy, 70-nA shutdown current, and frequency synchronization capability (1–2.35 MHz), enabling compact, high-efficiency local power conversion for embedded systems with 3 V to 20 V input and 1 V to 18 V output.

For engineers reviewing the LM27341SDX/NOPB datasheet, LM27341SDX/NOPB pinout, LM27341SDX/NOPB application, or LM27341SDX/NOPB equivalent, key selection criteria include its 1.5-A load capability, 2-MHz fixed switching frequency, peak current-mode control architecture, thermal shutdown at 165°C, and compatibility with small external inductors (e.g., 1.0 µH) and ceramic capacitors in space-constrained designs.

Technical Context

The LM27341SDX/NOPB implements peak current-mode PWM control with internal compensation and a fixed 2-MHz oscillator that supports external synchronization via the SYNC pin (1–2.35 MHz). Its bootstrap gate drive circuitry generates VBOOST – VSW up to ~5.5 V using an internal LDO and external C_BOOST, enabling efficient operation of the integrated 150-mΩ NMOS switch.

It employs cycle-by-cycle current limiting (2 A min), frequency foldback during overcurrent (down to 220 kHz), output overvoltage protection (1.13 × V_FB), and undervoltage lockout (2.75 V typ.) with 470 mV hysteresis. Soft-start is fixed at 1 ms, and thermal shutdown activates at 165°C with 15°C hysteresis.

Key Specifications

Pinout & Package

LM27341SDX/NOPB uses a 3 mm × 3 mm, 10-pin WSON (DSC) package with exposed thermal pad (DAP) tied to GND. The package supports high power density and efficient heat dissipation when soldered to a multi-layer PCB with thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM27342SDX/NOPB, the LM27341SDX/NOPB trades 0.5-A output capacity for identical size, sync capability, and lower BOM cost; versus TPS62130ARGTR, it provides critical frequency synchronization in a smaller 10-pin WSON package but at reduced current rating.

Availability

LM27341SDX/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, radio power supplies, HDD core power, and local 12-V to Vcore converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LM27341SDX/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, embedded processing, and power management ICs, with leadership in high-reliability power conversion solutions.

The LM2734x product line was designed for space-constrained, high-frequency DC-DC conversion in automotive infotainment, industrial HMIs, and portable electronics where board area, thermal performance, and EMI control are critical.

FAQ

What is the maximum output current supported by the LM27341SDX/NOPB?

The LM27341SDX/NOPB delivers up to 1.5 A of continuous output current under recommended operating conditions (T_J ≤ 125°C, proper PCB thermal design). Its current limit is specified at 2 A minimum across temperature, ensuring robust overload protection without derating in typical ambient environments.

Does the LM27341SDX/NOPB require external compensation components?

No, the LM27341SDX/NOPB uses internal compensation optimized for peak current-mode control. This eliminates the need for external Type-II or Type-III compensation networks, simplifying design and reducing bill-of-materials count while maintaining stability across 1–18 V output ranges.

Can the LM27341SDX/NOPB operate with a 5-V input and 1.2-V output?

Yes, the LM27341SDX/NOPB supports this configuration: its 65-ns minimum on-time and 2-MHz switching frequency enable stable 1.2-V output from 5-V input (duty cycle ≈ 24%). Use a 1.0 µH inductor and ensure C_BOOST is properly sized per TI SNVS497F Section 7.3.2 for low-input-voltage bootstrapping.

What is the purpose of the DAP thermal pad on the LM27341SDX/NOPB package?

The DAP (exposed thermal pad) on the LM27341SDX/NOPB serves as both a low-impedance ground connection and primary thermal path. When soldered to a PCB ground plane with ≥4 thermal vias, it achieves R_θJB = 22.5°C/W, significantly improving power handling and reliability during 1.5-A continuous operation.

How does frequency synchronization work on the LM27341SDX/NOPB?

The LM27341SDX/NOPB accepts an external clock (1–2.35 MHz) on the SYNC pin to override its internal 2-MHz oscillator. Upon first rising edge, switching locks to the external frequency; loss of SYNC causes automatic reversion to 2 MHz within 1.5 µs. Grounding SYNC selects internal operation - no pull-up or pull-down resistors required.