Texas Instruments LMR10530XSDX/NOPB

Overview

LMR10530XSDX/NOPB from Texas Instruments is a monolithic 1.5-MHz, 3-A synchronous step-down DC/DC regulator in a 10-pin WSON (3 mm × 3 mm) package, featuring an internal 56-mΩ PMOS switch, 0.6-V feedback reference, and peak current-mode control. It delivers regulated output voltages from 0.6 V to 4.5 V across 3 V–5.5 V input rails, optimized for point-of-load conversion in space-constrained industrial and embedded systems.

For engineers reviewing the LMR10530XSDX/NOPB datasheet, LMR10530XSDX/NOPB pinout, LMR10530XSDX/NOPB application, or LMR10530XSDX/NOPB equivalent, key selection considerations include its fixed 1.5-MHz switching frequency, 300-nA shutdown quiescent current, internal soft-start, cycle-by-cycle current limit, and thermal shutdown-critical for compact, high-efficiency power delivery in FPGA, DSP, and microcontroller core supplies.

Technical Context

The LMR10530XSDX/NOPB implements peak current-mode control with internal compensation and a fixed 1.5-MHz oscillator, enabling stable regulation without external loop components. Its 30-ns minimum on-time supports low-duty-cycle operation down to 0.6-V output at 5.5-V input, while the integrated 56-mΩ PMOS switch and dedicated PGND/SGND pins separate power and signal return paths to minimize noise coupling.

Frequency foldback reduces switching frequency to 400 kHz during startup or overload when FB voltage drops below 0.32 V, limiting peak switch current and thermal stress. Output overvoltage protection triggers at 0.69 V (15% above V_FB), and undervoltage lockout engages with 2.7-V turn-on threshold and 350-mV hysteresis to prevent erratic startup.

Key Specifications

Pinout & Package

LMR10530XSDX/NOPB is housed in a thermally enhanced 10-pin WSON package (3.00 mm × 3.00 mm × 0.8 mm) with exposed die attach pad (DAP) for low-θ_JA (53°C/W) and θ_JC (12°C/W). The DAP must be soldered to PCB ground plane for optimal thermal performance but is not a primary current-carrying GND path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR10530YSDX/NOPB, the LMR10530XSDX/NOPB offers wider duty-cycle range for demanding low-VOUT applications and superior fault protection (OVP, foldback), while TPS62130ARGTR trades protection features for marginally higher current and different frequency-making LMR10530XSDX/NOPB the preferred choice for safety-aware, space-constrained designs.

Availability

LMR10530XSDX/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, FPGA core supplies, medical sensors, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LMR10530XSDX/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability DC/DC conversion solutions.

The LMR10530XSDX/NOPB belongs to TI's LMR monolithic buck regulator product line, engineered for high-power-density point-of-load conversion in thermally constrained, space-limited applications such as portable instrumentation and automotive ECUs.

FAQ

What is the switching frequency of the LMR10530XSDX/NOPB?

The LMR10530XSDX/NOPB operates at a fixed 1.5-MHz switching frequency. This high frequency enables the use of small surface-mount inductors (typically ≤1.0 µH) and ceramic output capacitors, minimizing total solution footprint. The frequency is internally set and not user-adjustable; it differs from the 3-MHz LMR10530Y variant.

Does the LMR10530XSDX/NOPB require external compensation components?

No, the LMR10530XSDX/NOPB uses internally compensated peak current-mode control, eliminating the need for external compensation networks. This simplifies design, reduces BOM count, and ensures stable regulation across its full operating range (0.6–4.5 V output, –40°C to +125°C junction temperature) without tuning.

How does the LMR10530XSDX/NOPB protect against overvoltage conditions?

The LMR10530XSDX/NOPB includes built-in output overvoltage protection that monitors the FB pin. If the FB voltage exceeds 0.69 V (15% above the 0.6-V internal reference), the internal PMOS switch is immediately disabled, allowing the output to decay safely. This feature protects downstream loads without requiring external circuitry.

What is the purpose of the separate SGND and PGND pins on the LMR10530XSDX/NOPB?

The LMR10530XSDX/NOPB separates signal ground (SGND) and power ground (PGND) to isolate sensitive analog feedback paths from high-di/dt switch currents. SGND serves as the reference for the FB divider and error amplifier, while PGND carries pulsed inductor return current. Proper PCB layout-routing SGND traces away from PGND planes-minimizes noise-induced regulation error.

Can the LMR10530XSDX/NOPB operate with a 3-V input supply?

Yes, the LMR10530XSDX/NOPB supports input voltages from 3 V to 5.5 V. At 3-V input, it can deliver regulated outputs down to 0.6 V with sufficient headroom (e.g., 3 V → 1.2 V at 3 A), leveraging its 56-mΩ R_DS(ON) and 1.5-MHz switching to maintain >88% efficiency. Undervoltage lockout ensures clean startup above 2.7 V.