Texas Instruments 551600142-002/NOPB

Overview

LM3150-002/NOPB from Texas Instruments is a wide-input synchronous buck controller IC designed for high-efficiency DC-DC conversion in industrial and telecom power supplies. It operates from 6 V to 42 V input, delivers adjustable output down to 0.6 V, supports up to 1 MHz switching frequency, and employs constant-on-time (COT) control with emulated ripple mode (ERM) for fast transient response in telecom base station power modules.

For engineers reviewing the LM3150-002/NOPB datasheet, LM3150-002/NOPB pinout, LM3150-002/NOPB application, or LM3150-002/NOPB equivalent, key selection criteria include its valley current limit architecture, RON-based on-time programming, bootstrap gate drive capability, and compatibility with low-ESR ceramic output capacitors in space-constrained 12 A POL designs.

Technical Context

The LM3150-002/NOPB implements a proprietary emulated ripple mode (ERM) variant of constant-on-time (COT) control, enabling stable regulation without loop compensation while supporting ultra-low-ESR ceramic output capacitors. Its on-time is programmable via external RON resistor and automatically scaled inversely with VIN to maintain near-constant frequency across input range.

Fault protection includes valley current limiting via ILIM pin with temperature-compensated 85 µA sense current, overvoltage shutdown at 0.72 V FB threshold, thermal shutdown at 165°C, and pre-biased soft-start recovery - all integrated without requiring external supervision circuitry.

Key Specifications

Pinout & Package

LM3150-002/NOPB is housed in a thermally enhanced HTSSOP-14 (PWP) package measuring 5.00 mm × 4.40 mm with exposed pad for improved heat dissipation and SGND connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5116PWPR and TPS54560RGTT, the LM3150-002/NOPB uniquely balances wide input range, external MOSFET flexibility, and COT-based transient performance in a 14-pin HTSSOP package - making it optimal for cost-sensitive, high-density 12 A POL applications where design reuse and WEBENCH integration matter.

Availability

LM3150-002/NOPB is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and networking equipment requiring stable component supply with long-term lifecycle support and consistent parametric performance.

Supply support for LM3150-002/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 broad industrial and automotive portfolio coverage.

The LM3150 product line delivers easy-to-use synchronous buck controllers targeting high-efficiency, low-external-component-count DC-DC solutions for 6–42 V input systems in telecom, networking, and industrial power applications.

FAQ

What is the recommended input capacitor for LM3150-002/NOPB in a 48 V input, 3.3 V/12 A application?

The LM3150-002/NOPB datasheet specifies that the input capacitor must have voltage rating ≥ VIN(max) and low ESR to handle peak input current. For 48 V input, a 63 V-rated 47 µF X7R ceramic or 100 µF low-ESR polymer capacitor is recommended. Layout best practice requires placing CIN within 5 mm of VIN and PGND pins to minimize high-frequency loop inductance and prevent EN oscillation.

Does LM3150-002/NOPB support diode emulation mode during light-load operation?

Yes, the LM3150-002/NOPB enters diode emulation mode at light loads: LG turns off when inductor current reaches zero, preventing reverse current flow and improving efficiency. This behavior is automatic and does not require external control signals. The mode activates during soft-start and persists below ~15% load, verified in Figure 13 of the LM3150-002/NOPB datasheet.

How is the switching frequency calculated for LM3150-002/NOPB when using RON = 100 kΩ and VIN = 24 V?

Using the LM3150-002/NOPB formula f_S ≈ V_OUT/(K × R_ON) with K = 100 pC, a 100 kΩ RON yields ~417 kHz at 1 V output. At VIN = 24 V and VOUT = 3.3 V, actual frequency is ~500 kHz due to on-time scaling (t_ON ∝ R_ON/VIN). Measured data in Figure 7 confirms 480–520 kHz across temperature for this configuration.

Can LM3150-002/NOPB safely start into a pre-biased output voltage?

Yes, the LM3150-002/NOPB supports pre-bias startup via diode emulation mode during soft-start. When VOUT is already present, the controller ramps FB voltage from 0 V to 0.6 V while keeping LG off until inductor current goes negative - preventing reverse current. This is confirmed in Section 8.3.6 and Figure 13 of the LM3150-002/NOPB datasheet.

What is the minimum recommended BST capacitor value for LM3150-002/NOPB at 1 MHz operation?

The LM3150-002/NOPB datasheet specifies 0.33 µF to 0.47 µF for BST capacitor. At 1 MHz, 0.47 µF is preferred to ensure sufficient charge reservoir for HG driver during short on-times; lower values risk BST undervoltage and HG dropout. Use X7R dielectric with ≤2 mm trace length between BST and SW pins to minimize AC impedance.