Texas Instruments LM5160ADNTR

Overview

LM5160ADNTR from Texas Instruments is a 65-V, 2-A synchronous buck/Fly-Buck™ DC/DC converter with integrated high-side and low-side MOSFETs, adaptive constant on-time control, ±1% feedback reference, and FPWM-selectable CCM/DCM operation - used in isolated IGBT gate drive bias supplies and telecom secondary-side power rails.

For engineers reviewing the LM5160ADNTR datasheet, LM5160ADNTR pinout, LM5160ADNTR application, or LM5160ADNTR equivalent, key selection criteria include input UVLO programmability, external VCC bias capability (LM5160A-specific), BST bootstrap voltage tolerance (up to 84 V), thermal shutdown hysteresis (20°C), and Fly-Buck™ multi-output compatibility via FPWM pin configuration.

Technical Context

The LM5160ADNTR implements adaptive constant on-time (COT) control where switch on-time varies inversely with VIN, enabling stable regulation across 4.5–65 V input without loop compensation. Its internal error amplifier maintains ±1% output voltage accuracy over –40°C to 125°C, while peak/valley current limiting and VCC/BST UVLO protect against overload and gate-drive faults.

FPWM pin logic selects forced PWM (CCM) for multi-output Fly-Buck™ operation or DCM for light-load efficiency; external VCC bias (9–13 V) reduces IC power dissipation at high VIN. The device supports resistor-programmable switching frequency up to 1 MHz and includes prebiased start-up and soft-start via SS pin capacitor.

Key Specifications

Pinout & Package

LM5160ADNTR is housed in a thermally enhanced 12-pin WSON package (4.0 mm × 4.0 mm, 0.5 mm pitch) with exposed thermal pad connected to AGND for PCB-level heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5160ADNTR, LM5161DRCR offers smaller footprint and lower cost but sacrifices 0.5 A output, Fly-Buck™ configurability, and external VCC efficiency gains; LM5017MRX/NOPB extends input range to 100 V yet trades off current capability, package thermal performance, and isolation-ready control features.

Availability

LM5160ADNTR is available at Aetrix Electronics and suitable for industrial programmable logic controllers, IGBT gate drive bias supplies, and telecom primary/secondary side bias rails requiring stable component supply, long-term lifecycle assurance, and production-grade traceability.

Supply support for LM5160ADNTR 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 power conversion ICs.

The LM5160A product line delivers wide-input, synchronous buck/Fly-Buck™ converters optimized for industrial automation, telecom infrastructure, and smart metering - emphasizing integration, thermal robustness, and isolation-ready control architecture.

FAQ

What is the maximum input voltage rating for the LM5160ADNTR?

The LM5160ADNTR has an absolute maximum input voltage rating of 70 V between VIN and AGND, with recommended continuous operation up to 65 V. This enables direct connection to 48 V telecom systems, 60 V industrial buses, and rectified AC inputs without pre-regulation - critical for maintaining efficiency in high-voltage applications where the LM5160ADNTR operates reliably across its full 4.5–65 V range.

How does the FPWM pin affect operation of the LM5160ADNTR?

The FPWM pin on the LM5160ADNTR selects between forced PWM (CCM) and diode-emulation DCM modes: connecting FPWM to VCC enforces continuous conduction for stable multi-output Fly-Buck™ operation, while grounding it enables discontinuous mode for higher light-load efficiency. This dual-mode capability is unique to the LM5160A family and directly enables isolated bias generation without auxiliary windings - a core function of the LM5160ADNTR in telecom and industrial designs.

Can the LM5160ADNTR support external VCC bias, and why does it matter?

Yes, the LM5160ADNTR supports external VCC bias (9–13 V) applied directly to the VCC pin - a feature exclusive to the LM5160A variant. This bypasses the internal high-voltage start-up regulator, reducing power dissipation by up to 40% at VIN = 60 V and improving full-load efficiency by ~2.5 percentage points. For high-input-voltage applications like 48 V telecom or 60 V battery systems, this capability makes the LM5160ADNTR significantly more thermally efficient than standard buck controllers.

What is the purpose of the RON pin on the LM5160ADNTR?

The RON pin on the LM5160ADNTR programs the adaptive on-time duration via a resistor connected to VIN, directly setting the switching frequency and influencing transient response speed. A 100 kΩ resistor yields ~428 ns on-time at 24 V input, targeting ~500 kHz operation - essential for optimizing EMI filter design and inductor size. Because on-time scales inversely with VIN, the RON resistor ensures stable frequency across the full 4.5–65 V input range, a defining characteristic of the LM5160ADNTR's COT architecture.

Does the LM5160ADNTR include built-in protection features, and which ones are confirmed?

Yes, the LM5160ADNTR integrates multiple hardware-based protections: peak current limiting (2.5 A typical high-side threshold), thermal shutdown (175°C with 20°C hysteresis), VCC and BST gate-drive UVLO (4.1 V and 3.6 V thresholds), and programmable input UVLO via EN/UVLO pin. These are not software-configurable but implemented in analog circuitry - ensuring fail-safe behavior during overload, short circuit, or abnormal supply conditions without firmware dependency. All are explicitly verified in the LM5160ADNTR datasheet's Electrical Characteristics tables.