Texas Instruments LM5160DNTR

Overview

LM5160DNTR from Texas Instruments is a 65-V, 2-A synchronous buck/Fly-Buck™ DC/DC converter with integrated high-side and low-side N-channel MOSFETs, adaptive constant on-time control, ±1% feedback reference, and FPWM-selectable CCM/DCM operation. It delivers regulated output in industrial PLCs, IGBT gate drive bias supplies, and telecom isolated bias rails.

For engineers reviewing the LM5160DNTR datasheet, LM5160DNTR pinout, LM5160DNTR application, or LM5160DNTR equivalent, key selection considerations include its 4.5–65 V input range, programmable on-time via RON, thermal shutdown with hysteresis, external VCC bias capability (LM5160A variant), and Fly-Buck™-enabled multi-output isolation support.

Technical Context

The LM5160DNTR implements adaptive constant on-time (COT) control where switch on-time varies inversely with VIN to maintain nearly constant switching frequency-adjustable up to 1 MHz via RON resistor. Its internal error amplifier provides ±1% VREF accuracy over –40°C to 125°C, enabling stable regulation without external loop compensation.

Peak current limiting uses VIN- and VFB-dependent forced off-time for short-circuit protection with minimal foldback. The EN/UVLO circuit offers independently adjustable input undervoltage threshold (1.24 V typ) and hysteresis, while VCC UVLO (4.1 V) and BST UVLO (3.6 V) protect gate drive integrity under brownout conditions.

Key Specifications

Pinout & Package

LM5160DNTR is housed in a 12-pin WSON package (4.0 mm × 4.0 mm) with exposed thermal pad (EP) connected to AGND for enhanced thermal performance (RθJA = 33.4°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck/Fly-Buck™ applications.

Compared with LM5160DNTR, LM5161DRCT extends input range but adds loop compensation complexity, while TPS54260DGQR offers higher current but forfeits Fly-Buck™ capability and programmable CCM-making LM5160DNTR uniquely suited for isolated dual-output bias generation in compact industrial systems.

Availability

LM5160DNTR is available at Aetrix Electronics and suitable for industrial programmable logic controllers, IGBT gate drive bias supplies, and telecom primary-side bias rails requiring stable component supply across long production lifecycles.

Supply support for LM5160DNTR 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 ICs, with decades of expertise in high-reliability industrial and automotive power solutions.

The LM5160 product line was designed specifically for wide-input, isolated and non-isolated DC/DC conversion in harsh environments-targeting 24 V/48 V industrial automation, energy metering, and telecom infrastructure where efficiency, integration, and robust protection are critical.

FAQ

What is the difference between LM5160DNTR and LM5160A?

The LM5160DNTR is the standard version of the LM5160 family in 12-pin WSON packaging. The LM5160A variant adds external VCC bias capability-allowing an external 9–13 V supply to be connected to the VCC pin to reduce power dissipation at high input voltages. LM5160DNTR does not support external VCC bias and relies solely on its internal start-up regulator. Both share identical pinout, RON programming, FPWM functionality, and Fly-Buck™ topology support.

Can LM5160DNTR be used in Fly-Buck™ topology?

Yes, LM5160DNTR supports Fly-Buck™ operation when configured in forced continuous conduction mode (CCM) by connecting the FPWM pin to VCC. This enables use of a coupled inductor to generate isolated secondary outputs without optocouplers or secondary controllers. The device's adaptive COT control and integrated high-/low-side FETs simplify implementation, and typical designs achieve >80% efficiency for 5 V/1 A isolated outputs from 24 V input.

What is the minimum recommended RON resistor value for LM5160DNTR?

The minimum recommended RON resistor value for LM5160DNTR is 100 kΩ, which sets the maximum on-time and supports up to ~500 kHz switching at VIN = 24 V. Using RON < 100 kΩ risks exceeding the minimum off-time limit (170 ns), potentially causing instability or erratic switching. For 1 MHz operation at higher VIN (e.g., 48 V), RON = 100 kΩ remains valid per datasheet Figure 8, but layout parasitics must be minimized to preserve timing accuracy.

Does LM5160DNTR support prebiased start-up?

Yes, LM5160DNTR supports prebiased start-up, allowing it to safely power up into an already charged output capacitor without forcing reverse current through the internal synchronous rectifier. This feature is enabled by internal circuitry that disables the low-side FET during initial soft-start ramp, preventing shoot-through and ensuring monotonic VOUT rise-even when powering downstream regulators with stored charge.

How is thermal performance managed in the LM5160DNTR WSON package?

LM5160DNTR uses a thermally enhanced 12-pin WSON package with an exposed thermal pad (EP) that must be soldered to a dedicated AGND copper pour. With proper PCB layout-including ≥4 thermal vias under EP connected to inner ground planes-LM5160DNTR achieves RθJA = 33.4°C/W and supports 2 A continuous output at ambient temperatures up to 85°C. Junction temperature is monitored internally and triggers thermal shutdown at 175°C with 20°C hysteresis for safe recovery.