Texas Instruments LM5160QPWPRQ1

Overview

LM5160QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified 65-V input, 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 automotive power supplies and IGBT gate drive biasing.

For engineers reviewing the LM5160QPWPRQ1 datasheet, LM5160QPWPRQ1 pinout, LM5160QPWPRQ1 application, or LM5160QPWPRQ1 equivalent, key selection criteria include its 4.5–65 V input range, 14-pin HTSSOP package with thermal pad, programmable switching frequency up to 1 MHz, prebiased start-up capability, and inherent peak current limiting with thermal shutdown.

Technical Context

The LM5160QPWPRQ1 implements adaptive constant on-time (COT) control with inverse VIN dependence, enabling stable regulation across wide input ranges without external loop compensation. Its internal error amplifier maintains ±1% output voltage accuracy over –40°C to 125°C, while the FPWM pin selects forced PWM (CCM) for multi-output Fly-Buck™ operation or DCM for light-load efficiency.

It integrates 65-V N-channel high-side and low-side switches (R_DS(ON) = 0.29 Ω / 0.13 Ω), a 7.5-V VCC bias regulator (30-mA current-limited), and dual UVLO circuits - one at EN/UVLO (1.24 V threshold) and another at VCC (3.98 V threshold) - ensuring robust startup and fault protection in harsh automotive environments.

Key Specifications

Pinout & Package

LM5160QPWPRQ1 is housed in a 14-pin HTSSOP package (4.40 mm × 5.00 mm, 0.65-mm pitch) with exposed thermal pad connected to AGND for enhanced thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5161QPWPRQ1, the LM5160QPWPRQ1 trades 35-V headroom for lower cost and smaller footprint in 65-V-max applications; versus LM5017MRX/NOPB, it delivers full integration and Fly-Buck™ capability but lacks ultra-high-voltage flexibility.

Availability

LM5160QPWPRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, IGBT gate drive bias supplies, and low-power isolated DC/DC converters requiring stable component supply across production lifecycles.

Supply support for LM5160QPWPRQ1 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 designing analog ICs, embedded processors, and system solutions for automotive, industrial, and communications markets.

The LM5160QPWPRQ1 belongs to TI's automotive-qualified DC/DC converter product line, engineered specifically for high-input-voltage, space-constrained power conversion in safety-critical vehicle subsystems.

FAQ

What is the maximum input voltage rating for the LM5160QPWPRQ1?

The LM5160QPWPRQ1 has an absolute maximum input voltage rating of 70 V, with recommended operation from 4.5 V to 65 V. This 65-V upper limit ensures reliable performance under ISO 7637-2 load dump conditions common in automotive 24-V systems. Exceeding 65 V continuously may trigger internal protection or reduce lifetime reliability, though brief transients up to 70 V are tolerated per datasheet specifications.

Does the LM5160QPWPRQ1 support isolated Fly-Buck™ operation?

Yes, the LM5160QPWPRQ1 supports Fly-Buck™ topology through its FPWM pin: connecting FPWM to VCC forces continuous conduction mode (CCM), enabling stable multi-output operation with a coupled inductor. This configuration maintains fixed duty cycle and predictable secondary output regulation - a key requirement for isolated gate drive or auxiliary bias supplies in automotive and industrial inverters.

What package type and thermal characteristics does the LM5160QPWPRQ1 use?

The LM5160QPWPRQ1 uses a 14-pin HTSSOP package (PWP) with 0.65-mm pitch and an exposed thermal pad. Its junction-to-ambient thermal resistance (R_θJA) is 39.3°C/W, and junction-to-board (R_θJB) is 19.6°C/W. The thermal pad must be soldered to a dedicated AGND copper area on the PCB to achieve rated 2-A output current and prevent thermal shutdown under sustained load.

How is the switching frequency programmed on the LM5160QPWPRQ1?

The LM5160QPWPRQ1 switching frequency is set by a resistor (RON) connected between VIN and pin 5 (RON). On-time varies inversely with VIN, yielding nearly constant frequency - e.g., RON = 100 kΩ yields ~500 kHz at VIN = 24 V. Equation 4 in the datasheet calculates RON for target frequency, with minimum on-time constraints requiring RON ≥ 100 kΩ for 65-V inputs to maintain >150 ns on-time.

Can the LM5160QPWPRQ1 start up into a precharged output capacitor?

Yes, the LM5160QPWPRQ1 supports prebiased start-up: when enabled, it detects existing output voltage and ramps the FB node to match, preventing reverse current flow through the low-side FET. This avoids damaging inrush into charged capacitors - critical for systems with hold-up capacitors or hot-swap architectures. No external circuitry is needed; the feature is inherent to the control architecture.