Texas Instruments LM25085AMYX/NOPB

Mfr. Part

LM25085AMYX/NOPB

Manufacturer

Luminary Micro/Texas Instruments

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Detailed Description

Wide-input non-synchronous buck (step-down) DC-DC switching controller. Drives an external transistor/MOSFET. One output. Adjustable switching frequency up to 1 MHz. 4.5–42 V supply range. 100% maximum duty cycle for low-dropout operation. Compact 8-HVSSOP (MSOP/PowerTSSOP) surface-mount package. RoHS3 compliant. Supplied in Tape & Reel.

Key Features

Topology: Buck (step-down), positive output

Controller only (uses external power MOSFET and diode)

Output type: Transistor driver

Input supply range: 4.5 V to 42 V

Switching frequency: up to 1 MHz (user settable)

Duty cycle: up to 100% (supports high duty operation)

Control features: current limit, frequency control

Phases: single output

Synchronous rectifier: no (requires external diode)

Clock sync: not supported

Package: 8-HVSSOP / 8-MSOP / 8-PowerTSSOP (3.00 mm body width)

Operating junction temperature: -40°C to +125°C

RoHS: RoHS3 compliant

Mounting: surface mount

Base product number: LM25085

Supplied as Tape & Reel

Key Advantages

Wide input range (4.5–42 V) fits 12 V and 24 V industrial and automotive rails

External MOSFET lets you choose the right FET for your voltage, current, and efficiency targets

100% duty capability helps minimize dropout when Vin is close to Vout

Up to 1 MHz switching enables compact magnetics and smaller solution size

Simple, flexible design with adjustable frequency and current limit for protection

Small 8-pin HVSSOP footprint saves PCB space

Broad operating temp range (-40°C to +125°C TJ) improves reliability in harsh environments

Positive output and straightforward buck topology simplify power architecture

Packaging

Type: Tape & Reel (TR) for automated assembly

Package / Case: 8-HVSSOP, also noted as 8-PowerTSSOP or 8-MSOP (0.118", 3.00 mm width)

Mounting: surface mount (SMT)

Size: compact 8-pin body, approx. 3.00 mm width; standard fine-pitch leads (refer to datasheet for exact dimensions)

Pin configuration: 8 leads typical for buck controllers (gate drive, feedback, sense, RT/frequency set, VCC, GND). Refer to the datasheet for exact pinout and functions.

Thermal characteristics: junction temperature -40°C to +125°C; thermal performance depends on PCB copper area and layout. Use solid ground plane and adequate copper under/around the device to improve heat spreading.

Electrical properties (summary): Vin 4.5–42 V, single output, up to 1 MHz switching, 0–100% duty, non-synchronous, current limit and frequency control, transistor gate driver output

Lifecycle

Status: Active and widely used. Not nearing discontinuation based on current industry availability.

Equivalent and alternative models (review for fit and design goals):

- LM5085 (Texas Instruments): Non-synchronous buck controller, wide input range, similar function and 8-pin format; good alternative for high Vin designs.

- LM5117 (Texas Instruments): Synchronous buck controller for higher efficiency, wide input range; requires dual MOSFETs.

- TPS5430 / TPS5420 (Texas Instruments): Integrated non-synchronous buck regulators (external FET not required); simpler BOM, lower current capability; check input range needs.

- LM3478 (Texas Instruments): Versatile controller (boost/flyback/SEPIC); consider if your topology may differ from buck.

- Controller families from other vendors: ON Semiconductor/Nexperia/Analog Devices offer similar non-synchronous buck controllers; contact us for cross-reference.

If you need pin-compatibility or drop-in replacements, or a closer electrical match, contact our sales team via the Y-IC website for tailored recommendations and the latest lifecycle updates.

Key Application Areas

Automotive 12 V and 24 V systems (infotainment, ADAS support rails, body electronics)

Industrial automation and control, PLCs, sensors, and actuators

Telecom and networking power (PoL conversions from 24–36 V rails)

Battery-powered and portable instruments needing wide input tolerance

Embedded systems and microcontroller/FPGA power rails

General-purpose step-down supplies for instrumentation and test equipment

Datasheet

Y-IC hosts the most authoritative, up-to-date datasheet for this product on our website. We recommend downloading the LM25085AMYX/NOPB datasheet directly from this page for electrical specifications, pin details, typical application circuits, and layout guidelines.

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