Texas Instruments LM27403SQE/NOPB

Mfr. Part

LM27403SQE/NOPB

Manufacturer

Texas Instruments, formerly Luminary Micro

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Detailed Description

High performance synchronous buck DC DC controller for step-down power supplies

Operates from a 3 to 20 V supply

Drives external N channel MOSFETs through a strong transistor driver output

Programmable switching frequency from 200 kHz to 1.2 MHz

Single phase positive output configuration

Built in control features for enable, frequency control, power good, soft start, and tracking

Supports external clock synchronization

High maximum duty cycle up to 93 percent for low dropout operation

Industrial grade temperature range from minus 40 to 125 degrees Celsius junction

Packaged in compact 24 WQFN 4 by 4 mm with exposed thermal pad

RoHS3 compliant

Key Features

Main category Integrated Circuits ICs

Subcategory PMIC DC DC Switching Controllers

Function step down buck topology

Supply voltage range 3 to 20 V

Switching frequency range 200 kHz to 1.2 MHz adjustable

Number of outputs 1

Output phases 1

Output configuration positive

Synchronous rectifier yes for higher efficiency

Output type transistor driver for external MOSFETs

Control features enable frequency control power good soft start tracking

Clock sync yes for multi rail coordination

Duty cycle max 93 percent

Operating temperature minus 40 to 125 degrees Celsius TJ

Mounting type surface mount

Base product number LM27403

Package case 24 WQFN 4 by 4 mm and 24 WFQFN exposed pad

Supplier device package 24 WQFN 4 by 4

RoHS ROHS3 compliant

Standard packaging tape and reel TR

Key Advantages

High efficiency through synchronous rectification and optimized gate drive for external MOSFETs

Wide input range covers common 5 V and 12 V rails and supports intermediate bus architectures

Broad frequency range lets you trade off size versus EMI to meet strict layout and noise goals

High duty cycle capability supports tight dropout and high ratio conversions

Soft start and tracking make multi rail sequencing simple and safe for FPGAs DSPs and CPUs

Power good gives reliable system level supervision and fault handling

External clock sync enables clean beat frequency management in multi converter systems

Compact 24 WQFN with exposed pad improves thermal performance and saves board space

Industrial temperature rating ensures robust operation in harsh environments

Packaging

Type tape and reel TR for automated pick and place

Package case 24 WQFN 4 by 4 mm and 24 WFQFN with exposed thermal pad

Material molded plastic QFN over copper leadframe lead free and RoHS3 compliant

Size 4 mm by 4 mm body nominal low profile QFN

Pin configuration 24 lead QFN standard TI pinout for LM27403 family

Thermal characteristics exposed pad for efficient heat removal and lower junction temperature when properly soldered to PCB copper

Electrical properties lead free and RoHS3 compliant supports high speed gate drive to external N MOSFETs

Mounting type surface mount SMD

Lifecycle

Status commonly supplied and active for production as of the latest available information

Not known to be nearing discontinuation but lifecycle should be verified for long term programs

Potential alternatives from Texas Instruments depending on input range current and feature needs

- LM3150 synchronous buck controller similar input range and external MOSFET drive

- TPS40322 dual synchronous buck controller if two phases or dual outputs are required

- TPS40170 or TPS40140 family for advanced control features and multi phase options

- LM5116 for higher input voltage rails up to 100 V if wide VIN is needed

Compatibility and pinout differ by device confirm details in datasheets and with our team

If an exact equivalent or drop in substitute is required contact Y-IC sales through our website for a tailored cross reference and availability check

Key Application Areas

Point of load regulators for FPGAs ASICs DSPs CPUs and memory

Server motherboards storage systems and networking equipment

Telecom and datacom infrastructure baseband and line cards

Industrial control automation test and measurement and machine vision

Embedded computing and edge AI platforms needing sequenced rails

Automotive infotainment and ADAS modules where ambient temperatures are moderate

Consumer and prosumer electronics high efficiency power stages

Datasheet

Y-IC hosts the most authoritative and up to date datasheet for LM27403SQE NOPB on our product page

We recommend downloading the datasheet directly from this page for complete specifications application notes and layout guidance

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