LTC3638

RECOMMENDED FOR NEW DESIGNS

High Efficiency, 140V 250mA Step-Down Regulator

Part Models: 8
1ku List Price: Starting From $4.37

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Overview

Wide Operating Input Voltage Range: 4V to 140V
Internal Low Resistance Power MOSFET
No Compensation Required
Adjustable 20mA to 250mA Maximum Output Current
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 12μA
Wide Output Range: 0.8V to V_IN
0.8V ±1% Feedback Voltage Reference
Precise RUN Pin Threshold
Internal or External Soft-Start
Programmable 1.8V, 3.3V, 5V or Adjustable Output
Few External Components Required
Programmable Input Overvoltage Lockout
Thermally Enhanced High Voltage MSOP Package

The LTC3638 is a high efficiency step-down DC/DC regulator with internal power switch that draws only 12μA typical DC supply current while maintaining a regulated output voltage at no load.

The LTC3638 can supply up to 250mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reducing output ripple and component size. The LTC3638’s combination of Burst Mode^® operation, integrated power switch, low quiescent current, and programmable peak current limit provides high efficiency over a broad range of load currents.

With its wide input range of 4V to 140V and programmable overvoltage lockout, the LTC3638 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC3638 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment. A feedback comparator output enables multiple LTC3638s to be connected in parallel for higher current applications.

The LTC3638 is available in a thermally enhanced high voltage-capable 16-lead MSE package with four missing pins.

Applications

Industrial Control Supplies
Medical Devices
Distributed Power Systems
Portable Instruments
Battery-Operated Devices
Avionics
Automotive

Part Models: 8
1ku List Price: Starting From $4.37

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3638EMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3638EMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3638HMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3638HMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3638IMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3638IMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3638MPMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3638MPMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3638EMSE#PBF	PRODUCTION
LTC3638EMSE#TRPBF	PRODUCTION
LTC3638HMSE#PBF	PRODUCTION
LTC3638HMSE#TRPBF	PRODUCTION
LTC3638IMSE#PBF	PRODUCTION
LTC3638IMSE#TRPBF	PRODUCTION
LTC3638MPMSE#PBF	PRODUCTION
LTC3638MPMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0129 Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0129_Form Material_Report
LTC3638EMSE#PBF	PRODUCTION
LTC3638EMSE#TRPBF	PRODUCTION
LTC3638HMSE#PBF	PRODUCTION
LTC3638HMSE#TRPBF	PRODUCTION
LTC3638IMSE#PBF	PRODUCTION
LTC3638IMSE#TRPBF	PRODUCTION
LTC3638MPMSE#PBF	PRODUCTION
LTC3638MPMSE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 1
LTC4366	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper

Parts	Product Life Cycle	Description
LTC3639	RECOMMENDED FOR NEW DESIGNS	High Efficiency, 150V 100mA Synchronous Step-Down Regulator

Tools & Simulations

LTspice 1

LTC3638 Demo Circuit - Automotive Buck Regulator (4-140V to 3.3V @ 250mA)

Models for the following parts are available in LTspice:

LTC3638

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC3638 Demo Board | 4V ≤ VIN ≤ 140V, VOUT = 1.8V/3.3V/5V/Adjustable @ 250mA

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Product Details

Demonstration circuit 2057A is a high input voltage, 250mA output DC/DC power supply featuring the LTC3638. The IC operates with high efficiency Burst Mode^® operation and includes an internal high side power MOSFET. The board will accept an input voltage between 4V and 140V, and provide jumper selected output voltages of 1.8V, 3.3V, 5V with an option for additional voltages. The IC includes internal soft-start and a provision for increasing soft-start time.

Resources

DC2057A - Demo Manual
2/14/2014

DC2057A - Design Files
2/14/2014

DC2057A - Schematic
2/14/2014

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