LTC7138

RECOMMENDED FOR NEW DESIGNS

High Efficiency, 140V 400mA Step-Down Regulator with PassThru

Data Sheet (Rev. A) Product Selection Table

Part Models: 12
1ku List Price: Starting From $4.55

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Overview

Wide Operating Input Voltage Range: 4V to 140V
Internal Low Resistance Power MOSFET
No Compensation Required
Adjustable 100mA to 400mA 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 LTC7138 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 LTC7138 can supply up to 400mA 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 LTC7138’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 LTC7138 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC7138 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 LTC7138s to be connected in parallel for higher current applications.

The LTC7138 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: 12
1ku List Price: Starting From $4.55

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
LTC7138EMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138EMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138HMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138HMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138HMSE#WPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138HMSE#WTRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138IMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138IMSE#TRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138IMSE#WPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138IMSE#WTRPBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138MPMSE#PBF	16(12)-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7138MPMSE#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
LTC7138EMSE#PBF	PRODUCTION
LTC7138EMSE#TRPBF	PRODUCTION
LTC7138HMSE#PBF	PRODUCTION
LTC7138HMSE#TRPBF	PRODUCTION
LTC7138IMSE#PBF	PRODUCTION
LTC7138IMSE#TRPBF	PRODUCTION
LTC7138MPMSE#PBF	PRODUCTION
LTC7138MPMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LTC7138EMSE#PBF	PRODUCTION
LTC7138EMSE#TRPBF	PRODUCTION
LTC7138HMSE#PBF	PRODUCTION
LTC7138HMSE#TRPBF	PRODUCTION
LTC7138IMSE#PBF	PRODUCTION
LTC7138IMSE#TRPBF	PRODUCTION
LTC7138MPMSE#PBF	PRODUCTION
LTC7138MPMSE#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

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC7138

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

LTC7138EMSE Demo Board | HV µPower Buck, 4V ≤ VIN ≤ 140V, VOUT = 5V/3.3V/1.8V/Adj @ Up to 400mA

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Product Details

Demonstration circuit 2172A is a high input voltage, 400mA step-down regulator featuring the LTC7138. The output of the regulator can be programmed for either 5V, 3.3V or 1.8V with on-board jumpers or is adjustable from 800mV to V_IN using an optional feedback divider. The input voltage range is from 4V to 140V. The LTC7138’s Burst Mode^® operation, low quiescent current and internal top FET switch provide high efficiency over a wide range of loads.