LTC3525

RECOMMENDED FOR NEW DESIGNS

400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect

Part Models: 12
1ku List Price: Starting From $2.15

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Overview

Up to 95% Efficiency
Output Disconnect and Inrush Current Limit
Fixed Output Voltages of 3V, 3.3V or 5V
Delivers 65mA at 3V from a 1V Input
Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input
Delivers 175mA at 5V from a 3V Input
Burst Mode^® Operation: I_Q = 7μA

Only Three External Components
V_IN > V_OUT Operation
<1μA Shutdown Current
Antiringing Control
Short-Circuit and Overtemperature Protection
Very Low Profile of 1mm
Tiny 6-Lead SC70 Package

The LTC3525-3/LTC3525-3.3/LTC3525-5 are high efficiency synchronous step-up DC/DC converters with output disconnect that can start up with an input as low as 0.85V. They offer a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or Li-Ion applications. Only three small external components are required. The LTC3525 is offered in fixed output voltages of 3V, 3.3V or 5V.

The device includes a 0.5Ω N-channel MOSFET switch and a 0.8Ω P-channel synchronous rectifier. Peak switch current ranges from 150mA to 400mA, depending on load, providing enhanced efficiency. Quiescent current is an ultralow 7μA, maximizing battery life in portable applications.

Other features include <1μA shutdown current, antiringing control and thermal shutdown. The LTC3525 is available in a tiny 6-Lead SC70 package.

List of LTC3525 Options
PART NAME	INPUT START-UP VOLTAGE	OUTPUT VOLTAGE	V_OUT STATUS IN SHUTDOWN MODE
LTC3525-3	0.85V	3V	Output Disconnect
LTC3525-3.3	0.85V	3.3V	Output Disconnect
LTC3525-5	0.85V	5V	Output Disconnect
LTC3525D-3.3	0.85V	3.3V	Pass Through Mode
LTC3525L-3	0.7V	3V	Output Disconnect

Applications

MP3 Players
Portable Instruments
Glucose Meters
Digital Cameras

Part Models: 12
1ku List Price: Starting From $2.15

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
LTC3525ESC6-3#TRMPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ESC6-3#TRPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ESC6-3.3#TRMPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ESC6-3.3#TRPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ESC6-5#TRMPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ESC6-5#TRPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ISC6-3#TRMPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ISC6-3#TRPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ISC6-3.3#TRMPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ISC6-3.3#TRPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ISC6-5#TRMPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3525ISC6-5#TRPBF	6-Lead SC70	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3525ESC6-3#TRMPBF	PRODUCTION
LTC3525ESC6-3#TRPBF	PRODUCTION
LTC3525ISC6-3#TRMPBF	PRODUCTION
LTC3525ISC6-3#TRPBF	PRODUCTION
LTC3525ISC6-3.3#TRMPBF	PRODUCTION
LTC3525ISC6-3.3#TRPBF	PRODUCTION
LTC3525ISC6-5#TRMPBF	PRODUCTION
LTC3525ISC6-5#TRPBF	PRODUCTION
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3525ESC6-3.3#TRMPBF	PRODUCTION
LTC3525ESC6-3.3#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice 4

Models for the following parts are available in LTspice:

LTC3525-3
LTC3525-3.3
LTC3525-5

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

LTC3525-3.3 Demo Board | Micropower Synchronous Step-Up, 1V to 3.2VIN, 3.3VOUT @ 140mA

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Product Details

Demonstration circuit 879 is a Micropower Synchronous Step-Up Converter with Output Disconnect featuring the LTC3525-3.3 and LTC3525-5. The LTC3525 is a high performance Burst Mode operation only, synchronous boost converter. The LTC3525 incorporates a feature that maximizes efficiency by adjusting the peak and valley of the inductor current as a function of load. The demo board has two assembly versions: DC879A-A and DC879A-B. The DC879A-A offers fixed 3.3V output. The DC879A-B offers fixed 5V output. They offer a compact, high efficiency solution in single cell or dual cell alkaline or Li-ion applications. Only three small external components are required.