LTC3525D-3.3

RECOMMENDED FOR NEW DESIGNS

400mA Micropower Synchronous Step-Up DC/DC Converter with Pass Through Mode

Part Models: 4
1ku List Price: Starting From $2.19

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Part Details

V_OUT Connected to V_IN in Shutdown
Up to 95% Efficiency
0.85V Minimum Input Start-Up Voltage
Fixed Output Voltage of 3.3V
Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input
Burst Mode^® Operation: I_Q = 7μA
V_IN Range: 0.5V to 4.5V
Only Three External Components
V_IN > V_OUT Operation
Anti-Ringing Control
Short-Circuit and Overtemperature Protection
Very Low Profile of 1mm
Tiny 6-Lead SC70 Package

The LTC3525D-3.3 is a high efficiency synchronous stepup DC/DC converter that can start up with an input as low as 0.85V. It offers 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 LTC3525D features a fixed output voltage of 3.3V. In shutdown, V_OUT is connected to V_IN through the inductor.

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 anti-ringing control and thermal shutdown. The LTC3525D is available in a tiny 6-Lead SC70 package.

List of LTC3525 Options


PART NAME	INPUT START-UP VOLTAGE	OUTPUT VOLTAGE	VOUT 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: 4
1ku List Price: Starting From $2.19

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
LTC3525DESC6-3.3#TRMPBF	6-Lead SC70	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3525DESC6-3.3#TRPBF	6-Lead SC70	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3525DISC6-3.3#TRMPBF	6-Lead SC70	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3525DISC6-3.3#TRPBF	6-Lead SC70	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Tools & Simulations

LTspice

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.

Resources

DC879A - Demo Manual
240.00K

DC879A - Design File
680.00K

DC879A - Schematic
56.00K

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Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1