LTC3458

RECOMMENDED FOR NEW DESIGNS

1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

Part Models: 2
1ku List Price: Starting From $4.40

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Part Details

High Efficiency: Up to 93%
Inrush Current Limiting and Output Disconnect
Programmable Output Voltages up to 7.5V
1.5V to 6V Input Range
Programmable/Synchronizable Fixed Frequency Operation up to 1.5MHz
Programmable Automatic Burst Mode^® Operation
Current Mode Control with Programmable Soft-Start Period and Peak Current Limit
700mA at 7V from 5V Input
0.3Ω N-Channel and 0.4Ω P-Channel 1.4A Switches at 5V_OUT
Ultralow Quiescent Currents: 15µA Sleep, <1µA in Shutdown
3mm × 4mm Thermally Enhanced DFN Package

The LTC3458 is a high efficiency, current mode, fixed frequency, step up DC/DC converter with true output disconnect and inrush current limiting. The LTC3458 is rated for a 7.5V output and includes a 0.3Ω N-channel MOSFET switch and a 0.4Ω P-channel MOSFET synchronous rectifier. The LTC3458 is well suited for battery powered applications and includes programmable output voltage, switching frequency and loop compensation. The oscillator frequency can be set up to 1.5MHz or synchronized to an external clock.

Quiescent current is only 15µA during Burst Mode operation maximizing battery life in portable applications. The Burst Mode current threshold, peak current limit, and softstart are externally programmable. Other features include <1µA shutdown current, antiringing control, and thermal limit. The LTC3458 is available in a low profile (0.75mm), 3mm × 4mm 12-pin DFN package.


	Vout Range	Switch Current
LTC3458	2.0V to 7.5V	1.4A
LTC3458L	2.0V to 6.0V	1.7A

Applications

Point-of-Load Regulators
USB V_BUS Power
LCD Bias
OLED Displays

Part Models: 2
1ku List Price: Starting From $4.40

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
LTC3458EDE#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3458EDE#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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
Silicon Oscillators 2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3458
LTC3458L

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

LTC3458EDE Demo Board | 2V ≤ VIN ≤ 6V, VOUT = 7V @ 200mA ‐ 800mA

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Product Details

Demonstration circuit 728 is a 1MHz Synchronous Step- Up DC/DC Converter featuring the LTC^®3458EDE. The demo circuit demonstrates a DC/DC boost converter, with a 1.5A switch, providing 7V at 200mA to 800mA depending on input voltage, which ranges from 2V to 6V.

The circuit demonstrates the advantages of output disconnect and inrush current limiting.

Resources

DC728A - Schematic
9/24/2009

DC728A - Demo Manual
9/24/2009

DC728A - Design File
9/24/2009

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