LTC3708

PRODUCTION

LTC3708

Fast 2-Phase, No R_SENSE Buck Controller with Output Tracking

PRODUCTION

High Efﬁ ciency Dual Output Step-Down Converter slide

High Efﬁ ciency Dual Output Step-Down Converter

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Part Models 2

1ku List Price Starting From $6.35

Features

Very Low Duty Factor Operation (t_ON(MIN) < 85ns)
No R_SENSE^™ Option for Maximum Efficiency
Very Fast Transient Response
Programmable Output Voltage Up/Down Tracking
2-Phase Operation Reduces Input Capacitance
0.6V ±1% Output Voltage Reference
External Frequency Synchronization
Monotonic Soft-Start
On-board High Current MOSFET Drivers
Wide V_IN Range: Up to 36V
Adjustable Cycle-by-Cycle Current Limit
Instant Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Power Good Output with 100µs Masking
Available in 5mm × 5mm QFN Package

Additional Details

The LTC3708 is a dual, 2-phase synchronous step-down switching regulator with output voltage up/down tracking capability. The IC allows either coincident or ratiometric tracking. Multiple LTC3708s can be daisy-chained in applications requiring more than two voltages to be tracked. Power supply sequencing is accomplished using an external soft-start timing capacitor.

The LTC3708 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock.

Fault protection is provided by an output overvoltage comparator and an optional short-circuit shutdown timer. The regulator current limit level is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to 0.6V output.

Applications

Notebook and Palmtop Computers, PDAs
Digital Signal Processors
Network Servers

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

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FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $6.35

Technical Documents 6

LTC3708: Fast 2-Phase, No R_SENSE Buck Controller with Output Tracking Data Sheet 10/05/2016

R419 Reliability Data 03/22/2018

Design Solutions 41 - Dual Output DC/DC Converter Solutions for Xilinx FPGA Based Systems 08/21/2007

Design Solutions 43 - High Performance Switch Mode Power Solutions for Altera Low Voltage FPGAs 08/21/2007

Design Note 334: 2-Phase DC/DC Controller Makes Fast, Efficient and Compact Power Supplies 04/01/2004

2-Phase Controller Makes Small, Fast and Efficient Power Supplies with Output Tracking 02/01/2004

Design Resources 2

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
LTC3708EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3708EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3708EUH#PBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3708EUH#TRPBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

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Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3708EUH#PBF

PRODUCTION

LTC3708EUH#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Filter by Model

Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3708EUH#PBF

PRODUCTION

LTC3708EUH#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Companion Parts 3

Parts	Product Life Cycle	Description
Dual-Supply Monitors1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Alternative Parts 1

Parts	Product Life Cycle	Description
LTC3838	RECOMMENDED FOR NEW DESIGNS	Dual, Fast, Accurate Step- Down DC/DC Controller with Differential Output Sensing

LTspice 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.