LTC3407-2

PRODUCTION

Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

Data Sheet (Rev. D) Product Selection Table

Part Models: 12
1ku List Price: Starting From $3.89

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Overview

High Efficiency: Up to 95%
Very Low Quiescent Current: Only 40µA
2.25MHz Constant Frequency Operation
High Switch Current: 1.2A on Each Channel
No Schottky Diodes Required
Low R_DS(ON) Internal Switches: 0.35Ω
Current Mode Operation for Excellent Line and Load Transient Response
Short-Circuit Protected

Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I_Q < 1µA
Output Voltages from 5V down to 0.6V
Power-On Reset Output
Externally Synchronizable Oscillator
Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages
AEC-Q100 Qualified for Automotive Applications

The LTC3407-2 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1.2mm. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 1.2A power switches provide high efficiency without the need for external Schottky diodes.

A user selectable mode input is provided to allow the user to trade-off noise ripple for low power efficiency. Burst Mode^® operation provides high efficiency at light loads, while Pulse Skip Mode provides low noise ripple at light loads.

To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40µA. In shutdown, the device draws <1µA.

	I_OUT	F_SW	Features
LTC3407	2x 600mA	1.5MHz
LTC3407-2	2x 800mA	2.25MHz
LTC3407-3	2x 800mA	2.25MHz	Fixed 1.8V/3.3V
LTC3407-4	2x 800mA	2.25MHz	Reduce POR Delay
LTC3407A	2x 600mA	1.5MHz	Low Ripple Burst Mode
LTC3407A-2	2x 800mA	2.25MHz	Low Ripple Burst Mode

Applications

PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Wireless and DSL Modems

Part Models: 12
1ku List Price: Starting From $3.89

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
LTC3407EDD-2#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407EDD-2#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407EMSE-2#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407EMSE-2#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407EMSE-2#WPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407EMSE-2#WTRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407IDD-2#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407IDD-2#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407IMSE-2#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407IMSE-2#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407IMSE-2#WPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3407IMSE-2#WTRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3407EMSE-2#PBF	PRODUCTION
LTC3407EMSE-2#TRPBF	PRODUCTION
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]
		PCN22_0157_Form Material_Report Qualification Results Summary Delta Qualification Matrix Detailed Parts List
LTC3407EMSE-2#PBF	PRODUCTION
LTC3407EMSE-2#TRPBF	PRODUCTION
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3407EMSE-2#PBF	PRODUCTION
LTC3407EMSE-2#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LTC3407EMSE-2#PBF	PRODUCTION
LTC3407EMSE-2#TRPBF	PRODUCTION
LTC3407EMSE-2#WPBF	PRODUCTION
LTC3407EMSE-2#WTRPBF	PRODUCTION
LTC3407IMSE-2#PBF	PRODUCTION
LTC3407IMSE-2#TRPBF	PRODUCTION
LTC3407IMSE-2#WPBF	PRODUCTION
LTC3407IMSE-2#WTRPBF	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
LTC3407A-2	PRODUCTION	Dual Synchronous 800mA, 2.25MHz Step-Down DC/DC Regulator

Tools & Simulations

LTspice 1

LTC3407-2 Demo Circuit - Dual 2.25MHz, 800mA, Synchronous Step-Down Regulator (3.3V to 1.2V @ 600mA & 1.8V @ 600mA)

Models for the following parts are available in LTspice:

LTC3407
LTC3407-2
LTC3407-3
LTC3407-4
LTC3407A
LTC3407A-2

LTpowerCAD 1

LTC3407-2 Project - Ref. Design 2.25MHz

Design tools for the following parts are available in LTpowerCAD:

LTC3407
LTC3407-2
LTC3407-3
LTC3407-4

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.

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

LTC3407-2EDD Demo Board | 2.5V ≤ VIN ≤ 5.5V, VOUT1 = 1.2V/1.5V/1.8V @ 800mA, VOUT2 = 2.5V @ 800mA

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Product Details

Demonstration circuit 734 is a Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator featuring the LTC3407-2. The DC734 has an input voltage range of 2.5V to 5.5V, and both outputs are capable of delivering up to 800mA of output current. V_OUT1 has a jumper-selectable output voltage that can be set to 1.2V, 1.5V or 1.8V. V_OUT2 is fixed at 2.5V.

Resources

DC734A - Demo Manual
9/24/2009

DC734A - Design File
9/24/2009

DC734A - Schematic
9/24/2009

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