LTC3407-3

PRODUCTION

Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator

Part Models: 2
1ku List Price: Starting From $3.54

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Part Details

Very Low Quiescent Current: Only 40µA
1.8V at 800mA/3.3V at 800mA
High Efficiency: Up to 95%
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
V_IN: 3.3V to 5.5V
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
Power-On Reset Output
Externally Synchronizable Oscillator
Small Thermally Enhanced 3mm × 3mm DFN Package

The LTC3407-3 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 3.3V 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 ≤1.0mm. 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.


	Iout	Fsw	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	Reduced 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: 2
1ku List Price: Starting From $3.54

Documentation

Data Sheet 1

LTC3407-3: Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator Data Sheet 08/07/2009

Reliability Data 1

R415 Reliability Data 03/23/2018

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-3#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3407EDD-3#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Tools & Simulations

LTspice 1

LTC3407-3 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

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

LTpowerCAD 1

LTC3407-3 Project - Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator

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.

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