LTC3407A

PRODUCTION

Dual Synchronous 600mA, 1.5MHz Step-Down DC/DC Regulator

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Overview

  • High Efficiency: Up to 96%
  • Low Ripple (35mVP-P) Burst Mode Operation; IQ = 40μA
  • 1.5MHz Constant Frequency Operation
  • No Schottky Diodes Required
  • Low RDS(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: IQ < 1µA
  • Output Voltages from 5V down to 0.6V
  • Power-On Reset Output
  • Externally Synchronizable Oscillator
  • Optional External Soft-Start
  • Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages

The LTC3407A is a dual, constant frequency, synchronous step-down DC/DC converter. Intended for low power applications, it operates from a 2.5V to 5.5V input voltage range and has a constant 1.5MHz switching frequency, enabling the use of tiny, low cost capacitors and inductors 1mm or less in height. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 1A 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 ripple noise for low power efficiency. Burst Mode® operation provides the highest efficiency at light loads, while Pulse Skip Mode provides the lowest ripple noise 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.

b    
LTC3407 2x 600mA 1.5MHz
LTC3407-2 2x 800mA 2.25MHz
LTC3407-3 2x 800mA 2.5MHz 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
  • Wireless and DSL Modems
LTC3407A
Dual Synchronous 600mA, 1.5MHz Step-Down DC/DC Regulator
1mm High 2.5V/1.8V at 600mA Step-Down Regulators LTC3407A Efficiency/Power Loss Curve Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Oscillators 1
LTC6908
Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LTC4365
RECOMMENDED FOR NEW DESIGNS Overvoltage, Undervoltage and Reverse Supply Protection Controller
Supervisory Circuits & Reset ICs 1
LTC2935
PRODUCTION Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

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

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

  • LTC3407
  • LTC3407-2
  • LTC3407-3
  • LTC3407-4
LTspice

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

eval board
schematic 1
DC1180A

LTC3407AEDD Demo Board | (DFN) 2.5 ≤ VIN ≤ 5.5V, VOUT1 = 1.2V/1.5V/1.8V @ 0.6A, VOUT2 = 2.5V/3.3V @ 0.6A

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Product Details

Demonstration circuit DC1180 is a dual output regulator consisting of two identical constant frequency step-down converters, based on the LTC3407A monolithic dual synchronous buck regulator in the 3 × 3 DFN-10 package. The LTC3407A is similar to the LTC3407 but has a lower ripple Burst Mode operation and includes an optional external soft-start. The DC1180 has an input voltage range of 2.5V to 5.5V, and either output is capable of delivering up to 600mA of output current. In Burst Mode® operation, the DC supply current is typically only 25 µA (per channel) at no load, and less than 1 µA in shutdown. The DC1180 is a very efficient circuit: up to 96% for either circuit.
DC1180A
LTC3407AEDD Demo Board | (DFN) 2.5 ≤ VIN ≤ 5.5V, VOUT1 = 1.2V/1.5V/1.8V @ 0.6A, VOUT2 = 2.5V/3.3V @ 0.6A
DC1180A - Schematic

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