LTC3417A-2

PRODUCTION

Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator

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Overview

  • High Efficiency: Up to 95%
  • 1.5A/1A Guaranteed Minimum Output Current
  • Synchronizable to External Clock
  • No Schottky Diodes Required
  • Programmable Frequency Operation: 1.5MHz or Adjustable From 0.6MHz to 4MHz
  • Low Ripple (<35mVP-P) BurstMode® Operation
    IQ: 125μA in Sleep
  • Low RDS(ON) Internal Switches
  • Short-Circuit Protected
  • VIN: 2.25V to 5.5V
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Ultralow Shutdown Current: IQ < 1μA
  • Low Dropout Operation: 100% Duty Cycle
  • Power Good Ouput
  • Phase Pin Selects 2nd Channel Phase Relationship with Respect to 1st Channel
  • Internal Soft-Start with Individual Run Pin Control
  • Available in Small Thermally Enhanced (5mm × 3mm) DFN and 20-Lead TSSOP Packages

The LTC3417A-2 is a dual constant frequency, synchronous step-down DC/DC converter. Intended for medium power applications, it operates from a 2.25V to 5.5V input voltage range and has a constant programmable switching frequency, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Each output voltage is adjustable from 0.8V to 5V. Internal synchronous, low RDS(ON) power switches provide high efficiency without the need for external Schottky diodes.

A user selectable mode input allows the user to trade off ripple voltage for light load efficiency. Burst Mode operation provides high efficiency at light loads, while Pulse Skip mode provides low ripple noise at light loads. A phase mode pin allows the second channel to operate in-phase or 180° out-of-phase with respect to channel 1. Out-of-phase operation produces lower RMS current on VIN and thus lower stress on the input capacitor.

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 100μA. In shutdown, the device draws <1μA.

Features Notes
LTC3417 - -
LTC3417A Improved Channel Matching -
LTC3417A-1 Power On Reset Recommended For New Designs
LTC3417A-2 Power Good Recommended For New Designs

Applications

  • GPS/Navigation Systems
  • Automotive Instrumentation
  • PC Cards
  • Industrial Power Supplies
  • General Purpose Point of Load DC/DC
LTC3417A-2
Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator
VOUT2 Efficiency (Burst Mode Operation) 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
Analog to Digital Converters (ADCs) 1
LTC2991
RECOMMENDED FOR NEW DESIGNS Octal I2C Voltage, Current, and Temperature Monitor
Oscillators 1
LTC6909
PRODUCTION 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Protection Switches & Controllers 1
LTC4365
RECOMMENDED FOR NEW DESIGNS Overvoltage, Undervoltage and Reverse Supply Protection Controller
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3417
  • LTC3417A
  • LTC3417A-1
  • LTC3417A-2

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3417
  • LTC3417A
  • LTC3417A-2
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.

LTpowerCAD

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

eval board
schematic 1
DC1336A

LTC3417AEDHC-2 Demo Board | Dual Synchronous 1.5/1A 1A 4MHz Step-Down DC/DC Regulator

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Product Details

Demonstration circuit DC1336 is a dual output regulator consisting of two constant-frequency step-down converters, based on the LTC3417A-2 monolithic dual synchronous buck regulator. The DC1336 has an input voltage range of 2.25V to 5.5V, with one regulator capable of delivering up to 1.5A of output current and the other regulator capable of delivering up to 1A of output current. The DC1336 can operate in either Burst Mode® or Pulse-Skipping operation. In shutdown, the DC1336 can run off of less than 1 uA total. The DC1336 is a very efficient circuit: up to 94% for either circuit.


 
DC1336A
LTC3417AEDHC-2 Demo Board | Dual Synchronous 1.5/1A 1A 4MHz Step-Down DC/DC Regulator
DC1336A - Schematic

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