LTC3784 - 60V PolyPhase Synchronous Boost Controller

Features

  • PolyPhase® Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise
  • Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation
  • Wide VIN Range: 4.5V to 60V (65V Abs Max); Operates Down to 2.3V After Start-Up
  • Output Voltage Up to 60V
  • ±1% 1.200V Reference Voltage
  • RSENSE or Inductor DCR Current Sensing
  • 100% Duty Cycle Capability for Synchronous MOSFET
  • Low Quiescent Current: 28μA
  • Phase-Lockable Frequency (75kHz to 850kHz)
  • Programmable Fixed Frequency (50kHz to 900kHz)
  • Power Good Output Voltage Monitor
  • Low Shutdown Current, IQ < 4μA
  • Internal LDO Powers Gate Drive from VBIAS or EXTVCC
  • Thermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package

Typical Application

LTC3784 Typical Application
LTC3784 Typical Application

Description

The LTC®3784 is a high performance PolyPhase® single output synchronous boost converter controller that drives two N-channel power MOSFET stages out-of-phase. Multiphase operation reduces input and output capacitor requirements and allows the use of smaller inductors than the single-phase equivalent. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, simplifying high power boost applications.

A 4.5V to 60V input supply range encompasses a wide range of system architectures and battery chemistries. When biased from the output of the boost converter or another auxiliary supply, the LTC3784 can operate from an input supply as low as 2.3V after start-up. The operating frequency can be set within a 50kHz to 900kHz range or synchronized to an external clock using the internal PLL. PolyPhase operation allows the LTC3784 to be configured for 2-, 3-, 4-, 6- and 12-phase operation.

The SS pin ramps the output voltage during start-up. The PLLIN/MODE pin selects Burst Mode® operation, pulseskipping mode or forced continuous mode at light loads.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-28, SSOP-28

LTC3784 Package Drawing
LTC3784 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3784EGN#PBF SSOP 28 E $5.37 $3.76 View
LTC3784EGN#TRPBF SSOP 28 E $3.82 View
LTC3784EUFD#PBF QFN 28 E $5.37 $3.76 View
LTC3784EUFD#TRPBF QFN 28 E $3.82 View
LTC3784HGN#PBF SSOP 28 H $6.47 $4.53 View
LTC3784HGN#TRPBF SSOP 28 H $4.59 View
LTC3784HUFD#PBF QFN 28 H $6.47 $4.53 View
LTC3784HUFD#TRPBF QFN 28 H $4.59 View
LTC3784IGN#PBF SSOP 28 I $6.06 $4.24 View
LTC3784IGN#TRPBF SSOP 28 I $4.30 View
LTC3784IUFD#PBF QFN 28 I $6.06 $4.24 View
LTC3784IUFD#TRPBF QFN 28 I $4.30 View
LTC3784MPGN#PBF SSOP 28 MP $17.14 $12.00 View
LTC3784MPGN#TRPBF SSOP 28 MP $12.06 View
LTC3784MPUFD#PBF QFN 28 MP $17.14 $12.00 View
LTC3784MPUFD#TRPBF QFN 28 MP $12.06 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2061A LTC3784IUFD Demo Board | 6V ≤ VIN ≤ 60V; VOUT= 48V @ 3A to 12A. $125.00
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Click here to view our complete list of demo boards

Applications

  • Industrial
  • Automotive
  • Medical
  • Military

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Design Tools

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LTC3784

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