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LTC3785 - 10V, High Efficiency, Synchronous, No RSENSE Buck-Boost Controller

Features

  • Click Here For LTC3785 Evaluation Kits
  • Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • 2.7V to 10V Input and Output Range
  • Up to 96% Efficiency
  • Up to 10A of Output Current
  • All N-channel MOSFETs, No RSENSE™
  • True Output Disconnect During Shutdown
  • Programmable Current Limit and Soft-Start
  • Optional Short-Circuit Shutdown Timer
  • Output Overvoltage and Undervoltage Protection
  • Programmable Frequency: 100kHz to 1MHz
  • Selectable Burst Mode® Operation
  • Available in 24-Lead (4mm × 4mm) Exposed Pad QFN Package

Typical Application

LTC3785
LTC3785
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Description

The LTC3785 is a high power synchronous buck-boost controller that drives all N-channel power MOSFETs from input voltages above, below and equal to the output voltage. With an input range of 2.7V to 10V, the LTC3785 is well suited for a wide variety of single or dual cell Li-Ion or multicell alkaline/NiMH applications.

The operating frequency can be programmed from 100kHz to 1MHz. The soft-start time and current limit are also programmable. The soft-start capacitor doubles as the fault timer which can program the IC to latch off or recycle after a determined off time. Burst Mode operation is user controlled and can be enabled by driving the MODE pin high.

Protection features include foldback current limit, shortcircuit and overvoltage protection.

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Packaging

QFN-24

LTC3785
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3785EUF#PBF QFN 24 E $5.09 $3.56 View
LTC3785EUF#TRPBF QFN 24 E   $3.62 View
LTC3785EUF-1#PBF QFN 24 E $5.36 $3.75 View
LTC3785EUF-1#TRPBF QFN 24 E   $3.81 View
LTC3785IUF#PBF QFN 24 I $5.54 $3.88 View
LTC3785IUF#TRPBF QFN 24 I   $3.94 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.

Evaluation Kits

Part Number Description Price
DC957A LTC3785EUF | 10V, High Effieciency Synch, No Rsense Buck-Boost Controller $150.00
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Applications

  • Palmtop Computers
  • Handheld Instruments
  • Wireless Modems
  • Cellular Telephones
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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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S-8460 XC9303