Overview
Features and Benefits
- 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
Product Details
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.
| Power Good | |
| LTC3785 | No |
| LTC3785-1 | Yes |
Applications
- Palmtop Computers
- Handheld Instruments
- Wireless Modems
- Cellular Telephones
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
-
R533 Reliability Data3/26/2018PDF17 K
-
DC957A - Demo Manual9/24/2009PDF1M
Tools & Simulations
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
LTC3785
LTC3785-1
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3785EUF#PBF | Material Declaration | Reliability Data | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| LTC3785EUF#TRPBF | Material Declaration | Reliability Data | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| LTC3785IUF#PBF | Material Declaration | Reliability Data | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| LTC3785IUF#TRPBF | Material Declaration | Reliability Data | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R533 Reliability Data |
PCN-PDN Information
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Support & Discussions
LTC3785 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.