Features and Benefits
- 2.5V to 36V Input Voltage Range
- Programmable Switching Frequency from 500kHz to 2.1MHz
- Synchronizable Up to 2.75MHz
- VOUT(MIN): 0.8V
- Independent Soft-Start for Each Converter
- Separate VIN Supplies for Each Converter
- Duty Cycle Range: 0% to 90% at 1MHz
- Available in 24-Lead (4mm × 4mm) QFN and 20-Lead TSSOP Packages
The LT3570 is a buck and boost converter with internal power switches and LDO controller. Each converter is designed with a 1.5A current limit and an input range from 2.5V to 36V, making the LT3570 ideal for a wide variety of applications. Switching frequencies up to 2.1MHz are programmed with an external timing resistor and the oscillator can be synchronized to an external clock up to 2.75MHz.
The LT3570 features a programmable soft-start function that limits the feedback voltage during start-up helping prevent overshoot and limiting inrush current. The LDO controller is capable of delivering up to 10mA of base current to an external NPN transistor.
- Cable and Satellite Set-Top Boxes
- Automotive Systems
- Telecom Systems
- “Dying Gasp” Systems
- TFT LCD Displays
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)
Demonstration circuit 1106 is a 1.5A Buck Converter, 1.5A Boost Converter, and LDO Controller featuring the LT3570. The Buck is designed to convert a 4V to 36V source to 3.3V at 1A. The LDO is powered from the output of the buck and converts 3.3V to 2.5V at 100mA. The boost converts a 3.3V to 10V source to 12V at 275mA.
Documentation & Resources
R530 Reliability Data3/26/2018
DC1106A - Demo Manual9/24/2009
Buck, Boost and LDO Regulators Combined in a 4mm × 4mm QFN6/1/2008 LT Journal
Tools & Simulations
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:
LT3570 Companion Parts
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|
|LT3570EFE#PBF||Material Declaration||Reliability Data||20-Lead TSSOP w/ EP|
|LT3570EFE#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP w/ EP|
|LT3570EUF#PBF||Material Declaration||Reliability Data||24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)|
|LT3570EUF#TRPBF||Material Declaration||Reliability Data||24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)|
|LT3570IFE#PBF||Material Declaration||Reliability Data||20-Lead TSSOP w/ EP|
|LT3570IFE#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP w/ EP|
|LT3570IUF#PBF||Material Declaration||Reliability Data||24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)|
|LT3570IUF#TRPBF||Material Declaration||Reliability Data||24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)|
|Wafer Fabrication Data||R530 Reliability Data|
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Sample & Buy
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
(*)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.
Please see the latest communication from our CCO regarding lead times.
A Sample link will be shown above, next to the part, only for parts that are included in our sample program. Selecting the Sample button will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.