Features and Benefits
- 3.6V to 20V Input Voltage Range
- Wide Output Voltage Range of 0.6V to 97% VIN Optimized for 0.6V to 6V
- Low RDS(ON) Integrated Switches Provide Up to 95% Efficiency
- Up to 2.5A of Output Current
- Average Input and Output Current Monitoring
- Programmable Average Input/Output Current Limit
- Die Temperature Monitor and Programmable Limit
- Adjustable Switching Frequency: 500kHz to 3MHz
- External Frequency Synchronization
- Current Mode Operation for Excellent Line and Load Transient Response
- 0.6V Reference with 1% Accuracy Over Temperature
- User Selectable Burst Mode® or Forced Continuous Operation
- Short-Circuit Protected
- Output Voltage Tracking Capability
- Power Good Status Output
- Available in Small, Thermally Enhanced, 20-Lead (3mm × 4mm) QFN Package
The LTC3626 is a high efficiency, monolithic synchronous buck regulator using a phase-lockable controlled on-time, current mode architecture capable of supplying up to 2.5A of output current. The operating supply voltage range is 3.6V to 20V, making it suitable for a wide range of power supply applications.
The operating frequency is programmable from 500kHz to 3MHz with an external resistor allowing the use of small surface mount inductors. For applications sensitive to switching noise, the LTC3626 can be externally synchronized over the same frequency range. An internal phase-locked loop aligns the on-time of the top power MOSFET to the internal or external clock. This unique controlled on-time architecture is ideal for high step-down ratio applications that demand high switching frequencies and fast transient response. An internal phase lock loop servos the on-time of the internal one-shot timer to match the frequency of the internal clock or an applied external clock.
The LTC3626 offers two operational modes: Burst Mode and forced continuous mode to allow the user to optimize output voltage ripple, noise and light load efficiency for a given application.
- Distributed Power Systems
- Battery-Powered Instruments
- Point-of-Load Power Supply
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Demonstration circuit 1768A is a step-down converter, using the LTC3626 monolithic synchronous buck regulator, which has current and temperature monitoring capabilities. The 1768A has an input voltage range of 3.6V to 20V, and is capable of delivering up to 2.5A of output current. The output voltage range of the 1768A is 6V down to 0.6V.
Documentation & Resources
R539 Reliability Data3/26/2018
DC1768A - Demo Manual3/14/2013
LTC3626 - 20V, 2.5A SWITCHER+3/4/2013
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:
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.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
Design tools for the following parts are available in LTpowerCAD:
LTC3626 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|
|LTC3626EUDC#PBF||Material Declaration||Reliability Data||20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)|
|LTC3626EUDC#TRPBF||Material Declaration||Reliability Data||20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)|
|LTC3626IUDC#PBF||Material Declaration||Reliability Data||20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)|
|LTC3626IUDC#TRPBF||Material Declaration||Reliability Data||20-Lead QFN (3mm x 4mm x 0.75mm w/ EP)|
|Wafer Fabrication Data||R539 Reliability Data|
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.
Selecting the Sample button above 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.
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.