1. Products
  2. Amplifiers
  3. Specialty Amplifiers
  4. Current Sense Amplifiers
  5. LT1620


Overview

Features and Benefits

  • Accurate Output Current Programming
  • Usable in Charging Applications Up to 32V Output
  • Programmable Load Current Monitor for End-of-Charging-Cycle Notification (16-Pin Version)
  • Dual Function IC (LT1621) Allows Convenient Integration of Load and Input Current Sensing
  • Level-Shifted Current Sense Output for Current Mode PWM Controllers
  • Can be Used for NiCd, NiMH, Lead-Acid and Lithium-Ion Battery Charging
  • Greater than 96% Efficiency Possible in Charger Applications
  • High Output Currents Possible: > 10A Easily Obtained

Product Details

The LT1620 simplifies the design of high performance, controlled current battery charging circuits when used in conjunction with a current mode PWM controller IC.

The LT1620 regulates average output current independent of input and output voltage variations. Output current can be easily adjusted via a programming voltage applied to the LT1620’s PROG pin.

Most current mode PWM controllers have limited output voltage range because of common mode limitations on the current sense inputs. The LT1620 overcomes this restriction by providing a level-shifted current sense signal, allowing a 0V to 32V output voltage range.

The 16-pin version of the LT1620 contains a programmable low charging current flag output. This output flag can be used to signal when a Li-Ion battery charging cycle is nearing completion.

The LT1621 incorporates two fully independent current control circuits for dual loop applications.

Applications

  • High Current Battery Chargers
  • High Output Voltage DC/DC Converters
  • Constant Current Sources
  • Overcurrent Fault Protectors

Product Lifecycle icon-recommended 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.

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.

LTspice

Models for the following parts are available in LTspice:

LT1620
LT1620S8

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
LT1620CGN#PBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
LT1620CGN#TRPBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
LT1620CMS8#PBF Material Declaration Reliability Data 8-Lead MSOP
LT1620CMS8#TRPBF Material Declaration Reliability Data 8-Lead MSOP
LT1620CS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LT1620CS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LT1620IGN#PBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
LT1620IGN#TRPBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
LT1620IS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LT1620IS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
Wafer Fabrication Data R371 Reliability Data

PCN-PDN Information

Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

Sample & Buy


Ordering FAQs


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.

 

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


Please see the latest communication from our CCO regarding lead times.

 

Sampling


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.


Price Table Help