ADP2291

Compact, 1.5 A Linear Charger for Single-Cell Li+ Battery
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Product Details

The ADP2291 is a constant-current/constant-voltage linear charger for a single cell lithium ion battery, requiring just a few components to provide a simple and safe charging system that operates from a wide 4.5 V to 12 V input voltage range. It features an internally controlled, multistep charging cycle that improves battery life.

An external, low cost, PNP provides the charging current to the battery and an external resistor sets the maximum charge current. A small external capacitor programs the maximum charge time. The controller includes an LED driver to indicate the battery charging status.

Safety features include charging stop mode for battery faults, output overshoot protection, and thermal shutdown. The ADP2291 also features automatic reverse isolation, which does not require an additional blocking diode.

The multistep charge cycle optimizes the battery charging time in a safe manner. It features a trickle charge mode for a deeply discharged cell and a fast charging mode with a maximum current of 1.5 A. The ADP2291 controls the end of charge with a 4.2 V output voltage that is 1% accurate over line and temp-erature. It automatically recharges the battery if the cell voltage drops. When the input supply is removed, the part enters a low current state and reduces the current drawn from the battery to below 1 µA.

The ADP2291 is available in both a small, 8-pin MSOP package and a 3 × 3 mm LFCSP package that is ideally suited for small, portable applications.

Product Lifecycle

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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.

Design Resources

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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.

ADP2291 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

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Overview

2 Reviews
2 out of 2 (100%) customers recommend this product.
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Most Helpful Review

by katunari
What I like in this product is that you need a minimal amount of components to program charge timer and charging current. Also wide input area comes in handy.

Most Recent Review

by Anonymous
With it's foot of "ADJ",it is very convenient to program it by both voltage and resistance.

All Reviews

by Anonymous, 11 Dec 13
It is a unit of great design.
With it's foot of "ADJ",it is very convenient to program it by both voltage and resistance.
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by katunari, 11 Apr 13
Easy to use
What I like in this product is that you need a minimal amount of components to program charge timer and charging current. Also wide input area comes in handy.
Was this Helpful?Helpful(0)

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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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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