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Lithium Ion Battery Charger Circuits
Battery Charges      Alkaline       Lead Acid       
Lithium     
Nickel

Last Updated on: Thursday, December 07, 2017 02:04 PM
 

Circuits Designed by Dave Johnson, P.E. :

 
  • 8-Solar Cell Lithium Ion Battery Charger Version 2 -  Jim Wilber looked at my design for a battery charger and sent me some suggested changes. He suggested using the LTC4412 ideal diode IC to switch off the current path from the solar cell to the battery in darkness. He also noted that the 2. 5v regulator from Seiko I had selected was no longer in production and suggested using the shunt reference . . . [Circuit by Dave Johnson P.E.,  05/21/13]
  • Battery Amp-hour Capacity Tester -  I bought some lithium ion rechargeable batteries a while back. I was planning on using them to modify some solar powered LED spot lights. What I like about these new batteries is that they are the same size as a standard 1. 5v alkaline AA cell . . . [Circuit by David Johnson P.E.,  02/05/12]
  • Lithium Ion Solar Battery Charger-#2 -  A single lithium ion battery cell needs 4. 2v from a current source to insure it is fully charged.   A solar panel with just enough individual cells wired in series to produce the needed voltage would be more efficient than one with more cells for a given surface area.   If you divide 4. 2 by eight you come up with a figure of 0. 525 volts . . . [Hobby Circuit designed by David A. Johnson P.E.,  05/22/13]
  • Solar Lithium Ion Battery Charger Using LT1129 -  I have been designing a number of solar powered devices lately. Many of them use just a single 3. 6v lithium ion battery. These batteries like to be charged from a fixed 4. 2v source with a charging current limited to about C/8, where C is the milliamp-hour rating of the part . . . [Circuit by David A. Johnson P.E.,  12/30/12] 

  • Solar Powered Lithium Ion Battery Charger -  The circuit below feeds a controlled current and voltage to a 3. 6v lithium ion battery. The current is limited to 300ma and the voltage is limited to 4. 2 volts. The circuit uses a LTC1734 IC from Linear Technology. No diode is needed between the circuit a . . . [Hobby Circuit designed by Dave Johnson P.E.,  05/15/07]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

16hv785: Programmable Lithium & Nickel Battery Charger -  Application Note Published 26-Jan-06. . .  [Microchip]

 

2 Cell Lithium Ion Battery Charger -  This circuit was build to charge a couple series Lithium cells (3. 6 volts each, 1 Amp Hour capacity) installed in a portable transistor radio. The charger operates by supplying a short current pulse through a series resistor and then monitoring the battery voltage to determine if another pulse is required. The current can be adjusted by changing the series resistor or adjusting the input voltage. . .  [Designed by Bill Bowden]

 

2-Cell Solar Panel Li-Ion Battery Charger -  This circuit shows a compact solar-powered battery charger using a LTC3105 as a boost converter and a LTC4071 as Li-Ion shunt charger. A 2-cell 400mW solar panel provides the input power to the LTC3105 to produce over 60mA of charge current in full sunlight. Maximum power point control prevents the solar panel voltage from. . .  [Linear Technology App Note, Jul 1, 2011]

 

8-Solar Cell Lithium Ion Battery Charger Version 2 -  Jim Wilber looked at my design for a battery charger and sent me some suggested changes. He suggested using the LTC4412 ideal diode IC to switch off the current path from the solar cell to the battery in darkness. He also noted that the 2. 5v regulator from Seiko I had selected was no longer in production and suggested using the shunt reference . . . [Circuit by Dave Johnson P.E.,  05/21/13]

 

A Minature Low Dropout Battery Charger for Lithium-Ion Batteries -  DN239 Design Notes (Linear Technology) . . .  [Linear Technology]

 

A Very Low Cost SOT-23 Li-ION Battery Charger Requires Little Area & FeW Components -  DN250 Design Notes (Linear Technology) . . .  [Linear Technology]

 

Add Charging Status to Simple Lithium-Ion Charger -  10/02/08  EDN Design Idea   By adding a few simple components to a single-cell Li-ion charger IC, you can get LEDs that indicate charging and charge completed. . .  [by Peter T Miller, Applied Inspirations, Bethlehem, CT]

 

Advanced Topology USB Battery Charger Optimizes Power Utilization for Faster Charging -  DN336 Design Notes (Linear Technology) . . .  [Linear Technology]

 

AN1012_SMSC-Performance Analysis and Software Optimization on Systems Using the LAN91C111 -  Application NoteTechnology Inc. . . .  [Microchip App Note last updated on 13-Jan-04]

 

AN26 Fast Charging Batteries with Zetex High Current PNP Transistors & Benchmarq Controller ICs -  Zetex Semiconductors Applications Note:   High current, fast switching PNP transistors are capable of replacing large packaged P-Channel MOSFETs, when attention is paid to  base drive requirements. This enables space and performance efficient designs at much reduced cost.  . . . 

 

AN40 Lithium Ion Battery Charging using Bipolar Transistors -  Zetex Semiconductors Applications Note:  This application note explores  different types of charge techniques and associated discrete pass elements, highlighting  dominant discrete parameters and selection criteria for each charging technique. . . . 

 

AN667: Smart Battery Charger with Smbus Interface -  Application Note Published 26-Aug-97. . .  [Microchip]

 

AN947: Power Management in Portable Applications: Charging Lithium-Ion/Lithium-Polymer Batteries -  Application Note Published 22-Jul-04. . .  [Microchip]

 

AN960: New Components & Design Methods Bring Intelligence to Battery Charger Applications -  Application Note Published 19-Nov-04. . .  [Microchip]

 

AN971: USB Port-Powered Li-ION/Li-Polymer Battery Charging -  Application Note Published 31-Jan-05. . .  [Microchip]

 

Battery Amp-hour Capacity Tester -  I bought some lithium ion rechargeable batteries a while back. I was planning on using them to modify some solar powered LED spot lights. What I like about these new batteries is that they are the same size as a standard 1. 5v alkaline AA cell . . . [Circuit by David Johnson P.E.,  02/05/12]

 

Battery Charging Using SMSC USB Transceivers -  AN197_SMSC - Technology Inc. . . .  [Microchip App Note last updated on 22-Sep-13]

 

Battery Circuit Extends Power over Ethernet Poe Peak Current -  DN361 Design Notes (Linear Technology). . .  [Linear Technology]

 

Battery Rejuivnator for Lithium Batteries -  These batteries are Not Rechargable. But you can get Considerable Extra Life in this way. . .  [G.L. Chemelec]

 

Charge Li Ion Batteries from AC Line Voltage -  03/02/98 EDN Design Idea   (File contains many circuits, please scroll to find this one) Li-ion battery chargers must apply constant current when the battery charge is low and constant voltage when the battery charge is high. To avoid battery damage, the tolerance on the applied voltage must be less than 1%. The charger in Figure 1 complies with these requirements. . . .  [by Matt Schindler, Maxim Integrated Products, Sunnyvale, CA]

 

Configuration Guide for LM3647 Reference Design -  Application Note. . .  [National Semiconductor]

 

Dual Smart Battery Charger Simplifies Battery Backup for Servers -  DN342 Design Notes (Linear Technology). . .  [Linear Technology]

 

Eight-Solar Cell Lithium Ion Battery Charger Version 3 -  A single lithium ion battery cell needs 4. 2v from a current source to insure it is fully charged. A solar panel with just enough individual cells wired in series to produce the needed voltage would be more efficient than one with more cells for a given surface area. If you divide 4. 2 by eight you come up with a figure of 0. 525 volts . . . [Circuit by Dave Johnson P.E.,  05/21/13]

 

Inexpensive Circuit Charges Lithium-Ion Cells -  DN188 Design Notes (Linear Technology). . .  [Linear Technology]

 

Intelligent Lithium/Nimh Battery Charger -  this will top-up your motorbike battery in 2-3 hours and switch off. . .  [by P. Townshend - EduTek Ltd]

 

iPOD Charger 1 -  MP3 Player Charger. . . 

 

Li-ion battery charger adapts to different chemistries -  09/02/99 EDN Design Idea   Rechargeable lithium-ion (Li-on) cells require a precise charging voltage for maximum performance. The battery chemistry, of which there are many, determines the optimum charge voltage. Two of the more common charging voltages are 4. 1V50 mV and 4. 2V50 mV per cell. Consider the following situation: You have thousands of three-cell Li-ion battery chargers with an output voltage of 12. 6V1%. However, because of a battery-chemistry change, your chargers now need 12. 3V1%. The 12. 6V output is well-regulated and has current limiting, but the voltage is 300 mV too high, and you cannot easily adjust it. . . .  [by Fran Hoffart, Linear Technology Corp, Milpitas, CA]

 

Li-Ion Battery Charging Requires Accurate Voltage Sensing -  Analog Devices-Analog Dialogue. . .  [by Buxton, Joe]

 

Li-Ion CCD Bias Supply (15V,-8V) -  The LT3472 delivers up to 8V at 50mA and 15V at 20mA from a lithium-ion cell, providing bias for many popular CCD imagers . . .  [Linear Technology App Note, Mar 24, 2010]

 

Li-Ion Charge Termination IC Interfaces with PWM Switchers -  DN242 Design Notes (Linear Technology) . . .  [Linear Technology]

 

Li-ION Charge Termination using the LT1505 -  DN244 Design Notes (Linear Technology) . . .  [Linear Technology]

 

Li-Ion Charger -  Lithium Ion batteries pack a lot of power by weight compared to other types. There are 2 things that need to be handled differently than NiCad on NiMH. . . .  [by Luhan Monat-Mesa Arizona]

 

Li-Ion Charger -  The LP2951 regulator is manufactured by National Semiconductor. The choice of values is from an application note Battery Charging, written by Chester Simpson. Diode D1 can be any diode from the 1N00x series, whichever is. . .  [Izhar Fareed-Circuit Designer]

 

Li-ION Linear Charger Allows Fast Full Current Charging While Limiting PC Board Temperature to 85C -  DN283 Design Notes (Linear Technology) . . .  [Linear Technology]

 

Li-Ion Powered Supply for CCD Imager and Five White Backlight LEDs -  The LT3587 provides a complete biasing solution for CCD (15V AT 50mA, -8V AT 100mA) and LED backlighting from a single Li-Ion cell . . .  [Linear Technology App Note, Mar 24, 2010]

 

Li-Ion to +5V AT 25mA, +16V AT 1mA, 13V AT 1mA TFT LCD Power Supply + 10 White LEDs -  The LTC3524 is an integrated BIAS and white LED power converter solution for small/medium-sized polysilicon thin film transistor (TFT) liquid crystal (LCD) display panels. . .  [Linear Technology App Note, Mar 24, 2010]

 

Li-Ion to Six White LEDs and OLED/LCD Bias -  The LT3498 can provide both the positive bias voltage required for OLED or CCD bias as well as drive multiple white LEDs for display backlighting. . .  [Linear Technology App Note, Mar 24th 2010]

 

Lithium charger -  Schematic only, no circuit description. . .  [Designer's name not given]

 

Lithium Ion Battery Charger -  Lithium Ion batteries pack a lot of power by weight compared to other types. There are 2 things that need to be handled differently than NiCad on NiMH. . . .  [by Luhan Monat-Mesa Arizona]

 

Lithium Ion Battery Charging using Bipolar Transistors -  Zetex Semiconductors Applications Note:  This application note explores the different types of charge techniques and associated discrete pass elements, highlighting the dominant discrete parameters and selection criteria for each charging technique. . . . 

 

Lithium Ion Solar Battery Charger-#2 -  A single lithium ion battery cell needs 4. 2v from a current source to insure it is fully charged.   A solar panel with just enough individual cells wired in series to produce the needed voltage would be more efficient than one with more cells for a given surface area.   If you divide 4. 2 by eight you come up with a figure of 0. 525 volts . . . [Hobby Circuit designed by David A. Johnson P.E.,  05/22/13]

 

Lithium Ion, Lithium Poly Charger Circuit -  The above circuit will charge any 2-cell * Li-Ion battery pack. Maximum current is about 650 milliamps. The circuit is designed for batteries of 900mah or higher. Note this circuit is NOT for Li-Metal batts (i. e. Duralites). Power source can be a 12v Gell cell (Power panel) , or can be powered by a car's cigarette lighter. I use an old 12v DC wall transformer (800ma or more. ) Radio shack sells a 12v/1amp wall DC adapter #273-1776 that will work. Supply does not need to be regulated. In fact my cheap supply outputs 17 volts with no load. . . . 

 

Lithium-Ion Charger, Single cell -  The LP2951 regulator is manufactured by National Semiconductors. The choice of values is from an application note "Battery Charging", written by Chester Simpson. Diode D1 can be any diode from the 1N00x series, whichever is conveniently available. It functions as a blocking diode, to prevent a back flow of current from the battery into the LP2951 when the input voltage is disconnected. . .  [Tony van Roon's circuit]

 

LT1510 High Efficiency Lithium-Ion Battery Charger -  DN111 Design Notes (Linear Technology). . .  [Linear Technology]

 

LT1511 Low Dropout Constant-Current/Constant-Voltage 3a Battery Charger -  DN144 Design Notes (Linear Technology) . . .  [Linear Technology]

 

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Lithium Ion Battery Charger Circuits
Battery Charges      Alkaline       Lead Acid       
Lithium     
Nickel


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