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Li-ion Battery Charger Reference Designs

The primary goal of this text is to assist design engineers in choosing the fitting battery administration and charging IC and finishing their proof of idea (PoC) part. The sources supplied embrace schematics, invoice of fabric (BOM), design recordsdata, GUI interface software program, and so on

The lithium-ion (Li-ion) cell is among the most typical vitality sources in right this moment’s battery-driven world. Li-ion cells have good vitality density and will be recharged. However they’re very unstable and thus require specialised chargers to maintain the battery and gadget secure.

The primary goal of this text is to assist design engineers in choosing the fitting battery administration and charging IC and finishing their proof of idea (PoC) part. The sources supplied embrace schematics, invoice of fabric (BOM), design recordsdata, GUI interface software program, and so on.

All of the reference designs within the article can be utilized as unbiased cell chargers. Among the designs are sufficiently small to be built-in right into a product as a sub-system for charging an in-built battery.

On this article, we’ll talk about the important parameters of every of the Li-ion chargers. Desk 1 lists the vital parameters of all of the charging reference designs.

The TI TIDA-00590 is a quick charger reference design module from Texas Devices. It’s able to quick charging a single Li-ion cell with 5A cost present with low thermal finances. The circuit design has been examined by TI and makes use of the EVM GUI and getting began information.

TIDA 00590 utilises two charging ICs marked as U1 and U2 in a twin IC configuration, which offers greater than their 5A most cost present and distributes the warmth loss throughout the board extra effectively. The charging IC bq25890/2 is a extremely built-in 5A switch-mode battery cost administration and system energy path administration gadget for single-cell Li-ion and Li-polymer batteries.

To realize greater effectivity, the module affords a low impedance energy path, which additionally reduces battery charging time whereas extending the battery life throughout discharging part. The IC additionally integrates enter present optimiser (ICO) and resistance compensation (IRCOMP) to ship most charging energy to the battery.

The module is over 90% environment friendly with a most effectivity of about 94%. The effectivity of the charger decreases because the cost present is elevated.

This gadget helps numerous enter sources, which embrace a normal USB host port, USB charging port, and USB compliant adjustable excessive voltage adaptor. Moreover, it makes use of MaxCharge handshake utilizing D+/D– pins and DSEL pin for USB change management.

The gadget is compliant with USB 2.0 and USB 3.0 energy specs with enter present and voltage regulation. The charger options a number of security options, together with battery temperature adverse thermistor monitoring, charging security timer, overvoltage/overcurrent protections, undervoltage safety, and over-discharge safety.

The charger additionally employs a TS3USB221A, which is a high-bandwidth change that requires a 3.3V provide. Since there are two charging ICs with a single USB I/O for the charger, each the facility administration ICs must work in sync and must switch information concurrently. Subsequently, there’s a necessity for a USB hub or controllers.

The TS3USB221A answer can successfully broaden the restricted USB I/O by switching between a number of USB buses to interface them to a single USB hub or controller. The change works as a multiplexer; it takes a single USB enter and offers output to each the bq25890/2 charging ICs. To supply a 3.3V output to the TS3USB221A, an LDO LP2985AIM5-3.3/NOPB is used.

The module is appropriate to be used in cell phones, cameras, tablets, standalone chargers, and so on. Yow will discover all of the sources for TIDA 00590 by scanning the QR code.

The MCP1630 Li-ion charger is a flexible charger design able to charging as much as two single-cell Li-ion battery packs in a parallel configuration. The facility prepare used for the MCP1630 is a SEPIC. The module can take inputs wherever from 10V to 28V and as much as 16 modules will be daisy-chained for charging extra cells.

The MCP1630 multi-bay Li-ion charger has the flexibleness to optimise the charging algorithm for brand spanking new battery expertise and add proprietary options by coding the microcontroller. The charger affords a number of charging options, reminiscent of enter overvoltage safety, battery overvoltage safety, thermal shutdown, battery-temperature monitoring, and battery-pack fault monitoring. It may additionally detect the standing of the battery together with the insertion and elimination of the battery pack.

The mind of the charger is PIC18F2410. which is an enhanced flash microcontroller with 10-bit A/D. The microcontroller runs at a frequency of 40MHz and offers excessive computational efficiency together with decrease energy consumption.

The reference design additionally has programming header pins required for updating the firmware of the microcontroller. It additionally employs a twin op-amp MCP6292. The battery charger mechanically detects the insertion or elimination of a battery pack.

Vital parts:

U1, U4 – MCP1630 charging IC
U2, U5 – MCP6292 twin op-amp MSOP8
U3, U6 – SN74LVC1G66DBVR bilateral change
U7 – NC7SZ74K8k D-type flip-flop
U8 – PIC18F2410 8-bit CMOS microcontroller
U9 – SN74LVC2G14DBVR twin inverter

Options of MCP1630:

  • Programmable parameters modified in firmware
  • The MCP1630 multi-bay Li-ion charger has the flexibleness to optimise the charging algorithm for brand spanking new battery applied sciences and add proprietary options by coding the microcontroller
  • Managed soft-start

Security options:

  • Overvoltage safety (battery eliminated)
  • Overcharge safety to forestall the battery from turning into dangerously overcharged
  • Overcurrent safety within the occasion of a shorted battery
  • Battery reversal safety
  • Enter short-circuit safety
  • Overtemperature safety to forestall the battery from reaching too excessive a temperature throughout cost
  • Quick cost termination if the battery temperature is exterior a preset window
  • Managed soft-start

The module is appropriate for charging a Li-Ion battery pack. Yow will discover extra particulars and design sources by scanning the QR code.

EV2639A-R-00B 2S cell charger with built-in increase converter

The EV2639A-R-00B from Monolith Energy is the reference design board for the MP2639A, which is a 2-cell battery cost administration system. MP2639A is a extremely built-in, versatile switch-mode cost administration IC that may take enter between 4V and 5.75V and cost 2S Li-ion and Li-Po cells. The module is able to charging 2S cell with 2.5A cost present.

The reference module works in a cost mode and based mostly on the state of the enter it determines the administration of the system and battery charging. The module additionally offers voltage based mostly gasoline gauge indication by way of 4 LED drivers current within the circuit.

The MP2639A IC is very programmable, whose enter voltage and present will be managed by updating the firmware. It offers an possibility of enhancing the discharge present as much as 5A. The board affords a number of security options, which embrace enter overvoltage safety, battery overvoltage safety, thermal shutdown, battery temperature monitoring, and a programmable timer to forestall extended charging of a lifeless battery.

On this reference design, the MP2639A works in a step-up mode to cost the 2-cell battery from the 5V enter. In absence of the charger, the module is in discharge mode, the place it really works in a step-down mode to provide an output of 5V. For the charging perform, the battery charging IC detects the battery voltage and based mostly on the voltage fees the battery in three phases: trickle present, fixed present, and fixed voltage.


  • Bidirectional operation for charging or discharging
  • 2-cell Li-ion or Li-polymer charging
  • Cell stability and safety escorting for two-series cell charging
  • Gentle-load detection for discharge mode
  • Built-in voltage based mostly gasoline gauge utilizing 4 LED drivers
  • Takes 5V enter and fees 2S cell

Security options:

  • Enter overvoltage safety
  • Battery overvoltage safety
  • Thermal shutdown
  • Battery temperature monitoring
  • Programmable timer to forestall extended charging of a lifeless battery

This charger reference design can be utilized in numerous units, together with cell, tablets, energy stations, cell web units, and standalone Li-ion battery chargers. Yow will discover extra particulars and the design sources by scanning the QR code.

ADI DC2703A-A-KIT battery charger with MPPT and telemetry

The DC2703A-A-KIT from Analog Units is a reference design for a Li-ion battery charger with most energy level monitoring (MPPT) and telemetry. It employs IC LT8491 for charging and administration of Li-ion battery and DC1613A, a USB to I2C controller, for enabling communication.

The board is configured for a variety of enter voltages from 17V to 54V and is appropriate for numerous energy sources, which embrace numerous DC sources like photo voltaic panels with 36 to 72 cells with a complete energy of as much as 200W. The module has each buck and increase configurations, thus it may well take enter voltage beneath, above, or equal to the battery voltage. Other than the Li-ion batteries, the charger is appropriate for numerous different battery chemistries, together with the flooded and sealed lead-acid batteries.

The datasheet signifies that the charger is as much as 97% environment friendly when charging with a present of 6A. The effectivity of the charger decreases because the charging present will increase.

The one characteristic which units it other than every other product is the MPPT for solar-powered purposes. The on-chip logic of LT8491 IC allows true MPPT perform, which constantly tracks the utmost energy level always. As a way to choose the utmost worth on the facility curve, it periodically sweeps the enter panel voltage.

The LT8491 features a slave I2C suitable interface for digital management of the charger settings and digital readouts of charger telemetry and standing. The module is suitable with an MS Home windows based mostly GUI utility referred to as simpleLT8491, which allows the consumer to observe and management the telemetry and standing information of the charger and battery pack in actual time.

The DC2703A-A-KIT is able to supporting greater present and voltage for various cell configuration by changing the enter facet MOSFETs and capacitors with ones with greater rankings.

Vital parts:

U1 – ADI LT8491 battery cost controller IC
U2 – ADI LT1636CS8#PBF op-amp
U3 – ADI LTC4359CDCB ideally suited diode controller, 6-pin DFN EP
U4 – 24LC025-I/ST reminiscence EEPROM, 2kb

Options of DC2703A-A-KIT:

  • Operation from photo voltaic panel or DC provide
  • VIN vary: 17V to 54V
  • VBAT vary: 1.3V to 80V
  • Single inductor permits VIN above, beneath, or equal to VBAT
  • Computerized MPPT for photo voltaic powered charging
  • Computerized temperature compensation
  • I2C telemetry and configuration
  • Distant sensing of battery voltage

This charger reference design can be utilized as a photo voltaic charger or a standalone charger for a number of cell chemistries, which embrace Li-ion, LiPo, and SLA. Extra particulars concerning the reference design will be considered by scanning the QR code.

MAXREFDES1219 – a USB BC 1.2 compliant design

The MAXREFDES1219 is an built-in charger design for the 1-cell Li+ battery. The module is an optimum charger for each charging and monitoring. For charging administration, it employs MAX14746 IC, which is a USB charger that integrates a charger detector, linear regulator, and sensible energy selector to offer as much as 2A of charging present.

The module affords options reminiscent of USB charger detection and battery cell monitoring, which incorporates state of cost, open circuit voltage, temperature, present, and so on. The reference design is compliant with USB Battery Charging Rev1.2, which is able to detecting completely different battery charging strategies, together with customary downstream port, charging downstream port, and devoted charging port. The units additionally detect widespread proprietary cost adaptors, together with these from
Apple 1.

This reference design makes use of Maxim Built-in’s MAX17260 gasoline gauge IC, which employs the ModelGauge m5 algorithm that provides excessive estimation accuracy and has a low energy consumption. The charger allows the consumer to set the cost termination voltage between 4.05V and 4.6V.

The MAXREFDES1219 will be configured shortly and simply by utilizing the GUI software program supplied by the corporate. It requires a MAX32660EVSYS breakout board for connecting it with the PC. The MAX32660 module can allow learn and write management of the 2 MAX14746/MAX17260 registers by way of the I2C interface.

The GUI’s demo view window shows the standing and allows the management of each the charger and the gasoline gauge monitor. The software program is simple to make use of and mechanically detects the {hardware} on making the connection.

Vital parts:

U1 – MAX14746 charging IC
U2 – MAX17260 gasoline gauge IC


  • USB Battery Charging Rev. 1.2 compliant
  • Able to detecting proprietary charger, reminiscent of Apple 1
  • Easy GUI for monitoring and controlling the parameters
  • Max present 2A
  • Screens from 1S battery cell
  • Home windows 10 suitable software program
  • I2C serial interface
  • State of cost measurement

Security options:

  • Charger detection
  • JEITA cost safety
  • Thermal safety
  • Battery cell monitoring
  • Open circuit voltage
  • Temperature monitoring
  • Present monitoring

The reference design can be utilized for numerous purposes, which embrace transportable shopper units, digital imaging units (DSC, DVC), transportable industrial units, USB 1-cell pack tools, and so on. Extra particulars concerning the reference design will be considered by scanning the QR code.

DA9318 – 10A quick battery charger

DA9318 from Renesas is a Li-ion quick cell charger reference design that can be utilized as a standalone 1S charger or will be carried out into laptops, smartphones, tablets, and so on. The charger module employs an ATMEL SAM3U microcontroller because the USB transceiver. This provides the I2C performance to the board and likewise the discrete digital IO management GPIO and devoted capabilities.

The cost administration IC DA9318M is able to offering a most charging present of 10A. The charger is able to charging with as much as 98% effectivity delivering 2A cost present. This charger employs a high-efficiency present doubler with an built-in ADC for system monitoring.

The reference design is able to dealing with present as much as 10A whereas sustaining the security of the battery. It operates along with the primary charger, which handles the pre-charge and fixed voltage charging duties. The charger is able to delivering as much as 6A present by utilizing the usual Kind C cable. The quick charging is achieved by the doubler circuit that makes use of a high-efficiency capacitive divider. The output voltage it offers is given by VIN/2.

The module has a number of security options, which embrace an built-in reverse safety that blocks present circulation in each the instructions when the gadget is in off state. The DA9318 employs six {hardware} based mostly security capabilities for any undervoltage or overvoltage situation. All safety-triggered occasions result in an automated shutdown and are reported by way of an interrupt to the system.

It employs an 8-bit ADC to maintain a examine on parameters reminiscent of enter present, output present, voltage, and junction temperature. For software program supervision a programmable watchdog timer and for battery overload safety a security timer are included.

The module employs two energy monitoring INA226 ICs, which allow the measurement of the primary charger enter voltage and enter present and permits the monitoring of the battery parameters. I2C protocol is used for communication.

When the cost present reaches a handover cost present threshold, which is arbitrarily set to 0.9A, the DA9318 is switched off and the primary charger is enabled and finishes off the cost cycle. The module is over 98% environment friendly when supplying an output present of 0.9A.

Vital parts:

U1 – DA9318 charging IC
U2 – ATMEL SAM3U microcontroller


  • Protected high-voltage direct charging
  • Journey adaptor detection
  • Consumer programmable overcurrent ptotection threshold
  • Constructed-in fault safety
  • Excessive immunity of false triggering beneath transients
  • Responds to enter overvoltage in lower than 1µs
  • Fault indication for numerous fault occurrences
  • 10A output present (DA9318M)
  • 98% effectivity at 2A
  • 10% present sense accuracy (DA9318M)
  • Reverse and ahead present safety in IDLE mode
  • I2C suitable 2-wire interface

Security options:

  • Computerized shutdown in fault situation
  • Excessive-accuracy safety thresholds
  • Overcurrent safety
  • Reverse and ahead present safety in IDLE mode
  • Junction temperature monitoring

This charger reference design can be utilized in numerous units, together with cell, standalone Li-ion battery chargers, tablets, bigger battery packs, laptops, and so on. Extra particulars concerning the reference design will be discovered by scanning the QR code.

The writer, Sharad Bhowmick, works as a Know-how Journalist at EFY. He’s enthusiastic about energy electronics and vitality storage applied sciences. He desires to assist obtain the aim of a carbon impartial world.



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