Torex battery charger ICs use constant-voltage (CV) and constant-current (CC) charging methods for 1-cell Li-ion batteries and Li-polymer batteries. Charging cycles are carried out in the sequence of an initial trickle charging mode followed by a main charging mode.
These IC also support temperature control based on JEITA, making it possible to safely charge Li-ion batteries by controlling the CV charge voltage and CC charge current according to the temperature.
The line-up also includes products that can be set with a charging current of 5mA, which is ideal for small, low capacity lithium batteries in equipment such as wearable devices.
The XC6806 is a linear Li-Ion/Li-Po battery charger with a 450mA Input Current Limit and integrated Current Path to maintain and prioritise the system load during the charging cycle. It also includes a novel Storage Mode Shutdown function to help conserve battery life whilst the end product is in transit to the shops.
The integral input current limit makes the XC6806 ideal for USB charging or applications that use smaller AC/DC adaptors. The temperature monitoring function meets JEITA standards and by controlling the charge voltage and charge current as appropriate for the temperature, the battery can be charged safely. Additional protective functions include a safety timer, UVLO, thermal control, and reverse current protection.
The Storage Mode Shutdown function completely shuts off power supply from the battery to the system to prevent battery leakage current while the device is in storage. When a power is connected to VIN the Shutdown Mode is cleared. This allows the device to be operated with full battery immediately after purchase even if it has been in storage for extended periods of time.
The XC6806 is available in the small USP-10B or LGA-10B01 package and a charging circuit can be designed with minimal external components.
|Operating Voltage Range||4.5V ~ 6.0V|
|CC Charge Current||10mA ~ 380mA|
|CV Charge Voltage||3.5V ~ 4.45V|
|BAT Sink Reverse Current||0.1µA|
|Trickle Charge Mode||Yes|
|Recharge Voltage 25oC||Vcv - 0.1|
|Battery Temperature Monitor||Optional|
|Thermal Shutdown||Thermal Control|
|Reverse Current Protection||Yes|
|Mains Charge Hold Time||5hr|
|Trickle Charge Hold Time||0.5hr|
After production, the time from shipment of finished goods to them being sold and used by the end customer may be a few months or more, depending on the supply route from factory to warehouse and to retail outlet.
During this time, to avoid the battery discharging, the Li-ion / Li-Po cell should ideally be disconnected from the system. This is not always possible with traditional Charging IC, but the XC6806 includes an additional Charge Switch to allow the user to cut-off the connection between battery and the System.
The connection is cut using the integral diode of the Charge SW. A toggle signal to the SD pin enables the Shutdown mode operation when there is no VIN and once enabled, the consumption current from the BAT pin is only 0.1μA.
Power can be supplied to the system from the OUT pin while an Li-ion battery is charged at the same time from the BAT pin. An internal input current limiting function sets a limit so that current can be supplied while preventing the input (VIN) from reaching an over-current condition.
The XC6803/04/05/08 are Constant-Voltage (CV) and Constant-Current (CC) type charging IC for linear charging of single-cell Li-ion and Li-polymer batteries.
An LED can be connected to the charge status output pin to allow confirmation of charging by LED illumination. The IC are housed in small USP-6EL and USP-6B07 packages with excellent thermal characteristics. A charge circuit can be configured using a minimum number of external components.The XC6805 & XC6808 are available in an ultra-low profile USP-6B07 package measuring 2.0 x 1.8 x 0.33mm making these our thinnest battery chargers yet. In addition, with the XC6808, when the input supply is removed, the XC6808 automatically enters a low battery sink state, reducing the battery sink current to only 0.1uA (typ.), helping to ensure a long life for smaller batteries.
Li-ion battery temperature monitoring function
The IC monitors the Li-ion battery temperature during charging by means of an NTC Thermistor connected to the THIN pin. CC charging and CV charging are controlled based on the Li-ion battery temperature as shown below to enable safe charging.
Optimised for Small Batteries
To fit very small batteries, the minimum value of trickle charge current and charge completion current is 0.5mA. This ensures safer charging and longer battery life for small mobile equipment.
|Operating Voltage Range||4.5V~6.0V||4.5V~6.0V||4.5V~6.0V||4.5V~6.0V||4.5V~6.0V|
|CC Charge Current||40mA ~ 280mA||200mA ~ 800mA||5mA ~ 40mA||10mA ~ 385mA||5mA ~ 40mA|
|CV Charge Voltage||4.2V (3.5V~4.45V)||4.2V, 4.35V, 4.4V Fixed|
|BAT Pin Reverse Current||0.5µA||4.5µA||0.5µA||0.1µA||0.1µA|
|Trickle Charge Mode||Yes||Yes||Optional||Yes||Optional|
|Battery Temperature Monitor||JEITA||JEITA (Opt)||JEITA (Opt)||JEITA (Opt)||JEITA (Opt)|
|Thermal Shutdown||Yes||Yes||Yes||Thermal Control||Yes|
|Reverse Current Protection||Yes||Yes||Yes||Yes||Yes|
|Smallest Package Dimensons (mm)||2.0 x 1.8 x 0.4||2.0 x 1.8 x 0.4||1.8 x 2.0 x 0.33||2.5 x 1.6 x 0.4||1.8 x 2.0 x 0.33|