Part Number: BQ2057W Other Parts Discussed in Thread: BQ2057 Hi, we are looking to use the BQ2057W with a two li polymer batteries, max voltage 7.4 volts, but they both have there own thermistor in each battery.
The problem is that the BQ2057 only has…
Part Number: BQ2057W Other Parts Discussed in Thread: BQ2057 , CSD25404Q3 We are Using BQ2057 battery charger IC in our product to charge the 8.4V battery through 9V-1A adapter. As per the datasheet to enable/disable the charging process, we used AO4409…
Part Number: BQ2970 Other Parts Discussed in Thread: BQ2057 , , BQ25100 New product needs under 100mAh battery. Do you know if there’s a lithium cell size threshold when it is makes sense or required to have cell protection?
Do I need a bq2970 and…
Part Number: BQ2057W Other Parts Discussed in Thread: BQ2057 , MSP430F5529 Good evening....
I am using a BQ2057W (8.4V) part and want to take the STAT output to an MSP430 input....The MSP430 is a 3.3V part.....The STAT will be driven, low, high or tri…
Hi
The IC should not be heating, the power dissipation should be in Q1 and it will be high. High thermal rise of the BQ2057 point to a damaged device
In you above test ( Circuit 1 and Circuit 2) the problem followed the IC. If the IC is heating and…
Hello Rahul
The BQ2057 is an older generation device with a large number of external parts.
The BQ24040 should meet your requirements, it is a smaller device with very few external parts.
Another engineer assisted with calculations based on your…
for bq25700A and 703A is host controlled charger which means you will need an MCU to control it.
I guess I am confused about which function in bq2057 that you are referring to? the bq2057 is a standalone linear charger which cannot boost up the lower…
Uzair,
The charger's efficiency affects the heat dissipation. bq2057 is a linear charger. You can think of it like an LDO. Heat loss is determined by the difference between the input and output voltages and the charging current. Power dissipated is…
Part Number: BQ25700A Other Parts Discussed in Thread: BQ25700 , BQ25703 , BQ2057 , In my new project I want to charge a 7,4V Li-ion battery (two cells) with a lower Input: 5V from USB.
In my previous post I was advised to use BQ25700 or BQ25703 ICs…
