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BQ24773: Comparison of BQ24773 and BQ25895 ...?

Rahul Surawase48
Expert 2395 points
Part Number: BQ24773
Other Parts Discussed in Thread: BQ25895, TPS61088

Hello TI, 

               We are working on Battery management system to our device, Battery as UPS to the system 
Because of System output power rating TI team suggest the BQ24773 better than BQ25895 to avoid heat sink problem and to achieve output power (5V/5A)

1.what is the difference between the BQ24773 and BQ25895, based on feature..? 
2.as per price comparison BQ24773 is costly than BQ25895, why..?
3.By using BQ24773 how to regulate or get 5V ouput voltage ..?
4.In BQ25895 there is time delay for (PMID) boost conversion 30mSec to switch system I/P source to battery source, BQ24773 require any time switch the power source ..?
5.Need to use boost converter(TPS61088) with BQ24773 ..?
6. what is the Output voltage BQ24773 when I/P source is OFF and battery is power to the system..?
7. why the price of BQ24773 is higher then BQ25895, BQ24773 require external power path management and complex support circuit.

Please clear the mention point it is valuable to move further of system design, thanks for your valuable support and quick response.

Thank & Regard, 

Rahul Surawase    

  • 0
    TI__Mastermind 25800 points

    Hey Rahul,

    There are many differences between the two chargers. I recommend you review the two datasheets to dig deeper into the feature differences. As a brief summary,  will answer your questions:

    1) Because the parts are vastly different, I will describe each one separately:

    a. BQ24773: Charging controller, meaning it requires external power stage components in order to function. There is no external control for charging on this device; i.e. the host must control the device in order for charging to occur. Other prominent features are the integrated comparator, the integrated driver for the external input power path FETs, the /PROCHOT pin features which is used as an Intel requirement, as well as other analog voltage outputs for external ADC reading of the battery current, input current, and system power. This charger does not have OTG, or reverse boost mode. And it is a 4S capable charger, with programmable current up to 8128mA given a 10mOhm resistor. It also supports up to a 24V input source.

    b. BQ25895: Integrated charger, meaning it does not require external power stage components. This charger can be externally controlled to disable charging or enable charging. A few prominent features are the D+/D- support for BC1.2, support for High Voltage adapter protocols, an integrated 7-bit ADC to monitor the input and output charging parameters, a TS pin for battery temperature sensing, OTG reverse boost mode for power bank applications, and IR compensation to sense the battery voltage remotely. It can only support 1S batteries, with a programmable current up to 5A. And it only supports up to a 14V input. 

    2. The voltage ratings for the pins, the internal gate drivers, and extra features like /PROCHOT, analog outputs, AC FET driver, and the independent comparator will all impact the price point.

    3. This can be programmed via an I2C register.

    4. Similar to the BQ25895, the BQ24773 can switch over power supplies between the battery and the input source fairly rapidly. However, because the BQ24773 does not have OTG, the switch over is ONLY from the input source to the battery source, rather than the input source, to the battery source, to 30ms the OTG output. 

    5. If you want the OTG feature, yes.

    6. It is the battery voltage, unless you disable the external BATFET. In that case, it will be the battery voltage minus the external FET's body diode drop.

    7. This was answered in (2).

    Regards,

    Joel H