• State TI Thinks Resolved
  • Locked Locked
  • Replies 14 replies
  • Answers 4 answers
  • Subscribers 64 subscribers
  • Views 543 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25730: BAQ25730 power delivery to the System

Rahul Surawase48
Expert 2395 points
Part Number: BQ25730
Other Parts Discussed in Thread: BQ24800, BQ24773, , BQ40Z50, BQ25723

Hello TI, 
               We have few question about the Battery charging IC,

1. we are looking for to get maximum power from input adaptor and delivery to Output system, parallelly need to charge and discharge battery as per the requirement. 
   a. At input side there is 60-100W Type C adaptor for power to system, if there is 20V/5A of input power is it possible to get 100W output power from battery charging  IC for to use it System power and Battery charging
   b. there is any solution to get 20V/4A from battery charging IC Output for system power and rest 20W(4.2V/4.5A) for battery charging ..?


2. We are looking for to design BMS for below mention system, 
   a. Input adaptor is rated 60/100W with Type C connector
   b. Output load,
                          i. Maximum Load 60W
                          ii. Nominal load 35W
                          iii. Minimum load 20W
    c. Battery Pack: 13.4Ah Lithium ion cell  (3.7-4.2 Nominal charge voltage)

 Help us to select correct part for application which full fill all requirement, Suggest battery charging IC  as per the application requirement.

Thanks, 

Rahul 


                          

  • 0
    TI__Mastermind 33205 points

    You may take a look at BQ24800. It has a direct path to the system, which allowing you to power the system directly from the adapter. The buck converter charges 1S battery at the same time. 

    www.ti.com/.../BQ24800

  • 0 in reply to Tiger Zhou
    Expert 2395 points

    Hello Tiger, 

                          I think you not getting my point, we already design one BMS system by using BQ24773 and with other required supporting components like battery Fuel gauge & Booster.

    As I mention before, I want to get maximum power from Input adaptor to deliver to system (Load)  but in that case Battery if battery want to charge and discharge it will need to happen safely( As per the battery charging configuration parameter). 

    BQ24800 is not suitable for my application, there is no USB PD feature and not satisfying above mention parameter.

    Looking for some upgraded Chip which consist of most battery charging IC feature like, 

    1. USB C/PD compatible

    2. Power Path

    3. USB D+/D-/BC1.2 integrated 

    Thanks, 

    Rahul 

  • 0 in reply to Rahul Surawase48
    Expert 2395 points

    Hello TI, 

                  If i am Getting 100W(20V/5A) from Input adaptor, Can get that power as it is to output of the Battery charging IC ..? (No matter what is the Output voltage and current).

    If it is possible, please suggest the part number of battery charging IC and If no, Please suggest the alternative solution.

    Thanks, 
    Rahul 

  • 0 in reply to Rahul Surawase48
    TI__Mastermind 33205 points

    BQ25730 is a high efficiency, high power battery charge controller. It has an NVDC architecture, which means the system voltage is close to the battery voltage during charging and discharging. It also comes with a Pass-Through Mode (PTM), which connects the adapter voltage directly to the system rail. It achieves 99% efficiency from the adapter to the system. BQ25730 supports USB PD as well. 

    www.ti.com/.../BQ25730EVM

  • 0 in reply to Tiger Zhou
    Expert 2395 points

    Hello Tiger, 
                      When battery charge IC in PTM(Pass Through Mode), is it allow to battery for charging and discharging ..? (We are not aware about this feature there is any detail technical document of PTM of battery charger IC, Please share with us)

    Thanks, 

    Rahul

  • 0 in reply to Rahul Surawase48
    TI__Mastermind 33205 points

    It simply turns on the Q1 and Q4 (refer to the datasheet diagram) in PTM. Charging or discharging is not suggested during PTM.

  • 0 in reply to Tiger Zhou
    Intellectual 445 points

    Dear Tiger,

    Thank you for the help and information provided by you.

    Let me give you a clear requirement so that you can help us narrows down the component:

    1. We are planning to use Universal Type C Adapter, which could provide 60 Watt to 100 Watt, with Voltage and current Range as per Type C Standards, eg.: 5V/5A, 12V/5A, 20V/5A, etc
    2. Our System is running at 2 voltage ranges, one where we need 5V/7A and 12V/2A, which is equivalent to 60 Watt. Here we are planning to use 2 Boosters/Buck one for 5V and one for 12V, now based on battery series/parallel combination we will use Buck or Boost respectively.
    3. Here we are planning to use 4 or 6 Batteries of 3350mAh/each, the battery combination can be series or parallel.

    Based on the above specifications we need a Battery Charging IC and Battery Guage and it should at least cover the following things:

    1. Power Path Management
    2. Auto Charging and Discharging, with system load power delivery
    3. USB PD/ USB 3.0/ USB C, basically Battery Charging IC should be able to select the required power from the Standard Type C Adapter
    4. USB OTG will be used to charge external devices other than the system.
    5. All aspects of batteries should be taken care of by the battery charging IC's

    Based on the above parameter please, suggest appropriate Charging IC and Guage.

    Regards,

    Ajit Wadekar

  • 0 in reply to Ajit Wadekar7
    TI__Mastermind 33205 points

    Hi, Ajit,

    Thanks for sharing the design specifications. BQ25730 is the right choice. It has a wide input range to accommodate 5V to 20V. It can charge a 4S battery and provide a system voltage for your downstream converters. You may also need a USB PD controller to negotiate the input voltage and current. There is a PD Charger EVM developed. See below link. 

    https://www.ti.com/tool/USB-PD-CHG-EVM-01

    For the battery gauge, you may take a look at BQ40Z50, or check with the battery gauge group for the latest products. 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Intellectual 445 points

    Dear Tiger,

    Thank you for the feedback.

    Please help me understand the following points:

    1. As per our discussion on https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1050018/bq25723-difference-between-bq25723-and-bq25730/3893312#389331
      1. BQ25723 and BQ25730, both would be good options for us, right? Also, the higher frequency would be better?
    2. For Battery Guage,
      1. We are looking for I2C Compatible devices, as we have all systems controlled through I2C
    3. Battery Charger
      1. Is there any Battery Charging IC with the same specifications as BQ25730 with PD Controller inbuilt?
      2. Also in BQ25730 its mentioned that it is USB-C PD Compatible, what does that mean? and What would be its use case?

    Regards,

    Ajit Wadekar

  • 0 in reply to Ajit Wadekar7
    TI__Mastermind 33205 points

    Slow switching frequency is good for efficiency. High switching frequency could reduce the passive size. Both BQ25723 and BQ25730 will work in your application, you can make a choice. Currently, we don't have charger with build-in PD controller. Our charger is designed to support PD voltages and even provide source/sink capability. 

    https://www.ti.com/tool/USB-PD-CHG-EVM-01

  • 0 in reply to Tiger Zhou
    Intellectual 445 points

    Dear Tiger,

    Thank you for your clarification.

    Can you please suggest to us Battery Guage as well, we have narrowed it down to BQ28Z601, is a good and latest option?

    Regards,

    Ajit Wadekar

  • 0 in reply to Ajit Wadekar7
    TI__Mastermind 33205 points

    Please start another thread regarding the battery gauge. 

  • 0 in reply to Tiger Zhou
    Intellectual 445 points

    Dear Tiger,

    We did that, but we have not got complete clarification on it, and I have discussed complete design parameters here, so I thought you would be the best person to provide us with appropriate recommendations.

    Regards,

    Ajit Wadekar