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TPS25810A-Q1: Comparison with TPS25810-Q1 on chip level

Kuramochi Tadahiko
Guru 28715 points

Part Number: TPS25810A-Q1
Other Parts Discussed in Thread: TPS25810-Q1, , TPS2514A-Q1

Hi,

Except for  except for blocks which are different specification as below, are TPS25810A-Q1 chip and TPS25810-Q1 common chip?

e2e.ti.com/.../669445

Best Regards,

Kuramochi  

  • 0
    TI__Intellectual 2540 points

    TQ,

    The differences are minor.

    TPS25810A-Q1

    TPS25810-Q1

    Current Limit

    Fixed to 3.4A

    Selectable 3.4A or 1.7A

    Cable Compensation

    Yes, Digital

    No

    Load Detect

    No

    Yes, used for port power mgmt

    Regards,

    John

  • 0 in reply to John Perry
    Guru 28715 points
    John-san,

    I had already checked these information as above link.
    I would like to know the detail.

    Best Regards,
    Kuramochi
  • 0 in reply to Kuramochi Tadahiko
    TI__Intellectual 2540 points

    Kuramochi-san,

    Here is some additional background.

    The TPS25810-Q1 is the original released device for Type-C port control. 

    • The CHG and CHG_HI pins are used to change the Type-C current advertisement and current limit.
    • The /LD_DET pin is an open drain flag pin which indicates when IOUT is >1.95A.  The purpose of this pin for port power management (PPM) as described in section 7.3.3.13 of the datasheet.  Some applications have two Type-C ports, but maybe do not want to provide 3A at the same time to both ports (6A total). In the example drawings of 7.3.3.13 we show how to limit total USB advertised current to 4.5A. This can make the solution cost lower because the DC/DC converter supplying IN1 & IN2 of 2x TPS25810-Q1 only needs to supply ~6.5A max (3.64A [IOUT max current limit for 3A advertisement] + 1.82A [IOUT max current limit for STD or 1.5A advertisement] + 2 * 0.41A [VCONN max current limit].  Without PPM, the DC/DC converter would be required to supply >8.1A for full range OUT max and VCONN max power. 
    • As shown in the table below the current limit is changed depending upon the state of CHG and CHG_HI. For PPM applications, the TPS25810-Q1 can prevent a non-compliant Type-C or legacy device from using >1.82A current when STD or 1.5A is advertised.

    The TPS25810A-Q1 was a minor change from TPS25810-Q1.

    • CHG and CHG_HI change only the Type-C current advertisement.  The current limit remains fixed at 3.4A (typ) as shown in the table below.  Some applications would like to support both Type-C (1.5A) and legacy DCP charging (2.4A), but not Type-C (3A). Using TPS25810A-Q1 with CHG and CHG_HI in the 1 0 case and adding TPS2514A-Q1 for DCP management, it is possible to configure the Type-C port for 1.5A when connected to a Type-C sink (portable device) and still provide up to 2.4A for a legacy portable device that uses D+ and D- signaling.
    • Since the current limit is fixed to 3.64A (max) without regard to CHG and CHG_HI, port power management (PPM) cannot be enforced when the Type-C current advertisement is STD or 1.5A.  To give a new feature in TPS25810A-Q1 we changed the /LD_DET function to /CS function.  /CS is for cable droop compensation as described in 8.3.3.9 of the TPS25810A-Q1 datasheet.

    Hope this helps.

    Regards,

    John

  • 0 in reply to John Perry
    TI__Intellectual 2540 points

    Sorry, tables did not paste.

    TPS25810-Q1 (Table 3 from datasheet)

    CHGCHG_HICC CAPABILITY BROADCASTCURRENT LIMIT (TYP)LOAD DETECT THRESHOLD (TYP)
    0 0 STD 1.7 A NA
    0 1 STD 1.7 A NA
    1 0 1.5 A 1.7 A NA
    1 1 3 A 3.4 A 1.95 A

    TPS25810A-Q1 (Table 3 from datasheet)

    CHGCHG_HICC CAPABILITY BROADCASTCURRENT LIMIT (TYP)CS THRESHOLD (TYP)
    0 0 STD 3.4 A 1.95 A
    0 1 STD 3.4 A 1.95 A
    1 0 1.5 A 3.4 A 1.95 A
    1 1 3 A 3.4 A 1.95 A
  • 0 in reply to John Perry
    Guru 28715 points

    John-san,

    Thank you for your information.

    My inquiry was unclear, I'm sorry.

    The customer would like to know if TPS25810-Q1 and TPS25810A-Q1 are same tendency on the reliability.

    They have tested TPS25810-Q1 and confirmed what it is no problem on reliability.

    And they hope what TPS25810A-Q1 test result is same with TPS25810-Q1.

    I asked chip difference because I think that reliability is almost same if chips is similar.
    Needless to say, they will test actually.

    They are requiring this for their reference.

    Best Regards,

    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Intellectual 2540 points

    Kuramochi-san,

    The reliability should be identical.  They share the same base chip. 

    Regards,

    John