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

TQ,

The differences are minor.

Regards,

John

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