TPS25940: Difference between TPS25940A and TPS25942A

Hi Jiaxin,

The difference between TPS25940A and TPS25942A is on Pin no. 1 .

Pin 1 on TPS25940A is DevSleep Mode control. A high at this pin will activate the DevSleep mode(Low Power Mode). 

• TPS25940 provides a dedicated DevSleep interface terminal (DEVSLP) to drive the device in low power mode. The DEVSLP terminal is compatible with standard hardware signals asserted from the host controller. When pulled high, it puts the device in low power DevSleep mode. In this mode, the quiescent current consumption of the device is limited to less than 130 µA (95 µA typical). During this mode, the output voltage remains active, the overload current limit is set to I(DEVSLP(LIM)) and functionality of reverse comparator and current monitoring is disabled. All other protections are kept active ensuring the safety of the system even in DevSleep mode.

Pin 1 on TPS25942A is Diode Mode control pin. A high at this pin activates the non-ideal diode mode.

• The device provides a Diode Mode, where the power path from IN to OUT acts as a non-ideal diode rather than a FET, as shown in Figure 53. This mode is activated through DMODE terminal. This is an active high terminal with internal pull-down. The terminal is useful in Power-Mux applications to switch over from master to slave supplies and vice-versa smoothly, when two supplies are within a diode drop of each other. A high at this terminal activates the non-ideal diode mode. In this mode, the circuit breaker functionality (TPS25944x) is disabled and the overload current limit is set to 50 % of current limit determined by R(ILIM) resistor.