TPS2HB35-Q1: Load current query

Hi Sreelekshmi,

The thermal information stated on the datasheet is with respect to JEDEC 2s2p standards. Therefore, if your board has more copper or has heatsinking capability, the final result will be different. 

At higher temperatures, it is expected that the DC supported current will decrease as the device will heat up and hit thermal shutdown easier. From back of the envelop calculations the allowed power dissipation assuming 2s2p is as follows:

P_d = (Tj-Ta)/R,t,j,a

       =( 150 - 105 ) / 32.9

       = 1.3677 W

From this, we can get the total current passing through each channel by first dividing the power by 2(assuming equal splitting of current on the channel) and then accounting for the max ON resistance (70mOhm, worst case)

0.682 W = I^2 * R_on

I^2 = 9.76

I = 3.12 A

Therefore, using some worst case considerations and assumptions, the max supported current DC is around 3.12A per channel at 105C. Please note the actual value could be higher than that as this is only a back of the envelop calculation that assumes 2s2p and then worst case R_on conditions.

Thanks,

Shreyas