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ZHCSBD3D July 2013 – August 2019 TPS63050 , TPS63051

PRODUCTION DATA.

8.4.3 Adjustable Current Limit

The TPS6305x devices have an internal user programmable current limit that monitors the input current during start-up. This prevents high inrush current protecting the device and the application. During start-up the input current does not exceed the current limit that is set by I_LIM0 pin and I_LIM1 pin. Depending on the logic level applied at these two pins, switching between four different current limit-levels is possible. The variation of those values over input voltage and temperature is shown in Figure 1 through Figure 2. Adjusting the soft-start time further using the soft-start capacitor is possible.

I_LIM0 and I_LIM1 set the current limit as listed in Table 2.

Table 2. Adjustable Current Limit

ILIM1	ILIM0	CURRENT LIMIT SET (WCSP)	CURRENT LIMIT SET (HotRod)
Low	Low	0.4 × I_{IN_MAX}	Not Available
Low	High	0.5 × I_{IN_MAX}	Not Available
High	Low	0.65 × I_{IN_MAX}	0.65 × I_{IN_MAX}
High	High	I_{IN_MAX}	I_{IN_MAX}

The I_LIM0, I_LIM1 pins can be changed during operation.

Given the curves provided in Figure 1 through Figure 2, calculating the output current in the different condition in boost mode is possible using Equation 1 and Equation 2 and in buck mode using Equation 3 and Equation 4.

Equation 1. TPS63050 TPS63051 q1_boost_lvsa92.gif

Equation 2. TPS63050 TPS63051 q1_boost_lvsa92[1].gif

where

η = Estimated converter efficiency (use the number from the efficiency curves or 0.9 as an assumption)
I_IN = Minimum average input current (Figure 2 to Figure 2)

Equation 3. TPS63050 TPS63051 q3_buck_lvsa92.gif

Equation 4. TPS63050 TPS63051 q1_buck_lvsa92[1].gif

where

For η, use the number from the efficiency curves or 0.9 as an assumption.