Other Parts Discussed in Thread: TPS62162, , TPS62172-Q1
Hi Ti Team,
This is the part we are using for step down converter: TPS62162-Q1
Input voltage = 5 V
Output voltage = 3.3 V
Maximum required load current = 400 mA.
Maximum current in datasheet description = 1 A
High-side MOSFET forward current limit maximum (Static current limit) I_LIMF from datasheet = 2.45 A
Voltage across the inductor is taken as V_L = 5 - 3.3 = 1.7 V
Output inductor L = 1 uH
Propagation delay = 30 nS (There is no information in the electrical characteristics for the propagation delay, this 30 nS is the value taken from the calculation side in the datasheet, page-11, Eqn-5, So please let me know if there is a standard value for TPS62162 propagation delay )
Dynamic current limit due to propagation delay =
I_LIMF + ( V_L / L ) * t_PD
= 2.45 + ( 1.7 / 1 * 10 ^(-6) ) * 30 * 10 ^ (-9)
= 2.501 A
My output current is only 400 mA. But I just need to make sure that my required load current is less than the rated current. Following are my questions,
1. What is the maximum rated output current, 1A or 2.45 A or 2.501 A ?
2. Is there an over current shut down feature for TPS62162-Q1? I understood that there is a thermal shut down for this device, but I could not find anything as over current shut down?
My intention is to find the maximum shut down time during over current?
3. How much time it will take to shut down the output voltage when EN pin is pulled low? I could not find this information in the datasheet.
Regards,
VT