SBVA097 February   2023 TLV758P

 

  1.   Abstract
  2.   Trademarks
  3. 1Theory of Operation
    1. 1.1 Current Limit and Foldback Behavior
    2. 1.2 Current Limit Circuit
  4. 2Current Limit Dring Dropout Operation
    1. 2.1 Bench Results
    2. 2.2 Current Limit vs Input Voltage
  5. 3Conclusion

1.1 Current Limit and Foldback Behavior

The TLV758P LDO device has an internal current limit circuit that protects the regulator during high-load current faults or a short circuit event. The current limit is a hybrid brickwall-foldback scheme. When the current limit circuit detects a high-load current fault and the output voltage is above the VFOLDBACK, the brickwall scheme limits the output current to the current limit ICL. If the output voltage is pulled below VFOLDBACK then the output current starts to fold back until it reaches the short circuit current limit, ISC.

Equation 1. VFOLDBACK = 0.4 × VOUT(nom)

where:

  • ICL = 720 mA
  • ISC = 350 mA
Figure 1-1 Foldback Current Limit