This is a fast-response unidirectional current-sensing solution, generally referred to as overcurrent protection (OCP), that can provide a < 2-μs time response, tresp, overcurrent alert signal to power off a system exceeding a threshold current. In this particular setup, the normal operating load is from 80 mA to 900 mA, with the overcurrent threshold defined at 1 A (IOC_TH). The current shunt monitor is powered from a 5-V supply rail. OCP can be applied to both high-side and low-side topologies. The solution presented in this circuit is a high-side implementation. This circuit is useful in smart speakers and docking stations.
Features
- Input: Iload = 80 mA to 900 mA
- Overcurrent conditions:
- Ioc_th = 1 A
- t_resp = < 2 μs
- Output:
- Vout_oc = 1.2 V
- Vout_release = 1.18 V
- Supply: