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RP115H201B-T1-FE Datasheet(PDF) 10 Page - RICOH electronics devices division |
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RP115H201B-T1-FE Datasheet(HTML) 10 Page - RICOH electronics devices division |
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10 / 39 page  RP115x NO. EA-274-150708 10 REVERSE CURRENT PROTECTION CIRCUIT The RP115x Series include a Reverse Current Protection Circuit, which stops the reverse current from VOUT pin to VDD pin or to GND pin when VOUT becomes higher than VIN. Usually, the LDO using Pch output transistor contains a parasitic diode between VDD pin and VOUT pin. Therefore, if VOUT is higher than VIN, the parasitic diode becomes forward direction. As a result, the current flows from VOUT pin to VDD pin. The ICs of this series switches the mode to the reverse current protection mode before VIN becomes lower than VOUT by connecting the parasitic diode of Pch output transistor to the backward direction, and connecting the gate to VOUT pin. As a result, the Pch output transistor is turned off. However, from VOUT pin to GND pin, via the internal divider resistors, very small current IREV flows. Switching to either the normal mode or to the reverse current protection mode is determined by the magnitude of VIN voltage and VOUT voltage. For the stable operation, offset and hysteresis are set as the threshold. The detector threshold is set to VREV_DET and the released voltage is set to VREV_REL. Therefore, the minimum dropout voltage under the small load current condition is restricted by the value of VREV_REL. Following figures show the diagrams of each mode, and the load characteristics of each mode. When giving the VOUT pin a constant-voltage and decreasing the VIN voltage, the dropout voltage will become lower than VREV_DET. As a result, the reverse current protection starts to function to stop the load current. By increasing the dropout voltage higher than VREV_REL, the protection mode will be released to let the load current to flow. If the dropout voltage to be used is lower than VREV_REL, the detection and the release may be repeated. The operating voltage guaranteed level of the reverse current protection circuit is for VOUT ≥ 0.7V. If VIN=0V, the reverse current protection mode becomes always active. VDD GND VOUT CE Vref IOUT Reverse Detector + VDD GND VOUT CE Vref IREV Reverse Detector + Figure 1. Normal Operation Mode Figure 2. Reverse Current Protection Mode |
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