RP108J

NO.EA-203-150817

10

REVERSE CURRENT PROTECTION CIRCUIT

by connecting the parasitic diode of Pch output transistor to the backward direction, and connecting the gate to

pin are shut down to maintain the reverse current lower than 10

µA.

Switching to either the normal mode or to the reverse current protection mode is determined by the magnitude

set to 30mV (Typ.25

°C) and hysteresis is set to 5mV (Typ.25°C).

Therefore, the minimum dropout voltage under the small load current condition is restricted by the value of

35mV (Typ.25

°C).

Fig.1 and Fig.2 show the diagrams of each mode, and Fig.3 shows the load characteristics of each mode.

lower than 30mV (Typ.25

°C). As a result, the reverse current protection starts to function to stop the load current.

By increasing the dropout voltage higher than 35mV (Typ.25

°C), the protection mode will be released to let the

load current to flow. If the dropout voltage to be used is lower than 30mV (Typ.25

°C), the detection and the

release may be repeated.

GND

CE

Vref

Reverse

Detector

GND

CE

Vref

Reverse

Detector

Fig.1 Normal Mode

Fig.2 Reverse Current Protection Mode

Fig. 3 Reverse Current Protection Mode Detection/ Release &

0

Reverse Current Protection Mode

Normal Mode

Normal Mode

Reverse Current/ Output Current Characteristics

35mV

30mV