ADP198ACPZ-R7 Analog Devices, Inc., ADP198ACPZ-R7 Datasheet - Page 15

• Manufacturer Part Number: ADP198ACPZ-R7
• Description: Logic Controlled, 1 A, High-side Load Switch With Reverse Current Blocking
• Manufacturer: Analog Devices, Inc.

Data Sheet
DIODE OR’ing APPLICATIONS
Figure 31 shows an application wherein an ac power supply and
battery are OR’ e d together to provide a seamless transition from
the primary (ac) supply to the secondary (V2) supply when the
primary supply is disconnected. By connecting the enable input
of the
power is automatic.
Figure 32 shows the forward voltage vs. the forward current
characteristics of a Schottky diode and the ADP198. The low on
AC
V2
ADP198
Figure 31.
+
to V2, the transition from ac power to battery
ADP198
VIN
EN
ADP198
in a Typical Diode OR’ing Application
VOUT
6V
V
V2 – (I
OUT
LOAD
=
LOAD
× R
ON
)
Rev. B | Page 15 of 16
resistance of the
diode in diode OR’ing applications.
In addition to low on resistance, the
current is much lower than a typical 1 A, 20 V Schottky
rectifier. For example, at 85°C, the reverse current of a Schottky
rectifier can be as high as 30 μA with only 2.5 V of reverse bias.
Figure 32. Forward Voltage vs. Forward Current of a Schottky
1A
SLOPE =
75mV (V
ADP198
R
1
ON
HYS
Diode and
)
makes it far superior to a Schottky
SCHOTTKY
FORWARD
VOLTAGE
ADP198
300mV
ADP198
FORWARD VOLTAGE (V)
reverse leakage
ADP198