CMPWR025 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
MFG CO.
CMPWR025 Datasheet PDF : 8 Pages
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CMPWR025
TYPICAL APPLICATION CIRCUIT
VCC1 +
5V −
VCC2
+
5V −
CMPWR025
VCC1
VCC2
VOUT
HYS
GND
VOUT
+ COUT
10 mF
SIMPLIFIED ELECTRICAL SCHEMATIC
VCC1
SW1
0.2 W
+
-
SW2
VOUT
0.2 W
GND
VCC2
HYS
GND
PACKAGE / PINOUT DIAGRAM
Top View
VCC1
1
VCC1
2
VCC2
3
VCC2
4
8
HYS
7
VOUT
6
VOUT
5
GND
8−Pin MSOP
CMPWR025R
Table 1. PIN DESCRIPTIONS
Pin(s)
Name
Description
1, 2
VCC1
VCC1 is the primary power source, which is given priority when present. If pin 8 (HYS) is unconnected, then
the hysteresis level is 75 mV (typ.). Whenever the primary power source drops below the secondary supply
VCC2 by more than 125 mV, it will immediately become deselected. When the primary power source is
restored to within 50 mV of the secondary supply, the primary power source will once again be selected and
provide all the output current. When VCC1 is selected, it will supply all the internal current requirements which
are typically 20 mA. When VCC1 is not selected, there will be no current loading on this input.
Pins 1 & 2 must be connected together externally.
3, 4
VCC2
VCC2 is the secondary power source and is selected when the primary source has fallen below it by more
than 125 mV (or 200 mV if pin 8 is grounded). The secondary source will be deselected immediately once the
primary source is restored to within 50 mV of VCC2. When VCC2 is selected, it will supply all the internal
current requirements which are typically 20 mA. When VCC2 is not selected, there will be no current loading on
this input.
Pins 3 & 4 must be connected together externally.
5
GND Negative reference for all voltages.
6, 7
VOUT
Positive voltage output switched from VCC1 or VCC2 inputs. During normal operation the impedance from
VOUT to the selected supply is typically less than 0.28 W, which results in minimal voltage loss from input to
output. During the cold−start interval when both inputs are initially applied, the internal circuitry provides a soft
turn−on for the switches, which limits peak in−rush current.
Pins 6 & 7 must be connected together externally.
8
HYS
HYS is the user−selectable hysteresis input. The hysteresis level is set to 150 mV when pin 8 is grounded.
The default hysteresis level is set to 75 mV by leaving pin 8 unconnected. Using 150 mV hysteresis is
recommended, especially in environments with noisy power supplies, high power supply resistances or high
load currents. If the hysteresis level is set to 150 mV, the primary supply VCC1 must now fall 200 mV below
the secondary supply VCC2 before it becomes deselected.
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