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CMPWR025 数据表(PDF) 3 Page - California Micro Devices Corp

部件名 CMPWR025
功能描述  Dual Input SmartOR Power Switch
PDF  7 Pages
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制造商  CALMIRCO [California Micro Devices Corp]
网页  http://www.calmicro.com
标志 CALMIRCO - California Micro Devices Corp

CMPWR025 数据表(HTML) 3 Page - California Micro Devices Corp

  CMPWR025 Datasheet HTML 1Page - California Micro Devices Corp CMPWR025 Datasheet HTML 2Page - California Micro Devices Corp CMPWR025 Datasheet HTML 3Page - California Micro Devices Corp CMPWR025 Datasheet HTML 4Page - California Micro Devices Corp CMPWR025 Datasheet HTML 5Page - California Micro Devices Corp CMPWR025 Datasheet HTML 6Page - California Micro Devices Corp CMPWR025 Datasheet HTML 7Page - California Micro Devices Corp  
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© 2000 California Micro Devices Corp. All rights reserved.
10/18/2000
3
CMPWR025
CALIFORNIA MICRO DEVICES
215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
INTERFACE SIGNALS
V
CC1 is the primary power source, which is given priority
when present. If pin 8 (HYS) is unconnected, then the
hysteresis level is 75mV (typ.). Whenever the primary
power source drops below the secondary supply V
CC2 by
more than 125mV, it will immediately become dese-
lected. When the primary power source is restored to
within 50mV of the secondary supply, the primary power
source will once again be selected and provide all the
output current.
When V
CC1 is selected, it will supply all the internal
current requirements which are typically 20µA. When
V
CC1 is not selected, there will be no current loading on
this input.
V
CC2 is the secondary power source and is selected
when the primary source has fallen below it by more
than 125mV (or 200mV if pin 8 is grounded). The
secondary source will be deselected immediately once
the primary source is restored to within 50mV of V
CC2 .
When V
CC2 is selected, it will supply all the internal
current requirements which are typically 20µA. When
V
CC2 is not selected, there will be no current loading on
this input.
GND is the negative reference for all voltages.
V
OUT provides the power for the load. During normal
operation the impedance from V
OUT to the selected
supply is typically less than 0.28
Ω, 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.
HYS is the user-selectable hysteresis input. The hyster-
esis level is set to 150mV when grounding pin 8. The
default hysteresis level is set to 75mV by leaving pin 8
unconnected. Using 150mV 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 150mV, the primary
supply V
CC1 must now fall 200mV below the secondary
supply V
CC2 before it becomes deselected.
Important note: There is an internal connection
between pins 1 and 2. These pins must be connected
externally.
There is an internal connection between pins 3 and 4.
These pins must be connected externally.
There is an internal connection between pins 6 and 7.
These pins must be connected externally.
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