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Vaux SWITCH. CM3103 Datasheet

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Vaux SWITCH. CM3103 Datasheet
















CM3103 SWITCH. Datasheet pdf. Equivalent













Part

CM3103

Description

400mA SMARTOR REGULATOR Vaux SWITCH



Feature


CM3103 400mA SmartORTM Regulator with VA UX Switch Features Continuous 3.3V / 40 0mA output from two inputs Complete Pow er Management solution Built-in hystere sis when selecting input supplies Integ rated switch featuring low RDSON (0.25 typ.) • Foldback current limiting protection www.DataSheet4U.com • Ther mal overload shutdown protection • 8- pin SOIC package • Lead-fr.
Manufacture

California Micro Devices

Datasheet
Download CM3103 Datasheet


California Micro Devices CM3103

CM3103; ee version available • • • • Pr oduct Description The CM3103 combines a fixed voltage regulator and a VAUX swi tch in a single 8-pin SOIC package. The voltage regulator is capable of delive ring up to 400mA continuously at 3.3V. The output power is provided from two i ndependent input voltage sources on a p rioritized basis. Power is always taken in priority of VCC, then .


California Micro Devices CM3103

VAUX. When VCC (5V) is present, the devi ce automatically enables the regulator, producing a stable 3.3V output at VOUT , while disabling the VAUX switch. When only VAUX (3.3V) is present, the devic e provides a low impedance direct conne ction (0.25Ω typ.) from VAUX to VOUT. All the necessary control circuitry ne eded to provide a smooth and automatic transition between b.


California Micro Devices CM3103

oth supplies has been incorporated. This allows the VCC input supply to be dyna mically switched without loss of output voltage. The CM3103 is available with optional lead-free finishing. Applicat ions • • • • PCI adapter cards with Wake-On-LAN Network Interface Card s (NICs) Multiple power supply systems Systems with standby capabilities Typi cal Application Circuit S.





Part

CM3103

Description

400mA SMARTOR REGULATOR Vaux SWITCH



Feature


CM3103 400mA SmartORTM Regulator with VA UX Switch Features Continuous 3.3V / 40 0mA output from two inputs Complete Pow er Management solution Built-in hystere sis when selecting input supplies Integ rated switch featuring low RDSON (0.25 typ.) • Foldback current limiting protection www.DataSheet4U.com • Ther mal overload shutdown protection • 8- pin SOIC package • Lead-fr.
Manufacture

California Micro Devices

Datasheet
Download CM3103 Datasheet




 CM3103
CM3103
400mA SmartORTM Regulator with VAUX Switch
Features
• Continuous 3.3V / 400mA output from two inputs
• Complete Power Management solution
• Built-in hysteresis when selecting input supplies
• Integrated switch featuring low RDSON (0.25
typ.)
• Foldback current limiting protection
www.DataSheet4U.cTohmermal overload shutdown protection
• 8-pin SOIC package
• Lead-free version available
Applications
• PCI adapter cards with Wake-On-LAN
• Network Interface Cards (NICs)
• Multiple power supply systems
• Systems with standby capabilities
Product Description
The CM3103 combines a fixed voltage regulator and a
VAUX switch in a single 8-pin SOIC package. The volt-
age regulator is capable of delivering up to 400mA con-
tinuously at 3.3V. The output power is provided from
two independent input voltage sources on a prioritized
basis. Power is always taken in priority of VCC, then
VAUX.
When VCC (5V) is present, the device automatically
enables the regulator, producing a stable 3.3V output
at VOUT, while disabling the VAUX switch.
When only VAUX (3.3V) is present, the device provides
a low impedance direct connection (0.25typ.) from
VAUX to VOUT.
All the necessary control circuitry needed to provide a
smooth and automatic transition between both supplies
has been incorporated. This allows the VCC input sup-
ply to be dynamically switched without loss of output
voltage.
The CM3103 is available with optional lead-free finish-
ing.
Typical Application Circuit
Simplified Electrical Schematic
VCC
VAUX
5V
+ CIN
3.3V 1µF
CM3103
VCC 3.3V/400mA
VOUT
VAUX
GND
+ CEXT
10µF
VCC
VOUT
+
Vdeselect
-
4.2V
Controller
Enable
AuxSw
VAUX
AuxSw
0.25
3.3V
+
-
Regulator Amp
GND
GND
VOUT
© 2004 California Micro Devices Corp. All rights reserved.
01/28/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
L Fax: 408.263.7846 L www.calmicro.com
1




 CM3103
CM3103
PACKAGE / PINOUT DIAGRAM
TOP VIEW
www.DataSheet4U.com
Note: This drawing is not to scale.
N.C.
VCC
VOUT
VAUX
18
27
36
45
GND
GND
GND
GND
8-pin Power SOIC
PIN(S)
1
2
3
4
5-8
NAME
N.C.
VCC
VOUT
VAUX
GND
DESCRIPTION
PIN DESCRIPTIONS
Positive input supply for the voltage regulator. Whenever this supply voltage exceeds the VCCSEL
level (4.4V), it will immediately be given priority and be used to power the regulator output. If this
supply voltage falls below the VCCDES level (4.2V) it will immediately be deselected and no longer
provide power for the regulator output. An internal hysteresis voltage of 0.2V is used to prevent any
chatter during selection and deselection of VCC. The effective source impedance of VCC should be
kept below 0.3 ohm to ensure changeover disturbances do not exceed the hysteresis level.
If the connection to VCC is made within a few inches of the main input filter, a bypass capacitor may
not be necessary. Otherwise a bypass filter capacitor in the range of 1µF to 10µF will ensure ade-
quate filtering.
Regulator output. Power is provided from the regulator or via the low impedance auxiliary switch.
This output requires a capacitance of 10µF to ensure regulator stability and minimize the peak out-
put disturbance during power supply changeover.
Auxiliary voltage power source. This supply is selected only when VCC falls below 4.2V. Under
these conditions an internal switch that provides a very low impedance connection directly between
VOUT and VAUX is enabled .
The negative reference for all voltages. Also functions as a thermal path for heat dissipation.
Ordering Information
PART NUMBERING INFORMATION
Pins
8
Package
Power SOIC
Standard FInish
Ordering Part
Number1
Part Marking
CM3103-01SA
CM3103SA
Lead-free Finish
Ordering Part
Number1
Part Marking
CM3103-01SF
CM3103SF
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
2 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
L Fax: 408.263.7846 L www.calmicro.com
01/28/04




 CM3103
CM3103
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
ESD Protection (HBM)
+2000
V
Pin Input Voltages
VCC
VAUX
[GND - 0.5] to +6.0
[GND - 0.5] to +4.0
V
V
Storage Temperature Range
-40 to +150
°C
www.DataSheet4OUp.ceormating Temperature Range
Ambient
Junction
0 to +70
0 to +125
°C
°C
Power Dissipation (See Note 1)
Internally Limited
W
Note 1: At rated load, the power dissipation will be 0.68Watt (1.7V x 0.4A). Under these conditions, (in a 70°C ambient), the thermal
resistance from junction to ambient (θJA) must not exceed 80°C/W. This is typically achieved with 2 square inches of copper
printed circuit board area connected to the GND pins for heat spreading, or equivalent.
STANDARD OPERATING CONDITIONS
PARAMETER
VCC
VAUX
Ambient Operating Temperature Range
Load Current
CEXT
VALUE
5.0 +0.25
3.3 +0.3
0 to +70
0 to 400
10 +20%
UNITS
V
V
°C
mA
µF
© 2004 California Micro Devices Corp. All rights reserved.
01/28/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
L Fax: 408.263.7846 L www.calmicro.com
3




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