CALMIRCO CM3103 400ma smartor regulator vaux switch Datasheet

CM3103
400mA SmartORTM Regulator with VAUX Switch
Features
Product Description
•
•
•
•
The CM3103 combines a fixed voltage regulator and a
VAUX switch in a single 8-pin SOIC package. The voltage regulator is capable of delivering up to 400mA continuously 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.
•
•
•
•
Continuous 3.3V / 400mA output from two inputs
Complete Power Management solution
Built-in hysteresis when selecting input supplies
Integrated switch featuring low RDSON (0.25Ω
typ.)
Foldback current limiting protection
Thermal overload shutdown protection
8-pin SOIC package
Lead-free version available
Applications
•
•
•
•
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 (0.25Ω typ.) from
VAUX to VOUT.
PCI adapter cards with Wake-On-LAN
Network Interface Cards (NICs)
Multiple power supply systems
Systems with standby capabilities
All the necessary control circuitry needed to provide a
smooth and automatic transition between both supplies
has been incorporated. This allows the VCC input supply to be dynamically switched without loss of output
voltage.
The CM3103 is available with optional lead-free finishing.
Typical Application Circuit
Simplified Electrical Schematic
CM3103
VCC
VCC
5V
+ CIN
VAUX
3.3V
1µF
VCC
VOUT
3.3V/400mA
VOUT
4.2V
VAUX
+
Enable
-
AuxSw
Vdeselect
+ CEXT
GND
+
Controller
3.3V
-
10µF
Regulator Amp
AuxSw
0.25Ω
VAUX
VOUT
GND
GND
© 2004 California Micro Devices Corp. All rights reserved.
01/28/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214
▲ Fax: 408.263.7846
▲
www.calmicro.com
1
CM3103
PACKAGE / PINOUT DIAGRAM
TOP VIEW
N.C.
VCC
VOUT
VAUX
1
8
2
7
3
6
4
5
GND
GND
GND
GND
8-pin Power SOIC
Note: This drawing is not to scale.
PIN DESCRIPTIONS
PIN(S)
NAME
DESCRIPTION
1
N.C.
2
VCC
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 adequate filtering.
3
VOUT
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 output disturbance during power supply changeover.
4
VAUX
Auxiliary voltage power source. This supply is selected only when V CC falls below 4.2V. Under
these conditions an internal switch that provides a very low impedance connection directly between
VOUT and VAUX is enabled .
5-8
GND
The negative reference for all voltages. Also functions as a thermal path for heat dissipation.
Ordering Information
PART NUMBERING INFORMATION
Standard FInish
Lead-free Finish
Ordering Part
Ordering Part
Pins
Package
Number1
Part Marking
Number1
Part Marking
8
Power SOIC
CM3103-01SA
CM3103SA
CM3103-01SF
CM3103SF
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
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430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214
▲ Fax: 408.263.7846
▲
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01/28/04
CM3103
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
+2000
V
[GND - 0.5] to +6.0
[GND - 0.5] to +4.0
V
V
-40 to +150
°C
Operating Temperature Range
Ambient
Junction
0 to +70
0 to +125
°C
°C
Power Dissipation (See Note 1)
Internally Limited
W
ESD Protection (HBM)
Pin Input Voltages
VCC
VAUX
Storage Temperature Range
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 (θ JA) 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
VALUE
UNITS
VCC
PARAMETER
5.0 +0.25
V
VAUX
3.3 +0.3
V
Ambient Operating Temperature Range
0 to +70
°C
Load Current
0 to 400
mA
CEXT
10 +20%
µF
© 2004 California Micro Devices Corp. All rights reserved.
01/28/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
▲ Tel: 408.263.3214
▲
Fax: 408.263.7846
▲
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3
CM3103
ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1)
SYMBOL
PARAMETER
CONDITIONS
Regulator Output Voltage
0mA < ILOAD < 400mA
MIN
TYP
MAX
UNITS
3.135
3.300
3.465
V
ILIM
Regulator Current Limit
VOUT > 0V
410
500
mA
IS/C
Short Circuit Current
VCC=5V, VOUT < 0V
150
mA
VR LOAD
Load Regulation
VCC=5V, 5mA < ILOAD < 400mA
20
mV
VR LINE
Line Regulation xx
ILOAD = 5mA; 4.5V < VIN < to 5.5V
2
mV
VCCSEL
VCC Select Voltage
VAUX present
VCCDES
VCC Deselect Voltage
VAUX present
Hysteresis Voltage
VAUX present; See Note 2
VOUT
VHYST
4.40
4.00
V
4.20
V
0.20
V
0.25
0.40
Ω
5
100
µA
VCC > VCCSEL, ILOAD=0mA
0.8
1.5
mA
VAUX Supply Current
VAUX is selected, ILOAD=0mA
0.20
0.30
mA
Ground Current
VAUX is selected, (V CC/SBY = 0V)
VCC/SBY = 5V, ILOAD = 0mA
VCC/SBY = 5V, ILOAD = 400mA
0.20
0.80
1.00
0.30
1.50
2.00
mA
mA
mA
RSW
VAUX Switch Resistance
IRCC
IRAUX
VCC Reverse Leakage
VAUX Reverse Leakage
One supply input taken to GND while the others
remain at nominal voltage.
ICC
VCC Supply Current
IAUX
IGND
TDISABLE
THYST
4.60
Shutdown Temperature
Thermal Hysteresis
160
20
°C
°C
Note 1: Operating characteristics are over Standard Operating Conditions unless otherwise specified.
Note 2: The disturbance on VCC during supply changeover should be kept below the hysteresis voltage to prevent any chatter. The
source resistance on the V CC supply should be kept to less than 0.3 ohms to ensure precise switching.
© 2004 California Micro Devices Corp. All rights reserved.
4
430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214
▲ Fax: 408.263.7846
▲
www.calmicro.com
01/28/04
CM3103
Performance Information
CM3103 Typical DC Characteristics (nominal conditions unless specified otherwise)
VAUX Supply Current vs. Voltage
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.5
Supply Current [mA]
Supply Current [mA]
VCC Supply Current vs. Voltage
0.4
0.3
0.2
0.1
0
1
2
3
4
VCC Input Voltage [V]
5
6
0.0
0
1
2
3
VAUX Input Voltage [V]
Ground Current vs. Output Load
4
Line Regulation
3.4
Ground Current [mA]
Regulator Output Voltage [V]
1.2
1.1
1.0
0.9
0.8
0.7
5mA
3.3
3.2
400mA
3.1
3.0
0.6
0
100
200
300
Load Current [mA]
400
3.5
4
4.5
5
Line Voltage [V]
5.5
6
© 2004 California Micro Devices Corp. All rights reserved.
01/28/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
▲ Tel: 408.263.3214
▲
Fax: 408.263.7846
▲
www.calmicro.com
5
CM3103
Performance Information (cont’d)
CM3103 Typical DC Characteristics (cont’d, nominal conditions unless specified otherwise)
Foldback Current Limit Protection
3.45
Regulator Output Voltage [V]
Regulator Output Voltage [V]
Load Regulation (5V supply)
3.40
3.35
3.30
3.25
3.20
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
3.15
0
100
200 300 400
Load Current [mA]
0
500
Regulator Dropout Characteristics
200 300 400
Output Current [mA]
500
600
Switch Resistance vs. VAUX supply
1.2
0.40
ON Resistance [[ Ω]
1.0
Dropout Voltage [V]
100
0.8
0.6
0.4
0.35
0.30
0.25
0.2
0.0
0.20
0
100
200
300
Load Current [mA]
400
3.0
3.1
3.2
3.3
3.4
3.5
VAUX Input Voltage [V]
3.6
© 2004 California Micro Devices Corp. All rights reserved.
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430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214
▲ Fax: 408.263.7846
▲
www.calmicro.com
01/28/04
CM3103
Performance Information (cont’d)
CM3103 Transient Characteristics (nominal conditions unless specified otherwise)
(VCC source resistance set to 0.2Ω)
VCC Cold Start (Load = 400mA)
VCC Full Power Down (Load = 400mA)
VAUX Cold Start (Load = 400mA)
VAUX Full Power Down (Load = 400mA)
© 2004 California Micro Devices Corp. All rights reserved.
01/28/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
▲ Tel: 408.263.3214
▲
Fax: 408.263.7846
▲
www.calmicro.com
7
CM3103
Performance Information (cont’d)
CM3103 Transient Characteristics (cont’d; nominal conditions unless specified otherwise)
(VCC source resistance set to 0.2Ω)
VCC power up (VAUX = 3.3V, Load = 300mA)
VCC power down (VAUX = 3.3V, Load = 300mA)
Load Transient Response (10% - 90% rated)
Line Transient (1Vpp) Response
© 2004 California Micro Devices Corp. All rights reserved.
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430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214
▲ Fax: 408.263.7846
▲
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01/28/04
CM3103
Performance Information (cont’d)
CM3103 Typical Thermal Characteristics
and the second path is case to ambient (θ CA) thermal
resistance which is dependent on board layout. The
final operating junction temperature for any set of conditions can be estimated by the following thermal equation:
TJUNC = TAMB + PD (θ JC) + PD (θCA)
= TAMB + PD (θJA)
VOUT Variation with TAMB (400mA Load)
Regulator Output Voltage [V
The overall junction to ambient thermal resistance
(θJA) for device power dissipation (PD) consists primarily of two paths in series. The first path is the junction
to the case (θ JC) which is defined by the package style,
3.32
3.31
3.30
3.29
3.28
The CM3103 uses a thermally enhanced package
where all the GND pins (5 through 8) are integral to the
leadframe. When this package is mounted on a doublesided printed circuit board with two square inches of
copper allocated for "heat spreading", the resulting θ JA
is about 50°C/W.
TJUNC = TAMB + PD (θJA)
= 70°C + 0.7W X (50°C/W)
= 70°C + 35°C = 105°C
40
50
o
Temperature [ C]
60
70
4.55
Thermal characteristics were measured using a doublesided board with two square inches of copper area connected to the GND pin for "heat spreading".
4.50
Vselect
4.45
4.40
4.35
4.30
Vdeselect
4.25
4.20
25
Measurements showing performance up to junction
temperature of 125°C were performed under light load
conditions (5mA). This allows the ambient temperature
to be representative of the internal junction temperature.
50
75
100o
125
Temperature [ C]
150
VAUX Switch Resistance vs TAMB
0.37
0.35
On Resistance Ω
[ ]
Note: The use of multi-layer board construction with
separate ground and power planes will further enhance
the overall thermal performance. In the event of no
copper area being dedicated for heat spreading, a
multi-layer board construction, using only the minimum
size pad layout, will provide the CM3103 with an overall
θJA of 70°C/W which allows up to 780mW to be safely
dissipated for the maximum junction temperature.
30
Select/Deselect Threshold Variation with TJUNCT
Threshold Voltage [V]
Based on a typical operating power dissipation of 0.7W
(1.75V x 0.4A) with an ambient of 70°C, the resulting
junction temperature will be:
20
0.33
0.31
0.29
0.27
0.25
20
30
40
50o
Temperature [ C]
60
70
© 2004 California Micro Devices Corp. All rights reserved.
01/28/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
▲ Tel: 408.263.3214
▲
Fax: 408.263.7846
▲
www.calmicro.com
9
CM3103
Mechanical Details
SOIC-8 Mechanical Specifications
Dimensions for CM3103 devices packaged in 8-pin
SOIC packages are presented below.
Mechanical Package Diagrams
For complete information on the SOIC-8 package, see
the California Micro Devices SOIC Package Information document.
TOP VIEW
D
8
7
6
5
PACKAGE DIMENSIONS
Package
Pins
Dimensions
H
SOIC
Pin 1
Marking
E
8
Millimeters
Inches
Min
Max
Min
Max
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.004
0.010
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
1
2
3
4
SIDE VIEW
E
e
3.80
4.19
0.150
1.27 BSC
A
A1
SEATING
PLANE
B
0.165
e
0.050 BSC
H
5.80
6.20
0.228
0.244
L
0.40
1.27
0.016
0.050
# per tube
100 pieces*
# per tape
and reel
2500 pieces
Controlling dimension: inches
END VIEW
C
L
* This is an approximate number which may vary.
Package Dimensions for SOIC-8
© 2004 California Micro Devices Corp. All rights reserved.
10 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214
▲ Fax: 408.263.7846
▲
www.calmicro.com
01/28/04
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