400mA SmartOR¿ Regulator with V AUX Switch

CMPWR330
400 mA SmartORt Regulator
with VAUX Switch
Product Description
The CMPWR330 is a dual input regulator with a fully integrated
VAUX switch capable of delivering up to 400 mA continuously at
3.3 V. The input is taken from three independent voltage sources on
a prioritized basis. Power is always taken in priority using the order of
VCC, VSBY, and VAUX.
When VCC, (5 V) or VSBY is present, the device automatically
enables the regulator and produces a stable 3.3 V output at VOUT.
When only VAUX (3.3 V) is present, the device provides a low
impedance direct connection (0.25 TYP.) from VAUX to VOUT.
All the necessary control circuitry needed to provide a smooth and
automatic transition between all three supplies has been incorporated.
This allows the VCC input supply to be dynamically switched without
loss of output voltage.
The CMPWR330 is housed in an 8−pin SOIC package and is
available with RoHS compliant lead−free finishing.
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SIOC 8
SF SUFFIX
CASE 751BD
MARKING DIAGRAM
CMPWR330SF
Features
•
•
•
•
•
•
•
•
•
Continuous 3.3 V Output from Three Inputs
Complete Power Management Solution
VCC, VSBY Regulator Supplies 400 mA Output
Built−In Hysteresis when Selecting Input Supplies
Integrated Switch Has Very Low RDS(ON) Resistance of 0.25 (TYP)
Foldback Current Limiting Protection
Thermal Overload Shutdown Protection
8−Pin Power SOIC Package
These Devices are Pb−Free and are RoHS Compliant
Applications
•
•
•
•
CMPWR330SF = Specific Device Code
ORDERING INFORMATION
Device
Package
Shipping†
CMPWR330SF
Power SOIC
(Pb−Free)
750/Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
PCI Adapter Cards with Wake−On−LAN
Network Interface Cards (NICs)
Multiple Power Systems
Systems with Standby Capabilities
© Semiconductor Components Industries, LLC, 2011
April, 2011 − Rev. 4
1
Publication Order Number:
CMPWR330/D
CMPWR330
TYPICAL APPLICATION CIRCUIT
5V
VSBY
CMPWR330
+
1 F
VSBY
GND
5V
VCC
VOUT
VCC
+
1 F
+
−
3.3 V/400 mA
VOUT
+ CEXT
VAUX
10 F
GND
VAUX
3.3 V
GND
SIMPLIFIED ELECTRICAL SCHEMATIC
VSBY
VCC
Controller
SELECT (VCC/VSBY)
+
ENABLE
-
VCC
AUXSW
VDeselect
4.1 V
+
AUXSW
0.25 VREF
3.3 V
VSBY
-
Regulator Amp
VOUT
3.3 V
400 mV
VAUX
GND
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CMPWR330
PACKAGE / PINOUT DIAGRAM
Top View
VSBY
1
8
GND
VCC
2
7
GND
VOUT
3
6
GND
VAUX
4
5
GND
8−Pin Power SOIC
Table 1. PIN DESCRIPTIONS
Pin(s)
Name
Description
1
VSBY
VSBY is the standby input supply (5 V), which is used to power the regulator whenever VCC is below the
deselect level (4.2 V). If the VSBY connection 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 1 F to 10 F will ensure
adequate filtering.
2
VCC
VCC is a positive input supply for the voltage regulator. Whenever this supply voltage exceeds the VCCSEL
level (4.4 V), it will be given priority and be used to power the regulator output. If this supply voltage falls
below the VCCDES level (4.2 V) it will immediately be deselected and no longer provide power for the regulator
output. An internal hysteresis voltage of 0.2 V is used to prevent any chatter during selection and deselection
of VCC. The effective source impedance of VCC should be kept below 0.3 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 1 F to 10 F will ensure adequate filtering.
3
VOUT
VOUT is the output voltage. Power is provided from the regulator or via the low impedance auxiliary switch.
This output requires a capacitance of 10 F to ensure regulator stability and minimize the peak output
disturbance during power supply changeover.
4
VAUX
VAUX is the auxiliary voltage power source. This supply is selected only when VCC falls below 4.2 V and the
VSBY is not present. Under these conditions an internal switch is enabled and provides a very low impedance
connection directly between VAUX and VOUT.
5−8
GND
The negative reference for all voltages. Also functions as a thermal path for heat dissipation.
SPECIFICATIONS
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
ESD Protection (HBM)
Pin Input Voltages
VCC, VSBY
VAUX
Rating
Units
±2000
V
[GND − 0.5] to +6.0
[GND − 0.5] to +4.0
Storage Temperature Range
−40 to +150
Operating Temperature Range
Ambient
Junction
0 to +70
0 to +125
Power Dissipation (Note 1)
Internally Limited
V
°C
°C
W
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. At rated load, the power dissipation will be 0.68 W (1.7 V x 0.4 A). Under these conditions, (in a 70°C ambient), the thermal resistance from
junction to ambient (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.
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CMPWR330
SPECIFICATIONS (Cont’d)
Table 3. STANDARD OPERATING CONDITIONS
Parameter
Rating
Units
VCC, VSBY
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%
F
Table 4. ELECTRICAL OPERATING CHARACTERISTICS (Note 1)
Symbol
VOUT
Parameter
Conditions
Min
Typ
Max
Units
3.135
3.300
3.465
V
Regulator Output Voltage
0 mA < ILOAD < 400 mA
ILIM
Regulator Current Limit
VOUT > 1 V
500
mA
IS/C
Short Circuit Current
VCC/SBY = 5 V, VOUT = 0 V
150
mA
VR LOAD
Load Regulation
VCC = 5 V, 5 mA ≤ ILOAD ≤ 400 mA
20
mV
VR LINE
Line Regulation xx
ILOAD = 5 mA, 4.5 V ≤ VIN ≤ to 5.5 V
2
mV
VCCSEL
VCC Select Voltage
VSBY or VAUX Present
VCCDES
VCC Deselect Voltage
VSBY or VAUX Present
Hysteresis Voltage
VSBY or VAUX Present (Note 2)
VHYST
RSW
VAUX Switch Resistance
IRCC
IRSBY
IRAUX
VCC Reverse Leakage
VSBY Reverse Leakage
VAUX Reverse Leakage
One supply input taken to GND while the
others remain at nominal voltage.
ICC
VCC Supply Current
ISBY
4.40
4.00
4.60
V
4.20
V
0.20
V
0.25
0.40
5
100
A
VCC > VCCSEL, ILOAD = 0 mA
0.8
1.5
mA
VSBY Supply Current
VCC < VCCSEL, ILOAD = 0 mA
0.8
1.5
mA
IAUX
VAUX Supply Current
VAUX is Selected, ILOAD = 0 mA
0.20
0.30
mA
IGND
Ground Current
VAUX is Selected, (VCC/SBY = 0 V)
VCC/SBY = 5 V, ILOAD = 0 mA
VCC/SBY = 5 V, ILOAD = 400 mA
0.20
0.80
1.00
0.30
1.50
2.00
mA
TDISABLE
THYST
Shutdown Temperature
Thermal Hysteresis
160
20
°C
1. Operating characteristics are over Standard Operating Conditions unless otherwise specified.
2. The disturbance on VCC during supply changeover should be kept below the hysteresis voltage to prevent any chatter. The source resistance
on the VCC supply should be kept to less than 0.3 to ensure precise switching.
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CMPWR330
PERFORMANCE INFORMATION
CMPWR330 Typical DC Characteristics (nominal conditions unless specified otherwise)
Figure 1. VCC Supply Current vs. Voltage
Figure 2. VSBY Supply Current vs. Voltage
Figure 3. VAUX Supply Current vs. Voltage
Figure 4. Ground Current vs. Output Load
Figure 5. ??????????
Figure 6. ??????????
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CMPWR330
PERFORMANCE INFORMATION (Cont’d)
CMPWR330 Typical DC Characteristics (cont’d, nominal conditions unless specified otherwise)
Figure 7. Load Regulation (5 V Supply)
Figure 8. Foldback Current Limit Protection
Figure 9. Regulation Dropout Characteristics
Figure 10. Switch Resistance vs. VAUX Supply
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CMPWR330
PERFORMANCE INFORMATION (Cont’d)
CMPWR330 Transient Characteristics (nominal conditions unless specified otherwise)
(VCC source resistance set to 0.2 )
Figure 11. VCC Cold Start (Load = 400 mA)
Figure 12. VCC Full Power Down (Load = 400 mA)
Figure 13. VSBY Cold Start (Load = 400 mA)
Figure 14. VSBY Full Power Down (Load = 400 mA)
Figure 15. VAUX Cold Start (Load = 400 mA)
Figure 16. VAUX Full Power Down (Load = 400 mA)
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CMPWR330
PERFORMANCE INFORMATION (Cont’d)
CMPWR330 Transient Characteristics (cont’d; nominal conditions unless specified otherwise)
(VCC source resistance set to 0.2 )
Figure 17. VCC Power Up
(VSBY = 5 V, Load = 300 mA)
Figure 18. VCC Power Down
(VSBY = 5 V, Load = 300 mA)
Figure 19. VCC Power Up
(VAUX = 3.3 V, Load = 300 mA)
Figure 20. VCC Power Down
(VAUX = 3.3 V, Load = 300 mA)
Figure 21. Load Transient Response
(10% − 90% Rated)
Figure 22. Line Transient (1 VPP) Response
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CMPWR330
PERFORMANCE INFORMATION (Cont’d)
CMPWR330 Typical Thermal Characteristics
The overall junction to ambient thermal resistance (JA)
for device power dissipation (PD) consists primarily of two
paths in series. The first path is the junction to the case (JC)
which is defined by the package style, and the second path
is case to ambient (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:
T J + T A ) (P D)(q JC) ) (P D)(q CA)
+ T A ) (P D)(q JA)
The CMPWR330 uses a thermally enhanced package
where all the GND leads (pins 5 through 8) are integral to the
leadframe. When this package is mounted on a double−sided
printed circuit board with two square inches of copper
allocated for “heat spreading”, the resulting JA is about
50°C/W.
Based on a typical operating power dissipation of 0.7 W
(1.75 V x 0.4 A) with an ambient of 70°C, the resulting
junction temperature will be:
Figure 23. VOUT Variation with TAMB(400 mA Load)T
T J + T A ) (P D)(q JA)
+ 70° C ) 0.7W (50° CńW)
+ 70° C ) 35° C + 105° C
The thermal characteristics were measured using
a double−sided board with two square inches of copper area
connected to the GND pin for “heat spreading”.
Measurements showing performance up to junction
temperature of 125°C were performed under light load
conditions (5 mA). This allows the ambient temperature to
be representative of the internal junction temperature.
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 CMPWR330 with an overall JA of
70°C/W which allows up to 780 mW to be
safely dissipated for the maximum junction
temperature.
Figure 24. Select/Deselect Threshold
Variation with TJUNC
Figure 25. VAUX Switch Resistance vs. TAMB
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CMPWR330
PACKAGE DIMENSIONS
SOIC 8, 150 mils
CASE 751BD−01
ISSUE O
E1
E
SYMBOL
MIN
A
1.35
1.75
A1
0.10
0.25
b
0.33
0.51
c
0.19
0.25
D
4.80
5.00
E
5.80
6.20
E1
3.80
4.00
MAX
1.27 BSC
e
PIN # 1
IDENTIFICATION
NOM
h
0.25
0.50
L
0.40
1.27
θ
0º
8º
TOP VIEW
D
h
A1
θ
A
c
e
b
L
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-012.
SmartOR is a trademark of Semiconductor Components Industries, LLC (SCILLC).
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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Sales Representative
CMPWR330/D
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