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CALIFORNIA MICRO DEVICES
CMPWR330
400mA SmartORTM Dual Regulator with VAUX Switch
Features
* Continuous 3.3V output from three inputs * Complete power management solution * V CC, VSBY regulator supplies 400mA output * Built-in hysteresis when selecting input supplies * Integrated switch has very low R DS(ON) 0.25 (TYP) * Foldback current limiting protection * Thermal overload shutdown protection * 8-pin power SOIC package
Applications
* PCI adapter cards with Wake-On-LAN * Network Interface Cards (NICs) * Multiple power systems * Systems with standby capabilities
Product Description
The CMPWR330 is a dual input regulator with a fully integrated VAUX switch capable of delivering up to 400mA continuously at 3.3V. The output power is provided from three independent input voltage sources on a prioritized basis. Power is always taken in priority using the following order VCC, VSBY, and VAUX. When VCC (5V) or VSBY is present, the device automatically enables the regulator and produces a stable 3.3V output at VOUT. When only VAUX (3.3V) 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.
PIN DIAGRAM AND ELECTRICAL SCHEMATIC
Top View VSBY VCC VOUT VAUX 1 2 3 4 8 7 6 5 GND GND GND GND
VCC 5V
+ -
VSBY 5V
+ -
1F CMPWR330 VSBY VCC 1F
+ -
GND
VOUT 3.3V 400mA
CMPWR330 8-Pin Power SOIC
VOUT VAUX GND VAUX 3.3V 10F GND
Pin Diagram
Typical Application Circuit
STANDARD PART ORDERING INFORMATION
Package Pins 8 Style Power SOIC Ordering Part Number Tubes Tape & Reel CMPWR330SA/T CMPWR330SA/R Part Marking CMPWR330SA
(c)2001 California Micro Devices Corp. All rights reserved. Smart ORTM is a trademark of California Micro Devices.
C1680101
215 Topaz Street, Milpitas, California 95035
3/6/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALIFORNIA MICRO DEVICES
ABSOLUTE MAXIMUM RATINGS
Parameter ESD Protection (HBM) VCC, VSBY Input Voltage VAUX Input Voltage Temperature: Storage Operating Ambient Operating Junction Power Dissipation: (Note 1) Rating 2000 6.0, GND -0.5 4.0, GND -0.5 -40 to 150 0 to 70 0 to 125 Internally Limited Unit V V V C C C W
CMPWR330
OPERATING CONDITIONS
Parameter VCC , VSBY VAUX Temperature (Ambient) Load Current CEXT Range 5 0.25 3.3 0.3 0 to 70 0 to 400 10 20% Unit V V C mA F
ELECTRICAL OPERATING CHARACTERISTICS
(over operating conditions unless specified otherwise) Symbol VOUT ILIM IS/C VR LOAD VR LINE VCCSEL VCCDES VHYST RSW IRCC IRSBY IRAUX ICC ISBY IAUX IGND Parameter Regulator Output Voltage Regulator Current Limit Short Circuit Current Load Regulation Line Regulation VCC Select Voltage VCC Deselect Voltage Hysteresis Voltage (Note 2) VAUX Switch Resistance VCC Reverse Leakage VSBY Reverse Leakage VAUX Reverse Leakage VCC Supply Current VSBY Supply Current VAUX Supply Current Ground Current One supply input taken to ground while the others remain at nominal voltage VCC > VCCSEL, ILOAD = 0mA VCC < VCCDES, ILOAD = 0mA VAUX is selected, ILOAD = 0mA VAUX is selected, (vCC/SBY = 0V) VCC/SBY = 5V, ILOAD = 0mA VCC/SBY = 5V, ILOAD = 400mA TDISABLE THYST Shutdown Temperature Thermal Hysteresis VCC/SBY = 5V, Vout = 0V VCC = 5V, ILOAD = 5 to 400mA VCC = 4.5V to 5.5V, ILOAD = 5mA VSBY or VAUX present VSBY or VAUX present VSBY or VAUX present 4.00 Conditions 0mA < ILOAD < 400mA MIN 3.135 TYP 3.30 500 150 20 2 4.40 4.20 0.20 0.25 5 0.4 100 4.60 MAX 3.465 UNIT V mA mA mV mV V V V A
0.8 0.8 0.2 0.2 0.8 1.0 160 20
1.5 1.5 0.30 0.30 1.5 2.0
mA mA mA mA mA mA C C
Note 1: At rated load, the power dissipation will be 0.68W (1.7V x 0.4A). Under these conditions, (in a 70C ambient), the thermal resistance from junction to ambient (JA) must not exceed 80C/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. 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 VCC supply should be kept to less than 0.3 to ensure precise switching.
(c)2001 California Micro Devices Corp. All rights reserved. Smart ORTM is a trademark of California Micro Devices.
2
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3/6/2001
CALIFORNIA MICRO DEVICES
Interface Signals
VCC is a 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 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 1F to 10F will ensure adequate filtering. VSBY is the standby input supply (5V), which is immediately used to power the regulator output whenever VCC is below the deselect level (4.2V).
CMPWR330
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 1F to 10F will ensure adequate filtering. VAUX is the auxiliary voltage power source. This supply is selected only when VCC falls below 4.2V and the VSBY is not present. Under these conditions an internal switch is enabled and provides a very low impedance connection directly between VOUT and VAUX. VOUT is the output voltage. Power is provided from the regulator or via the low impedance auxiliary switch. This output requires a capacitance of 10F to ensure regulator stability and minimize the peak output disturbance during power supply changeover. GND provides the reference for all voltages.
INTERFACE SIGNALS
Pin 1 2 3 4 5-8 Symbol VSYB VCC VOUT VAUX GND Description Standby supply voltage (5V) input for regulator whenever VCC falls below 4.2V. Primary supply voltage (5V) input for regulator Regulator voltage output (3.3V) regulator when either VCC or VSYB is present Auxiliary supply voltage (3.3V) input for low impedance switch Reference for all voltages
5VSBY 5VCC CONTROLLER
+ + -
SELECT (VCC /V SBY) ENABLE
AUXSW VDESELECT 4.2V 3.3VAUX GND AUXSW 0.25 VREF 3.3V
+ -
VCC VSBY VOUT 3.3V 400mA
REGULATOR AMP
GND
Simplified Electrical Schematic
(c)2001 California Micro Devices Corp. All rights reserved. Smart ORTM is a trademark of California Micro Devices.
215 Topaz Street, Milpitas, California 95035
3/6/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3
CALIFORNIA MICRO DEVICES
Typical DC Characteristics (nominal conditions unless specified otherwise)
CMPWR330
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 1 2 3 4 5 6 VCC Input Voltage (V)
Supply Current (mA) Supply Current (mA)
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 1 2 3 4 5 6 VSBY Input Voltage (V)
Figure 1. VCC Supply Current vs Voltage
0.5
Figure 2. VSBY Supply Current vs Voltage
1.2 1.1
Ground Current (mA)
0.4
Supply Current (mA)
1.0 0.9 0.8 0.7 0.6 0 100 200 Load Current (mA) 300 400
0.3
0.2
0.1
0.0 0 1 2 VAUX Input Voltage (V) 3 4
Figure 3. VAUX Supply Current vs Voltage
Figure 4. Ground Current vs Output Load
3.4
3.4
Regulator Output Voltage (V)
Regulator Output Voltage (V)
3.3
3.3
3.2
3.2
3.1
3.1
3.0 3.5
4
4.5
5
5.5
6
3.0 3.5
4
4.5
5
5.5
6
Line Voltage (V)
Line Voltage (V)
Figure 5. Line Regulation (5mA Load)
(c)2001 California Micro Devices Corp. All rights reserved. Smart ORTM is a trademark of California Micro Devices.
Figure 6. Line Regulation (400mA Load)
Fax: (408) 263-7846 www.calmicro.com
3/6/2001
4
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
CALIFORNIA MICRO DEVICES
Typical DC Characteristics
CMPWR330
3.45
Regulator Output Voltage (V) Regulator Output Voltage (V)
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 100 200 300 400 500 600
3.40 3.35 3.30 3.25 3.20 3.15 0 100 200 300 400 500 600 Load Current (mA)
Output Current (mA)
Figure 7. Load Regulation (5V Supply)
Figure 8. Foldback Current Limit Protection
1.2 1.0
0.40
Dropout Voltage (V)
0.8 0.6 0.4 0.2 0.0 0 100 200 Load Current (mA) 300 400
ON Resisitance ()
0.35
0.30
0.25
0.20 3.0
3.1
3.2
3.3
3.4
3.5
3.6
VAUX INPUT VOLTAGE (V)
Figure 9. Regulator Dropout Characteristics
Figure 10. Switch Resistance vs VAUX Supply
(c)2001 California Micro Devices Corp. All rights reserved. Smart ORTM is a trademark of California Micro Devices.
215 Topaz Street, Milpitas, California 95035
3/6/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
5
CALIFORNIA MICRO DEVICES
Typical Transient Characteristics (Supply source resistance set to 0.2)
CMPWR330
Tek Run: 25kS/s
Sample
Tek
25kS/s
1 Acqs
VCC
VCC VOUT
VOUT
Ch1
1V
1V
M 2ms Ch2
4.48V
Ch1
1V
1V
M 2ms Ch2
1.44V
Figure 11. VCC Cold Start (Load = 400mA)
Tek Run: 25kS/s Sample
Figure 12. VCC Full Power Down (Load = 400mA)
Tek Run: 25kS/s Sample
VSBY
VSYB VOUT
VOUT
Ch1
1V
1V
M 2ms Ch1
1.02V
Ch1
1V
1V
M 2ms Ch2
3.56V
Figure 13. VSBY Cold Start (Load = 400mA)
Tek Run: 25kS/s Sample
Figure 14. VSBY Full Power Down (Load = 400mA)
Tek Run: 25kS/s Sample
VAUX
VAUX
VOUT
VOUT
1
1
Ch1
1V
1V
M 2ms Ch1
1.26V
Ch1
1V
1V
M 2ms Ch1
2.60V
Figure 15. VAUX Cold Start (Load = 400mA)
215 Topaz Street, Milpitas, California 95035
Figure 16. VAUX Full Power Down (Load = 400mA)
Fax: (408) 263-7846 www.calmicro.com
3/6/2001
(c)2001 California Micro Devices Corp. All rights reserved. Smart ORTM is a trademark of California Micro Devices.
6
Tel: (408) 263-3214
CALIFORNIA MICRO DEVICES
Typical Transient Characteristics (VCC source resistance set to 0.2)
Tek Run: 2.5MS/s Sample VSBY (offset = 5V) 3
CMPWR330
Tek Run: 2.5MS/s Sample
3 VSBY (offset = 5V)
VCC (offset = 4.5V)
VCC (offset = 4.5V)
1 VOUT (offset = 3.3V)
1 VOUT (offset = 3.3V)
Ch1 100mV Ch3 100mV
100mV M 20s Ch2
4.46V
Ch1 100mV Ch3 100mV
100mV M 20s Ch2
4.32V
Figure 17. VCC Power Up (VSBY = 5V, Load = 300mA)
Tek Run: 2.5MS/s Sample
Figure 18. VCC Power Down (VSBY = 5V, Load = 300mA)
Tek Run: 2.5MS/s Sample
VCC (offset = 4.5V)
2
VCC (offset = 4.5V)
1 VOUT (offset = 3.3V) VOUT (offset = 3.3V)
Ch1 100mV
100mV M 20s Ch2
4.44V
Ch1 100mV
100mV M 20s Ch2
4.31V
Figure 19. VCC Power Up (VAUX = 3.3V, Load = 300mA)
Tek 10MS/s 2 Acqs
Figure 20. VCC Power Down (VAUX = 3.3V, Load = 300mA)
Tek Run: 500kS/s Sample
5.5V Load 360mA 2 40mA 4.5V VOUT (offset = 3.3V) 1 VCC
VOUT (offset = 3.3V) (5mA Load) Ch1 50mV 2V M 5s Ch3 3.50V 20mV Ch2 500mV M 100s Ch2 5V
Figure 21. Load Transient Response (10% - 90% Rated)
(c)2001 California Micro Devices Corp. All rights reserved. Smart ORTM is a trademark of California Micro Devices.
Figure 22. Line Transient (1Vpp) Response
Fax: (408) 263-7846 www.calmicro.com
215 Topaz Street, Milpitas, California 95035
3/6/2001
Tel: (408) 263-3214
7
CALIFORNIA MICRO DEVICES
Typical Thermal Characteristics
Regulator Output Voltage (V)
3.32
CMPWR330
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: TJUNC = TAMB + PD (JC ) + PD (CA ) = TAMB + PD (JA) The CMPWR330 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 double sided printed circuit board with two square inches of copper allocated for "heat spreading", the resulting JA is 50C/W. Based on a maximum power dissipation of 0.7W (1.75V x 0.4A) with an ambient of 70C the resulting junction temperature will be: TJUNC = TAMB + PD (JA ) = 70C + 0.7W (50C/W) = 70C + 35C = 105C Thermal characteristics were measured using a double sided board with two square inches of copper area connected to the GND pins for "heat spreading". Measurements showing performance up to junction temperature of 125C were performed under light load conditions (5mA). 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 multilayer board construction, using only the minimum size pad layout, will typically provide the CMPWR330 with an overall JA of 70C/W which allows up to 780mW to be safely dissipated.
3.31
3.30
3.29
3.28 20
30
40
50
60
70
Temperature (C)
Figure 23. VOUT Variation with TAMB (400mA Load)T
4.55 4.50
Threshold Voltage (V)
VSELECT
4.45 4.40 4.35 4.30 4.25 4.20 25 50 75 100 125 150 VDESELECT
Temperature (C) Figure 24. Select/Deselect Threshold Variation with TJUNC
0.37 0.35
ON Resistance ()
0.33 0.31 0.29 0.27 0.25 20
30
40
50
60
70
Temperature (C)
Figure 25. VAUX Switch Resistance vs TAMB
(c)2001 California Micro Devices Corp. All rights reserved. Smart ORTM is a trademark of California Micro Devices.
8
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3/6/2001

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