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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 Thermal overload shutdown protection 8-pin SOIC package Lead-free version available
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. 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 (0.25 typ.) 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 supply to be dynamically switched without loss of output voltage. The CM3103 is available with optional lead-free finishing.
Applications
* * * * PCI adapter cards with Wake-On-LAN Network Interface Cards (NICs) Multiple power supply systems Systems with standby capabilities
Typical Application Circuit
Simplified Electrical Schematic
CM3103
VCC
VCC
5V
+ CIN
VAUX 3.3V 1F
VCC
VOUT
3.3V/400mA
+
Enable
VOUT
Vdeselect
VAUX GND
4.2V
AuxSw
Controller
3.3V
+
+ CEXT
10F
VAUX GND
AuxSw 0.25
-
Regulator Amp
VOUT
GND
(c) 2004 California Micro Devices Corp. All rights reserved. 01/28/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
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1
CM3103
PACKAGE / PINOUT DIAGRAM
TOP VIEW
N.C. VCC VOUT VAUX
1 2 3 4 8 7 6 5
GND GND GND GND
8-pin Power SOIC
Note: This drawing is not to scale.
PIN DESCRIPTIONS
PIN(S) 1 2 NAME N.C. 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 1F to 10F will ensure adequate filtering. Regulator output. 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. 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 . The negative reference for all voltages. Also functions as a thermal path for heat dissipation. DESCRIPTION
3
VOUT
4
VAUX
5-8
GND
Ordering Information
PART NUMBERING INFORMATION
Standard FInish Ordering Part Pins 8 Package Power SOIC Number1 CM3103-01SA Part Marking CM3103SA Lead-free Finish Ordering Part Number1 CM3103-01SF Part Marking CM3103SF
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
(c) 2004 California Micro Devices Corp. All rights reserved.
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430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
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CM3103
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER ESD Protection (HBM) Pin Input Voltages VCC VAUX Storage Temperature Range Operating Temperature Range Ambient Junction Power Dissipation (See Note 1) RATING +2000 [GND - 0.5] to +6.0 [GND - 0.5] to +4.0 -40 to +150 0 to +70 0 to +125 Internally Limited UNITS V V V C C C W
Note 1: At rated load, the power dissipation will be 0.68Watt (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.
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 F
(c) 2004 California Micro Devices Corp. All rights reserved. 01/28/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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CM3103
ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1)
SYMBOL VOUT ILIM IS/C VR LOAD VR LINE VCCSEL VCCDES VHYST RSW IRCC IRAUX ICC IAUX IGND PARAMETER Regulator Output Voltage Regulator Current Limit Short Circuit Current Load Regulation Line Regulation xx VCC Select Voltage VCC Deselect Voltage Hysteresis Voltage VAUX Switch Resistance VCC Reverse Leakage VAUX Reverse Leakage VCC Supply Current VAUX Supply Current Ground Current One supply input taken to GND while the others remain at nominal voltage. VCC > VCCSEL, ILOAD=0mA VAUX is selected, ILOAD=0mA VAUX is selected, (V CC/SBY = 0V) VCC/SBY = 5V, ILOAD = 0mA VCC/SBY = 5V, ILOAD = 400mA CONDITIONS 0mA < ILOAD < 400mA VOUT > 0V VCC=5V, VOUT < 0V VCC=5V, 5mA < ILOAD < 400mA ILOAD = 5mA; 4.5V < VIN < to 5.5V VAUX present VAUX present VAUX present; See Note 2 4.00 MIN 3.135 410 TYP 3.300 500 150 20 2 4.40 4.20 0.20 0.25 5 0.8 0.20 0.20 0.80 1.00 160 20 0.40 100 1.5 0.30 0.30 1.50 2.00 4.60 MAX 3.465 UNITS V mA mA mV mV V V V A mA mA mA mA mA C C
TDISABLE THYST
Shutdown Temperature Thermal Hysteresis
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.
(c) 2004 California Micro Devices Corp. All rights reserved.
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430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
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01/28/04
CM3103
Performance Information
CM3103 Typical DC Characteristics (nominal conditions unless specified otherwise)
VCC 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 1 2 3 4 VCC Input Voltage [V] 5 6
0.5
VAUX Supply Current vs. Voltage
Supply Current [mA]
Supply Current [mA]
0.4 0.3 0.2 0.1 0.0 0 1 2 3 VAUX Input Voltage [V] 4
Ground Current vs. Output Load
Line Regulation
3.4
1.2 1.1 1.0 0.9 0.8 0.7 0.6 0 100 200 300 Load Current [mA] 400
Regulator Output Voltage [V]
Ground Current [mA]
3.3
5mA
3.2 400mA
3.1
3.0 3.5 4 4.5 5 Line Voltage [V] 5.5 6
(c) 2004 California Micro Devices Corp. All rights reserved. 01/28/04
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CM3103
Performance Information (cont'd)
CM3103 Typical DC Characteristics (cont'd, nominal conditions unless specified otherwise)
Load Regulation (5V supply)
Foldback Current Limit Protection
Regulator Output Voltage [V]
Regulator Output Voltage [V]
3.45 3.40 3.35 3.30 3.25 3.20 3.15 0 100 200 300 400 Load Current [mA] 500
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 100 200 300 400 Output Current [mA] 500 600
Regulator Dropout Characteristics
1.2
Switch Resistance vs. VAUX supply
0.40
ON Resistance [ ] [
0 100 200 300 Load Current [mA] 400
1.0
Dropout Voltage [V]
0.35
0.8 0.6 0.4 0.2 0.0
0.30
0.25
0.20 3.0 3.1 3.2 3.3 3.4 3.5 VAUX Input Voltage [V] 3.6
(c) 2004 California Micro Devices Corp. All rights reserved.
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430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
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CM3103
Performance Information (cont'd)
CM3103 Transient Characteristics (nominal conditions unless specified otherwise) (VCC source resistance set to 0.2)
VCC Cold Start (Load = 400mA)
VCC Full Power Down (Load = 400mA)
VAUX Cold Start (Load = 400mA)
VAUX Full Power Down (Load = 400mA)
(c) 2004 California Micro Devices Corp. All rights reserved. 01/28/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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CM3103
Performance Information (cont'd)
CM3103 Transient Characteristics (cont'd; nominal conditions unless specified otherwise) (VCC source resistance set to 0.2)
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
(c) 2004 California Micro Devices Corp. All rights reserved.
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430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
L Fax: 408.263.7846
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CM3103
Performance Information (cont'd)
CM3103 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: TJUNC = TAMB + PD ( JC) + PD (CA) = TAMB + PD (JA) 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 JA is about 50C/W. Based on a typical operating 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 X (50C/W) = 70C + 35C = 105C Thermal characteristics were measured using a doublesided board with two square inches of copper area connected to the GND pin 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 multi-layer board construction, using only the minimum size pad layout, will provide the CM3103 with an overall JA of 70C/W which allows up to 780mW to be safely dissipated for the maximum junction temperature.
On Resistance ] [ Threshold Voltage [V]
VOUT Variation with TAMB (400mA Load)
Regulator Output Voltage [V
3.32
3.31
3.30
3.29
3.28 20 30 40 50 o Temperature [ C] 60 70
Select/Deselect Threshold Variation with TJUNCT
4.55 4.50 4.45 4.40 4.35 4.30 4.25 4.20 25 50 75 100 125 o Temperature [ C] 150 Vdeselect Vselect
VAUX Switch Resistance vs TAMB
0.37 0.35 0.33 0.31 0.29 0.27 0.25 20 30 40 50 o Temperature [ C] 60 70
(c) 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
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www.calmicro.com
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CM3103
Mechanical Details
SOIC-8 Mechanical Specifications Dimensions for CM3103 devices packaged in 8-pin SOIC packages are presented below. For complete information on the SOIC-8 package, see the California Micro Devices SOIC Package Information document. Mechanical Package Diagrams
TOP VIEW
D
8 7 6 5
PACKAGE DIMENSIONS
Package Pins Dimensions A A1 B C D E e H L # per tube # per tape and reel Millimeters Min 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40 Max 1.75 0.25 0.51 0.25 5.00 4.19 6.20 1.27 Min 0.053 0.004 0.013 0.007 0.189 0.150 0.228 0.016 SOIC 8 Inches Max 0.069 0.010
SIDE VIEW 1 2 3 4
H
Pin 1 Marking
E
0.020 0.010 0.197 0.165 0.244 0.050
C
END VIEW SEATING PLANE
A A1 B e
1.27 BSC
0.050 BSC
100 pieces* 2500 pieces Controlling dimension: inches
L
* This is an approximate number which may vary.
Package Dimensions for SOIC-8
(c) 2004 California Micro Devices Corp. All rights reserved.
10 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214
L Fax: 408.263.7846
L
www.calmicro.com
01/28/04

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