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. 2 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214 ▲ Fax: 408.263.7846 ▲ www.calmicro.com 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 ▲ www.calmicro.com 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. 6 430 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. 8 430 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 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