400mA SmartORTM Regulator with VAUX Switch CMPWR330 Features 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 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. • • • • Continuous 3.3V output from three inputs Complete power management solution VCC, VSBY regulator supplies 400mA output Built-in hysteresis when selecting input supplies Integrated switch has very low RDS(ON) resistance of 0.25Ω (TYP) Foldback current limiting protection Thermal overload shutdown protection 8-pin power SOIC package RoHS compliant (lead-free) finishing Applications • • • • PCI adapter cards with Wake-On-LAN Network Interface Cards (NICs) Multiple power systems Systems with standby capabilities 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 (0.25Ω 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 leadfree finishing. ©2010 SCILLC. All rights reserved. June 2010 Rev. 3 Publication Order Number: CMPWR330/D CMPWR330 Typical Application Circuit Simplified Electrical Schematic PIN DESCRIPTIONS PIN(S) NAME DESCRIPTION 1 VSBY VSBY is the standby input supply (5V), which is used to power the regulator whenever VCC is below the deselect level (4.2V). 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 1µF to 10µF will ensure adequate filtering. 2 VCC VCC is a positive input supply for the voltage regulator. Whenever this supply voltage exceeds the VCCSEL level (4.4V), it will 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 0.3Ω 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 VOUT is the output voltage. 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 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 VAUX and VOUT. 5-8 GND The negative reference for all voltages. Also functions as a thermal path for heat dissipation. Rev. 3 | Page 2 of 13 | www.onsemi.com CMPWR330 VSBY VCC VOUT VAU X 1 8 2 7 3 6 4 5 GND GND GND GND 8-pin Power SOIC Ordering Information PART NUMBERING INFORMATION Pins Package Ordering Part Number1 Part Marking 8 Power SOIC CMPWR330SF CMPWR330SF Note 1: Parts are shipped in Tape & Reel form unless otherwise specified. Rev. 3 | Page 3 of 13 | www.onsemi.com CMPWR330 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, VSBY VAUX Storage Temperature Range Note 1: At rated load, the power dissipation will be 0.68W (1.7V x 0.4A). Under these conditions, (in a 70°C ambient), the thermal resistance from junction to ambient (θJA) 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 PARAMETER VALUE 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% μF Rev. 3 | Page 4 of 13 | www.onsemi.com CMPWR330 ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL PARAMETER CONDITIONS Regulator Output Voltage 0mA < ILOAD < 400mA ILIM Regulator Current Limit IS/C VOUT MIN TYP MAX UNITS 3.135 3.300 3.465 V VOUT > 1V 500 mA Short Circuit Current VCC/SBY = 5V, VOUT = 0V 150 mA VR LOAD Load Regulation VCC = 5V, 5mA < ILOAD < 400mA 20 mV VR LINE Line Regulation xx 2 mV VCCSEL VCC Select Voltage VCCDES VCC Deselect Voltage VHYST Hysteresis Voltage 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 ILOAD = 5mA; 4.5V < VIN < to 5.5V 4.40 VSBY or VAUX present VSBY or VAUX present VSBY or VAUX present; See Note 2 4.00 4.60 V 4.20 V 0.20 V 0.25 0.40 Ω 5 100 μA VCC > VCCSEL, ILOAD = 0mA 0.8 1.5 mA VSBY Supply Current VCC < VCCSEL, ILOAD = 0mA 0.8 1.5 mA IAUX VAUX Supply Current VAUX is selected, ILOAD = 0mA 0.20 0.30 mA IGND Ground Current VAUX is selected, (VCC/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 TDISABLE THYST 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 VCC supply should be kept to less than 0.3 ohms to ensure precise switching. Rev. 3 | Page 5 of 13 | www.onsemi.com CMPWR330 Performance Information CMPWR330 Typical DC Characteristics (nominal conditions unless specified otherwise) Rev. 3 | Page 6 of 13 | www.onsemi.com CMPWR330 Performance Information (cont’d) CMPWR330 Typical DC Characteristics (cont’d, nominal conditions unless specified otherwise) Rev. 3 | Page 7 of 13 | www.onsemi.com CMPWR330 Performance Information (cont’d) CMPWR330 Transient Characteristics (nominal conditions unless specified otherwise) (VCC source resistance set to 0.2Ω) Rev. 3 | Page 8 of 13 | www.onsemi.com CMPWR330 CMPWR330 Transient Characteristics (cont’d; nominal conditions unless specified otherwise) (VCC source resistance set to 0.2Ω) Rev. 3 | Page 9 of 13 | www.onsemi.com CMPWR330 Performance Information (cont’d) CMPWR330 Typical Thermal Characteristics 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 (θJC) which is defined by the package style, and the second path is case to ambient (qCA) 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: TJ = TA + (PD)(θJC) + (PD)(θCA) = TA + (PD)(θJA) 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 θJA is about 50°C/W. 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: TJ = TA + (PD)(θJA) = 70°C + 0.7W X (50°C/W) = 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 (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 provide the CMPWR330 with an overall qJA of 70°C/W which allows up to 780mW to be safely dissipated for the maximum junction temperature. Rev. 3 | Page 10 of 13 | www.onsemi.com CMPWR330 Rev. 3 | Page 11 of 13 | www.onsemi.com CMPWR330 Mechanical Details SOIC-8 Mechanical Specifications Dimensions for CMPWR330 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. PACKAGE DIMENSIONS Package SOIC Pins 8 Millimeters Inches Dimensions 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 E 3.80 4.19 0.150 0.165 e 1.27 BSC 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 Package Dimensions for SOIC-8 * This is an approximate number which may vary. Rev. 3 | Page 12 of 13 | www.onsemi.com CMPWR330 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 LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: [email protected] N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 Rev. 3 | Page 13 of 13 | www.onsemi.com ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative