CMPWR300 CALIFORNIA MICRO DEVICES 500mA SmartORTM DUAL REGULATOR WITH VAUX SWITCH Features 8-pin Power SOIC package Continuous 3.3V output from three inputs Complete Power Management solution VCC, VSBY Regulator supplies 500mA output Built-in hysteresis when selecting input supplies Integrated switch has very low RDS(ON) 0.12Ω (typ.) Large Bypass Capacitors on inputs not required Pin Diagram Applications PCI adapter cards with Wake-On-LAN Network Interface Cards (NICs) Multiple Power Systems Systems with Standby Capabilities Product Description The CMPWR300 is a dual input regulator with VAUX switch capable of delivering 3.3V/500mA continuously. 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. Typical Application Circuit 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 (0.12Ω 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 both VCC and VSBY to be dynamically switched without loss of output voltage. Pins 8 Simplified Electrical Schematic STANDARD PART ORDE RING INFORMATION Package Ordering Part Number Style Part Marking SOIC Power CMPWR300SA When placing an order please specify desired shipping: Tubes or Tape & Reel. C0621199 © 2000 Calirornia Micro Devices Corp. All rights reserved. CMPWR300 is a trademark of California Micro Devices Corp. 12/5/2000 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 1 CMPWR300 CALIFORNIA MICRO DEVICES ABSOLUTE MAXIMUM RATINGS Param e te r R ating Unit 2000 V V CC V SBY Input Voltage +6.0, Gnd -0.5 V V AUX Input Voltage +4.0, Gnd -0.5 V ESD Protection (HBM) Storage Temperature Range -40 to +150 Operating Ambient 0 to +70 Operating Junction 0 to +125 Power Dissipation: Note 1 oC 1.0 W OPERATING CONDITIONS Param e te r R ange Unit V CC, V SBY 5.0 ± 0.25 V V AU X 3.3 ± 0.3 V Temperature (Ambient) 0 to +70 oC Load Current 0 to 500 mA 10 ± 10% mF C EXT ELECTRICAL OPERATING CHARACTERISTICS (over operating conditions unless specified other wise) Symbol Parameter Conditions V OUT I OUT VR LOAD VR LINE V CCSEL V CCDES V SBYSEL V SBYDES V HYST RSW R e g u l a t o r O u t p u t Vo l t a g e R e g u l a t o r Ou t p u t C u r r e n t Load Regulation Line Regulation V CC S e l e c t Vo l ta g e V CC D e s e l e c t Vo l ta g e V SBY S e l e c t Vo l ta g e V SBY D e s e l e c t Vo l ta g e Hysteresis Voltage: Note 2 500mA > ILOAD>0mA Auxiliary Switch Resistance IS/C IRCC IRSBY S h o rt Ci rc u i t Cu rre n t VCC Pin Reverse Leakage IRAUX ICC ISBY MIN TYP MAX UNIT 3.135 50 0 3.30 800 20 2 4.50 4.20 4.50 4.20 0.30 3.465 V mA mV mV VCC/SBY are deselected 0.12 0.2 VCC/SBY = 5V, VOUT = 0V One supply input taken to ground 2000 VSBY Pin Reverse Leakage while the others remain at normal 5 50 VAUX Pin Reverse Leakage VCC Supply Current (when VCC is not present) voltage VCC > VCCSEL, ILOAD = 0mA VCCDES > VCC > VOUT VOUT > VCC V SBY > VSBYSEL, ILOAD = 0mA V SBYDES > VSBY > VOUT VOUT > VSBY V CC or VSBY > VOUT V CC and VSBY < V OUT Both VCC and VSBY are delection VCC /SBY = 5V, ILOAD = 0mA VCC /SBY = 5V, ILOAD = 500mA 1.0 0.15 0.01 1.0 0.15 0.01 0.05 0.2 0.15 1.0 1.2 3.0 0.25 0.02 3.0 0.25 0.02 0.1 0.4 0.30 3.0 3.5 VSBY Supply Current (when VCC is not present) IAUX VAUX Supply Current IGND Ground Current: Note 3 Note 1: Note 2: Note 3: VCC = 5V, ILOAD = 50mA to 500mA VCC = 4.5V to 5.5V, ILOAD = 5mA V SBY > V SBYDES or V AUX present V CC < V CCDES V AUX present Applies to VCC and VSBY selection 3.90 3.90 4.60 V 4.60 Ω mA µA mA mA mA mA The thermal resistance from junction to ambient (θJA) must be less than 55° 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. The hysteresis defines the maximum level of acceptable disturbance on VCC during switching. Ground current consists of controller current and regulator current if enabled. ©2000 California Micro Devices Corp. All rights reserved. 2 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 12/5/2000 CMPWR300 CALIFORNIA MICRO DEVICES Interface Signals VCC is the primary power source which is given priority when present. If this 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. VAUX is the auxiliary low voltage power source. This supply is only used when neither the VCC nor VSBY is available. Under these conditions an internal switch is enabled and provides a very low impedance connection directly between VOUT and VAUX. The voltage level on VCC is compared to an internal threshold voltage to determine which power source is to be selected. In order to prevent regulator dropout from occurring, the threshold has been programmed to ensure VCC is deselected prior to dropout, which prevents loss of output regulation when switching between VCC and VSBY. Typically the threshold is set to 4.2V. Once VCC falls below this level, the output voltage is immediately derived from the auxiliary power source. To prevent chatter during this transition, the threshold has a built-in hysteresis of 300mV which results in only VCC being selected once the voltage level exceeds 4.50V (typically). 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. GND provides the reference for all voltages. VSBY is the standby 5V supply power source, which is given priority when VCC is not present. The internal regulator will remain enabled until such time that VSBY falls below the disable threshold level (4.2V typically). 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. INTERFACE SIGNALS Pin 1 2 3 4 5 -8 Symbol VSBY VCC VOUT VAUX GN D D escription Standby supply voltage (5V) input for regulator when VCC falls below 4.2V. Primary supply voltage (5V) input for regulator. Regulator voltage output (3.3V) regulator when either VCC or VSBY is present. Auxiliary supply voltage (3.3V) input for low impedence switch. Reference for all voltages. © 2000 Calirornia Micro Devices Corp. All rights reserved. 12/5/2000 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 3 CMPWR300 CALIFORNIA MICRO DEVICES Typical DC Characteristics Unless stated otherwise, all DC characteristics were measured at room temperature with a nominal VCC supply voltage of 5.0 volts and an output capacitance of 10µF. In normal operation the regulator is deselected at 4.2V, which ensures a regulation output drop of less than 100mV is maintained. Fig 1.1. Line Regulation 3.35 100mA load 3.30 3.25 Vout [V] Fig 1.1. Line regulation of the regulator is shown here. At maximum rated load conditions (500mA), a 100mV drop in regulation occurs when the line voltage falls below 3.8V. For light load conditions (100mA), regulation is maintained for line voltages as low as 3.5V. 500mA load 3.20 3.15 3.10 3.05 3.0 3.5 4.0 4.5 5.0 Vcc [V] Fig 1.2. Load Regulation (pulse condition) 3.36 3.34 3.32 Vout [V] Fig 1.2. Load regulation (pulse condition) performance is shown up to and beyond the rated load. A change in load from 10% to 100% of rated (50mA to 500mA) results in an output voltage change of about 20mV. This translates into an effective output impedance of less than 50mΩ. 3.30 3.28 3.26 3.24 0 200 400 600 800 Load Current [mA] Fig 1.3. Vaux Switch Resistance vs. Vaux 200 180 Resistance [mOhm] Fig 1.3. VAUX Switch Resistance is shown across a broad range of VAUX supply level. From 2.7V and 3.6V, it only varies from about 130mΩ down to 110mΩ. 160 140 120 100 80 60 2.7 3 3.3 3.6 Vaux [V] ©2000 California Micro Devices Corp. All rights reserved. 4 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 12/5/2000 CMPWR300 CALIFORNIA MICRO DEVICES Fig 1.4. Ground Current 2.0 1.5 IGND [mA] Fig 1.4. Ground Current is shown across the entire range of load conditions. The ground current has minimal variation across the range of load conditions and shows only a slight increase at maximum load due to the current limit protection circuitry. 1.0 0.5 0.0 0 100 200 300 Load Current [mA] 400 500 Fig 1.5. Vcc Supply Current (No Load) 10000 In the absence of VAUX, the supply current remains fixed at approximately 1mA when VCC reaches the voltage level of about 2.5V. At this point the regulator is enabled and a supply current of 1.0mA is conducted. When VAUX is present, the VCC supply current is less than 10uA until VCC exceeds VAUX, at which point VCC then powers the controller (0.15mA). When VCC reaches VSELECT, the regulator is enabled. Vaux = 0V 1000 I CC [µA] Fig 1.5. VCC Supply Current of the device is shown across the entire VCC range for both VAUX present (3.3V) and absent (0V). 100 Vaux = 3.3V 10 1 2 3 Vcc [V] 4 5 © 2000 Calirornia Micro Devices Corp. All rights reserved. 12/5/2000 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 5 CMPWR300 CALIFORNIA MICRO DEVICES Typical Transient Characteristics The transient characterization test setup shown below includes the effective source impedance of the VCC supply (RS). This was measured to be approximately 0.2Ω. It is recommended that this effective source impedance be no greater than 0.25Ω to ensure precise switching is maintained during VCC selection and deselection. Both the rise and fall times during VCC power-up/down sequencing were controlled to be around 10 millisecond duration. This is considered to represent worst case conditions for most application circuits. A maximum rated load current of 500mA was used during characterization, unless specified otherwise. Cold Start and Full Power Down (Fig 2.1 to 2.6) Cold start power up and power down from VCC, VSBY and VAUX. The output voltage follows the input very smoothly with no disturbance. As soon as the VCC or VSBY input voltage reaches about 2V, VOUT starts rising. It reaches 3.3V when VCC or VSBY equals 3.8V. VOUT remains valid until VCC or VSBY drops below 3.8V. VCC Power Changeover (Fig 2.7 to 2.12) Power transitions between the main VCC and the standby or the auxiliary sources under 375mA load. The transition between VCC and VSBY shows a small disturbance of 80mV on VOUT. Transitions between VCC and VAUX show a disturbance of about 120mV on VOUT. During power up condition, VCC experiences 100mV disturbance. During a selection or deselection transition the DC load current is switching from VAUX to VCC and vice versa, or from VSBY to VCC. In addition to the normal load current there may also be an in-rush current for charging/discharging the load capacitor. The total current pulse being applied to either VAUX or VCC is equal to the sum of the dc load and the corresponding in-rush current. Transient currents in excess of one amp can readily occur for brief intervals when either supply commences to power the load. The oscilloscope traces of VCC power-up/down show the full bandwidth response at the VCC and VOUT pins under full load (500mA) conditions. See Application note AP-211 for more details. This is due to the in-rush current during the power switching. The built-in hysteresis of 300mV ensures the regulator remains turned on throughout the transient. Load and Line Transient Response (Fig 2.13 to 2.16) The load transient response shows a 5mA to 500mA step load with minimal disturbance on VOUT of 80mV. An initial transient overshoot of 80mV occurs and the output settles to its final voltage within a few microseconds. The dc voltage disturbance on the output is approximately 25mV, which demonstrates the regulator output impedance of 50mW. The line step response shows a small disturbance of 25mV on the output when VCC steps from 4.5V to 5.5V. When falling from 5.5V to 4.5V, the output is almost unchanged ©2000 California Micro Devices Corp. All rights reserved. 6 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 12/5/2000 CMPWR300 CALIFORNIA MICRO DEVICES Typical Transient Characteristics - Cold Start and Full Power Down Fig 2.1 VCC cold start Fig 2.2 VCC full power down Fig 2.3 VSBY cold start Fig 2.4 VSBY full power down Fig 2.6 VAUX full power down Fig 2.5 VAUX cold start © 2000 Calirornia Micro Devices Corp. All rights reserved. 12/5/2000 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 7 CMPWR300 CALIFORNIA MICRO DEVICES Typical Transient Characteristics - VCC Power Changeover Fig 2.7 VCC power up (VSBY = 5V) Fig 2.8 VCC power down (VSBY = 5V) Fig 2.9 VCC power up (VAUX = 3.3V) Fig 2.10 VCC power down (VAUX = 3.3V) Fig 2.12 VCC power down (VAUX = 3.1V) Fig 2.11 VCC power up (VAUX = 3.1V) ©2000 California Micro Devices Corp. All rights reserved. 8 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 12/5/2000 CMPWR300 CALIFORNIA MICRO DEVICES Typical Transient Characteristics - Load and Line Transient Response Fig 2.13 VCC Load Transient Response Rising Fig 2.14 VCC Load Transient Response Falling Fig 2.15 VCC Load Step Response Rising Fig 2.16 VCC Load Step Response Falling © 2000 Calirornia Micro Devices Corp. All rights reserved. 12/5/2000 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 9 CMPWR300 CALIFORNIA MICRO DEVICES Typical Thermal Characteristics Thermal dissipation of junction heat consists primarily of two paths in series. The first path is the junction to the case (θJC) thermal resistance which is defined by the package style, and the second path is the case to ambient (θCA) thermal resistance, which is dependent on board layout. The overall junction to ambient (θJA) thermal resistance is equal to: θJA = θJC + θCA For a given package style and board layout, the operating junction temperature is a function of junction power dissipation PJUNC, and the ambient temperature, resulting in the following thermal equation: TJUNC = TAMB + PJUNC (θJC ) + PJUNC (θCA ) = TAMB + PJUNC (θJA ) The CMPWR300SA is housed in a thermally enhanced package where the GND pins (5 through 8) are integral to the leadframe (fused leadframe). When the device is mounted on a double sided printed circuit board with two square inches of copper allocated for heat spreading, the resulting θJA is 50°C/W. Based on a maximum power dissipation of 1.0W (2Vx500mA) with an ambient of 70°C the resulting junction temperature will be: TJUNC = TAMB + PJUNC (θJA ) = 70°C + 1.0W (50°C/W) = 70°C + 50°C = 120°C All thermal characteristics of the CMPWR300SA 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 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 power planes will further enhance the thermal performance of the package. In the event of no copper area being dedicated for heat spreading, a multi-layer board construction will typically provide the CMPWR300SA with an overall θJA of 70°C/W which allows up to 780mW to be safely dissipated. Fig 3.1. Output Voltage vs. Temperature. This shows the regulator V OUT performance up to the maximum rated junction temperature. The overall 125°C variation in junction temperature causes an output voltage change of about 30mV. ©2000 California Micro Devices Corp. All rights reserved. 10 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 12/5/2000 CMPWR300 CALIFORNIA MICRO DEVICES Typical Thermal Characteristics contd 3.320 3.310 Vout [V] Fig 3.2. Output Voltage (Rated) vs. Temperature. This shows the regulator steady state performance when fully loaded (500mA) in an ambient temperature up to the rated maximum of 70°C. The output variation at maximum load is below 10mV across the normal temperature operating. Fig 3.2. Output Voltage (Rated) vs. Temperature 3.300 3.290 500mA load 3.280 0 10 20 30 40 50 60 70 Ambient Temperature [° C] Fig 3.3. Thresholds vs. Temperature 4.5 Vselect 4.4 Threshold [V] Fig 3.3. Thresholds vs. Temperature. This shows the regulator select/deselect threshold variation up to the maximum rated junction temperature. The overall 125°C change in junction temperature causes a 30mV variation in the select threshold voltage (regulator enable). The deselect threshold level varies about 30mV over the 125°C change in junction temperature. This results in the built-in hysteresis have a minimal variation of 40mV over the entire operating junction temperature range. The hysteresis increases with temperature up to 240mV at 125°C. 4.3 4.2 Vdeselect 4.1 0 25 50 75 100 125 150 Junction Temperature [°C] 200 160 Resistance [mOhm] Fig 3.4. VAUX Switch Resistance vs. Temperature. This shows the VAUX switch ON resistance variation up to the maximum rated junction temperature. The overall 125°C change in junction temperature causes a 80mΩ variation in the switch resistance. The switch resistance remains below 0.2Ω, even at a junction temperature of 125°C. Fig 3.4. Vaux Switch Resistance vs. Temperature 120 80 40 0 0 25 50 75 100 125 Junction Temperature [°C] © 2000 Calirornia Micro Devices Corp. All rights reserved. 12/5/2000 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 11