500mA/3.3V SmartORTM Power Regulator CMPWR150 Features Product Description • • • • • • • • The CMPWR150 is a low dropout regulator that delivers up to 500mA of load current at a fixed 3.3V output. An internal threshold level (typically 4.1V) is used to prevent the regulator from being operated below dropout voltage. The device continuously monitors the input supply and will automatically disable the regulator when VCC falls below the threshold level. When the regulator is disabled, the control signal “Drive” (Active Low) is enabled, which allows an external PMOS switch to power the load from an auxiliary 3.3V supply. Automatic detection of VCC input supply Drive output logic to control external switch Glitch-free output during supply transitions 500mA output maximum load current Built-in hysteresis during supply selection Controller operates from either VCC or VOUT 8-pin Power SOIC thermal package RoHS compliant (lead-free) finishing Applications • • • • • • PCI adapter cards Network Interface Cards (NICs) Dual power systems Systems with standby capabilities USB powered devices such as printers, scanners, MP3 players and Zip drives See Application Note AP-211 When VCC is restored to a level above the select threshold, the control signal for the external PMOS switch is disabled and the regulator is once again enabled. All the necessary control circuitry needed to provide a smooth and automatic transition between the supplies has been incorporated. This allows VCC to be dynamically switched without loss of output voltage. The CMPWR150 is housed in an 8-pin SOIC thermally enhanced package which is ideal for space critical applications. The CMPWR150 is available with RoHS compliant lead-free finishing. ©2010 SCILLC. All rights reserved. June 2010 Rev. 3 Publication Order Number: CMPWR150/D CMPWR150 Simplified Electrical Schematic Typical Application Circuit PIN DESCRIPTIONS PIN(S) NAME DESCRIPTION 1 N.C. This is a no-connect pin. 2 VCC VCC is the power source for the internal regulator and is monitored continuously by an internal controller circuit. Whenever VCC exceeds VCCSEL (4.35V typically), the internal regulator (500mA max) will be enabled and deliver a fixed 3.3V at VOUT. When VCC falls below VCCDES (4.10V typically) the regulator will be disabled. Internal loading on this pin is typically 1.0mA when the regulator is enabled, which decreases to 0.15mA whenever the regulator is disabled. If VCC falls below the voltage on the VOUT pin the VCC loading will further decrease to only a few microamperes. During a VCC power up sequence, there will be an effective step increase in VCC line current when the regulator is enabled. The amplitude of this step increase will depend on the DC load current and any necessary current required for charging/discharging the load capacitance. This line current transient will cause a voltage disturbance at the VCC pin. The magnitude of the disturbance will be directly proportional to the effective power supply source impedance being delivered to the VCC input. To prevent chatter during Select and Deselect transitions, a built-in hysteresis voltage of 250mV has been incorporated. It is recommended that the power supply connected to the VCC input have a source resistance of less than 0.25Ω to minimize the event of chatter during the enabling/disabling of the regulator. An input filter capacitor in close proximity to the VCC pin will reduce the effective source impedance and help minimize any disturbances. If the VCC pin is within a few inches of the main input filter, a capacitor may not be necessary. Otherwise an input filter capacitor in the range of 1µF to 10µF will ensure adequate filtering. 5-8 GND GND is the negative reference for all voltages. The current that flows in the ground connection is very low (typically 1.0mA) and has minimal variation over all load conditions. 3 VOUT VOUT is the regulator output voltage connection used to power the load. An output capacitor of ten microfarads is used to provide the necessary phase compensation, thereby preventing oscillation. The capacitor also helps to minimize the peak output disturbance during power supply changeover. When VCC falls below VOUT, then VOUT will be used to provide the necessary quiescent current for the internal reference circuits. This ensures excellent start-up characteristics for the regulator. 4 DRIVE DRIVE is an active LOW logic output intended to be used as the control signal for driving an external PFET whenever the regulator is disabled. This will allow the voltage at VOUT to be powered from an auxiliary supply voltage (3.3V). The Drive pin is pulled HIGH to VCC whenever the regulator is enabled. This ensures that the auxiliary remains isolated during normal regulator operation. Rev. 3 | Page 2 of 15 | www.onsemi.com CMPWR150 VCC VOUT DRIVE Ordering Information PART NUMBERING INFORMATION Pins Package Ordering Part Number1 Part Marking 8 Power SOIC CMPWR150SF CMPWR150SF Note 1: Parts are shipped in Tape & Reel form unless otherwise specified. Rev. 3 | Page 3 of 15 | www.onsemi.com CMPWR150 Specifications ABSOLUTE MAXIMUM RATINGS PARAMETER RATING UNITS +2000 V [GND - 0.5] to [+6.0] [GND - 0.5] to [VCC + 0.5] V V -40 to +150 °C 0 to +70 0 to +125 °C °C 1.0 W ESD Protection (HBM) Pin Voltages VCC DRIVE Storage Temperature Range Operating Temperature Range Ambient Junction Power Dissipation SOIC (see Note 1) Note 1: The SOIC package used is thermally enhanced through the use of a fused integral leadframe. The power rating is based on a printed circuit board heat spreading capability equivalent to 2 square inches of copper connected to the GND pins. Typical multi-layer boards using power plane construction will provide this heat spreading ability without the need for additional dedicated copper area. (Please consult factory for thermal evaluation assistance.) STANDARD OPERATING CONDITIONS PARAMETER RATING UNITS VCC Input Voltage 4.5 to 5.5 V Ambient Operating Temperature Range 0 to +70 °C Load Current 0 to 500 mA CEXT 10 +10% µF Rev. 3 | Page 4 of 15 | www.onsemi.com CMPWR150 ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL PARAMETER CONDITIONS VOUT Regulator Output Voltage 0mA < ILOAD < 500mA IOUT Regulator Output Current VCCSEL Select Voltage Regulator Enabled VCCDES Deselect Voltage Regulator Disabled VCCHYST Hysteresis Voltage ISC IRCC MIN TYP MAX UNITS 3.135 3.300 3.465 V 500 800 4.35 3.90 mA 4.45 V 4.10 V Hysteresis, See Note 2 0.25 V Short-circuit Output Current VCC=5V, VOUT=0V 1200 mA VCC Pin Reverse Leakage VOUT=3.3V; VCC = 0.0V VR LOAD Load Regulation VCC=5V, ILOAD=50mA to 500mA 75 mV VR LINE Line Regulation VCC=4.5 to 5.5V, ILOAD=5mA 2 mV ICC Quiescent Supply Current VCC > VCCSEL, ILOAD=0mA VCCDES > VCC > VOUT VOUT > VCC 1.0 0.15 0.01 3.0 0.25 0.02 mA mA mA IGND Ground Pin Current Regulator Disabled, Note 3 VCC=5V, ILOAD=5mA, Note 3 VCC=5V, ILOAD=500mA, Note 3 0.15 1.0 1.2 0.30 2.5 3.0 mA mA mA ROH ROL Drive Pull-up Resistance Drive Pull-down Resistance RPULLUP to VCC, VCC > VCCSEL RPULLDOWN to GND, VCCDES > VCC 100 200 400 400 Ω Ω TDH TDL Drive High Delay Drive Low Delay CDRIVE=1nF, VCC TRISE < 100ns CDRIVE=1nF, VCC TFALL < 100ns x x 5 1.0 0.2 50 µA µS µS Note 1: Operating Characteristics are over Standard Operating Conditions unless otherwise specified. Note 2: The hysteresis defines the maximum level of acceptable disturbance on VCC during switching. It is recommended that the VCC source impedance be kept below 0.25Ω to ensure the switching disturbance remains below the hysteresis during select/deselect transitions. An input capacitor may be required to help minimize the switching transient. Note 3: Ground pin current consists of controller current (0.15mA) and regulator current if enabled. The controller always draws 0.15mA from either VCC or VOUT, whichever is greater. All regulator current is supplied exclusively from VCC. At high load currents a small increase occurs due to current limit protection circuitry. Rev. 3 | Page 5 of 15 | www.onsemi.com CMPWR150 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. The external PMOS switch was present and resistive load conditions were used. The test data shown here was obtained from engineering samples. The device was modified to allow the regulator to function below the dropout threshold for the purpose of obtaining test data. During normal operation, production parts will shutdown the regulator below a 4.1V supply. Dropout Characteristics of the regulator are shown in Dropout Characteristics. At maximum rated load conditions (500mA), a 100mV drop in regulation occurs when the line voltage collapses below 4.1V. For light load conditions (50mA), regulation is maintained for line voltages as low as 3.5V. In normal operation, the regulator is deselected at 4.1V, which ensures a regulation output droop of less than 100mV is maintained. Figure 1. Dropout Characteristics Load Regulation performance is shown from zero to maximum rated load in Load Regulation. A change in load from 10% to 100% of rated, results in an output voltage change of less than 75mV. This translates into an effective output impedance of approximately 0.15 ohms. Figure 2. Load Regulation Ground Current is shown across the entire range of load conditions in Ground Current. The ground current has minimal variation across the range of load conditions and shows only a slight increase at maximum load. This slight increase at rated load is due to the current limit protection circuitry becoming active. Rev. 3 | Page 6 of 15 | www.onsemi.com CMPWR150 Figure 3. Ground Current VCC Supply Current of the device is shown across the entire VCC range for both VAUX present (3.3V) and absent (0V) in V. In the absence of VAUX, the supply current remains fixed at approximately 0.15mA until VCC reaches the Select voltage threshold of 4.35V. 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 10mA until VCC exceeds VAUX, at which point VCC then powers the controller (0.15mA). When VCC reaches VSELECT, the regulator is enabled. Figure 4. VCC Supply Current (no load) Rev. 3 | Page 7 of 15 | www.onsemi.com CMPWR150 Typical Transient Characteristics The transient characterization test set-up 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 at a 20 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. During a selection or deselection transition, the DC load current is switching from VAUX to VCC and vice versa. 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 1.0 amps 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 information. VCC Power-up Cold Start. Figure 5 shows the output response during an initial VCC power-up with VAUX not present. When VCC reaches the select threshold, the regulator turns on. The uncharged output capacitor causes maximum in-rush current to flow, resulting in a large voltage disturbance at the VCC pin of about 230mV. The built-in hysteresis of 250mV ensures the regulator remains enabled throughout the transient. Prior to VCC reaching an acceptable logic supply level (2V), a disturbance on the Drive pin can be observed. PowerUpCold.bmp Figure 5. VCC Power-up Cold Start Rev. 3 | Page 8 of 15 | www.onsemi.com CMPWR150 Figure 6. Transient Characteristics Test Set-up VCC Power-up (VAUX = 3.3V). Figure 7 shows the output response as VCC approaches the select threshold during a power-up when VAUX is present (3.3V). The output capacitor is already fully charged. When VCC reaches the select threshold, the in-rush current is minimal and the VCC disturbance is only 130mV. The built-in hysteresis of 250mV ensures the regulator remains enabled throughout the transient. VOUT offset = 3.3V, VCC offset = 4.3V PowerUpVaux33v.bmp Figure 7. VCC Power-up (VAUX = 3.3V) VCC Power-up (VAUX =3.0V). Figure 8 shows the output response as VCC approaches the select threshold during power-up. The auxiliary voltage, VAUX is set to a low level of 3.0V. When VCC reaches the select threshold, a modest level of in-rush current is required to further charge the output capacitor resulting in VCC disturbance of 200mV. The built-in hysteresis of 250mV ensures the regulator remains enabled throughout the transient. Rev. 3 | Page 9 of 15 | www.onsemi.com CMPWR150 VOUT offset = 3.3V, VCC offset = 4.3V PowerUpVaux30v.bmp Figure 8. VCC Power-up (VAUX = 3.0V) VCC Power-down (VAUX = 3.3V). Figure 9 shows the output response as VCC approaches the deselect threshold during a power-down transition. VAUX of 3.3V remains present. When VCC reaches the deselect threshold (4.1V), the regulator turns off. This causes a step change reduction in VCC current resulting in a small voltage increase at the VCC input. This disturbance is approximately 100mV and the built-in hysteresis of 250mV ensures the regulator remains disabled throughout the transient. The output voltage experiences a disturbance of approximately 100mV during the transition. VOUT offset = 3.3V, VCC offset = 4.3V PowerDwnVaux33v.bmp Figure 9. VCC Power-down (VAUX = 3.3V) Load Step Response. Figure 10 shows the output response of the regulator during a step load change from 5mA to 500mA (represented on Ch1). An initial transient overshoot of 50mV occurs and the output settles to its final voltage within a few microseconds. The dc voltage disturbance on the output is approximately 75mV, which demonstrates the regulator output impedance of 0.15Ω. VOUT offset = 3.3V Rev. 3 | Page 10 of 15 | www.onsemi.com CMPWR150 LoadStep.bmp Figure 10. Load Step Response Line Step Response. Figure 11 shows the output response of the regulator to a VCC line voltage transient between 4.5V and 5.5V (1Vpp as shown on Ch1). The load condition during this test is 5mA. The output response produces less than 10mV of disturbance on both edges indicating a line rejection of better than 40dB at high frequencies. VOUT offset = 3.3V LineStep.bmp Figure 11. Line Step Response Rev. 3 | Page 11 of 15 | www.onsemi.com CMPWR150 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. 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) Measurements showing performance up to maximum 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. Out Vo lt V T. eps Figure 12. Output Voltage vs. Temperature Output Voltage vs. Temperature. Figure 13 shows the regulator VOUT performance up to the maximum rated junction temperature. The overall 100°C variation in junction temperature causes an output voltage change of about 30mV, reflecting a voltage temperature coefficient of 90ppm/°C. Output Voltage (500mA) vs. Temperature. Output Voltage (500mA) vs. Temperature 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 approximately 25mV across the normal temperature range. Out V R v T. eps Figure 13. Output Voltage (500mA) vs. Temperature Thresholds vs. Temperature. Figure 14 shows the regulator select/deselect threshold variation up to the maximum rated junction temperature. The overall 100°C change in junction temperature causes a 30mV variation in the select threshold voltage (regulator enable). The deselect threshold level varies about 50mV over the 100°C change in junction temperature. This results in the built-in hysteresis having minimal variation over the entire operating junction temperature range. Rev. 3 | Page 12 of 15 | www.onsemi.com CMPWR150 Thres v T. eps Figure 14. Threshold vs. Temperature Rev. 3 | Page 13 of 15 | www.onsemi.com CMPWR150 Mechanical Details SOIC-8 Mechanical Specifications Dimensions for CMPWR150 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 14 of 15 | www.onsemi.com CMPWR150 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. 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