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| 500mA/3.3V SmartORTM Power Regulator CMPWR150 Features * * * * * * * * 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 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. 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. 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 (c)2010 SCILLC. All rights reserved. June 2010 Rev. 3 Publication Order Number: CMPWR150/D CMPWR150 Typical Application Circuit Simplified Electrical Schematic PIN DESCRIPTIONS PIN(S) 1 2 NAME N.C. VCC DESCRIPTION This is a no-connect pin. 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 0.25 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 1F to 10F will ensure adequate filtering. 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. 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. 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. 5-8 GND 3 VOUT 4 DRIVE Rev. 3 | Page 2 of 15 | www.onsemi.com CMPWR150 VCC VOUT DRIVE Ordering Information PART NUMBERING INFORMATION Pins 8 Package Power SOIC Ordering Part Number1 CMPWR150SF Part Marking 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 ESD Protection (HBM) Pin Voltages VCC DRIVE Storage Temperature Range Operating Temperature Range Ambient Junction Power Dissipation SOIC (see Note 1) RATING +2000 UNITS V [GND - 0.5] to [+6.0] [GND - 0.5] to [VCC + 0.5] -40 to +150 V V C 0 to +70 0 to +125 C C 1.0 W 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 VCC Input Voltage Ambient Operating Temperature Range Load Current CEXT RATING 4.5 to 5.5 0 to +70 0 to 500 10 +10% UNITS V C mA F Rev. 3 | Page 4 of 15 | www.onsemi.com CMPWR150 ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL VOUT IOUT VCCSEL VCCDES VCCHYST ISC IRCC VR LOAD VR LINE ICC PARAMETER Regulator Output Voltage Regulator Output Current Select Voltage Deselect Voltage Hysteresis Voltage Short-circuit Output Current VCC Pin Reverse Leakage Load Regulation Line Regulation Quiescent Supply Current Regulator Enabled Regulator Disabled Hysteresis, See Note 2 VCC=5V, VOUT=0V VOUT=3.3V; VCC = 0.0V VCC=5V, ILOAD=50mA to 500mA VCC=4.5 to 5.5V, ILOAD=5mA VCC > VCCSEL, ILOAD=0mA VCCDES > VCC > VOUT VOUT > VCC Regulator Disabled, Note 3 VCC=5V, ILOAD=5mA, Note 3 VCC=5V, ILOAD=500mA, Note 3 RPULLUP to VCC, VCC > VCCSEL RPULLDOWN to GND, VCCDES > VCC CDRIVE=1nF, VCC TRISE < 100ns CDRIVE=1nF, VCC TFALL < 100ns 3.90 CONDITIONS 0mA < ILOAD < 500mA MIN 3.135 500 TYP 3.300 800 4.35 4.10 0.25 1200 x MAX 3.465 UNITS V mA 4.45 V V V mA 5 50 A mV mV 75 2 1.0 0.15 0.01 0.15 1.0 1.2 100 200 x 3.0 0.25 0.02 0.30 2.5 3.0 400 400 mA mA mA mA mA mA S S IGND Ground Pin Current ROH ROL TDH TDL Drive Pull-up Resistance Drive Pull-down Resistance Drive High Delay Drive Low Delay 1.0 0.2 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 0.25 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 10F. 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 0.2. It is recommended that this effective source impedance be no greater than 0.25 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 0.15. 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 (JC) thermal resistance, which is defined by the package style, and the second path is the case to ambient (CA) 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 (JC ) + PJUNC (CA) Measurements showing performance up to maximum junction temperature of 125C 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 100C 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 70C. 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 100C change in junction temperature causes a 30mV variation in the select threshold voltage (regulator enable). The deselect threshold level varies about 50mV over the 100C 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 Pins Millimeters Dimensions Min A A1 B C D E e H L # per tube # per tape and reel 1.35 0.10 0.33 0.19 4.80 3.80 Max 1.75 0.25 0.51 0.25 5.00 4.19 Min 0.053 0.004 0.013 0.007 0.189 0.150 Max 0.069 0.010 0.020 0.010 0.197 0.165 SOIC 8 Inches 1.27 BSC 5.80 0.40 6.20 1.27 0.050 BSC 0.228 0.016 0.244 0.050 100 pieces* 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. 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: orderlit@onsemi.com 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 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative Rev. 3 | Page 15 of 15 | www.onsemi.com |
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