MIC29712 7.5A Fast-Response LDO Regulator Features General Description * * * * * * * The MIC29712 is a high-current, high-accuracy, low-dropout voltage regulator that features fast transient recovery from input voltage surges and output load current changes. This regulator uses a PNP pass element that features Microchip's proprietary Super eta PNP process. Fast Transient Response 7.5A Current Capability 700 mV Dropout Voltage at Full Load Low Ground Current Accurate 2% Guaranteed Tolerance "Zero" Current Shutdown Mode Adjustable Output Voltage Applications * Pentium(R), Pentium(R) Plus, and Power PC(R) Processor Supplies * High-Efficiency "Green" Computer Systems * High-Efficiency Linear Power Supplies * High-Efficiency Switching Supply Post Regulator * Battery-Powered Equipment Package Type A TTL-compatible enable (EN) control pin supports external on/off control. If on/off control is not required, the device may be continuously enabled by connecting EN to IN. The MIC29712 is available in the 5-pin TO-220 package with an operating junction temperature range of 0C to +125C. For applications that require even lower dropout voltage or input voltage greater than 16V, see the MIC29752. EN IN GND OUT ADJ MIC29712 5-Lead TO-220 (T) (Top View) The MIC29712 is an adjustable output voltage device. It is fully protected against overcurrent faults, reversed lead insertion, overtemperature operation, and positive and negative transient voltage spikes. 2018 Microchip Technology Inc. DS20006068A-page 1 MIC29712 Typical Application Circuit MIC29712 On Off VOUT OUT EN R1 VIN ADJ IN GND R2 VOUT = 1.240(R1/R2 + 1) Functional Block Diagram OUT IN EN On/Off Bias O.V. ILIMIT 28V 16V Reference Feedback ADJ Thermal Shutdown GND DS20006068A-page 2 2018 Microchip Technology Inc. MIC29712 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings Input Supply Voltage (VIN) (Note 1) ........................................................................................................... -0.7V to +20V Power Dissipation .................................................................................................................................. Internally Limited Lead Temperature (Soldering, 5 sec.)................................................................................................................... +260C Storage Temperature (TS)...................................................................................................................... -65C to +150C ESD Rating .............................................................................................................................................................Note 2 Operating Ratings Junction Temperature (TJ).......................................................................................................................... 0C to +125C Package Thermal Resistance TO-220 (JC) ...........................................................................................................................................................2C/W TO-220 (JA) .........................................................................................................................................................55C/W Notice: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability. Notice: The device is not guaranteed to function outside its operating ratings. Note 1: The maximum continuous supply voltage is 16V. 2: Devices are ESD sensitive. Handling precautions are recommended. ELECTRICAL CHARACTERISTICS Electrical Characteristics: All measurements at TJ = +25C unless otherwise noted. Bold values are guaranteed across the operating temperature range. Note 1 Parameter Sym. Min. Typ. Max. Units Output Voltage VOUT -2 -- 2 % 10 mA IOUT 7.5A, (VOUT + 1V) VIN 8V, Note 2 Line Regulation VOUT/ VOUT -- 0.06 0.5 % IOUT = 10 mA, (VOUT + 1V) VIN 8V Load Regulation VOUT/ VOUT -- 0.2 1 % VIN = VOUT + 1V, 10 mA IOUT 7.5A, Note 2 Output Voltage Temperature Coefficient VOUT/ T -- 20 100 Note 1: 2: 3: 4: 5: 6: 7: 8: Conditions ppm/C Note 4 Specification for packaged product only. For testing, MIC29712 VOUT is programmed to 5V. VEN 0.8V and VIN 16V, VOUT = 0. Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range. Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value with VOUT + 1V applied to VIN. Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current. For this test, VIN is the larger of 8V or VOUT + 3V. VREF VOUT (VIN - 1 V), 2.4V VIN 8V, 10 mA < IL 7.5A, TJ TJ(MAX). 2018 Microchip Technology Inc. DS20006068A-page 3 MIC29712 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Characteristics: All measurements at TJ = +25C unless otherwise noted. Bold values are guaranteed across the operating temperature range. Note 1 Parameter Min. Typ. Max. -- 80 200 IOUT = 100 mA -- 180 -- IOUT = 750 mA -- 220 -- -- 300 -- -- 450 -- -- 700 1000 -- 6 20 IOUT = 750 mA, VIN = VOUT + 1V -- 20 -- IOUT = 1.5A -- 36 -- -- 100 -- -- 250 375 IGNDDO -- 1 2 mA ILIM -- 11 15 A en -- 260 -- Reference Voltage VREF 1.215 1.240 1.265 Adjust Pin Bias Current IBIAS -- 40 80 -- -- 120 Reference Voltage Temperature Coefficient -- -- 20 -- ppm/C Note 8 Adjust Pin Bias Current Temperature Coefficient -- -- 0.1 -- nA/C VIL -- -- 0.8 VIH 2.4 -- -- Dropout Voltage VOUT = -1% (Note 5) Ground Current (Note 6) Ground Pin Current at Dropout Current Limit Output Noise Voltage 10 Hz to 10 kHz Sym. VDO IGND Units mV Conditions IOUT = 1.5A IOUT = 3A IOUT = 5A IOUT = 7.5A mA IOUT = 3A IOUT = 5A IOUT = 7.5A VIN = 0.5V less than specified VOUT. IOUT = 10 mA VOUT = 0V, Note 7 VRMS CL = 47 F, IOUT = 100 mA, VOUT = 5V Reference V 10 mA IOUT 7.5A, (VOUT + 1V) VIN 8V, Note 2 nA -- -- Enable Input Input Logic Voltage Note 1: 2: 3: 4: 5: 6: 7: 8: V Low (off) High (on) Specification for packaged product only. For testing, MIC29712 VOUT is programmed to 5V. VEN 0.8V and VIN 16V, VOUT = 0. Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range. Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value with VOUT + 1V applied to VIN. Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current. For this test, VIN is the larger of 8V or VOUT + 3V. VREF VOUT (VIN - 1 V), 2.4V VIN 8V, 10 mA < IL 7.5A, TJ TJ(MAX). DS20006068A-page 4 2018 Microchip Technology Inc. MIC29712 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Characteristics: All measurements at TJ = +25C unless otherwise noted. Bold values are guaranteed across the operating temperature range. Note 1 Parameter Enable Pin Input Current Regulator Output Current in Shutdown Note 1: 2: 3: 4: 5: 6: 7: 8: Sym. IIN -- Min. Typ. Max. -- 15 30 -- -- 75 -- -- 2 -- -- 4 -- 10 -- -- -- 20 Units Conditions VEN = VIN A VEN = 0.8V A Note 3 Specification for packaged product only. For testing, MIC29712 VOUT is programmed to 5V. VEN 0.8V and VIN 16V, VOUT = 0. Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range. Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value with VOUT + 1V applied to VIN. Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current. For this test, VIN is the larger of 8V or VOUT + 3V. VREF VOUT (VIN - 1 V), 2.4V VIN 8V, 10 mA < IL 7.5A, TJ TJ(MAX). 2018 Microchip Technology Inc. DS20006068A-page 5 MIC29712 TEMPERATURE SPECIFICATIONS Parameters Sym. Min. Typ. Max. Units Conditions TJ 0 -- +125 C -- Temperature Ranges Operating Temperature Range Lead Temperature -- -- -- +260 C Soldering, 5 sec. Storage Temperature TS -65 -- +150 C -- Thermal Resistance, TO-220 5-Ld JC -- 2 -- C/W -- Thermal Resistance, TO-220 5-Ld JA -- 55 -- C/W -- Package Thermal Resistances Note 1: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the maximum allowable power dissipation will cause the device operating junction temperature to exceed the maximum +125C rating. Sustained junction temperatures above +125C can impact the device reliability. DS20006068A-page 6 2018 Microchip Technology Inc. MIC29712 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. VOUT 3.525V nominal MIC29712 EN VIN = VOUT + 1V OUT IN 0.1F ADJ GND 49.9k 1% 93.1k 1% 6 x 330F AVX TPSE337M006R0100 tantalum VOUT load (not shown): Intel(R) Power Validator FIGURE 2-1: Test Circuit. Load Transient Response FIGURE 2-4: Line Transient Response with 100 mA Load, 100 F Output Capacitance. DROPOUT VOLTAGE (V) 0.6 0.5 0.4 0.3 0.2 0.1 0 FIGURE 2-2: (see Figure 2-1). Load Transient Response FIGURE 2-5: Current. 0 2 4 6 OUTPUT CURRENT (A) 8 Dropout Voltage vs. Output DROPOUT VOLTAGE (V) 1.0 0.8 0.6 0.4 ILOAD = 7.5A 0.2 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) FIGURE 2-3: Line Transient Response with 10 mA Load, 10 F Output Capacitance. 2018 Microchip Technology Inc. FIGURE 2-6: Temperature. Dropout Voltage vs. DS20006068A-page 7 MIC29712 GROUND CURRENT (mA) 50 IOUT = 10mA 8 40 6 30 4 2 0 10 0 FIGURE 2-7: Voltage. 2 4 6 INPUT VOLTAGE (V) Ground Current vs Input GROUND CURRENT (mA) GROUND CURRENT (mA) FIGURE 2-10: Temperature. Ground Current vs 350 IOUT = 7.5A 300 300 250 250 IOUT = 7.5A VIN = VOUT + 1V 200 200 150 150 100 100 50 0 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) 8 350 0 FIGURE 2-8: Voltage. 2 4 6 INPUT VOLTAGE (V) Ground Current vs Input 150 Ground Current vs 150 IOUT = 750mA VIN = VOUT + 1V 4 2 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) DS20006068A-page 8 FIGURE 2-11: Temperature. -50 0 50 100 TEMPERATURE (C) 200 8 FIGURE 2-9: Temperature. 0 -100 250 10 6 50 8 12 GROUND CURRENT (mA) IOUT = 3.75A VIN = VOUT + 1V 20 GROUND CURRENT (mA) GROUND CURRENT (mA) 10 Ground Current vs VIN = VOUT + 1V 100 50 0 FIGURE 2-12: Current. 0 2 4 6 OUTPUT CURRENT (A) 8 Ground Current vs. Output 2018 Microchip Technology Inc. MIC29712 12 CURRENT (A) 10 8 6 VOUT = 0V 4 2 ADJUST PIN CURRENT (nA) 50 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) FIGURE 2-13: Temperature. Short Circuit Current vs. 40 30 20 10 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) FIGURE 2-15: Temperature. Adjust Pin Current vs. 10 VEN = 2V 5 0.01 0.001 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) 1x106 15 0.1 100x103 VEN = 5V 10x103 20 1x103 25 1 100x100 30 10x100 ENABLE CURRENT (A) 35 OUTPUT IMPEDANCE () 10 40 FREQUENCY (Hz) FIGURE 2-14: Temperature. Enable Current vs. 2018 Microchip Technology Inc. FIGURE 2-16: Frequency. Output Impedance vs. DS20006068A-page 9 MIC29712 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE Pin Number Pin Name 1 EN Description Enable (Input): Logic-level ON/OFF control. Do not leave this pin floating. 2 IN 3 GND Ground: Internally connected to tab (ground). 4 OUT Regulated Output. 5 ADJ Output Voltage Adjust: 1.240V feedback from external resistive divider. DS20006068A-page 10 Unregulated Input: +16V maximum supply. 2018 Microchip Technology Inc. MIC29712 4.0 APPLICATION INFORMATION The MIC29712 is a high performance, low-dropout voltage regulator suitable for all moderate to high-current voltage regulator applications. Its 700 mV of dropout voltage at full load make it especially valuable in battery-powered systems and as high efficiency noise filters in post-regulator applications. Unlike older NPN-pass transistor designs, where the minimum dropout voltage is limited by the base-emitter voltage drop and collector-emitter saturation voltage, dropout performance of the PNP output of this device is limited merely by the low VCE saturation voltage. Output regulation is excellent across the input voltage, output current, and temperature ranges. A trade-off for the low dropout voltage is a varying base drive requirement. But Microchip's Super eta PNP process reduces this drive requirement to merely 2% to 5% of the load current. The MIC29712 regulator is fully protected from damage due to fault conditions. Current limiting is provided. The output current under overload conditions is limited to a constant value. Thermal shutdown disables the device when the die temperature exceeds the maximum safe operating temperature. Transient protection allows device (and load) survival even when the input voltage spike above and below nominal. The MIC29712 offers a logic level ON/OFF control: when disabled, the devices draw nearly zero current. An additional feature of this regulator is a common pinout: a design's current requirement may change up or down, but use the same board layout because all of Microchip's high-current Super eta PNP regulators have identical pinouts. 4.1 Thermal Design Linear regulators are simple to use. The most complicated design parameters to consider are thermal characteristics. Thermal design requires the following application-specific parameters: * * * * Maximum ambient temperature, TA Output Current, IOUT Output Voltage, VOUT Input Voltage, VIN First, calculate the power dissipation of the regulator from these values and the device parameters from this data sheet. EQUATION 4-1: P D = 1.03I OUT V IN - V OUT Where: Ground current is approximated by 3% of IOUT. Then the heat sink thermal resistance is determined with the following formula: EQUATION 4-2: T J MAX - T A SA = -------------------------------- - JC + CS PD Where: TJ(MAX) 125C. CS = Between 0C/W and 2C/W. The heat sink may be significantly reduced in applications where the minimum input voltage is known and is large compared with the dropout voltage. Use a series input resistor to drop excessive voltage and distribute the heat between this resistor and the regulator. The low dropout properties of the Super eta PNP regulators allow for significant reductions in regulator power dissipation and the associated heat sink without compromising performance. When this technique is employed, a capacitor of at least 0.1 F is needed directly between the input and regulator ground. Please refer to Application Note 9 for further details and examples on thermal design and heat sink specification. 4.2 Capacitor Requirements For stability and minimum output noise, a capacitor on the regulator output is necessary. The value of this capacitor depends upon the output current; lower currents allow smaller capacitors. MIC29712 is stable with a minimum capacitor value of 47 F at full load. This capacitor need not be an expensive low-ESR type: aluminum electrolytics are adequate. In fact, extremely low ESR capacitors may contribute to instability. Tantalum capacitors are recommended for systems where fast load transient response is important. Where the regulator is powered from a source with a high AC impedance, a 0.1 F capacitor connected between input and GND is recommended. This capacitor should have good characteristics to above 250 kHz. 2018 Microchip Technology Inc. DS20006068A-page 11 MIC29712 4.3 Transient Response and 5V to 3.3V Conversion The MIC29712 has excellent response to variations in input voltage and load current. By virtue of its low dropout voltage, this device does not saturate into dropout as readily as similar NPN-based designs. A 3.3V output Microchip LDO will maintain full speed and performance with an input supply as low as 4.2V, and will still provide some regulation with supplies down to 3.8V, unlike NPN devices that require 5.1V or more for good performance and become nothing more than a resistor under 4.6V of input. Microchip's PNP regulators provide superior performance in "5V to 3.3V" conversion applications, especially when all tolerances are considered. 4.4 Adjustable Regulator Design The MIC29712 allows programming the output voltage anywhere between 1.25V and the 16V maximum operating rating. Two resistors are used. Resistors can be quite large, up to 100 k, because of the very high input impedance and low bias current of the sense comparator. The resistor values are calculated using the following equation: EQUATION 4-3: V OUT R1 = R2 ------------- - 1 1.240 Where: VOUT = The desired output voltage. 4.5 Enable Input The MIC29712 features an enable (EN) input that allows ON/OFF control of the device. Special design allows "zero" current drain when the device is disabled--only micro-amperes of leakage current flows. The EN input has TTL/CMOS compatible thresholds for simple interfacing with logic, or may be directly tied to VIN. Enabling the regulator requires approximately 20 A of current into the EN pin. 4.6 Minimum Load Current The MIC29712 is specified between finite loads. If the output current is to small, leakage currents dominate and the output voltage rises. A 10 mA minimum load current is necessary for proper regulation. TABLE 4-1: MIC29712 RESISTOR VALUES Voltage R1 R2 2.85V 100 k 76.8 k 2.9V 100 k 75 k 3.0V 100 k 69.8 k 3.1V 100 k 66.5 k 3.15V 100 k 64.9 k 3.3V 100 k 60.4 k 3.45V 100 k 56.2 k 3.525V 93.1 k 51.1 k 3.6V 100 k 52.3 k 3.8V 100 k 48.7 k 4.0V 100 k 45.3 k 4.1V 100 k 43.2 k MIC29712WT VIN 4.75V to 5.25V VOUT 3.45V R1 N 10F 33F R2 N VOUT = 1.240V x [1 + (R1 / R2)] FIGURE 4-1: Resistors. DS20006068A-page 12 Adjustable Regulator with 2018 Microchip Technology Inc. MIC29712 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 5-Lead TO-220* Example XXX XXXXXXX WNNNP MIC 29712WT 9626P Legend: XX...X Y YY WW NNN e3 * Product code or customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week `01') Alphanumeric traceability code Pb-free JEDEC(R) designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. , , Pin one index is identified by a dot, delta up, or delta down (triangle mark). Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. Package may or may not include the corporate logo. Underbar (_) and/or Overbar () symbol may not be to scale. 2018 Microchip Technology Inc. DS20006068A-page 13 MIC29712 5-Lead TO-220 Package Outline & Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging. DS20006068A-page 14 2018 Microchip Technology Inc. MIC29712 APPENDIX A: REVISION HISTORY Revision A (September 2018) * Converted Micrel document MIC29712 to Microchip data sheet template DS20006068A. * Minor grammatical text changes throughout. * All reference to and information about the MIC29710 has been removed. 2018 Microchip Technology Inc. DS20006068A-page 15 MIC29712 NOTES: DS20006068A-page 16 2018 Microchip Technology Inc. MIC29712 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office. Examples: Device X X X -XX Part No. Output Voltage Junction Temp. Range Package Media Type Device: MIC29712: 7.5A Fast Response LDO Regulator Output Voltage: <blank>= Adjustable Junction Temperature Range: W = 0C to +125C, RoHS-Compliant Package: T = 5-Lead TO-220 Media Type: <blank>= 50/Tube 2018 Microchip Technology Inc. a) MIC29712WT: Note 1: MIC29712, Adjustable Output Voltage, 0C to +125C Temperature Range, 5-Lead TO-220, 50/Tube Tape and Reel identifier only appears in the catalog part number description. This identifier is used for ordering purposes and is not printed on the device package. Check with your Microchip Sales Office for package availability with the Tape and Reel option. DS20006068A-page 17 MIC29712 NOTES: DS20006068A-page 18 2018 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: * Microchip products meet the specification contained in their particular Microchip Data Sheet. * Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. * There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. * Microchip is willing to work with the customer who is concerned about the integrity of their code. * Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable." Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. 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Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BodyCom, CodeGuard, CryptoAuthentication, CryptoAutomotive, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP, INICnet, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, memBrain, Mindi, MiWi, motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PowerSmart, PureSilicon, QMatrix, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. (c) 2018, Microchip Technology Incorporated, All Rights Reserved. ISBN: 978-1-5224-3484-9 == ISO/TS16949== 2018 Microchip Technology Inc. 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