MIC2920A/29201/29202/29204 Micrel, Inc. MIC2920A/29201/29202/29204 400mA Low-Dropout Voltage Regulator General Description Features The MIC2920A family are "bulletproof," efficient voltage regulators with very low dropout voltage (typically 40mV at light loads and 370mV at 250mA), and very low quiescent current (140A typical). The quiescent current of the MIC2920A increases only slightly in dropout, prolonging battery life. Key MIC2920A features include protection against reversed battery, fold-back current limiting, and automotive "load dump" protection (60V positive transient). * * * * * * * * The MIC2920 is available in several configurations. The MIC2920A-x.x devices are three pin fixed voltage regulators available in 3.3V, 4.85V, 5V, and 12V outputs. The MIC29201 is a fixed regulator offering a logic compatible ON/OFF (shutdown) input and an error flag output. This flag may also be used as a power-on reset signal. A logic-compatible shutdown input is provided on the adjustable MIC29202 which allows the regulator to be switched on and off. The MIC29204 8-pin SOIC adjustable regulator includes both shutdown and error flag pins and may be pin-strapped for 5V output or programmed from 1.24V to 26V using two external resistors. * * * * High output voltage accuracy Guaranteed 400mA output Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Input withstands -20V reverse battery and 60V positive transients Error flag warns of output dropout Logic-controlled electronic shutdown Output programmable from 1.24V to 26V (MIC29202/MIC29204) Available in TO-220-3, TO-220-5, and surface-mount TO-263-5, SOT-223, and SO-8 packages. Applications * * * * * * * * * Battery-powered equipment Cellular telephones Laptop, notebook, and palmtop computers PCMCIA VCC and VPP regulation/switching Bar code scanners Automotive electronics SMPS post-regulators Voltage reference High-efficiency linear power supplies Pin Configuration TAB TAB OUTPUT 1 8 INPUT SENSE 2 7 NC SHUTDOWN 3 6 NC GROUND 4 5 ERROR MIC29201-3.3BM (SOIC-8) OUTPUT 1 SENSE 2 8 INPUT 7 A D JUST SHUTDOWN 3 6 5V TAP GROUND 4 5 ERROR 1 2 3 INPUT OUTPUT GROUND MIC2920A-x.xBS (SOT-223) TAB MIC29204BM (SOIC-8) 5-Lead Package Pinouts MIC29201 MIC29202 1) Error Adjust 2) Input Shutdown 3) Ground Ground 4) Output Input 5) Shutdown Output TAB 1 IN 1 2 3 4 5 MIC29201/29202BU (TO-263-5) 3 OU T GND 2 MIC2920A-xxBT (TO-220) 1 2 3 4 5 MIC29201/29202BT (TO-220-5) Tab is Ground on SOT-223, TO-220, and TO-263 packages. Micrel, Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com February 2005 1 M9999-021505 MIC2920A/29201/29202/29204 Micrel, Inc. Ordering Information Part Number Voltage Junction Temp. Range Package Standard Pb-Free MIC2920A-3.3BS MIC2920A-3.3WS* 3.3V -40C to +125C SOT-223 MIC2920A-3.3BT MIC2920A-3.3WT* 3.3V -40C to +125C TO-220-3 MIC2920A-4.8BS MIC2920A-4.8WS* 4.85V -40C to +125C SOT-223 MIC2920A-4.8BT MIC2920A-4.8WT* 4.85V -40C to +125C TO-220-3 MIC2920A-5.0BS MIC2920A-5.0WS* 5.0V -40C to +125C SOT-223 MIC2920A-5.0BT MIC2920A-5.0WT* 5.0V -40C to +125C TO-220-3 MIC2920A-12BS MIC2920A-12WS* 12V -40C to +125C SOT-223 MIC2920A-12BT MIC2920A-12WT* 12V -40C to +125C TO-220-3 MIC29201-3.3BM MIC29201-3.3YM 3.3V -40C to +125C SO-8 MIC29201-3.3BT MIC29201-3.3WT* 3.3V -40C to +125C TO-220-5 MIC29201-3.3BU MIC29201-3.3WU* 3.3V -40C to +125C TO-263-5 MIC29201-4.8BT MIC29201-4.8WT* 4.85V -40C to +125C TO-220-5 MIC29201-4.8BU MIC29201-4.8WU* 4.85V -40C to +125C TO-263-5 MIC29201-5.0BT MIC29201-5.0WT* 5.0V -40C to +125C TO-220-5 MIC29201-5.0BU MIC29201-5.0WU* 5.0V -40C to +125C TO-263-5 MIC29201-12BT MIC29201-12WT* 12V -40C to +125C TO-220-5 MIC29201-12BU MIC29201-12WU* 12V -40C to +125C TO-263-5 MIC29202BT MIC29202WT* Adj -40C to +125C TO-220-5 MIC29202BU MIC29202WU* Adj -40C to +125C TO-263-5 MIC29204BM MIC29204YM 5V and Adj -40C to +125C SO-8 MIC29204BN MIC29204YN 5V and Adj -40C to +125C 8-pin PDIP * Pb-Free RoHS compliant with high-melting solder exemption. M9999-021505 2 February 2005 MIC2920A/29201/29202/29204 Micrel, Inc. Absolute Maximum Ratings Operating Ratings Input Supply Voltage .................................................-20V to +60V Adjust Input Voltage (Notes 9 and 10) ......................-1.5V to +26V Power Dissipation ................................... Internally Limited, Note 1 Operating Junction Temperature Range ............. -40C to +125C Lead Temperature (Soldering, 5 seconds) ............................260C Storage Temperature Range ............................... -65C to +150C Operating Input Supply Voltage ......................................2V to 26V Adjust Input Voltage (Notes 9 and 10) ......................-1.5V to +26V Shutdown Input Voltage ..........................................-0.3V to +30V Error Comparator Output Voltage ............. -0.3V to +30VOperating Junction Temperature Range ............................. -40C to +125C Thermal Characteristics: SOT-223 JC .............................................................. 15C/W TO-220 JC ................................................................... 3C/W TO-263 JC ................................................................... 3C/W 8-Pin SOIC JA .............................................................Note 1 If Military/Aerospace specified devices are required, contact your local Micrel representative/distributor for availability and specifications. Across the full operating temperature, the minimum input voltage range for full output current is 4.3V to 26V. Output will remain in-regulation at lower output voltages and low current loads down to an input of 2V at 25C. Electrical Characteristics Limits in standard typeface are for TJ = 25C and limits in boldface apply over the full operating temperature range. Unless otherwise specified, VIN = VOUT + 1V, IL = 1mA, CL = 10F. Adjustable versions are set for an ouptu of 5V. The MIC29202 VSHUTDOWN 0.7V. The eight pin MIC29204 is configured with the Adjust pin tied to the 5V Tap, the Output is tied to Output Sense (VOUT = 5V), and VSHUTDOWN 0.7V. Symbol VO Parameter Conditions Min Output Voltage Accuracy Variation from factory trimmed VOUT Max Units -1 -2 1 2 % 1mA IL 400mA, across temp. range -2.5 2.5 MIC2920A-12 and 29201-12 only -1.5 -3 1.5 3 -4 4 1mA IL 400mA, across temp. range Typ Output Voltage Temperature Coef. (Note 2) 80 350 VO VO Line Regulation VIN = VOUT + 1V to 26V 0.03 0.10 0.40 % VO VO Load Regulation IL = 1 to 250mA (Note 3) 0.04 0.16 0.30 % VIN - VO Dropout Voltage (Note 4) IL = 1mA 100 150 180 mV VOUT > 10V only IL = 100mA IL = 250mA IL = 400mA IGND VOUT > 10V only VOUT > 10V only 250 350 370 500 400 IL = 400mA 13 VIN = 0.5V less than designed VOUT (VOUT = 3.3V) IO = 1mA 180 400 A ILIMIT Current Limit VOUT = 0V (Note 6) 425 100 1200 mA VO PD Thermal Regulation (Note 7) 0.05 0.2 %/W Output Noise Voltage (10Hz to 100kHz) IL = 100mA CL = 10F CL = 100F 400 260 February 2005 140 IL = 100mA 1.3 IL = 250mA 5 600 750 Ground Pin Current at Dropout (Note 5) en IL = 1mA ppm/C 200 300 2 2.5 9 12 15 IGNDDO Ground Pin Current (Note 5) 20 100 VO T 3 A mA V RMS M9999-021505 MIC2920A/29201/29202/29204 Parameter Micrel, Inc. Conditions Min Typ Max Units 1.235 1.247 1.260 V 1.266 V 1.260 1.270 V MIC29202, MIC29204 Reference Voltage MIC29202 1.223 1.210 Reference Voltage MIC29202 (Note 8) 1.204 Reference Voltage MIC29204 1.210 1.200 Reference Voltage MIC29204 (Note 8) 1.185 Adjust Pin Bia Current Reference Voltage Temperature Coefficient 1.235 20 (Note 7) Adjust Pin Bias Current Temperature Coefficient 1.285 V 40 60 nA 20 ppm/C 0.1 nA/C Error Comparator MIC29201, MIC29204 Output Leakage Current VOH = 26V 0.01 1.00 2.00 A Output Low Voltage VIN = 4.5V IOL = 250A 150 250 400 mV Upper Threshold Voltage (Note 9) Lower Threshold Voltage (Note 9) 75 Hysteresis (Note 9) 15 Shutdown Input MIC29201, MIC29202, MIC29204 Input Logic Voltage Shutdown Pin Input Current Regulator Output Current in Shutdown M9999-021505 40 25 60 1.3 Low (ON) High (OFF) 2.0 mV 95 140 mV mV 0.7 V VSHUTDOWN = 2.4V 30 50 100 A VSHUTDOWN = 26V 450 600 750 A 3 10 20 A (Note 10) 4 February 2005 MIC2920A/29201/29202/29204 Notes: General: Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: Note 10: Note 11: Note 12: Micrel, Inc. Devices are ESD protected; however, handling precautions are recommended. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ (MAX), the junction-to-ambient thermal resistance, JA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: P(MAX) = (TJ(MAX) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The junction to ambient thermal resistance of the MIC29204BM is 160C/W mounted on a PC board. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Dropout Voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential. At low values of programmed output voltage, the minimum input supply voltage of 4.3V over temperature must be taken into account. The MIC2920A operates down to 2V of input at reduced output current at 25C. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current. The MIC2920A features fold-back current limiting. The short circuit (VOUT = 0V) current limit is less than the maximum current with normal output voltage. Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 200mA load pulse at VIN = 20V (a 4W pulse) for T = 10ms. VREF VOUT (VIN - 1 V), 4.3V VIN 26V, 1 mA < IL 400 mA, TJ TJ MAX. Comparator thresholds are expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT /VREF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 V = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. VSHUTDOWN 2V, VIN 26V,VOUT = 0, with Adjust pin tied to 5V Tap or to the R1, R2 junction (see Figure 3) with R1 150k. When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. Maximum positive supply voltage of 60V must be of limited duration (< 100ms) and duty cycle ( 1%). The maximum continuous supply voltage is 26V. Schematic Diagram ADJUST IN R18 20k Q15A Q15B Q24 Q26 Q25 OUT Q9 Q3 R11 18 k Q7 Q4 Q6 R11 20.6 k Q1 10 R2 50 k Q40 Q17 Q16 R27 R17 12 k Q14 V TAP R28 Q2 Q20 R1 20 k Q42 SENSE Q8 Q5 C1 20 pF R6 140 k R5 180 k Q13 Q41 Q21 Q23 C2 40 pF R9 27.8 k Q12 Q22 R10 150 k R8 31.4 k R12 110 k R13 100 k R15 100 k R14 350 k R16 30 k Q11 R17 10 Q29 R30 30 k Q19 Q18 R3 50 k Q28 R4 13 k R21 8 50 k Q30 Q31 Q37 10 k R22 150 k Q36 R23 60 k ERROR Q34 Q38 R26 60 k D E NO T E S CO NNE CT I O N O N MIC2920A-xx AND MIC29201-xx VERSIONS ONLY R25 2.8 k GND Q39 February 2005 SHDN R24 50 k 5 M9999-021505 MIC2920A/29201/29202/29204 Micrel, Inc. Typical Characteristics Dropout V oltage vs . Output C urrent 700 200 100 0 0 100 200 300 OUTPUT CURRENT (mA) 400 I LOAD = 400mA 300 200 100 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) 400 G round C urrent vs . Output C urrent 20 5 500 OUTPUT VOLTAGE (V) 300 G round C urrent vs . S upply V oltage 200 3 2 I LOAD = 400mA 1 0 1 2 3 4 INPUT VOLTAGE (V) 5 6 G round C urrent vs . S upply V oltage 30 1 100 10 OUTPUT CURRENT (mA) 0 G round C urrent vs . T emperature 3 GROUND CURRENT (mA) 0.15 0.10 I OUT = 1mA 0.05 F ixed 3.3V Output V oltage vs . T emperature M9999-021505 2 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) 7 G round C urrent vs . T emperature 650 I LOAD = 100mA CURRENT (mA) 550 500 3 S AMP LE S (HI/AV G /LO) 450 400 350 V OUT = 0V 300 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) 6 V OUT = 5V I OUT = 400mA 5 0 2 4 6 8 INPUT VOLTAGE (V) 10 G round C urrent vs . T emperature 20 I LOAD = 400mA 15 10 5 G round C urrent vs . S upply V oltage V OUT = V NOMINAL - 0.5V V OUT = 3.3V 10 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) S hort C irc uit and Maximum C urrent vs . T emperature 600 15 25 1 700 20 0 8 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) 0.00 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) 3.40 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.20 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) V OUT = 5V I OUT = 1mA 50 400 GROUND CURRENT (mA) 100 GROUND CURRENT (A) 1 150 GROUND CURRENT (mA) GROUND CURRENT (A) GROUND CURRENT (mA) GROUND CURRENT (mA) I LOAD = 1mA 25 0.20 OUTPUT VOLTAGE (V) 4 0 10 0.1 Dropout C harac teris tic s 6 600 400 DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 500 Dropout V oltage vs . T emperature 1000 900 R LOAD = 100 800 700 600 500 400 300 200 100 0 -100 -30 -20 -10 0 10 INPUT VOLTAGE (V) 20 30 February 2005 MIC2920A/29201/29202/29204 Micrel, Inc. 5 10 15 TIME (ms) 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) 20 25 0 -50 600 -100 400 0 -200 0 -5 20 C OUT = 10 F I L = 10mA 20 1mA 200 L ine T rans ient -20 -40 10 INPUT (V) 8 6 4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 TIME (ms) 10 0 0 5 10 15 TIME (ms) 20 25 L ine T rans ient C OUT = 100 F I L = 10mA -10 -20 10 8 6 4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 TIME (ms) Output Impedanc e vs . F requenc y 10 1 0.1 I LOAD = 10mA 0.01 1x10 0 OUTPUT IMPEDANCE () 50 C OUT = 100F 1 10 1x10 6 10 0 40 20 I LOAD = 1mA -5 100x10 3 30 OUTPUT (mV) 0 -200 MIC 29202 A djus t P in C urrent vs . T emperature 40 1mA 200 OUTPUT (mV) ADJUST PIN CURRENT (nA) 50 400 10x10 3 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) 600 -200 1x10 3 25 -100 100x10 0 V E N = 2V 0 10x10 0 50 OUTPUT (mV) 75 OUTPUT (mA) V E N = 5V L oad T rans ient 100 C OUT = 10F 100 INPUT (V) ENABLE CURRENT (A) 100 L oad T rans ient 200 OUTPUT (mA) 125 OUTPUT (mV) MIC 29201/2 S hutdown C urrent vs . T emperaure 100 1k 10k 100k 1M FREQUENCY (Hz) R ipple R ejec tion 0 C L = 10F REJECTION (dB) -20 I L = 100mA -40 1mA -60 -80 -100 1E+1 10 1E+2 1k 1E+4 10k 1E+5 100k 1E+6 1M 100 1E+3 FREQUENCY (Hz) February 2005 7 M9999-021505 MIC2920A/29201/29202/29204 Micrel, Inc. Applications Information or some other supply voltage. In determining a value for this resistor, note that while the output is rated to sink 250A, this sink current adds to battery drain in a low battery condition. Suggested values range from 100k to 1M. The resistor is not required if this output is unused. External Capacitors A 10F (or greater) capacitor is required between the MIC2920A output and ground to prevent oscillations due to instability. Most types of tantalum or aluminum electrolytics will be adequate; film types will work, but are costly and therefore not recommended. Many aluminum electrolytics have electrolytes that freeze at about -30C, so solid tantalums are recommended for operation below -25C. The important parameters of the capacitor are an effective series resistance of about 5 or less and a resonant frequency above 500kHz. The value of this capacitor may be increased without limit. Programming the Output Voltage (MIC29202/29204) The MIC29202/29204 may be programmed for any output voltage between its 1.235V reference and its 26V maximum rating, using an external pair of resistors, as shown in Figure 3. The complete equation for the output voltage is At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 2.2F for current below 10mA or 1F for currents below 1mA. Adjusting the MIC29202/29204 to voltages below 5V runs the error amplifier at lower gains so that more output capacitance is needed. For the worst-case situation of a 500mA load at 1.23V output (Output shorted to Adjust) a 47F (or greater) capacitor should be used. VOUT = VREF x { 1 + R1/R2 } - |IFB| R1 where VREF is the nominal 1.235 reference voltage and IFB is the Adjust pin bias current, nominally 20nA. The minimum recommended load current of 1A forces an upper limit of 1.2M on the value of R2, if the regulator must work with no load (a condition often found in CMOS in standby), IFB will produce a -2% typical error in VOUT which may be eliminated at room temperature by trimming R1. For better accuracy, choosing R2 = 100k reduces this error to 0.17% while increasing the resistor program current to 12A. Since the MIC29202/29204 typically draws 110A at no load with SHUTDOWN open-circuited, this is a negligible addition. The MIC29204 may be pin-strapped for 5V using the internal voltage divider by tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (Adjust) to Pin 6 (V Tap). The MIC2920A/29201 will remain in regulation with a minimum load of 1mA. When setting the output voltage of the MIC29202/29204 versions with external resistors, the current through these resistors may be included as a portion of the minimum load. A 0.1F capacitor should be placed from the MIC2920A input to ground if there is more than 10 inches of wire between the input and the AC filter capacitor or if a battery is used as the input. Configuring the MIC29201-3.3BM For the MIC29201-3.3BM, the output (Pin 1) and sense pin (pin 2), must be connected to ensure proper operation. They are not connected internally. Error Detection Comparator Output (MIC29201/MIC29204) Reducing Output Noise A logic low output will be produced by the comparator whenever the MIC29201/29204 output falls out of regulation by more than approximately 5%. This figure is the comparator's built-in offset of about 75mV divided by the 1.235V reference voltage. (Refer to the block diagram on Page 1). This trip level remains "5% below normal" regardless of the programmed output voltage of the MIC29201/29204. For example, the error flag trip level is typically 4.75V for a 5V output or 11.4V for a 12V output. The out of regulation condition may be due either to low input voltage, extremely high input voltage, current limiting, or thermal limiting. In reference applications it may be advantageous to reduce the AC noise present at the output. One method is to reduce the regulator bandwidth by increasing the size of the output capacitor. This is relatively inefficient, as increasing the capaci4.75V OUTPUT VOLTAGE ERROR Figure 1 is a timing diagram depicting the ERROR signal and the regulated output voltage as the MIC29201/29204 input is ramped up and down. The ERROR signal becomes valid (low) at about 1.3V input. It goes high at about 5V input (the input voltage at which VOUT = 4.75). Since the MIC29201/29204's dropout voltage is load-dependent (see curve in Typical Performance Characteristics), the input voltage trip point (about 5V) will vary with the load current. The output voltage trip point (approximately 4.75V) does not vary with load. INPUT VOLTAGE NOT * VALID NOT * VALID 5V 1.3V * SEE APPLICATIONS INFORMATION Figure 1. ERROR Output Timing The error comparator has an NPN open-collector output which requires an external pull-up resistor. Depending on system requirements, this resistor may be returned to the 5V output M9999-021505 8 February 2005 MIC2920A/29201/29202/29204 Micrel, Inc. Automotive Applications tor from 1F to 220F only decreases the noise from 430V to 160VRMS for a 100kHz bandwidth at 5V output. Noise can be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick 1 C BYPASS = 2 R1 * 200 Hz or about 0.01F. When doing this, the output capacitor must be increased to 10F to maintain stability. These changes reduce the output noise from 430V to 100V rms for a 100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. The MIC2920A is ideally suited for automotive applications for a variety of reasons. It will operate over a wide range of input voltages with very low dropout voltages (40mV at light loads), and very low quiescent currents (100A typical). These features are necessary for use in battery powered systems, such as automobiles. It is a "bulletproof" device with the ability to survive both reverse battery (negative transients up to 20V below ground), and load dump (positive transients up to 60V) conditions. A wide operating temperature range with low temperature coefficients is yet another reason to use these versatile regulators in automotive designs. Typical Applications +V IN V IN 100k +V IN V OUT = 5V V OUT + 10F ERROR O U T PU T 5 ERROR SHUTDOWN INPUT 3 V OUT VOUT 1 SHUTDOWN OFF GND ADJU ST 7 4 1.23V ON GND 8 VIN R1 V OUT = V R E F x (1 + ) R2 26V 1.2 R 1 100 pF 10F R2 VREF NOTE: PINS 2 AND 6 ARE LEFT OPEN Figure 2. MIC2920A-5.0 Fixed +5V Regulator Figure 3. MIC29202/29204 Adjustable Regulator. Pinout is for MIC29204. 5.3V +V IN 8 +VIN ERROR OUTPUT 5 ERROR SHUTDOWN INPUT 3 *V OUT = V IN VOUT 1 SHUTDOWN INPUT 3 HIGH = OFF OFF ON 8 +V IN 1 SHUTDOWN + 100pF LOW = ON SD V CC OUT VOUT GND 4 GND ADJ U ST 4 7 HIGH = 5V OUT * Minimum Input-Output Voltage ranges from 40mV to 400mV, depending on load current LOW = 3.3V OUT ADJUST 7 470 k 220k 1% 300k 1% 10F 180k 1% 2N2222 PIN 3 LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V. Figure 5. MIC29202/29204 5.0V or 3.3V Selectable Regulator with Shutdown. Pinout is for MIC29204. Figure 4. MIC29204 Wide Input Voltage Range Current Limiter February 2005 9 M9999-021505 MIC2920A/29201/29202/29204 Micrel, Inc. Package Information 8-Pin SOIC (M) 3.15 (0.124) 2.90 (0.114) CL 3.71 (0.146) 7.49 (0.295) 3.30 (0.130) 6.71 (0.264) CL 2.41 (0.095) 2.21 (0.087) 1.04 (0.041) 0.85 (0.033) 4.7 (0.185) 4.5 (0.177) 0.10 (0.004) 0.02 (0.0008) DIMENSIONS: MM (INCH) 6.70 (0.264) 6.30 (0.248) 1.70 (0.067) 16 1.52 (0.060) 10 10 MAX 0.38 (0.015) 0.25 (0.010) 0.84 (0.033) 0.64 (0.025) 0.91 (0.036) MIN SOT-223 (S) M9999-021505 10 February 2005 MIC2920A/29201/29202/29204 Micrel, Inc. 3-Lead TO-220 (T) 5-Lead TO-220 (T) February 2005 11 M9999-021505 MIC2920A/29201/29202/29204 Micrel, Inc. 4 1 2 1 1 2 3 4 1 3 5-Lead TO-263 (U) MICREL INC. TEL 2180 FORTUNE DRIVE + 1 (408) 944-0800 FAX SAN JOSE, CA 95131 + 1 (408) 474-1000 WEB USA http://www.micrel.com This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 1998 Micrel Incorporated M9999-021505 12 February 2005