MIC29150/29300/29500/29750 High-Current Low-Dropout Regulators General Description Features The MIC29150/29300/29500/29750 are high current, high accuracy, low-dropout voltage regulators. Using Micrel's ® proprietary Super βeta PNP process with a PNP pass element, these regulators feature 350mV to 425mV (full load) typical dropout voltages and very low ground current. Designed for high current loads, these devices also find applications in lower current, extremely low dropout-critical systems, where their tiny dropout voltage and ground current values are important attributes. The MIC29150/29300/29500/29750 are fully protected against overcurrent faults, reversed input polarity, reversed lead insertion, overtemperature operation, and positive and negative transient voltage spikes. Five pin fixed voltage versions feature logic level ON/OFF control and an error flag which signals whenever the output falls out of regulation. Flagged states include low input voltage (dropout), output current limit, overtemperature shutdown, and extremely high voltage spikes on the input. On the MIC29xx1 and MIC29xx2, the ENABLE pin may be tied to VIN if it is not required for ON/OFF control. The MIC29150/29300/29500 are available in 3-pin and 5-pin 2 TO-220 and surface mount TO-263 (D Pak) packages. The MIC29750 7.5A regulators are available in 3-pin and 5-pin TO-247 packages. The 1.5A, adjustable output MIC29152 is available in a 5-pin power D-Pak (TO-252) package. For applications with input voltage 6V or below, see MIC37xxx LDOs. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • High current capability: − MIC29150/29151/29152/29153.............................. 1.5A − MIC29300/29301/29302/29303................................. 3A − MIC29500/29501/29502/29503................................. 5A − MIC29750/29751/29752 ......................................... 7.5A • Low-dropout voltage • Low ground current • Accurate 1% guaranteed tolerance • Extremely fast transient response • Reverse-battery and “Load Dump” protection • Zero-current shutdown mode (5-pin versions) • Error flag signals output out-of-regulation (5-pin versions) • Also characterized for smaller loads with industryleading performance specifications • Fixed voltage and adjustable versions Applications • • • • • Battery-powered equipment High-efficiency “Green” computer systems Automotive electronics High-efficiency linear lower supplies High-efficiency lost-regulator for switching supply _________________________________________________________________________________________________________________________ Typical Application** Fixed Output Voltage Adjustable Output Voltage (*See Minimum Load Current Section) Super βeta PNP is a registered trademark of Micrel, Inc. **See Thermal Design Section Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com December 2012 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Ordering Information Part Number Junction Temperature (1) Range Voltage Current Package (2) –40°C to +125°C 3.3 1.5A 3-Pin TO-220 (2) –40°C to +125°C 3.3 1.5A 3-Pin TO-263 (2) –40°C to +125°C 5 1.5A 3-Pin TO-220 (2) (2) Standard RoHS Compliant MIC29150-3.3BT MIC29150-3.3WT MIC29150-3.3BU MIC29150-3.3WU MIC29150-5.0BT MIC29150-5.0BU MIC29150-5.0WT MIC29150-5.0WU –40°C to +125°C 5 1.5A 3-Pin TO-263 (2) –40°C to +125°C 12 1.5A 3-Pin TO-220 (2) –40°C to +125°C 12 1.5A 3-Pin TO-263 (2) –40°C to +125°C 3.3 1.5A 5-Pin TO-220 (2) –40°C to +125°C 3.3 1.5A 5-Pin TO-263 (2) –40°C to +125°C 5 1.5A 5-Pin TO-220 (2) MIC29150-12BT MIC29150-12WT MIC29150-12BU MIC29150-12WU MIC29151-3.3BT MIC29151-3.3WT MIC29151-3.3BU MIC29151-3.3WU MIC29151-5.0BT MIC29151-5.0WT MIC29151-5.0BU MIC29151-5.0WU MIC29151-12BT –40°C to +125°C 5 1.5A 5-Pin TO-263 (2) –40°C to +125°C 12 1.5A 5-Pin TO-220 (2) MIC29151-12WT MIC29151-12BU MIC29151-12WU MIC29152BT MIC29152WT MIC29152BU –40°C to +125°C 12 1.5A 5-Pin TO-263 (2) –40°C to +125°C Adjustable 1.5A 5-Pin TO-220 (2) –40°C to +125°C Adjustable 1.5A 5-Pin TO-263 MIC29152WU (2) MIC29152WD –40°C to +125°C Adjustable 1.5A 5-Pin TO-252 (3) Contact Factory –40°C to +125°C Adjustable 1.5A 5-Pin TO-220 (3) Contact Factory — MIC29153BT MIC29153BU MIC29300-3.3BT –40°C to +125°C Adjustable 1.5A 5-Pin TO-263 (2) –40°C to +125°C 3.3 3.0A 3-Pin TO-220 (2) –40°C to +125°C 3.3 3.0A 3-Pin TO-263 (2) –40°C to +125°C 5 3.0A 3-Pin TO-220 (2) MIC29300-3.3WT MIC29300-3.3BU MIC29300-3.3WU MIC29300-5.0BT MIC29300-5.0WT MIC29300-5.0BU MIC29300-5.0WU –40°C to +125°C 5 3.0A 3-Pin TO-263 (2) –40°C to +125°C 12 3.0A 3-Pin TO-220 (2) –40°C to +125°C 12 3.0A 3-Pin TO-263 (2) –40°C to +125°C 3.3 3.0A 5-Pin TO-220 (2) –40°C to +125°C 3.3 3.0A 5-Pin TO-263 (2) –40°C to +125°C 5 3.0A 5-Pin TO-220 (2) MIC29300-12BT MIC29300-12WT MIC29300-12BU MIC29300-12WU MIC29301-3.3BT MIC29301-3.3WT MIC29301-3.3BU MIC29301-3.3WU MIC29301-5.0BT MIC29301-5.0WT MIC29301-5.0BU MIC29301-5.0WU MIC29301-12BT –40°C to +125°C 5 3.0A 5-Pin TO-263 (2) –40°C to +125°C 12 3.0A 5-Pin TO-220 (2) MIC29301-12WT MIC29301-12BU MIC29301-12WU MIC29302BT MIC29302WT MIC29302BU MIC29303BT –40°C to +125°C 12 3.0A 5-Pin TO-263 (2) –40°C to +125°C Adjustable 3.0A 5-Pin TO-220 (2) –40°C to +125°C Adjustable 3.0A 5-Pin TO-263 (2) –40°C to +125°C Adjustable 3.0A 5-Pin TO-220 –40°C to +125°C Adjustable 3.0A 5-Pin TO-263 –40°C to +125°C 3.3 5.0A 3-Pin TO-220 MIC29302WU MIC29303WT (2) MIC29303BU MIC29303WU MIC29500-3.3BT MIC29500-3.3WT (2) Notes: 1. Junction temperature. 2. RoHS compliant with ‘high-melting solder’ exemption. 3. Special Order; please contact factory for availability. December 2012 2 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Ordering Information (Continued) Part Number (2) Standard RoHS Compliant 5 5.0A 3-Pin TO-220 –40°C to +125°C 3.3 5.0A 5-Pin TO-220 (2) –40°C to +125°C 3.3 5.0A 5-Pin TO-263 (2) –40°C to +125°C 5 5.0A 5-Pin TO-220 (2) MIC29501-3.3WT MIC29501-3.3WU MIC29501-5.0WT MIC29501-5.0BU MIC29501-5.0WU MIC29502BT MIC29502WT –40°C to +125°C 5 5.0A 5-Pin TO-263 (2) –40°C to +125°C Adj. 5.0A 5-Pin TO-220 (2) –40°C to +125°C Adj. 5.0A 5-Pin TO-263 (2) –40°C to +125°C Adj. 5.0A 5-Pin TO-220 (2) –40°C to +125°C Adj. 5.0A 5-Pin TO-263 (4) –40°C to +125°C 3.3 7.5A 3-Pin TO-247 (4) –40°C to +125°C 5 7.5A 3-Pin TO-247 (4) –40°C to +125°C 3.3 7.5A 5-Pin TO-247 (4) –40°C to +125°C 5 7.5A 5-Pin TO-247 (2, 4) –40°C to +125°C Adjustable 7.5A 5-Pin TO-247 MIC29502WU MIC29503BT MIC29503WT MIC29503BU MIC29503WU (4) MIC29750-3.3BWT (4) MIC29750-5.0BWT (4) Contact Factory Contact Factory (4) Contact Factory MIC29751-5.0BWT MIC29752BWT Contact Factory (4) MIC29751-3.3BWT Package –40°C to +125°C MIC29501-3.3BT MIC29502BU Current (2) MIC29500-5.0WT MIC29501-5.0BT Voltage (2) MIC29500-5.0BT MIC29501-3.3BU Junction Temperature (1) Range MIC29752WWT Note: 4. Not recommended for design. December 2012 3 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Pin Configuration 3-Pin TO-220 (T) MIC29150/29300/29500 5-Pin TO-220 Fixed Voltage (T) MIC29151/29301/29501/29751 5-Pin TO-220 Adjustable Voltage (T) MIC29152/29302/29502 5-Pin TO-220 Adjustable with Flag (T) MIC29153/29303/29503 3-Pin TO-247 (WT) MIC29750 5-Pin TO-247 Fixed Voltage (WT) MIC29751 December 2012 4 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Pin Configuration (Continued) 2 5-Pin TO-247 Adjustable Voltage (WT) MIC29752 3-Pin TO-263 (D Pak) (UT) MIC29150/29300 2 2 5-Pin TO-263 (D Pak) Fixed Voltage (U) MIC29151/29301/29501 5-Pin TO-263 (D Pak) Adjustable Voltage (U) MIC29302/29502 2 5-Pin TO-263 (D Pak) Adjustable with Flag (U) MIC29153/29303/29503 December 2012 5-Pin TO-252 (D-Pak) Adjustable Voltage (D) MIC29152 5 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Pin Description Pin Number TO-220 TO-247 TO-263 Pin Name 1 INPUT: Supplies the current to the output power device. 2 GND: TAB is also connected internally to the IC’s ground on D-PAK. 3 OUTPUT: The regulator output voltage. Pin Description Pin Number Fixed TO-220 TO-247 TO-263 Pin Number Adjustable TO-220 TO-247 TO-252 TO-263 Pin Number Adj. with Flag TO-220 TO-247 TO-263 1 1 — ENABLE: CMOS compatible control input. Logic high = enable, logic low = shutdown. 2 2 2 INPUT: Supplies the current to the output power device 3, TAB 3, TAB 3, TAB 4 4 4 OUTPUT: The regulator output voltage — 5 5 ADJUST: Adjustable regulator feedback input that connects to the resistor voltage divider that is placed from OUTPUT to GND in order to set the output voltage. 5 — 1 FLAG: Active low error flag output signal that indicates an output fault condition December 2012 Pin Name GND: TAB is also connected internally to the IC’s ground on D-PAK. 6 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Absolute Maximum Ratings(1) Operating Ratings(2) (1) Input Supply Voltage (VIN) ........................... –20V to +60V Enable Input Voltage (VEN) ................................ –0.3V to VIN Lead Temperature (soldering, 5sec.) ......................... 260°C Power Dissipation ..................................... Internally Limited Storage Temperature Range .................... –65°C to +150°C ESD Rating.................................................................Note 3 Operating Junction Temperature .............. –40°C to +125°C Maximum Operating Input Voltage ................................ 26V Package Thermal Resistance TO-220 (θJC)......................................................... 2°C/W TO-263 (θJC)......................................................... 2°C/W TO-247 (θJC) ..................................................... 1.5°C/W TO-252 (θJC)......................................................... 3°C/W TO-252 (θJA) ...................................................... 56°C/W Electrical Characteristics(4, 13) VIN = VOUT + 1V; IOUT = 10mA; TJ = 25°C. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Output Voltage Condition Min. IOUT = 10mA 10mA ≤ IOUT ≤ IFL, (VOUT + 1V) ≤ VIN ≤26V Line Regulation IOUT = 10mA, (VOUT + 1V) ≤ VIN ≤26V Load Regulation VIN = VOUT + 1V, 10mA ≤ IOUT ≤ 1.5A ∆VO ∆T (5,9) (5) Typ. Max. –1 1 –2 2 Units % 0.06 0.5 % 0.2 1 % 20 100 ppm/°C 80 220 350 80 250 370 125 250 370 80 270 425 200 (9) Output Voltage Temperature Coefficient. ∆VOUT = −1% MIC29150 (6) MIC29300 Dropout Voltage MIC29500 MIC29750 IOUT = 100mA IOUT = 750mA IOUT = 1.5A IOUT = 100mA IOUT = 1.5A IOUT = 3A IOUT = 250mA IOUT = 2.5A IOUT = 5A IOUT = 250mA IOUT = 4A IOUT = 7.5A 600 175 600 250 mV 600 200 750 Notes: 1. Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle (≤1%). The maximum continuous supply voltage is 26V. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. 4. Specification for packaged product only. 5. Full load current (IFL) is defined as 1.5A for the MIC29150, 3A for the MIC29300, 5A for the MIC29500, and 7.5A for the MIC29750 families. 6. Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its normal value with VOUT + 1V applied to VIN. 7. VIN = VOUT (nominal) + 1V. For example, use VIN = 4.3V for a 3.3V regulator or use 6V for a 5V regulator. Employ pulse-testing procedures to pin current. 8. 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. 9. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. 10. 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 a200mA load pulse at VIN = 20V (a 4W pulse) for T = 10ms. 11. 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 95mV x 5V/1.240V = 384mV. 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. 12. VEN ≤ 0.8V and VIN ≤ 26V, VOUT = 0. 13. 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. December 2012 7 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Electrical Characteristics(4, 13) (Continued) VIN = VOUT + 1V; IOUT = 10mA; TJ = 25°C. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Condition Min. MIC29150 MIC29500 MIC29750 Note 8 IGRNDDOGround Pin Current at Dropout Current Limit VIN = 0.5V less than specified VOUT × IOUT = 10mA MIC29150 MIC29300 MIC29500 MIC29750 (7) en, Output Noise Voltage (10Hz to 100kHz) IL = 100mA CL = 10µF CL = 33µF Ground Current in Shutdown MIC29150/1/2/3 only VEN = 0.4V Units 20 35 mA 50 75 0.9 1.7 2.1 3.1 VOUT = 0V (7) VOUT = 0V (7) VOUT = 0V (7) VOUT = 0V MIC29150 MIC29300 MIC29500 MIC29750 Max. 8 22 10 37 15 70 35 120 IOUT = 750mA, VIN = VOUT + 1V IOUT = 1.5A IOUT = 1.5A, VIN = VOUT + 1V IOUT = 3A IOUT = 2.5A, VIN = VOUT + 1V IOUT = 5A IOUT = 4A, VIN = VOUT + 1V IOUT = 7.5A MIC29300 Ground Current Typ. mA 3.5 5.0 10.0 15 2.1 4.5 7.5 9.5 400 260 A µV (rms) 2 10 30 µA Reference − MIC29xx2/MIC29xx3 Reference Voltage 1.228 1.215 Reference Voltage 1.203 Adjust Pin Bias Current Reference Voltage Temperature Coefficient 1.240 40 Note 10 Adjust Pin Bias Current Temperature Coefficient 1.252 1.265 V 1.277 V 80 120 nA 20 ppm/°C 0.1 nA/°C Flag Output (Error Comparator) − MIC29xx1/29xx3 Output Leakage Current VOH = 26V 0.01 Output Low Voltage Device set for 5V, VIN = 4.5V IOL = 250µA 220 Upper Threshold Voltage Device set for 5V (11) Lower Threshold Voltage Device set for 5V (11) 75 Hysteresis Device set for 5V (11) 15 December 2012 40 25 8 1.00 2.00 µA 300 400 mV 60 mV 95 140 mV mV M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Electrical Characteristics(4, 13) (Continued) VIN = VOUT + 1V; IOUT = 10mA; TJ = 25°C. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Condition Min. Typ. Max. Units ENABLE Input − MIC29xx1/MIC29xx2 Input Logic Voltage Low (OFF) High (ON) 0.8 2.4 VEN = 26V 100 Enable Pin Input Current VEN = 0.8V Regulator Output Current in Shutdown Note 12 December 2012 2 4 0.7 10 9 600 750 500 V µA µA M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Typical Characteristics (MIC2915x) December 2012 10 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Typical Characteristics (MIC2915x) (Continued) December 2012 11 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Typical Characteristics (MIC2930x) December 2012 12 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Typical Characteristics (MIC2930x) (Continued) December 2012 13 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Typical Characteristics (MIC2950x) December 2012 14 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Typical Characteristics (MIC2950x) (Continued) December 2012 15 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Typical Characteristics − MIC2975x December 2012 16 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Typical Characteristics − MIC2975x (Continued) December 2012 17 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Functional Diagram December 2012 18 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Application Information 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: The MIC29150/29300/29500/29750 are highperformance low-dropout voltage regulators suitable for all moderate to high-current voltage regulator applications. Their 350mV to 425mV typical dropout voltage at full load make them especially valuable in battery powered systems and as high efficiency noise filters in “post-regulator” applications. Unlike older NPNpass 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 these devices is limited merely by the low VCE saturation voltage. A trade-off for the low-dropout voltage is a varying base ® driver requirement. But Micrel’s Super ßeta PNP process reduces this drive requirement to merely 1% of the load current. The MIC29150/29300/29500/29750 family of regulators are fully protected from damage due to fault conditions. Current limiting is provided. This limiting is linear; output current under overload conditions is constant. Thermal shutdown disables the device when the die temperature exceeds the 125°C maximum safe operating temperature. Line transient protection allows device (and load) survival even when the input voltage spikes between –20V and +60V. When the input voltage exceeds approximately 32V, the over voltage sensor disables the regulator. The output structure of these regulators allows voltages in excess of the desired output voltage to be applied without reverse current flow. MIC29xx1 and MIC29xx2 versions offer a logic level ON/OFF control: when disabled, the devices draw nearly zero current. An additional feature of this regulator family is a common pinout: a design’s current requirement may change up or down yet use the same board layout, as all of these regulators have identical pinouts. • • • • First, we calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet. PD = IOUT (1.01 VIN − VOUT ) OUT IN θSA = TJMAX − TA − (θJC + θCS ) PD Eq. 2 where TJMAX ≤ 125°C and θCS is between 0 and 2°C/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 Micrel Super ® ßeta PNP regulators allow very significant reductions in regulator power dissipation and the associated heat sink without compromising performance. When this technique is employed, a capacitor of at least 0.1µF is needed directly between the input and regulator ground. Please refer to Application Note 9 and Application Hint 17 for further details and examples on thermal design and heat sink specification. With no heat sink in the application, calculate the junction temperature to determine the maximum power dissipation that will be allowed before exceeding the maximum junction temperature of the MIC29152. The maximum power allowed can be calculated using the thermal resistance (θJA) of the D-Pak adhering to the following criteria for the PCB design: 2 oz. copper and 2 100mm copper area for the MIC29152. VOUT GND Figure 3. Linear Regulators Require Only Two Capacitors for Operation December 2012 Eq. 1 where the ground current is approximated by 1% of IOUT. Then the heat sink thermal resistance is determined with Equation 2: MIC29XXX VIN Maximum ambient temperature, TA Output Current, IOUT Output Voltage, VOUT Input Voltage, VIN 19 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 For example, given an expected maximum ambient temperature (TA) of 75°C with VIN = 3.3V, VOUT = 2.5V, and IOUT = 1.5A, first calculate the expected PD using Equation 3: Where the regulator is powered from a source with high AC impedance, a 0.1µF capacitor connected between Input and GND is recommended. This capacitor should have good characteristics to above 250kHz. Minimum Load Current The MIC29150–29750 regulators are specified between finite loads. If the output current is too small, leakage currents dominate and the output voltage rises. The following minimum load current swamps any expected leakage current across the operating temperature range, as shown in Table 2: PD=(3.3V–2.5V)1.5A–(3.3V)(0.016A)=1.1472W Eq. 3 Next, calcualte the junction temperature for the expected power dissipation. TJ=(θJA×PD)+TA=(56°C/W×1.1472W)+75°C =139.24°C Device Minimum Load MIC29150 Eq. 4 Now determine the maximum power dissipation allowed that would not exceed the IC’s maximum junction temperature (125°C) without the useof a heat sink by: 5mA MIC29300 7mA MIC29500 10mA MIC29750 10mA Table 2. Minimum Load Currents PD(MAX) = (TJ(MAX)–TA)/θJA Adjustable Regulator Design The adjustable regulator versions, MIC29xx2 and MIC29xx3, allow programming the output voltage anywhere between 1.25V and the 25V. Two resistors are used. The resistor values are calculated by Equation 6: = (125°C–75°C)/(56°C/W) = 0.893W Eq. 5 Capacitor Requirements For stability and minimum output noise, a capacitor on the regulator output is necessary. The value of this capacitor is dependent upon the output current; lower currents allow smaller capacitors. The MIC29150/29300/29500/29750 regulators are stable with the following minimum capacitor values at full load, as noted in Table 1: Device V R 1 = R 2 × OUT − 1 1.240 where VOUT is the desired output voltage. Figure 4 shows component definition. Applications with widely varying load currents may scale the resistors to draw the minimum load current required for proper operation (see “Minimum Load Current” sub-section). Full Load Capacitor MIC29150 10µF MIC29300 10µF MIC29500 10µF MIC29750 22µF Eq. 6 Table 1. Minimum Capacitor Values 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. December 2012 20 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 MIC29152BT VIN VOUT R1 10µF 22µF R2 Figure 4. Adjustable Regulator with Resistors Error Flag MIC29xx1 and MIC29xx3 versions feature an Error Flag, which looks at the output voltage and signals an error condition when this voltage drops 5% below its expected value. The error flag is an open-collector output that pulls low under fault conditions. It may sink 10mA. Low output voltage signifies a number of possible problems, including an overcurrent fault (the device is in current limit) and low input voltage. The flag output is inoperative during overtemperature shutdown conditions. Enable Input MIC29xx1 and MIC29xx2 versions feature an enable (EN) input that allows ON/OFF control of the device. Special design allows “zero” current drain when the device is disabled—only microamperes of leakage current flows. The EN input has TTL/CMOS compatible thresholds for simple interfacing with logic, or may be directly tied to ≤30V. Enabling the regulator requires approximately 20µA of current. December 2012 21 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Package Information(1) 3-Pin TO-220 (T) 5-Pin TO-220 (T) Note: 1. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com. December 2012 22 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Package Information(1) (Continued) 5-Pin TO-263 (U) 3-Pin TO-263 (U) December 2012 23 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Package Information(1) (Continued) 5-Pin TO-247 (WT) 3-Pin TO-247 (WT) December 2012 24 M9999-122012-B Micrel, Inc. MIC29150/29300/29500/29750 Package Information(1) (Continued) 5-Pin TO-252 (D) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. 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. © 2012 Micrel, Incorporated. December 2012 25 M9999-122012-B