MIC29150/29300/29500/29750 High-Current Low-Dropout Regulators
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MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
High-Current Low-Dropout Regulators
General Description
MIC29150/29300/29500/29750 high current, high accuracy, low-dropout voltage regulators. Using Micrel's proprietary Super PNPprocess with pass element, these regulators feature 300mV 370mV (full load) dropout voltages very ground current. Designed high current loads, these devices also find applications lower current, extremely dropout-critical systems, where their tiny dropout voltage ground current values important attributes. MIC29150/29300/29500/29750 fully protected against overcurrent faults, reversed input polarity, reversed lead insertion, overtemperature operation, positive negative transient voltage spikes. Five fixed voltage versions feature logic level ON/OFF control error flag which signals whenever output falls regulation. Flagged states include input voltage (dropout), output current limit, overtemperature shutdown, extremely high voltage spikes input. MIC29xx1 MIC29xx2, ENABLE tied required ON/OFF control. MIC29150/29300/29500 available 5-pin TO-220 surface mount TO-263 packages. MIC29750 7.5A regulators available 5-pin TO-247 packages.
applications with input voltage below, MIC3715x LDOs.
Features
High current capability MIC29150/29151/29152/29153 1.5A MIC29300/29301/29302/29303 MIC29500/29501/29502/29503 MIC29750/29751/29752 7.5A Low-dropout voltage 350mV Full Load ground current Accurate guaranteed tolerance Extremely fast transient response Reverse-battery "Load Dump" protection Zero-current shutdown mode (5-pin versions) Error flag signals output out-of-regulation (5-pin versions) Also characterized smaller loads with industryleading performance specifications Fixed voltage adjustable versions
Applications
Battery powered equipment High-efficiency "Green" computer systems Automotive electronics High-efficiency linear lower supplies High-efficiency lost-regulator switching supply
Typical Application
TO-247-3 Lead
TO-220-5 Lead TO-263-3 Lead
TO-263-5 Lead
MIC29150/29300BU/WU
MIC29151/29152/29153BU/WU MIC29301/29302/29303BU/WU MIC29501/29502/29503BU/WU
MIC29750BWT/WWT
MIC29151/29152/29153BT/WT MIC29301/29302/29303BT/WT MIC29501/29502/29503BT/WT
TO-220-3 Lead
TO-247-5 Lead
Pinout
devices, grounded.
MIC29150/29300/29500/29750 Three Terminal Devices: Input, Ground, Output MIC29151/29301/29501/29751 Five Terminal Fixed Voltage Devices: Enable, Input, Ground, Output, Flag MIC29751/29752BWT/WWT MIC29152/29302/29502/29752 Adjustable with ON/OFF Control: Enable, Input, Ground, Output, Adjust MIC29150/29300/29500BT/WT Super trademark Micrel, Inc. Micrel, Inc. 2180 Fortune Drive Jose, 95131 (408) 944-0800 (408) 474-1000 http://www.micrel.com MIC29153/29303/29503/ Adjustable with Flag: Flag, Input, Ground, Output, Adjust
November 2005
M9999-111005
MIC29150/29300/29500/29750
Ordering Information
Part Number Standard RoHS Compliant** MIC29150-3.3BT MIC29150-3.3WT** MIC29150-3.3BU MIC29150-3.3WU** MIC29150-5.0BT MIC29150-5.0WT** MIC29150-5.0BU MIC29150-5.0WU** 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 MIC29151-12WT** MIC29151-12BU MIC29151-12WU** MIC29152BT MIC29152WT** MIC29152BU MIC29152WU** MIC29153BT*** Contact Factory MIC29153BU*** Contact Factory MIC29300-3.3BT MIC29300-3.3WT** MIC29300-3.3BU MIC29300-3.3WU** MIC29300-5.0BT MIC29300-5.0WT** MIC29300-5.0BU MIC29300-5.0WU** 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 MIC29301-12WT** MIC29301-12BU MIC29301-12WU** MIC29302BT MIC29302WT** MIC29302BU MIC29302WU** MIC29303BT MIC29303WT** MIC29303BU MIC29303WU** MIC29500-3.3BT MIC29500-3.3WT** MIC29500-5.0BT MIC29500-5.0WT** MIC29501-3.3BT MIC29501-3.3WT** MIC29501-3.3BU MIC29501-3.3WU** MIC29501-5.0BT MIC29501-5.0WT** MIC29501-5.0BU MIC29501-5.0WU** MIC29502BT MIC29502WT** MIC29502BU MIC29502WU** MIC29503BT MIC29503WT** MIC29503BU MIC29503WU** MIC29750-3.3BWT Contact Factory MIC29750-5.0BWT Contact Factory MIC29751-3.3BWT Contact Factory MIC29751-5.0BWT Contact Factory MIC29752BWT MIC29752WWT**
*Junction Temperature **RoHS compliant with `high-melting solder' exemption. ***Special Order, Contact Factory
Temp. Range* -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C
Voltage Adj. Adj. Adj. Adj. Adj. Adj. Adj. Adj. Adj. Adj. Adj. Adj. Adj.
Current 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 3.0A 5.0A 5.0A 5.0A 5.0A 5.0A 5.0A 5.0A 5.0A 5.0A 5.0A 7.5A 7.5A 7.5A 7.5A 7.5A
Package TO-220-3 TO-263-3 TO-220-3 TO-263-3 TO-220-3 TO-263-3 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-3 TO-263-3 TO-220-3 TO-263-3 TO-220-3 TO-263-3 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-3 TO-220-3 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-247-3 TO-247-3 TO-247-5 TO-247-5 TO-247-5
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Absolute Maximum Ratings
Power Dissipation Internally Limited Lead Temperature (Soldering, seconds) 260°C Storage Temperature Range -65°C +150°C Input Supply Voltage(1) -20V +60V
Operating Ratings
Operating Junction Temperature -40°C +125°C Maximum Operating Input Voltage 2.5V TO-220 (JC) 2°C/W TO-263 (JC) 2°C/W TO-247 (JC) 1.5°C/W
Electrical Characteristics(12)
measures 25°C unless otherwise noted. Bold values guaranteed across operating temperature range. Adjustable versions programmed 5.0V.
Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage
Condition 10mA 10mA IFL, (VOUT
(2,6)
Units ppm/°C
10mA, (VOUT Output Voltage Temperature Coef. VOUT MIC29150 MIC29300 MIC29500 MIC29750
0.06
VOUT 10mA IOUT IFULL LOAD
Ground Current
MIC29150 MIC29300 MIC29500 MIC29750
100mA 750mA 1.5A 100mA 1.5A 250mA 2.5A 250mA 7.5A
IGRNDDOGround Current Droupout
0.5V less than specified VOUT IOUT 10mA MIC29150 MIC29300 MIC29500 MIC29750 MIC29150 MIC29300 MIC29500 MIC29750 10µF 33µF MIC29150/1/2/3 only 0.4V VOUT VOUT VOUT VOUT
750mA, VOUT 1.5A 1.5A, VOUT 2.5A, VOUT VOUT 7.5A
10.0 (rms)
Current Limit
Output Noise Voltage (10Hz 100kHz) 100mA Ground Current Shutdown November 2005
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Micrel, Inc. Parameter Reference Reference Voltage Reference Voltage Adjust Bias Current Reference Voltage Temperature Coefficient Adjust Bias Current Temperature Coefficient Flag Output (Error Comparator) MIC29xx1/29xx3 Output Leakage Current Output Voltage Device 4.5V 250µA
MIC29150/29300/29500/29750 Condition MIC29xx2/MIC29xx3 1.228 1.215 1.203 1.240 1.252 1.265 1.277 ppm/°C nA/°C Units
0.01
1.00 2.00
Upper Threshold Voltage Device Lower Threshold Voltage Device Hysteresis ENABLE Input Input Logic Voltage (OFF) High (ON) Enable Input Current Regulator Output Current Shutdown
Notes:
Device MIC29xx1/MIC29xx2
0.8V
(10)
Maximum positive supply voltage must limited duration (<100msec) duty cycle (1%). maximum continuous supply voltage 26V. Dropout voltage defined input-to-output differential when output voltage drops normal value with VOUT applied VIN.
(nominal)
Full load current (IFL) defined 1.5A MIC29150, MIC29300, MIC29500, 7.5A MIC29750 families.
VOUT current.
example, 4.3V 3.3V regulator regulator. Employ pulse-testing precedures
Ground current regulator quiescent current. total current drawn from source load current plus ground current. Output voltage temperature coefficient defined worst case voltage change divided total temperature range. Thermal regulation defined change output voltage time after change power siddipation applied, excluding load line regulation effects. Specifications a200mA load pulse pulse) 10ms.
When used dual supply systems where regulator load returned negative supply, output voltage must diode clampled ground. Specification packaged product only.
0.8V 26V, VOUT
Comparator thresholds expressed terms voltage differential Adjust terminal below nominal reference voltage measured input. express these thresholds terms output voltage change, multiply error amplifier gain VOUT/VREF R2)/R2. example, programmed output voltage Error output guaranteed when output drops 95mV 5V/1.240V 384mV. Thresholds remain constant percent VOUT VOUT varied, with dropout warning occurring typically below nominal, 7.7% guaranteed.
VREF VOUT (VIN -1V), 2.3V 26V, 10mA IFL, MAX.
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Block Diagram
O.V. LIMIT FLAG 1.180V Reference 1.240V
Thermal Shutdown
Feedback network fixed versions only Adjustable version only
Typical Applications
MIC29500-3.3
3.3V 47µF
1.240V R2)]
Figure Fixed Output Voltage
Figure Adjustable output Voltage Configuration. best results, total series resistance should small enough pass minimum regulator load current.
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Typical Characteristics MIC2915x
MIC2915x Dropout Voltage Output Current
DROPOUT VOLTAGE
DROPOUT VOLTAGE (mV)
MIC2915x Dropout Voltage Temperature
OUTPUT VOLTAGE
MIC29150-5.0 Dropout Characteristics
OUTPUT CURRENT
IOUT 10mA
IOUT 1.5A
ILOAD 1.5A
TEMPERATURE (°C)
INPUT VOLTAGE
GROUND CURRENT (mA)
MIC2915x Ground Current Output Current
GROUND CURRENT (mA)
MIC2915x Ground Current Supply Voltage
GROUND CURRENT (mA)
VOUT ILOAD 10mA
MIC2915x Ground Current Supply Voltage
MIC29152 IOUT 1.5A
OUTPUT CURRENT
SUPPLY VOLTAGE
SUPPLY VOLTAGE
GROUND CURRENT (µA)
MIC2915x Ground Current Temperature
GROUND CURRENT (mA)
MIC2915x Ground Current Temperature
GROUND CURRENT (mA)
MIC2915x Ground Current Temperature
TEMPERATURE (°C)
ILOAD 10mA
ILOAD 1.5A
ILOAD 250mA
TEMPERATURE (°C)
TEMPERATURE (°C)
3.40
OUTPUT VOLTAGE
MIC29150-3.3 Output Voltage Temperature
CURRENT
MIC29150-3.3 Short Circuit Current Temperature
GROUND CURRENT (µA)
MIC2915x Ground Current Input Voltage
RLOAD VOUT
3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22
DEVICES
TEMPERATURE (°C)
VOUT
3.20 TEMPERATURE (°C)
-0.2
INPUT VOLTAGE
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OUTPUT (mV)
ENABLE CURRENT (µA)
TEMPERATURE (°C)
-200 -0.5
COUT
OUTPUT (mV)
MIC29151-xx/2 Enable Current Temperature
MIC2915x Load Transient
-100 -200 -0.5
MIC2915x Load Transient
COUT
OUTPUT
ILOAD 10mA
OUTPUT
ILOAD 10mA
TIME (µs)
TIME (µs)
MIC29152/3 Adjust Current Temperature
OUTPUT (mV)
ADJUST CURRENT (nA)
ILOAD 10mA
COUT
OUTPUT (mV)
MIC2915x Line Transient
MIC2915x Line Transient
COUT
INPUT
TEMPERATURE (°C)
-0.2 TIME (µs)
INPUT
ILOAD 10mA
ILOAD 10mA
-0.2 TIME (µs)
OUTPUT IMPEDANCE 0.01 0.001
MIC2915x Output Impedance Frequency
100x100
1x103
100x103
10x100
FREQUENCY (Hz)
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1x106
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Typical Characteristics MIC2930x
MIC2930x Dropout Voltage Output Current
DROPOUT VOLTAGE
0.40
DROPOUT VOLTAGE
MIC2930x Dropout Voltage Temperature
OUTPUT VOLTAGE
MIC29300-3.3 Dropout Characteristics
0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00
OUTPUT CURRENT
ILOAD 10mA
ILOAD
ILOAD
TEMPERATURE (°C)
INPUT VOLTAGE
GROUND CURRENT (mA)
MIC2930x Ground Current Output Current
GROUND CURRENT (mA)
MIC2930x Ground Current Supply Voltage
GROUND CURRENT (mA)
FIXED 3.3V DEVICE RLOAD
MIC2930x Ground Current Supply Voltage
IXED 3.3V IOUT
OUTPUT CURRENT
SUPPLY VOLTAGE
SUPPLY VOLTAGE
GROUND CURRENT (mA)
MIC2930x Ground Current Temperature
GROUND CURRENT (mA)
MIC2930x Ground Current Temperature
GROUND CURRENT (mA)
MIC2930x Ground Current Temperature
TEMPERATURE (°C)
IOUT 10mA
IOUT 250mA
IOUT
TEMPERATURE (°C)
TEMPERATURE (°C)
3.40
OUTPUT VOLTAGE
MIC29300-3.3 Output Voltage Temperature
CURRENT
MIC29300-5.0 Short Circuit Current Temperature
GROUND CURRENT (mA)
MIC2930x Ground Current Input Voltage
3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22
DEVICES
TEMPERATURE (°C)
VOUT
3.20 TEMPERATURE (°C)
-0.5
RLOAD
INPUT VOLTAGE
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OUTPUT OUTPUT (mV)
ENABLE CURRENT (µA)
TEMPERATURE (°C)
COUT
OUTPUT OUTPUT (mV)
MIC29301-xx/2 Enable Current Temperature
MIC2930x Load Transient
MIC2930x Load Transient
COUT
-200
ILOAD 10mA
TIME (µs)
-100
ILOAD 10mA
TIME (µs)
OUTPUT (mV)
ADJUST CURRENT (nA)
TEMPERATURE (°C)
ILOAD 10mA
COUT
OUTPUT (mV)
MIC29302/3 Adjust Current Temperature
MIC2930x Line Transient
MIC2930x Line Transient
COUT
INPUT
-0.2 TIME (µs)
INPUT
ILOAD 10mA
ILOAD 10mA
-0.2 TIME (µs)
OUTPUT IMPEDANCE 0.01 0.001
MIC2930x Output Impedance Frequency
100x100
1x103
100x103
10x100
FREQUENCY (Hz)
November 2005
10x103
1x106
M9999-111005
MIC29150/29300/29500/29750
Typical Characteristics MIC2950x
MIC2950x Dropout Voltage Output Current
DROPOUT VOLTAGE
DROPOUT VOLTAGE
MIC2950x Dropout Voltage Temperature
OUTPUT VOLTAGE
MIC29500-3.3 Dropout Characteristics
OUTPUT CURRENT
ILOAD 10mA
ILOAD
ILOAD
TEMPERATURE (°C)
INPUT VOLTAGE
MIC2950x Ground Current Output Current
GROUND CURRENT (mA)
MIC2950x Ground Current Supply Voltage
GROUND CURRENT (mA)
FIXED 3.3V VERSIONS RLOAD
MIC2950x Ground Current Supply Voltage
GROUND CURRENT (mA)
OUTPUT CURRENT
FIXED 3.3V VERSION ILOAD
SUPPLY VOLTAGE
SUPPLY VOLTAGE
GROUND CURRENT (mA)
MIC2950x Ground Current Temperature
GROUND CURRENT (mA)
MIC2950x Ground Current Temperature
GROUND CURRENT (mA)
MIC2950x Ground Current Temperature
TEMPERATURE (°C)
IOUT
IOUT 10mA
IOUT 500mA
TEMPERATURE (°C)
TEMPERATURE (°C)
3.40
OUTPUT VOLTAGE
MIC29500-3.3 Output Voltage Temperature
CURRENT
MIC2950x-5.0 Short Circuit Current Temperature
GROUND CURRENT (mA)
MIC2950x Ground Current Input Voltage
3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22
DEVICES
VOUT
3.20 TEMPERATURE (°C)
TEMPERATURE (°C)
-0.5
RLOAD
INPUT VOLTAGE
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OUTPUT (mV)
ENABLE CURRENT (µA)
TEMPERATURE (°C)
1000 -500
COUT
OUTPUT (mV)
MIC29501-xx/2 Enable Current Temperature
1500
MIC2950x Load Transient
-100
MIC2950x Load Transient
COUT
OUTPUT
ILOAD 10mA
OUTPUT
ILOAD 10mA
TIME (µs)
TIME (µs)
OUTPUT (mV)
ADJUST CURRENT (nA)
ILOAD 10mA
-100
COUT
OUTPUT (mV)
MIC29502/3 Adjust Current Temperature
MIC2950x Line Transient
MIC2950x Line Transient
COUT
INPUT
TEMPERATURE (°C)
-0.2 TIME (µs)
INPUT
ILOAD 10mA
ILOAD 10mA
-0.2 TIME (µs)
OUTPUT IMPEDANCE 0.01 0.001
MIC2950x Output Impedance Frequency
100x100
1x103
100x103
10x100
FREQUENCY (Hz)
November 2005
10x103
1x106
M9999-111005
MIC29150/29300/29500/29750
Typical Characteristics MIC2975x
MIC2975x Dropout Voltage Output Current
DROPOUT VOLTAGE
MIC2975x Dropout Voltage Temperature
OUTPUT VOLTAGE
MIC29750-3.3 Dropout Characteristics
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT
ILOAD 10mA
ILOAD 7.5A
TEMPERATURE (°C)
INPUT VOLTAGE
GROUND CURRENT (mA)
MIC2975x Ground Current Output Current
GROUND CURRENT (mA)
MIC2975x Ground Current Supply Voltage
GROUND CURRENT (mA)
FIXED 3.3V VERSION IOUT 10mA
MIC2975x Ground Current Supply Voltage
OUTPUT CURRENT
FIXED 3.3V VERSION ILOAD 7.5A
SUPPLY VOLTAGE
SUPPLY VOLTAGE
GROUND CURRENT (mA)
MIC2975x Ground Current Temperature
GROUND CURRENT (mA)
MIC2975x Ground Current Temperature
GROUND CURRENT (mA)
MIC2975x Ground Current Temperature
TEMPERATURE (°C)
IOUT 10mA
IOUT 7.5A
IOUT 250mA
TEMPERATURE (°C)
TEMPERATURE (°C)
3.40 3.38
OUTPUT VOLTAGE
MIC29750-3.3 Output Voltage Temperature
CURRENT
3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22
DEVICES
3.20 TEMPERATURE (°C)
VOUT TEMPERATURE (°C)
MIC29750-5.0 Short Circuit Current Temperature
GROUND CURRENT (mA)
MIC2975x Ground Current Input Voltage
-0.5 INPUT VOLTAGE
RLOAD
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OUTPUT (mV)
ENABLE CURRENT (µA)
TEMPERATURE (°C)
1000 -500 10.0 -2.5
COUT
OUTPUT (mV)
MIC29751-xx/2 Enable Current Temperature
1500
MIC2975x Load Transient
-100 -200 10.0 -2.5
MIC2975x Load Transient
COUT
OUTPUT
ILOAD 10mA
OUTPUT
ILOAD 10mA
TIME (µs)
TIME (µs)
OUTPUT (mV)
ADJUST CURRENT (nA)
ILOAD 10mA
-100
COUT
OUTPUT (mV)
MIC29752/3 Adjust Current Temperature
MIC2975x Line Transient
MIC2975x Line Transient
COUT
INPUT
TEMPERATURE (°C)
-0.2 TIME (µs)
INPUT
ILOAD 10mA
ILOAD 10mA
-0.2 TIME (µs)
OUTPUT IMPEDANCE 0.01 0.001
MIC2975x Output Impedance Frequency
100x100
1x103
100x103
10x100
FREQUENCY (Hz)
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1x106
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MIC29150/29300/29500/29750 First, calculate power dissipation regulator fromthese numbers device parameters from this datasheet. IOUT 1.01
Applications Information
MIC29150/29300/29500/29750 high performance low-dropout voltage regulators suitable moderate high-current voltage regulator applications. Their 300mV to400mV dropout voltage full load make them especiallyvaluable battery powered systems high efficiency noise filters "post-regulator" applications. Unlike older NPN-pass transistor designs, where minimum dropout voltage limited base-emitter voltage drop collector-emitter saturation voltage, dropout performance output these devices limited merely saturation voltage. trade-off low-dropout voltage varying base driver equirement. Micrel's Super PNPprocess reduces this drive requirement merely load current. MIC29150-29750 family regulators fully protected from damage fault conditions. Current limiting isprovided. This limiting linear; output current under overload conditions constant. Thermal shutdown disables device when temperature exceeds 125°C maximum safe operating temperature. Transient protection allows device (and load) survival even when input voltage spikes between -20V +60V. When input voltage exceeds about 40V, over voltage sensor temporarily disables regulator. output structure these regulatorsallows voltages excess desired output voltage applied without reverse current flow. MIC29xx1 MIC29xx2versions offer logic level ON/OFF control: when disabled,the devices draw nearly zero current. additional feature this regulator family commonpinout: design's current requirement change ordown same board layout, these regulatorshave identical pinouts.
VOUT
Where ground current approximated IOUT. Then heat sink thermal resistance determined with thisformula:
Where 125°C between 2°C/W. heat sink significantly reduced applications where minimum input voltage known large compared with dropout voltage. series inputresistor drop excessive voltage distribute heat between this resistor regulator. low-dropout properties Micrel Super regulators allow very significant reductions regulator power dissipation associated heat sink without compromising performance. When this technique employed, capacitor least 0.1µF needed directly between input regulator ground. Please refer Application Note Application Hint further details examples thermal design heat sink specification. Capacitor Requirements stability minimum output noise, capacitor regulator output necessary. value this capacitor dependent upon output current; lower currents allow smaller capacitors. MIC29150-29750 regulators stable with following minimum capacitor values full load: Device Full Load Capacitor MIC29150.10µF MIC29300.10µF MIC29500.10µF MIC29750.22µF This capacitor need expensive type: aluminum electrolytics adequate. fact, extremely capacitors contribute instability. Tantalum capacitors recommended systems where fast load transient response important. Where regulator powered from source with high impedance, 0.1µF capacitor connected between Input recommended. This capacitor should have good characteristics above 250kHz. Minimum Load Current MIC29150-29750 regulators specified between finite loads. output current small, leakage currents dominate output voltage rises. following minimum load current swamps expected leakage current across operating temperature range:
Figure Linear regulators require only capacitorsfor operation.
Thermal Design Linear regulators simple use. most complicated design parameters consider thermal characteristics. Thermal design requires following application-specifi parameters: Maximum ambient temperature, Output Current, IOUT Output Voltage, VOUT Input Voltage,
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Micrel, Inc. Device Minimum Load MIC29150.5mA MIC29300.7mA MIC29500.10mA MIC29750.10mA Adjustable Regulator Design
MIC29150/29300/29500/29750 resistors used. Resistors quite large, because very high input impedance bias current sense comparator: resistor values calculated 1.240 Where desired output voltage. Figure shows component definition. Applications with widely varying load currents scale resistors draw minimum load current required proper operation (see above). Error Flag MIC29xx1 MIC29xx3 versions feature Error Flag,which looks output voltage signals error condition when this voltage drops below expected value. error flag open-collector output that pulls under fault conditions. sink 10mA. output voltage signifies number possible problems, including overcurrent fault (the device current limit) input voltage. flag output inoperative during overtemperature shutdown conditions. Enable Input MIC29xx1 MIC29xx2 versions feature enable (EN) input that allows ON/OFF control device. Special design allows "zero" current drain when device disabled-only microamperes leakage current flows. input TTL/CMOS compatible thresholds simple interfacing with logic, directly tied 30V. Enabling regulator requires approximately 20µA current.
MIC29152BT
10µF 22µF
VOUT
Figure 4.Adjustable Regulator with Resistors adjustable regulator versions, MIC29xx2 MIC29xx3, allow programming output voltage anywhere between 1.25V maximum operating rating family.
November 2005
M9999-111005
MIC29150/29300/29500/29750
Package Information
3-Lead TO-220
5-Lead TO-220
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MIC29150/29300/29500/29750
0.100
3-Lead TO-263
5-Lead TO-263
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MOUNTING HOLE 0.125 (3.175)
0.190 0.21 (4.826 5.334)
0.620 0.640 (15.748 16.256)
0.180 0.200 (4.572 5.080)
0.160 0.180 (4.064 4.572)
0.860 0.880 (21.844 22.352)
Dimensions:
inch (mm)
0.25 (6.350)
0.780 0.820 (19.812 20.828)
0.040 0.060 (1.016 1.524)
0.070 0.090 (1.778 2.286)
0.110 0.130 (2.794 3.302)
0.070 0.090 (1.778 2.286)
0.025 0.03 (0.635 0.889)
0.200 (5.080)
3-Lead TO-247
MOUNTING HOLE 0.140 0.143 (3.56 3.63)
0.185 0.208 (4.70 5.28)
0.620 0.640 (15.75 16.26)
0.180 0.200 (4.57 5.08)
0.242 (6.15 BSC)
0.819 0.844 (20.80 21.44)
0.170 0.216 (4.32 5.49)
Dimensions:
inch (mm)
0.780 0.800 (19.81 20.32)
0.040 0.055 (1.02 1.40)
0.100 (2.54 BSC)
0.080 0.100 (2.03 2.54)
0.016 0.031 (0.41 0.79)
5-Lead TO-247 April 2005
M9999-042705
MIC29150/29300/29500/29750
MICREL INC.
(408) 944-0800 (408) 474-1000 http://www.micrel.com
2180 FORTUNE DRIVE
JOSE, 95131
This information furnished Micrel this data sheet believed accurate reliable. However responsibility assumed Micrel use. Micrel reserves right change circuitry specifications time without notification customer. Micrel Products designed authorized components life support appliances, devices systems where malfunction product reasonably expected result personal injury. Life support devices systems devices systems that intended surgical implant into body support sustain life, whose failure perform reasonably expected result significant injury user. Purchaser's sale Micrel Products life support appliances, devices systems Purchaser's risk Purchaser agrees fully indemnify Micrel damages resulting from such sale. 2003 Micrel Incorporated
November 2005
M9999-111005
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