family, 3-terminal regulator, easy used with protection features that

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family, 3-terminal regulator, easy used with protection features that expected those high performance voltage regulators. This device provides short-circuit protection, thermal shutdown protection internal current limiting protection against overload condition that would create excessive junction temperatures.
Protection Diodes
normal operation, family needs protection diodes. internal diode between input output pins family handle microsecond surge currents. Even with large output capacitance, very difficult those values surge current normal operation. damage will occur, unless high value output capacitors input instantaneously shorted ground. crowbar circuit input family generate those kinds currents diode from output-to-input then recommended. Normal power supply cycling even plugging unplugging system will generate current large enough damage (see Figure
AIC1086 Topology
(1)Current Limit Protection
Like other power regulators family safe area protection. current limit protection will occur while heavy output loading current keep output current within safe operating region same time, output voltage decreases lower voltage. family protection designed provide output normal current limit overcurrent downstream devices protect from being damaged
Function block diagram
VOUT
COUT
Figure AIC1086 protection diodes diagram
Ripple Rejection
family recommended applications that require improved ripple rejection. connect bypass capacitor from Figure AIC1086 current limit test Upper: output voltage (1V/div) Lower: output current (2A/div) family ground will reduce output ripple (see Figure3). bypass capacitor prevents output ripple from being amplified output voltage loading current increased. ANALOG INTEGRATIONS CORPORATION
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function defined output ripple frequency CADJ bypass capacitor (For figure When ripple rejection increases output capacitor increases, output ripple will reduced. more information, please refer family datasheet. family unable provide true remote load sensing. resistance wire connecting regulator load will limit load regulation. Please refer datasheet measurement. Figure When fixed regulator used, load should connected output terminal positive side connected ground terminal negative side. output voltage measured followed: Vout (RS1 Figure When adjustable regulator used, load should connected output terminal positive side connected ground terminal negative side. output
CADJ COUT
Function block diagram
AIC1086 Topology VOUT
voltage measured followed: (RS1 RS2) Load regulation measure circuit's Vref ability maintain specified output voltage under different load conditions.
Figure AIC1086 bypass capacitor (CADJ)
Cout=10uF, Cout= 1uF, Cout= 1uF, Vin=5V
Ripple Rejection (dB) (AIC1722D
Load regulation defined
Vout
Figure shows PMOS voltage regulator. output voltage change given load change (Vout/I) under constant input voltage calculated follows: series pass element,
current gain transconductance error amplifier operating point. Assume that there small output current change (I). change output current causes output voltage change. Vout www.analog.com.tw
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Frequency
Figure 1722D-33 frequency ripple rejection
Load Regulation
Being three-terminal device, ANALOG INTEGRATIONS CORPORATION
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VOUT
equivalent output resistor .The change sensed voltage multiplied error amplifier input difference PMOS current gain (Figure7) must enough achieve specified change output current. Thus,
AMP.
Reference
ERROR
)Vou Then, load regulator obtained from above equation. Vout Since load regulation steady-state parameter, frequency components neglected. load regulation limited open loop current gain system noted from above equation, increasing open loop current gain improved load regulation. vout
Figure
PMOS voltage regulator
Quiescent Current Ground Current
Quiescent current ground current difference between input output currents family. Minimum quiescent current necessary maximum current efficiency. defined:
Quiescent current consists bias current drive current series pass
Vout
element, which contribute output power. series pass element, function diagram, ambient temperature, determine value quiescent current. Linear dropout voltage usually employ bipolar pass element. Figure :The collector current bipolar transistors defined transistors series
Figure
Fixed Regulator
vout
Vout
Figure Adjustable regulator
collector current bipolar transistors common-emitter current gain bipolar transistors base current bipolar transistors base current bipolar transistors proportional collector current. When output current increases, base current
ANALOG INTEGRATIONS CORPORATION
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increases, contributes too. Since base current, current bipolar increases proportionally with output current because series pass element currentdriven device. transistors, quiescent current near constant value with respect load current since device voltagedriven. only things that contribute quiescent current transistors biasing currents band-gap, sampling resistor, error amplifier. most applications where power consumption critical where small bias current needed comparison with output current, voltage regulator using transistors essential. Figure figure show ground current with respect input voltage temperature.
quiescent
transistors have higher quiescent current than transistors. same time, during dropout region quiescent current increases, because additional parasitic current path between emitter base bipolar transistors, which caused lower base voltage than that output voltage. Figure drain source current transistors defined K(Vgs K(Vds transistor conductivity parameter gate source voltage threshold voltage drain current function gate source voltage, gate current.
Ground Current Input Voltage
Ground Current (µA)
Figure transistors
characteristics bipolar
Input Voltage
Vgs4 Vgs3 Vgs2 Vgs1
Figure AIC1722 input ground current characteristics
Figure characteristic transistors bipolar transistors, quiescent current ANALOG INTEGRATIONS CORPORATION
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Power dissipation under these conditions equal PD=(VIN-VOUT)(IOUT)=1.7W Junction temperature will equal TJ=TA+PD(HEAT SINK CASE-TO-HEAT SINK
Ground Current Temperature
Ground Current
=300mA =150mA
operating junction Temperature range: (operating junction Temperature Range)
IL=0.1mA
Temperature (°c)
Figure 1722 temperature ground current characteristics
storage temperature range: +1.7W (Storage Temperature Range) above cases junction temperature lower than maximum rating, ensure reliable operation.
Thermal Considerations
family internal power thermal-limiting circuitry, which designed protect device against overload conditions. continuous normal load conditions however, maximum ratings junction temperature must exceeded. important more attention sources thermal resistance from junction ambient This includes junction-tocase, case-to-heat sink interface, heat sink resistance itself. take following condition example 1086. (max continuous)=5V, VOUT=3.3V, IOUT=1A HEAT TO-220 with thermal compound.
Efficiency
quiescent ground current input/output voltage with respect efficiency regulator input/output voltage follows:
dropout voltage
order have high efficiency regulator, quiescent current must reduced. addition, dropout voltage between input output must minimized since power dissipation regulators efficiency. Power dissipation example AIC1722: Input voltage Output voltage 3.3V Output current
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Ground (max) current 300mA 100% (300mA JA=TR/PD maximum allowable value achieved SOT-223 package TO-220 package TO-263 package, heatsink needed since package will dissipate enough heat satisfy these requirements. calculated value falls below these limits, heatsink required. TABLE Different Heatsink Area Table shows values SOT-223 TO-263 different heatsink area copper patterns that used measure these shown below.
Layout Note
According following parameter, achieve maximum allowable Temperature Rise, (TR) (max)- (max) where (max) maximum allowable junction temperature (max) maximum ambient temperature suitable application. calculated values maximum allowable value junction-to-ambient thermal resistance (JA) calculated: Copper Area Layout Side (in2)* 0.012 0.064 0.52 0.75 0.065 0.174 0.283 0.391 Bottom Side (in2)* 0.065 0.174 0.283 0.391
Thermal Resistance °C/W) °C/W) TO-263 SOT-223
ANALOG INTEGRATIONS CORPORATION
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TABLE Series Temperature table (!)"Since IC's temperature rise wish operate under these conditions. Test TYPEAIC1722-33CZL(TO-92) heat sink Long time test: Power 0.5W 0.7W(!) dissipation Test time: 20min. Load current 298mA 417mA load: Input voltage: 5Vdc Output voltage 3.302V 3.307V Output voltage :3.322Vdc Package Test TYPEAIC1722-33CZL(SOT-89)IC stick Long time test Power 0.5W 0.6W(!) dissipation Test time: 20min. Load current 290mA 348mA load: Input voltage: 5Vdc 3.305V 3.299V Output voltage:3.278Vdc Output voltage Package
Test TYPEAIC1723-33CE(TO-252)IC stick Long time test Power 0.5W 0.9W dissipation Test time: 20min. Load current 300mA 538mA load Input voltage: 5Vdc 3.321V 3.313V Output voltage:3.328Vdc Output voltage Package
1W(!) 598mA 3.316V
Test TYPEAIC1723-33CF(TO-251) heat sink Long time test Power 0.9W dissipation Test time: 20min. Load current 524mA 582mA load: Output voltage 3.294V 3.295V Input voltage: 5Vdc Output voltage:3.284Vdc Package Junction Test TYPEAIC1084CT(TO-220) heat sink Long time test Power 3W(!) dissipation Test time: 20min. Load current 600mA 1.802A load: Output voltage 3.331V 3.311V Input voltage: 5Vdc Output voltage:3.335Vdc Package Junction
1.1W(!) 641mA 3.296V 6W(!) 3.604A 3.291V
ANALOG INTEGRATIONS CORPORATION
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TEL: (8863)577-2500 FAX:(8863)577-2510
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Test TYPEAIC1084CT(TO-220) heat sink Long time test Power dissipation Test time: 20min. Load current 600mA 1.802A load: Input voltage: 5Vdc Output voltage 3.333V 3.322V Output voltage:3.335Vdc Package Junction Test TYPEAIC1084CT(TO-220) stick Long time test Power dissipation Test time: 20min. Load current 600mA 1.802A load: Input voltage: 5Vdc Output voltage 3.333V 3.324V Output voltage:3.335Vdc Package Junction Test TYPEAIC1084CM(TO-263) stick Long time test Power 6W(!) dissipation Test time: 20min. Load current 594mA 1.784A 3.567A load: Output voltage 3.314V 3.296V 3.242V Input voltage 5Vdc Output voltage:3.318Vdc Package Junction Test TYPEAIC1085CT(TO-220) heat sink Long time test Power 3W(!) dissipation Test time: 20min. Load current 556mA 1.667A load: Output voltage 3.193V 3.173V Input voltage: 5Vdc Output voltage:3.200Vdc Package Junction Long time test Test time: 20min. Load current load: Input voltage: 5Vdc Output voltage:3.200Vdc Output voltage Package Junction Test TYPEAIC1085CT(TO-220) heat sink Power dissipation 556mA 3.192V 1.667A 3.179V
6W(!) 3.604A 3.219V 6W(!) 3.604A 3.197V 7W(!) 4.162A 3.077V 6W(!) 3.333A 3.285V 6W(!) 3.333A 3.176V
ANALOG INTEGRATIONS CORPORATION
Industry Road, Science-based Industrial Park Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
Series Product
Test TYPEAIC1085CT(TO-220) stick Long time test Power dissipation Test time: 20min. Load current 556mA 1.667A load: Output voltage 3.199V 3.192V Input voltage: 5Vdc Output voltage:3.200Vdc Package Junction Test TYPEAIC1085CM(TO-263) stick Long time test Power dissipation Test time: 20min. Load current 595mA 1.788A load: Output voltage 3.321V 3.310V Input voltage: 5Vdc Output voltage:3.322Vdc Package junction Test TYPEAIC1117CE(TO-252) stick Long time test Power 1.5W dissipation Test time: 20min. Load current 561mA 841mA load: Output voltage 3.204V 3.192V Input voltage 5Vdc Output voltage:3.217Vdc Package junction
6W(!) 3.333A 3.174V 6W(!) 3.576A 3.192V 2W(!) 1.122A 3.184V
Summary
10µF greater) capacitor required between family output ground stability. Without this capacitor part will oscillate. Even though most types capacitor work, equivalent series resistance (ESR) should held less Aluminum electrolytic type used. Many Aluminum electrolytic have electrolytes that freeze about -30°C, solid tantalums recommended operation below -25°C. value this capacitor increased without limit. 10µF greater) capacitor should placed from family input ground lead inductance between input power source exceeds 500nH (approximately inches trace).
ANALOG INTEGRATIONS CORPORATION
Industry Road, Science-based Industrial Park Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510

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