Fixed, Adjustable Low-Dropout Linear Voltage Regulator ADP3367* A
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FEATURES Dropout: Dropout: Power CMOS: Quiescent Current Shutdown Mode: Quiescent Current Output Current Guaranteed Compatible with MAX667 Stable with Load Capacitor +2.5 +16.5 Operating Range Battery Detector Fixed Adjustable Output High Accuracy: Dropout Detector Output Thermal Resistance Package* 6000 APPLICATIONS Handheld Instruments Cellular Telephones Battery Operated Devices Portable Equipment Solar Powered Instruments High Efficiency Linear Power Supplies GENERAL DESCRIPTION
Fixed, Adjustable Low-Dropout Linear Voltage Regulator ADP3367*
ADP3367
SHDN
1.255V 50mV
TYPICAL OPERATING CIRCUIT
INPUT OUTPUT 10µF
ADP3367
SHDN
ADP3367 low-dropout precision voltage regulator that supply output current. used give fixed output with additional external components adjusted from +1.3 using external resistors. Fixed adjustable operation selected input. quiescent current conjunction with standby shutdown mode (0.2 makes this device especially suitable battery powered systems. dropout voltage when supplying only allowing operation with minimal headroom thereby prolonging useful battery life. higher output current levels dropout remains increasing just when supplying wide input voltage range from 16.5 allowable. Additional features include dropout detector supply/battery monitoring comparator. dropout detector used signal loss regulation while battery detector used monitor input supply voltage. ADP3367 much improved pin-compatible replacement MAX667. Improvements include lower supply current, tighter voltage accuracy superior line load regulation. Improved protection (>6000 achieved advanced voltage clamping structures. ADP3367 specified over industrial temperature range -40°C +85°C available narrow surface mount (SOIC) packages.
*Patent pending.
+50°C
GUARANTEED 300mA
LOAD CURRENT
ADP3367 DISSIPATION LIMIT
STANDARD PACKAGE DISSIPATION LIMIT VIN-VOUT
Load Current Input-Output Differential Voltage
ADI's proprietary Thermal Coastline leadframe used ADP3367AR packaging, lower thermal resistance than standard leadframes. This improvement heat flow rate results lower temperature hence improves reliability.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Analog Devices, Inc., 1995 Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
ADP3367-SPECIFICATIONS
Parameter Input Voltage, Output Voltage, Maximum Output Current Quiescent Current IGND: Shutdown Mode IGND: Normal Mode
VOUT TMIN TMAX unless otherwise noted)
16.5 Units VSET IOUT +5.5 VSHDN VSHDN VSET IOUT IOUT IOUT IOUT IOUT IOUT IOUT +25°C IOUT IOUT IOUT IOUT IOUT +25°C IOUT mA-100 IOUT mA-200 IOUT Test Conditions/Comments
0.75 1.28
Dropout Voltage VOUT
VOUT
1.23 1.255 0.01 1.215 1.255 0.01
Load Regulation Line Regulation Reference Voltage, VSET Input Threshold Input Current, ISET Output Leakage Current, Short Circuit Current, Battery Detector Input Threshold, Hysteresis Input Leakage Current, Battery Detector Output Voltage, Shutdown Input Voltage, VSHDN Shutdown Input Current, ISHDN Dropout Detector Output Voltage
Specifications subject change without notice.
VSET VSHDN +25°C TMIN TMAX
1.295 0.25 0.40 0.25
VLBI VLBI ILBO +25°C VLBI ILBO TMIN TMAX VSHDN (VSET VSHDN IOUT (VSET VSHDN IOUT
0.01
ABSOLUTE MAXIMUM RATINGS*
(TA= +25°C unless otherwise noted) Input Voltage, Output Short Circuit Duration Output Sink Current Output Voltage VOUT SHDN Input Voltage -0.3 (VIN LBI, Input Voltage -0.3 (VIN Power Dissipation, (Derate mW/°C above +50°C) Thermal Impedance 98°C/W Operating Temperature Range Industrial Version) -40°C +85°C Storage Temperature Range -65°C +150°C
Lead Temperature (Soldering, sec) +300°C Vapor Phase sec) +215°C Infrared sec) +220°C Rating 6000
*This stress rating only functional operation device these other conditions above those indicated operation sections this specification implied. Exposure absolute maximum rating conditions extended periods time affect reliability.
ORDERING GUIDE
Model ADP3367AR
Temperature Range -40°C +85°C
Package Option* SO-8
Small Outline Package.
REV.
ADP3367
FUNCTION DESCRIPTION GENERAL INFORMATION
Mnemonic Function SHDN Dropout Detector Output. collector output which sources current dropout reached. Voltage Regulator Input. Ground Pin. Must connected Battery Detect Input. Compared with 1.255 Battery Detect Output. Open Drain Output that goes when below threshold. Digital Input. used disable device that power consumption minimized. Voltage Setting Input. Connect output connect resistive divider adjustable output. Regulated Output Voltage. Connect filter capacitor.
SOIC CONFIGURATION
ADP3367 contains micropower bandgap reference voltage source, error amplifier comparators (C1, series output pass transistor.
CIRCUIT DESCRIPTION
internal bandgap voltage reference trimmed 1.255 used reference input error amplifier feedback signal from regulator output supplied other input on-chip voltage divider external resistors. When input ground, internal divider provides error amplifier's feedback signal giving output. When more than above ground, comparator switches error amplifier's input directly pin, external resistors used output voltage. external resistors selected that desired output voltage gives 1.255 input. output from error amplifier supplies base current output pass transistor which provides output current. output current available provided that device power dissipation exceeded. Comparator compares voltage Battery Input (LBI) internal +1.255 reference voltage. output from comparator drives open drain connected Battery Output pin, LBO. Battery Threshold using suitable voltage divider connected LBI. When voltage falls below 1.255 open drain output, LBO, pulled low. shutdown (SHDN) input that used disable error amplifier hence voltage output also available. supply current shutdown less than 0.75
SHDN
ADP3367
VIEW (Not Scale)
TERMINOLOGY
Dropout Voltage: input/output voltage differential which regulator longer maintains regulation against further reductions input voltage. measured when output decreases from nominal value. nominal value measured value with VOUT Line Regulation: change output voltage result change input voltage. specified change input voltage from Load Regulation: change output voltage change output current. specified output current change from Quiescent Current (IGND): input bias current which flows into regulator including load current. measured line specified shutdown also different values load current. Shutdown: regulator disabled power consumption minimized. Dropout Detector: output that indicates that regulator dropping regulation. Maximum Power Dissipation: maximum total device dissipation which regulator will continue operate within specifications.
ADP3367
SHDN
1.255V 50mV
Figure ADP3367 Functional Block Diagram
REV.
ADP3367-Typical Performance Characteristics
+25°C
+25°C 10µF
DROPOUT VOLTAGE
LOAD CURRENT
Figure Dropout Voltage Load Current
Figure Load Regulation (DVOUT DIOUT)
+25°C
+25°C +10V
GROUND CURRENT
200mV VOUT
0.01 0.01
IOUT
1000
2.00V
200mV
2.00ms
Figure Ground Current Load Current
Figure Dynamic Response Input Change
1000 +25°C
100mA
OUTPUT CURRENT
OUTPUT CURRENT
100mA 10mA
50mA 20mA 10mA
20mV VOUT
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
1.00V
20.0mV
2.00ms
DIFFERENCE
Figure Output Current Differential
Figure Dynamic Response Load Change
REV.
ADP3367
APPLICATIONS INFORMATION Circuit Configurations Supply Battery Detection
fixed output input should grounded, external resistors necessary. This basic configuration shown Figure input voltage range from +5.15 +16.5 output currents available provided that maximum package power dissipation exceeded.
OUTPUT 10µF
ADP3367 contains on-chip circuitry power supply battery detection. voltage falls below internal 1.255 reference, then open drain output will low. threshold voltage voltage above 1.255 appropriate resistor divider selection.
VBATT VLBI
ADP3367
SHDN
where resistive divider resistors VBATT desired voltage threshold. Since input leakage current less than large values selected order minimize loading. example, threshold, using output open-drain output that goes sinking current when less than 1.255 pull-up resistor greater used obtain logic output level with pull-up resistor connected VOUT.
VOUT 10µF
Figure Fixed Output Circuit
Output Voltage Setting
input connected resistor divider network, output voltage according following equation: where VSET 1.255
ADP3367
SHDN
BATTERY STATUS OUTPUT
VOUT 10µF
ADP3367
Figure Battery/Supply Detect Circuit
SHDN
Dropout Detector
Figure Adjustable Output Circuit
resistor values selected first choosing value then selecting according following equation:
input leakage current maximum. This allows large resistor values chosen with little degradation accuracy. example, resistor selected then calculated accordingly. tolerance guaranteed less than most applications fixed resistors will suitable.
Shutdown Input (SHDN)
ADP3367 features extremely dropout voltage making suitable voltage systems where headroom limited. dropout detector also provided. dropout detector output, changes dropout voltage approaches limit. This useful warning that regulation longer maintained. dropout detector output open collector output from transistor. Under normal operating conditions with input voltage more than above output, transistor current flows pin. voltage differential reduces less than transistor switches current sourced. This condition indicates that regulation longer maintained. Please refer Figure "Typical Performance Characteristics." current output translated into voltage output connecting resistor from GND. resistor value suitable. digital status signal obtained using comparator. on-chip comparator used being used monitor battery voltage. This illustrated Figure
SHDN input allows regulator switched with logic level signal. This will disable output reduce current drain quiescent (0.75 maximum) current. This very useful power applications. Driving SHDN input greater than places part shutdown. shutdown function being used, then SHDN should connected GND.
REV.
ADP3367
ADP3367
SHDN
10µF
OUTPUT
DROPOUT STATUS OUTPUT
100k
reached, output starts sourcing current into input through This increases voltage that regulator feedback loop does drive internal transistor hard otherwise would. input voltage continues decrease, more current sourced, thereby reducing drive even further. advantage this scheme that maintains quiescent current down very values which point batteries well outside their useful operating range. output voltage tracks input voltage minus dropout. SHDN function also unaffected used normally desired.
OUTPUT
Figure Dropout Status Output
Output Capacitor
ADP3367
SHDN
10µF
output capacitor required ADP3367 maintain stability also improve load transient response. Capacitor values from upwards recommended. Capacitors larger than will further improve transient response. Tantalum aluminum electrolytics suitable most applications. temperatures below about -25°C, solid tantalums should used many aluminum electrolytes freeze this temperature.
Quiescent Current Considerations
610k
ADP3367 uses output stage achieve dropout voltages combined with high output current capability. Under normal regulating conditions quiescent current extremely low. However input voltage drops that below desired output voltage, quiescent current increases considerably. This happens because regulation longer maintained large base current flows output transistor attempt hold fully minimum quiescent current, therefore important that input voltage maintained higher than desired output level. device being powered using battery that discharge down below recommended level, there couple techniques that applied reduce quiescent current, expense dropout voltage. first these illustrated Figure connecting SHDN regulator partially disabled with input voltages below desired output voltage therefore quiescent current reduced considerably.
OUTPUT
1.2mA 900µA
GROUND CURRENT
500µA QUIESCENT CURRENT BELOW DROPOUT
Figure Reduction
POWER DISSIPATION
ADP3367
SHDN
10µF
0.1µF
ADP3367 supply currents operate with input voltages high 16.5 simultaneously. important that power dissipation hence internal temperature maintained below maximum limits. Power Dissipation product voltage differential across regulator times current being supplied load. maximum package power dissipation given Absolute Maximum Ratings. order avoid excessive temperatures, these ratings must strictly observed. (VIN VOUT temperature dependent both ambient temperature power being dissipated device. internal temperature must exceed 125°C. Therefore, care must taken ensure that, under normal operating conditions, temperature kept below thermal limit. (JA)
Figure Reduction
Another technique reducing quiescent current near dropout illustrated Figure output used modify output voltage that drops, desired output voltage setpoint also drops. This technique only works when external resistors used output voltage. With greater than VOUT, effect. reduces dropout
REV.
ADP3367
This expressed terms power dissipation follows: TA)/(JA) where: Junction Temperature (°C) Ambient Temperature (°C) Power Dissipation perature differential between board; remember, rate which heat transferred directly proportional temperature differential. Various board layout techniques could used remove heat from immediate vicinity package. Consider following issues when designing board layout: board traces with larger copper cross section areas will remove more heat; with thicker copper and/or wider traces. Increase surface area exposed open heat removed convection forced flow. larger masses such heat sinks thermally conductive enclosures distribute dissipate heat. solder mask silk screen heat dissipating traces; black anodizing will significantly improve heat dissipation means increased radiation.
High Power Dissipation Recommendations
Junction Ambient Thermal Resistance (°C/W)
device being operated maximum permitted ambient temperature 85°C, maximum power dissipation permitted (max) (max) TA)/(JA) (max) (125 85)/(JA) 40/JA where:
98°C/W 8-pin SOIC (R-8) package
Therefore, maximum ambient temperature 85°C (max) lower ambient temperatures maximum permitted power dissipation increases accordingly maximum limits specified absolute maximum specifications. thermal impedance (JA) figures given measured still conditions reduced considerably where assisted cooling employed. Other techniques reducing thermal impedance include large contact pads printed circuit board wide traces. copper will heat exchanger thereby reducing effective thermal impedance.
POWER DISSIPATION Thermal Resistance Package
Where excessive power dissipation high input-output differential voltages and/or high current conditions exists, simplest method reducing power requirements regulator series dropper resistor. this excess power dissipated external resistor. example, consider input voltage output voltage requirement with ambient temperature +85°C. package power dissipation under these conditions which exceeds maximum ratings. using dropper resistor drop power dissipation requirement regulator reduced which within maximum specifications SO-8 package 85°C. resistor value calculated 4/0.1 resistor power rating greater used.
0.5W 10µF OUTPUT
ADP3367 utilizes patented proprietary Thermal Coastline Leadframe which offers significantly lower resistance heat flow from board. Heat generated removed transferred board faster resulting lower temperature than standard packages. Table performance comparison between standard Thermal Coastline package.
Table Thermal Resistance Performance Comparison* Standard Package (SO-8) 44°C/W 170°C/W Thermal Coastline Package 40°C/W 98°C/W
ADP3367
SHDN
Figure Reducing Regulator Power Dissipation
Transient Response
ADP3367 exhibits excellent transient performance illustrated "Typical Performance Characteristics." Figure shows that input step from results very small output disturbance mV). Adding input capacitor would improve this even more. Figure shows quickly regulator recovers from output load change from offset load current change less than
Monitored Power Supply
*Data presented Table obtained using SEMI Standard Method G38-47 SEMI Standard Specification G42-88.
device operating room temperature, +25°C, +125°C junction temperature dissipate 1.15 maintain this high level heat removal efficiency, once heat removed from board, should dissipated other mediums maintain largest possible tem-
Figure shows ADP3367 being used monitored supply application. ADP3367 supplies micro-
REV.
ADP3367
processor. Monitoring supply, ADM705 will generate reset supply voltage falls below 4.65 Early warning impending power fail generated power fail comparator ADM705. resistive divider network samples preregulator input voltage that failing power detected while regulator still operating normally. interrupt generated that power-down sequence completed before power completely lost. dropout voltage ADP3367 maximizes available time carry powerdown sequence. resistor divider network should selected that voltage 1.25 desired warning voltage.
UNREGULATED
ADP3367
10µF SHDN
RESET ADM705
RESET
INTERRUPT
Figure Regulator with Supply Monitoring Early Power-Fail Warning
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
8-Lead Narrow-Body SOIC (SO-8)
0.1574 (4.00) 0.1497 (3.80)
0.2440 (6.20) 0.2284 (5.80)
0.1968 (5.00) 0.1890 (4.80) 0.0098 (0.25) 0.0040 (0.10) 0.0500 (1.27) 0.0688 (1.75) 0.0532 (1.35) 0.0192 (0.49) 0.0138 (0.35)
0.0196 (0.50) 0.0099 (0.25)
0.0098 (0.25) 0.0075 (0.19)
0.0500 (1.27) 0.0160 (0.41)
REV.
PRINTED U.S.A.
C2083-10-10/95
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