Micropower DC-DC Converter ADP1173 FUNCTIONAL BLOCK DIAGRAMS
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FEATURES Operates From Input Voltages Only Supply Current (Typical) Step-Up Step-Down Mode Operation Very External Components Required Battery Detector On-Chip User-Adjustable Current Limit Internal Power Switch Fixed Adjustable Output Voltage Versions 8-Pin SO-8 Package APPLICATIONS Notebook Palmtop Computers Cellular Telephones Flash Memory Generators Converters Converters Portable Instruments Bias Generators
Micropower DC-DC Converter ADP1173
FUNCTIONAL BLOCK DIAGRAMS
ADP1173
GAIN BLOCK/ ERROR 1.245V REFERENCE ILIM OSCILLATOR DRIVER
COMPARATOR
ADP1173-3.3 ADP1173-5 ADP1173-12
GAIN BLOCK/ ERROR 1.245V REFERENCE ILIM OSCILLATOR DRIVER ADP1173-3.3: 456k ADP1173-5: 250k ADP1173-12: 87.4k SENSE
GENERAL DESCRIPTION
ADP1173 part family step-up/step-down switching regulators that operates from input supply voltage little step-up mode step-down mode. ADP1173 consumes little standby mode, making ideal applications that need quiescent current. auxiliary gain amplifier serve battery detector, linear regulator (under voltage lockout) error amplifier. ADP1173 deliver from input step-up configuration from input step-down configuration. input voltages less than ADP1073.
COMPARATOR 753k
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. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Site: http://www.analog.com Fax: 617/326-8703 Analog Devices, Inc., 1997
ADP1173-SPECIFICATIONS
unless otherwise noted)
1.20 3.14 4.75 11.4 1.245 3.30 5.00 12.0 0.15 0.02 12.6 1.30 3.46 5.25 12.6 0.075 0.85 Units
Model QUIESCENT CURRENT
Symbol
Conditions Switch Load, +25°C ADP1173-3.3 ADP1173-5 ADP1173-12 Step-Up Mode Step-Down Mode ADP11731
QUIESCENT CURRENT, BOOST MODE CONFIGURATION
INPUT VOLTAGE COMPARATOR TRIP POINT VOLTAGE OUTPUT SENSE VOLTAGE
VOUT
ADP1173-3.32 ADP1173-52 ADP1173-122 ADP1173 ADP1173-3.3 ADP1173-5 ADP1173-12
COMPARATOR HYSTERESIS OUTPUT HYSTERESIS
OSCILLATOR FREQUENCY DUTY CYCLE SWITCH TIME FEEDBACK BIAS CURRENT BIAS CURRENT GAIN BLOCK OUTPUT REFERENCE LINE REGULATION SWSAT VOLTAGE, STEP-UP MODE
fOSC Full Load ILIM Tied ADP1173, VSET VREF ISINK VSET 1.00 VSAT +25°C +25°C, from ILIM +25°C
SWSAT VOLTAGE, STEP-DOWN MODE
VSAT
1000
GAIN BLOCK GAIN CURRENT LIMIT CURRENT LIMIT TEMPERATURE COEFFICIENT SWITCH-OFF LEAKAGE CURRENT MAXIMUM EXCURSION BELOW
-0.3 Measured +25°C VSW2 ISW1 Switch +25°C -400 -350
%/°C
NOTES This specification guarantees that both high trip points comparator fall within 1.20 1.30 range. output voltage waveform will exhibit sawtooth shape comparator hysteresis. output voltage fixed output versions will always within specified range. resistor connected between source pin. Specifications subject change without notice.
REV.
ADP1173
ABSOLUTE MAXIMUM RATINGS* CONFIGURATIONS 8-Lead Plastic
ILIM (SENSE)*
Supply Voltage (VIN) Voltage (VSW1) Voltage (VSW2) -0.5 Feedback Voltage (ADP1173) Sense Voltage (ADP1173, -3.3, -12) Maximum Power Dissipation Maximum Switch Current .1.5 Operating Temperature Range +70°C Storage Temperature Range -65°C 150°C Lead Temperature, (Soldering, sec) +300°C
*Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those listed operational sections this specification implied. Exposure absolute maximum ratings extended periods time affect device reliability.
SO-8 8-Lead Plastic
ILIM (SENSE)*
ADP1173
ADP1173
VIEW (Not Scale)
VIEW (Not Scale)
*FIXED VERSIONS
*FIXED VERSIONS
FUNCTION DESCRIPTIONS
Mnemonic ILIM
Function normal conditions this connected VIN. When lower current required, resistor should connected between ILIM VIN. Limiting switch current achieved connecting resistor. Input Voltage. Collector Node Power Transistor. step-down configuration, connect VIN; step-up configuration, connect inductor/diode. Emitter Node Power Transistor. stepdown configuration, connect inductor/ diode; step-up configuration, connect ground. allow this drop more than diode drop below ground. Ground. Auxiliary Gain (GB) Output. open collector sink Gain Amplifier Input. amplifier positive input connected negative input connected 1.245 reference. ADP1173 (adjustable) version this connected comparator input. ADP1173-3.3, ADP1173-5 ADP1173-12, goes directly internal application resistor that sets output voltage.
ORDERING GUIDE
Model ADP1173AN ADP1173AR ADP1173AN-3.3 ADP1173AR-3.3 ADP1173AN-5 ADP1173AR-5 ADP1173AN-12 ADP1173AR-12
Output Voltage
Package Options* SO-8 SO-8 SO-8 SO-8
Plastic DIP, Small Outline Package.
100µH 470µF
IRF7203 OUTPUT 100mA
470k
ILIM NICAD ALKALINE CELLS
ADP1173
470µF
470µF
FB/SENSE
COILTRONICS CTX100-4
Figure Step-Up Step-Down Converter
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although ADP1173 features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
REV.
ADP1173 -Typical Performance Characteristics
SWITCH VOLTAGE
1100 1000
SWITCH CURRENT
VCE(SAT)
(SAT)
SWITCH CURRENT
0.05
0.15 0.25 0.35 0.45 0.55 0.65 SWITCH CURRENT
0.75
RLIM
1000
Figure Saturation Voltage Switch Current Step-Up Mode
Figure Switch Voltage Switch Current Step-Down Mode
Figure Maximum Switch Current RLIM Step-Up Mode
1000 =24V WITH 500µH VOUT
SUPPLY CURRENT
SWITCH CURRENT
RLIM 1000 =12V WITH 250µH VOUT
SWITCH CURRENT
QUIESCENT CURRENT
QUIESCENT CURRENT
TEMPERATURE
Figure Maximum Switch Current RLIM Step-Down Mode
Figure Supply Current Switch Current
Figure Quiescent Current Temperature
25.5
FEEDBACK BIAS CURRENT
OSCILLATOR FREQUENCY
24.5 23.5 OSCILLATOR FREQUENCY 22.5 21.5
BIAS CURRENT
INPUT VOLTAGE Volts
TEMPERATURE
TEMPERATURE
Figure Oscillator Frequency Input Voltage
Figure Bias Current Temperature
Figure Feedback Bias Current Temperature
REV.
ADP1173
APPLICATIONS Theory Operation COMPONENT SELECTION General Notes Inductor Selection
ADP1173 flexible, power switch mode power supply (SMPS) controller. regulated output voltage greater than input voltage (boost step-up mode) less than input (buck step-down mode). This device uses gated-oscillator technique provide very high performance with quiescent current. functional block diagram ADP1173 shown front page. internal 1.245 reference connected input comparator, while other input externally connected (via pin) feedback network connected regulated output. When voltage falls below 1.245 oscillator turns driver amplifier provides base drive internal power switch, switching action raises output voltage. When voltage exceeds 1.245 oscillator shut off. While oscillator off, ADP1173 quiescent current only comparator includes small amount hysteresis, which ensures loop stability without requiring external components frequency compensation. maximum current internal power switch connecting resistor between ILIM pin. When maximum current exceeded, switch turned OFF. current limit circuitry time delay about external resistor used, connect ILIM VIN. Further information ILIM included Limiting Switch Current section this data sheet. ADP1173 internal oscillator provides times, which ideal applications where ratio between VOUT roughly factor (such converting However, wider range conversions (such generating from supply) easily accomplished. uncommitted gain block ADP1173 connected battery detector. inverting input gain block internally connected 1.245 reference. noninverting input available pin. resistor divider, connected between with junction connected pin, causes output when battery point exceeded. output open collector transistor which sink ADP1173 provides external connections both collector emitter internal power switch, which permits both step-up step-down modes operation. stepup mode, emitter (pin SW2) connected collector (pin SW1) drives inductor. step-down mode, emitter drives inductor while collector connected VIN. output voltage ADP1173 with external resistors. Three fixed-voltage models also available: ADP1173-3.3 (+3.3 ADP1173-5 ADP1173-12 (+12 fixed-voltage models identical ADP1173, except that laser-trimmed voltage-setting resistors included chip. fixed-voltage models ADP1173, simply connect feedback (Pin directly output voltage.
When ADP1173 internal power switch turns current begins flow inductor. Energy stored inductor core while switch this stored energy then transferred load when switch turns off. Both collector emitter switch transistor accessible ADP1173, output voltage higher, lower opposite polarity than input voltage. specify inductor ADP1173, proper values inductance, saturation current resistance must determined. This process difficult, specific equations each circuit configuration provided this data sheet. general terms, however, inductance value must enough store required amount energy (when both input voltage switch time minimum) high enough that inductor will saturate when both switch time their maximum values. inductor must also store enough energy supply load without saturating. Finally, resistance inductor should low, that excessive power will wasted heating windings. most ADP1173 applications, inductor with saturation current rating resistance suitable. Ferrite core inductors which meet these specifications available small, surfacemount packages. minimize Electro-Magnetic Interference (EMI), toroid core type inductor recommended. core inductors lower cost alternative problem.
CALCULATING INDUCTOR VALUE
Selecting proper inductor value simple three-step process: Define operating parameters: minimum input voltage, maximum input voltage, output voltage output current. Select appropriate conversion topology (step-up, stepdown, inverting). Calculate inductor value, using equations following sections.
Inductor Selection-Step-Up Converter
step-up, boost, converter (Figure 14), inductor must store enough power make difference between input voltage output voltage. power that must stored calculated from equation:
IN(MIN IOUT
where diode forward voltage 1N5818 Schottky). Energy only stored inductor while ADP1173 switch energy stored inductor each switching cycle must must equal greater than:
order ADP1173 regulate output voltage.
REV.
ADP1173
When internal power switch turns current flow inductor increases rate
where henrys switch equivalent resistance (typically +25°C) resistance inductor. most applications, where voltage drop across switch small compared simpler equation used:
When selecting inductor, peak current must exceed maximum switch current equations shown above result peak currents ADP1073 should considered. This device duty cycle, more energy stored inductor each cycle. This results greater output power. peak current must evaluated both minimum maximum values input voltage. switch current high when minimum, then limit exceeded maximum value VIN. this case, ADP1173's current limit feature used limit switch current. Simply select resistor (using Figure that will limit maximum switch current IPEAK value calculated minimum value VIN. This will improve efficiency producing constant IPEAK increases. Limiting Switch Current section this data sheet more information. Note that switch current limit feature does protect circuit output shorted ground. this case, current only limited resistance inductor forward voltage diode.
Inductor Selection-Step-Down Converter
Replacing above equation with time ADP1173 typical) will define peak current given inductor value input voltage. this point, inductor energy calculated follows:
PEAK
previously mentioned, must greater than PL/fOSC ADP1173 deliver necessary power load. best efficiency, peak current should limited less. Higher switch currents will reduce efficiency, because increased saturation voltage switch. High peak current also increases output ripple. general rule, keep peak current possible minimize losses switch, inductor diode. practice, inductor value easily selected using equations above. example, consider supply that will generate from source. inductor power required from Equation
0.5V
step-down mode operation shown Figure Unlike step-up mode, ADP1173's power switch does saturate when operating step-down mode. Therefore, switch current should limited this mode. input voltage will vary over wide range, ILIM used limit maximum switch current. higher output current required, ADP1111 should considered. first step selecting step-down inductor calculate peak switch current follows:
PEAK 2IOUT
each switching cycle, inductor must supply:
=13.5
where duty cycle (0.55 ADP1173) voltage drop across switch diode drop (0.5 1N5818) IOUT output current VOUT output voltage minimum input voltage previously mentioned, switch voltage higher stepdown mode than step-up mode. function switch current therefore function VIN, time VOUT. most applications, value recommended. inductor value calculated:
IN(MIN PEAK
required inductor power fairly this example, peak current also low. Assuming peak current starting point, Equation rearranged recommend inductor value:
=138 L(MAX
Substituting standard inductor value with resistance, will produce peak switch current
PEAK
-1.0
Once peak current known, inductor energy calculated from Equation
(100 (616 mA)2
where switch time input voltage will vary (such application that must operate from source) RLIM resistor should selected from Figure RLIM resistor will keep switch current constant input voltage rises. Note that there separate RLIM values step-up step-down modes operation.
inductor energy greater than PL/fOSC requirement 13.5 inductor will work this application. substituting other inductor values into same equations, optimum inductor value selected.
REV.
ADP1173
example, assume that required from input. Deriving peak current from Equation yields:
PEAK 0.55
Using standard inductor value with resistance, will produce peak switch current
PEAK
-0.85 4.5V 0.75V 0.65
peak current then inserted into Equation calculate inductor value:
-1.5
Once peak current known, inductor energy calculated from Equation
(220 (375 mA)2 =15.5
Since standard value, next lower standard value would specified. avoid exceeding maximum switch current when input voltage RLIM resistor should specified. Using step-down curve Figure value will limit switch current
Inductor Selection-Positive-to-Negative Converter
inductor energy 15.5 greater than PL/fOSC requirement 11.5 inductor will work this application. input voltage only varies between this example. Therefore, peak current will change enough require RLIM resistor ILIM connected directly VIN. Care should taken ensure that peak current does exceed
CAPACITOR SELECTION
configuration positive-to-negative converter using ADP1173 shown Figure with step-up converter, output power inverting circuit must supplied inductor. required inductor power derived from formula:
OUT|+V IOUT
optimum performance, ADP1173's output capacitor must carefully selected. Choosing inappropriate capacitor result efficiency and/or high output ripple. Ordinary aluminum electrolytic capacitors inexpensive, often have poor Equivalent Series Resistance (ESR) Equivalent Series Inductance (ESL). aluminum capacitors, specifically designed switch mode converter applications, also available, these better choice than general purpose devices. Even better performance achieved with tantalum capacitors, although their cost higher. Very values achieved using OS-CON* capacitors (Sanyo Corporation, Diego, CA). These devices fairly small, available with tape-and-reel packaging, have very ESR. effects capacitor selection output ripple demonstrated Figures These figures show output same ADP1173 converter, which evaluated with three different output capacitors. each case, peak switch current capacitor value Figure shows Panasonic HF-series* radial aluminum electrolytic. When switch turns off, output voltage jumps about then decays inductor discharges into capacitor. rise voltage indicates about 0.18 Figure aluminum electrolytic been replaced Sprague 593D-series* tantalum device. this case output jumps about which indicates 0.07 Figure shows OS-CON series capacitor same circuit, only 0.02
*All trademarks properties their respective holders.
ADP1173 power switch does saturate positive-tonegative mode. voltage drop across switch modeled 0.75 base-emitter diode series with 0.65 resistor. When switch turns inductor current will rise rate determined
_R't
where 0.65 RL(DC) where 0.75 example, assume that output generated from +4.5 +5.5 source. power inductor calculated from Equation
(|-5V|+ 0.5V
During each switching cycle, inductor must supply following energy:
=11.5
REV.
ADP1173
DIODE SELECTION
specifying diode, consideration must given speed, forward voltage drop reverse leakage current. When ADP1173 switch turns off, diode must turn rapidly high efficiency maintained. Schottky rectifiers, well fast signal diodes such 1N4148, appropriate. forward voltage diode represents power that delivered load, must also minimized. Again, Schottky diodes recommended. Leakage current especially important current applications, where leakage significant percentage total quiescent current. most circuits, 1N5818 suitable companion ADP1173. This diode leakage, fast turn-on turn-off times. surface mount version, MBRS130T3, also available. applications where ADP1173 "off" most time, such when load intermittent, silicon diode provide higher overall efficiency lower leakage. example, 1N4933 capability, with leakage current less than higher forward voltage 1N4933 reduces efficiency when ADP1173 delivers power, lower leakage outweigh reduction efficiency. switch currents less, Schottky diode such BAT85 provides leakage less than similar device, BAT54, available SOT23 package. Even lower leakage, range, obtained with 1N4148 signal diode.
Figure Tantalum Electrolytic
Figure Aluminum Electrolytic
General purpose rectifiers, such 1N4001, suitable ADP1173 circuits. These devices, which have turn-on times more, slow switching power supply applications. Using such diode "just started" will result wasted time effort. Even ADP1173 circuit appears function with 1N4001, resulting performance will indicative circuit performance when correct diode used.
CIRCUIT OPERATION, STEP-UP (BOOST) MODE
boost mode, ADP1173 produces output voltage that higher than input voltage. example, generated from logic power supply derived from alkaline cells Figure shows ADP1173 configured step-up operation. collector internal power switch connected output side inductor, while emitter connected GND. When switch turns pulled near ground. This action forces voltage across equal VIN-VCE(SAT), current begins flow through This current reaches final value (ignoring second-order effects)
PEAK CE(SAT
Figure OS-CON Capacitor
output ripple important, user should consider ADP3000. This device switches kHz, higher switching frequency simplifies design output filter. Consult ADP3000 data sheet additional details. potential current paths must considered when analyzing very power applications, this includes capacitor leakage current. OS-CON capacitors have leakage range, which will reduce efficiency when load also microampere range. Tantalum capacitors, with typical leakage range, recommended very power applications.
where ADP1173 switch's "on" time.
REV.
ADP1173
VOUT
ILIM
ADP1173
When switch turns off, magnetic field collapses. polarity across inductor changes switch side inductor driven below ground. Schottky diode then turns current flows into load. Notice that Absolute Maximum Rating ADP1173's below ground. avoid exceeding this limit, must Schottky diode. Using silicon diode this application will generate forward voltages above which will cause potentially damaging power dissipation within ADP1173. output voltage buck regulator back ADP1173's resistors When voltage falls below 1.245 internal power switch turns "on" again cycle repeats. output voltage formula:
=1.245
OPTIONAL
Figure Step-Up Mode Operation
When switch turns off, magnetic field collapses. polarity across inductor changes, current begins flow through into load output voltage driven above input voltage. output voltage back ADP1173 resistors When voltage falls below 1.245 turns "on" again cycle repeats. output voltage therefore formula:
=1.245
When operating ADP1173 step-down mode, output voltage impressed across internal power switch's emitterbase junction when switch off. protect switch, output voltage should limited less. higher output voltage required, Schottky diode should placed series with SW2, shown Figure high output current required step-down converter, ADP1111 ADP3000 should considered. These devices offer higher frequency operation, which reduces inductor size, external pass transistor added reduce switch.
RLIM
circuit Figure shows direct current path from VOUT, inductor Therefore, boost converter protected output short circuited ground.
CIRCUIT OPERATION, STEP-DOWN (BUCK) MODE
ADP1173's step-down mode used produce output voltage lower than input voltage. example, output four NiCd cells (+4.8 converted +3.3 logic supply. typical configuration step-down operation ADP1173 shown Figure this case, collector internal power switch connected emitter drives inductor. When switch turns pulled toward VIN. This forces voltage across equal (VIN-VCE) VOUT, causes current flow This current reaches final value
PEAK
ILIM
1N5818 VOUT 1N5818
ADP1173
Figure Step-Down Mode, VOUT
where ADP1173 switch's "on" time.
input voltage ADP1173 varies over wide range, current limiting resistor required. particular circuit requires high peak inductor current with minimum input supply voltage, peak current exceed switch maximum rating and/or saturate inductor when supply voltage maximum value. Limiting Switch Current section this data sheet specific recommendations.
POSITIVE-TO-NEGATIVE CONVERSION
VOUT
ILIM
ADP1173
1N5818
ADP1173 convert positive input voltage negative output voltage, shown Figure This circuit essentially identical step-down application Figure except that "output" side inductor connected power ground. When ADP1173's internal power switch turns off, current flowing inductor forces output (-VOUT) negative potential. ADP1173 will continue turn switch
Figure Step-Down Mode Operation
REV.
ADP1173
until 1.245 above pin, output voltage determined formula:
+VIN
LIMITING SWITCH CURRENT
=1.245
ILIM
1N5818
ADP1173
ADP1173's RLIM permits switch current limited with single resistor. This current limiting action occurs pulse pulse basis. This feature allows input voltage vary over wide range, without saturating inductor exceeding maximum switch rating. example, particular design require peak switch current with input. rises however, switch current will exceed ADP1173 limits switch current thereby protects switch, increases output ripple. Selecting proper resistor will limit switch current even increases. relationship between RLIM maximum switch current shown Figures ILIM feature also valuable controlling inductor current when ADP1173 goes into continuous-conduction mode. This occurs step-up mode when following condition met:
DIODE
-VOUT
Figure Positive-to-Negative Converter
design criteria step-down application also apply positive-to-negative converter. output voltage should limited |6.2 unless diode inserted series with (see Figure 16). Also, must again Schottky diode prevent excessive power dissipation ADP1173.
NEGATIVE-TO-POSITIVE CONVERSION
circuit Figure converts negative input voltage positive output voltage. Operation this circuit configuration similar step-up topology Figure except that current through feedback resistor level-shifted below ground transistor. voltage across (VOUT -VBEQ1). However, diode level-shifts base about below ground, thereby cancelling addition also reduces circuit's output voltage sensitivity temperature, which otherwise would dominated mV/°C contribution output voltage this circuit determined formula:
where ADP1173's duty cycle. When this relationship exists, inductor current does zero during time switch OFF. When switch turns next cycle, inductor current begins ramp from residual level. switch time remains constant, inductor current will increase high level (see Figure 19). This increases output ripple, require larger inductor capacitor. controlling switch current with ILIM resistor, output ripple current maintained design values. Figure illustrates action ILIM circuit.
1.245
Unlike positive step-up converter, negative-to-positive converter's output voltage either higher lower than input voltage.
RLIM
1N5818 2N3906 1N4148 POSITIVE OUTPUT
Figure (ILIM Operation, RLIM
ILIM
ADP1173
NEGATIVE INPUT
Figure Negative-to-Positive Converter
Figure (ILIM Operation, RLIM
-10-
REV.
ADP1173
internal structure ILIM circuit shown Figure ADP1173's internal power switch, which paralleled sense transistor relative sizes scaled that 0.5% IQ1. Current flows through internal resistor through RLIM resistor. These resistors parallel base-emitter junction oscillatordisable transistor, When voltage across RLIM exceeds turns terminates output pulse. only internal resistor used (i.e., ILIM connected directly VIN), maximum switch current will Figures gives RLIM values lower current-limit values.
ILIM RLIM (EXTERNAL) DRIVER OSCILLATOR (INTERNAL)
VBAT
ADP1173
1.245V
100k PROCESSOR
-1.245V
12.5µA BATTERY TRIP POINT
100k
Figure Setting Battery Detector Trip Point
Figure shows gain block configured battery monitor. Resistors should high values reduce quiescent current, high that bias current input causes large errors. value good compromise. value then calculated from formula:
LOBATT 1.245 1.245
Figure Current Limit Operation
where VLOBATT desired battery trip point. Since gain block output open-collector NPN, pull-up resistor should connected positive logic power supply.
delay through current limiting circuit approximately switch time reduced less than accuracy current trip-point reduced. Attempting program switch time less will produce spurious responses switch time. However, ADP1173 will still provide properly regulated output voltage.
PROGRAMMING GAIN BLOCK
VBAT
ADP1173
1.245mV
PROCESSOR
gain block ADP1173 used low-battery detector, error amplifier linear post regulator. gain block consists with inputs open-collector output. inverting input internally connected ADP1173's 1.245 reference, while noninverting input available pin. output transistor will sink about
1.6M
Figure Adding Hysteresis Battery Detector
REV.
-11-
ADP1173 Typical Circuit Applications
68µH
1N4148
1.5V CELLS
ILIM
2.21M 4.7µF 118k 0.1µF
BATTERY
ILIM
ADP1173-5
ADP1173
SENSE
47µH 100µF
1N5818
1N5818
1N5818
OUTPUT 150mA INPUT 50mA 6.5V INPUT
GOWANDA GA10-682K COILTRONICS CTX68-4 INPUT CHANGE CONVERTER WILL DELIVER -22V 40mA
22µF
220k -22V OUTPUT 2.0V INPUT EFFICIENCY
GOWANDA GA10-472K COILTRONICS CTX50-1 HIGHER OUTPUT CURRENTS ADP1073 DATASHEET
Figure Converter
Figure V-22 Bias Generator
+VIN 12V-28V
82µH
ILIM
ADP1173-5
1N5818
1.5V CELLS
ILIM
ADP1173-5
SENSE
SENSE
OUTPUT 150mA INPUT 60mA INPUT
220µH 100µF OUTPUT 300mA
100µF
1N5818 GOWANDA GA10-223K
GOWANDA GA10-822K
Figure Step-Up Converter
Figure Step-Down Converter
+VIN INPUT
22µF
ILIM
ADP1173-5
SENSE
100µH 100µF OUTPUT 75mA
1N5818 GOWANDA GA10-103K COILTRONICS CTX100-1
Figure Converter
-12-
REV.
ADP1173
44mH 44mH 500µH MUR110 100mA 390k 2N5400 IRF530
VN2222L 47µF 100V 3.6M 220µF
CTX110077 120µA
10nF
1N4148
ILIM 1N965B 10µF
ADP1173
110k
Figure Telecom Supply
100µH
1N5818
SI9405DY VOUT 100mA 2.6V
470µF NICAD ALKALINE CELLS
470k 470µF
ILIM
ADP1173
470µF
GOWANDA GA20-103K COILTRONICS CTX100-4 2.6V 7.2V
Figure Step-Up Step-Down Converter
20µH,
1N5820
100k 470µF 2N3906 2.2M NICAD
100k
301k 2N4403 OUTPUT 200mA LOCKOUT 1.85V INPUT MJE200 100k 470µF
ILIM
ADP1173
100k
COILTRONICS CTX-20-5-52 METAL FILM
Figure Step-Up Converter with Undervoltage Lockout
REV.
-13-
ADP1173
7V-24V
0.22 1N5818
MTM20P08 2N3904
25µH, 1N5820 470µF -VOUT -5.13*VC
ILIM
1/2W 1N4148 200k +5V)
ADP1173
OP196
GOWANDA GT10-100 EFFICIENCY 10mA ILOAD 500mA STANDBY 150µA
Figure Voltage Controlled Positive-to-Negative Converter
7V-24V
0.22 1N5818
MTM20P08 2N3904
25µH, 1N5820 470µF 500mA
ILIM
1/2W 40.2k 1N4148 121k
ADP1173
OPERATE STANDBY
GOWANDA GT10-100 EFFICIENCY 10mA ILOAD 500mA STANDBY 150µA
Figure High Power, Quiescent Current Step-Down Converter
-14-
REV.
ADP1173
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
8-Lead Plastic (N-8)
0.430 (10.92) 0.348 (8.84)
0.280 (7.11) 0.240 (6.10)
0.210 (5.33) 0.160 (4.06) 0.115 (2.93)
0.060 (1.52) 0.015 (0.38) 0.130 (3.30) SEATING PLANE
0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93)
0.022 (0.558) 0.100 0.070 (1.77) 0.014 (0.356) (2.54) 0.045 (1.15)
0.015 (0.381) 0.008 (0.204)
8-Lead Small Outline Package (SO-8)
0.1968 (5.00) 0.1890 (4.80)
0.1574 (4.00) 0.1497 (3.80)
0.2440 (6.20) 0.2284 (5.80)
0.0098 (0.25) 0.0040 (0.10)
0.0688 (1.75) 0.0532 (1.35)
0.0196 (0.50) 0.0099 (0.25)
SEATING PLANE
0.0500 0.0192 (0.49) (1.27) 0.0138 (0.35)
0.0098 (0.25) 0.0075 (0.19)
0.0500 (1.27) 0.0160 (0.41)
REV.
-15-
-16-
C2965-12-1/97
PRINTED U.S.A.
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