Micropower DC-DC Converter Adjustable Fixed ADP1073 ADP1073

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Micropower DC-DC Converter Adjustable Fixed ADP1073 ADP1073

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FEATURES Operates Supply Voltages from Ground Current Works Step-Up Step-Down Mode Very External Components Required Battery Detector On-Chip User-Adjustable Current Limit Internal Power Switch Fixed Adjustable Output Voltage Versions 8-Lead SO-8 Package APPLICATIONS Single-Cell Converters Laptop Palmtop Computers Pagers Cameras Battery Backup Supplies Cellular Telephones Portable Instruments mA-20 Loop Powered Instruments Hand-Held Inventory Computers
Micropower DC-DC Converter Adjustable Fixed ADP1073
ADP1073
GAIN BLOCK/ ERROR 212mV REFERENCE ILIM OSCILLATOR DRIVER
COMPARATOR
ADP1073
ADP1073-3.3 ADP1073-5 ADP1073-12
GAIN BLOCK/ ERROR 212mV REFERENCE OSCILLATOR DRIVER ILIM
GENERAL DESCRIPTION
ADP1073 part family step-up/step-down switching regulators that operates from input supply voltage little This extremely input voltage allows ADP1073 used applications requiring single cell battery primary power source. ADP1073 configured operate either step-up step-down mode input voltages greater than ADP1173 recommended. auxiliary gain amplifier serve battery detector linear regulator. Quiescent current ADP1073-5 only unloaded, making ideal systems where long battery life required. ADP1073 deliver from input voltage range 1.25 from input. Current limiting available adding external resistor.
COMPARATOR 904k
ADP1073-3.3: 62.1k ADP1073-5: ADP1073-12: 16.3k SENSE
ADP1073-3.3,
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: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 1997
ADP1073-SPECIFICATIONS
unless otherwise noted)
Symbol 1.15 3.30 5.00 12.00 fOSC 0.15 0.35 0.05 VCESAT IREV ILIM 1000 -0.3 12.6 12.6 3.47 5.25 12.6 0.15 1000 1500 Units %/°C -350
Parameter QUIESCENT CURRENT QUIESCENT CURRENT, STEP-UP MODE CONFIGURATION INPUT VOLTAGE
Conditions Switch Load, ADP1073-3.3 ADP1073-5 ADP1073-12, +25°C Step-Up Mode Step-Up Mode, +25°C Step-Down Mode ADP10731 ADP1073-3.3 ADP1073-52 ADP1073-122 ADP1073 ADP1073-3.3 ADP1073-5 ADP1073-12
COMPARATOR TRIP POINT VOLTAGE OUTPUT SENSE VOLTAGE
VOUT
3.14 4.75 11.4
COMPARATOR HYSTERESIS OUTPUT HYSTERESIS
OSCILLATOR FREQUENCY MAXIMUM DUTY CYCLE SWITCH TIME FEEDBACK BIAS CURRENT BIAS CURRENT OUTPUT REFERENCE LINE REGULATION SWITCH SATURATION VOLTAGE STEP-UP MODE ADP1073 VSET VREF +25°C TMIN TMAX +25°C TMIN TMAX +25°C TMIN TMAX
Full Load (VFB VREF)
ISET
ERROR GAIN REVERSE BATTERY CURRENT CURRENT LIMIT CURRENT LIMIT TEMPERATURE COEFFICIENT SWITCH-OFF LEAKAGE CURRENT MAXIMUM EXCURSION BELOW
+25°C Between ILIM +25°C
Measured +25°C ISW1 Switch +25°C
ILEAK VSW2
-400
NOTES This specification guarantees that both high trip point comparator fall within range. This specification guarantees that output voltage fixed versions will always fall within specified range. waveform sense will exhibit sawtooth shape comparator hysteresis. resistor connected between source pin. ADP1073 guaranteed withstand continuous application +1.6 applied pins while VIN, ILIM pins grounded. limits temperature extremes guaranteed correlation using standard Quality Control methods. Specifications subject change without notice.
REV.
ADP1073
ABSOLUTE MAXIMUM RATINGS FUNCTION DESCRIPTIONS
Input Supply Voltage, Step-Up Mode Input Supply Voltage, Step-Down Mode Voltage Voltage .-0.4 Feedback Voltage (ADP1073) Switch Current .1.5 Maximum Power Dissipation Operating Temperature Range +70°C Storage Temperature Range -65°C +150°C Lead Temperature (Soldering, sec) +300°C
CADDELL-BURNS 7200-12 1N5818 ILIM 1.5V CELL* 40mA
Mnemonic ILIM
Function normal conditions this connected VIN. When lower current limit required, resistor should connected between ILIM 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. step- down 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's positive input connected negative input connected reference. ADP1073 (adjustable) version this connected comparator input. ADP1073-3.3, ADP10735 ADP1073-12, goes directly internal application resistor that sets output voltage.
ADP1073-5
SENSE SANYO OS-CON
OPERATES WITH CELL VOLTAGE 1.0V *ADD DECOUPLING CAPACITOR BATTERY MORE THAN INCHES AWAY FROM ADP1073
Figure Typical Application
ORDERING GUIDE
Model* ADP1073AN ADP1073AR ADP1073AN-3.3 ADP1073AR-3.3 ADP1073AN-5 ADP1073AR-5 ADP1073AN-12 ADP1073AR-12
Output Voltage
Package Options** SO-8 SO-8 SO-8 SO-8
FB/SENSE
CONFIGURATIONS 8-Lead Plastic (N-8)
ILIM (SENSE)*
8-Lead Small Outline Package (SO-8)
ILIM (SENSE)*
NOTES **Temperature Range: +70°C. Plastic DIP; Small Outline Package.
ADP1073
VIEW (Not Scale)
VIEW (Not Scale)
ADP1073
FIXED VERSIONS
FIXED VERSIONS
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although ADP1073 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.
ADP1073 -Typical Performance Characteristics
1.5V (SAT) Volts 5.0V 3.0V 1.25V 1.0V SWITCH CURRENT Amps 2.0V SWITCH VOLTAGE Volts SWITCH CURRENT 0.05 SWITCH CURRENT Amps 1000 RLIM SATURATION VOLTAGE 1400 1200 1000 1.5V WITH WITH WITH
Figure Saturation Voltage Switch Current Step-Up Mode
Figure Switch Voltage Switch Current Step-Down Mode
Figure Maximum Switch Current RLIM
1000
BIAS CURRENT
SUPPLY CURRENT 1.5V TEMPERATURE
OUTPUT CURRENT
1.6V, RLIM
INPUT VOLTAGE Volts
TEMPERATURE
Figure Guaranteed Minimum Output Current VOUT Input Voltage
Figure Bias Current Temperature
Figure Supply Current Temperature
OSCILLATOR FREQUENCY TEMPERATURE DUTY CYCLE
SWITCH-ON TIME
34.5 33.5 32.5 31.5 30.5 TEMPERATURE TEMPERATURE
Figure Oscillator Frequency Temperature
Figure Duty Cycle Temperature
Figure Switch Time Temperature
REV.
ADP1073
2300 2100 GAIN BLOCK GAIN 1900 1700 1500 1300 1100 1.5V 100k
TEMPERATURE
Figure "Gain Block" Gain Temperature
THEORY OPERATION
ADP1073 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 ADP1073 shown front page. internal reference connected input comparator, while other input externally connected (via pin) feedback network connected regulated output. When voltage falls below oscillator turns driver amplifier provides base drive internal power switch switching action raises output voltage. When voltage exceeds oscillator shut off. While oscillator off, ADP1073 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. ADP1073 internal oscillator provides times, which ideal applications where ratio between VOUT roughly factor three (such generating from single cell). Wider range conversions, well step-down converters, also accomplished with slight loss maximum output power that obtained.
uncommitted gain block ADP1073 connected low-battery detector, linear post-regulator undervoltage lockout detector. inverting input gain block internally connected reference. noninverting input available pin. resistor divider, connected between with junction connected pin, causes output when input voltage goes below battery point. output open collector transistor that sink ADP1073 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 ADP1073 with external resistors. Three fixed-voltage models also available: ADP1073-3.3 (+3.3 ADP1073-5 ADP1073-12 (+12 fixed-voltage models identical ADP1073, except that laser-trimmed voltage-setting resistors included chip. Only three external components required form +3.3 converter. fixed-voltage models ADP1073, simply connect feedback (Pin directly output voltage. ADP1073 oscillator only turns when output voltage below programmed voltage. When output voltage above programmed voltage, ADP1073 remains quiescent state conserve power. Output ripple, which inherent gated oscillator converters, typically output output. This ripple voltage greatly reduced inserting gain-block between output pin. Further information typical circuit shown Programming Gain Block section.
REV.
ADP1073
COMPONENT SELECTION General Notes Inductor Selection
When ADP1073 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 ADP1073, output voltage higher, lower opposite polarity than input voltage. specify inductor ADP1073, 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 that excessive power will wasted heating windings. most ADP1073 applications, 1000 inductor with saturation current rating suitable. Ferrite core inductors that meet these specifications available small, surface-mount packages. minimize Electro-Magnetic Interference (EMI), toroid core type inductor recommended. core inductors lower cost alternative problem.
Calculating Inductor Value
where henrys switch equivalent resistance (typically +25°C) resistance inductor. voltage drop across switch small compared VIN, simpler equation used:
Replacing above equation with time ADP1073 typical) will define peak current given inductor value input voltage. this point, inductor energy calculated follows:
PEAK
previously mentioned, must greater than PL/fOSC ADP1073 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 alkaline batteries with end-of-life voltage. inductor power required from Equation
0.5V 87.5
each switching cycle, inductor must supply:
87.5
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
Since inductor power low, peak current also low. Assuming peak current starting point, Equation rearranged recommend inductor value:
L(MAX
Substituting standard inductor value with resistance, will produce peak switch current
PEAK
-2.0
step-up, boost, converter (Figure 15), inductor must store enough power make difference between input voltage output voltage. power that must stored calculated from equation:
IN(MIN IOUT
Once peak current known, inductor energy calculated from Equation
(470 (149 mA)2
where diode forward voltage 1N5818 Schottky). Energy only stored inductor while ADP1073 switch energy stored inductor each switching cycle must must equal greater than:
order ADP1073 regulate output voltage. When internal power switch turns current flow inductor increases rate
inductor energy greater than PL/f requirement inductor will work this application. optimum inductor value determined substituting other inductor values into same equations. When selecting inductor, peak current must exceed maximum switch current peak current must evaluated both minimum maximum values input voltage. switch current high when minimum, then limit exceeded maximum value VIN. this case, ADP1073's current
REV.
ADP1073
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 limited only resistance inductor forward voltage diode.
Inductor Selection-Step-Down Converter
avoid exceeding maximum switch current when input voltage RLIM resistor should specified.
Inductor Selection-Positive-to-Negative Converter
configuration positive-to-negative converter using ADP1073 shown Figure with step-up converter, output power inverting circuit must supplied inductor. required inductor power derived from formula:
OUT|+V IOUT
step-down mode operation shown Figure Unlike step-up mode, ADP1073's power switch does saturate when operating step-down mode. Switch current should therefore limited best performance this mode. input voltage will vary over wide range, ILIM used limit maximum switch current. first step selecting step-down inductor calculate peak switch current follows:
PEAK IOUT
ADP1073 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) 0.75
where duty cycle (0.72 ADP1073) 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
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:
21.7
Using standard inductor value with resistance, will produce peak switch current
PEAK
-1.65 4.5V 0.75V 0.65
where switch time input voltage will vary (such application which must operate from battery), 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. example, assume that +3.3 required from battery with end-of-life voltage. Deriving peak current from Equation yields:
PEAK 0.72
Once peak current known, inductor energy calculated from Equation
(330 (393 mA)2 25.5
inductor energy 25.5 greater than PL/f requirement 21.7 inductor will work this application. input voltage varies between only this example. Therefore, peak current will change enough require RLIM resistor ILIM connected directly VIN. Care should taken, course, ensure that peak current does exceed
peak current than inserted into Equation calculate inductor value:
-1.5 =144
Since standard value, next lower standard value would specified.
REV.
ADP1073
Capacitor Selection optimum performance, ADP1073'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 ADP1073 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 device. this case output jumps about which indicates 0.07 Figure shows OS-CON series capacitor same circuit, only 0.02
Figure OS-CON Capacitor
output ripple important, user should consider using 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.
Diode Selection
specifying diode, consideration must given speed, forward voltage drop reverse leakage current. When ADP1073 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 ADP1073. This diode leakage fast turn-on turn-off times. surface mount version, MBRS130T3, also available. applications where ADP1073 "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 ADP1073 delivers power, lower leakage outweigh reduction efficiency. switch currents less, Schottky diode such BAT85 provides leakage less than similar device, BAT54, available SOT-23 package. Even lower leakage, range, obtained with 1N4148 signal diode. General purpose rectifiers, such 1N4001, suitable ADP1073 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 ADP1073 circuit appears function with 1N4001, resulting performance will indicative circuit performance when correct diode used. REV.
Figure Aluminum Electrolytic
Figure Tantalum Electrolytic
ADP1073
Circuit Operation, Step-Up (Boost) Mode
boost mode, ADP1073 produces output voltage that higher than input voltage. example, derived from alkaline cell (+1.5 generated from logic power supply. Figure shows ADP1073 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 VCE(SAT) current begins flow through This current reaches final value (ignoring second-order effects)
ILIM
VOUT 1N5818
ADP1073
Figure Step-Down Mode Operation
PEAK
CE(SAT
where ADP1073 switch's "on" time.
VOUT
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 ADP1073'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 ADP1073. output voltage buck regulator back ADP1073's resistors When voltage falls below internal power switch turns "on" again cycle repeats. output voltage formula:
ILIM
ADP1073
*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 ADP1073 resistors When voltage falls below turns "on" again cycle repeats. output voltage therefore formula:
output voltage should limited less when using ADP1073 step-down mode. input voltage ADP1073 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
circuit Figure shows direct current path from VOUT, inductor Therefore, boost converter protected output short circuited ground.
Circuit Operation, Step-Down (Buck) Mode)
ADP1073's step-down mode used produce output voltage that lower than input voltage. example, output four NiCd cells (+4.8 converted +3.3 logic supply. typical configuration step-down operation ADP1073 shown Figure this case, collector internal power switch connected emitter drives inductor. When switch turns pulled toward VIN. This forces voltage across equal (VIN VOUT, causes current flow This current reaches final value
PEAK
ADP1073 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 ADP1073's internal power switch turns off, current flowing inductor forces output (-VOUT) negative
ILIM
ADP1073
1N5818 VOUT
where ADP1073 switch's "on" time.
Figure Positive-to-Negative Converter potential. ADP1073 will continue turn switch until above pin, output voltage determined formula:
REV.
ADP1073
design criteria step-down application also apply positive-to-negative converter. output voltage should limited |6.2 must Schottky diode prevent excessive power dissipation ADP1073.
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 VBE(Q1)). However, diode level-shifts base about below ground, thereby cancelling addition also reduces circuit's output voltage sensitivity temperature, which would otherwise dominated mV/°C contribution output voltage this circuit determined formula:
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.
Unlike positive step-up converter, negative-to-positive converter's output voltage either higher lower than input voltage.
RLIM ILIM 1N5818 POSITIVE OUTPUT 2N3906 1N4148
Figure Operation, RLIM
ADP1073
NEGATIVE INPUT
Figure Negative-to-Positive Converter
Limiting Switch Current
Figure Operation, RLIM
ADP1073'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 ADP1073 limits switch current thereby protects switch, output ripple will increase. Selecting proper resistor will limit switch current even increases. relationship between RLIM maximum switch current shown Figure ILIM feature also valuable controlling inductor current when ADP1073 goes into continuous conduction mode. This occurs step-up mode when following condition met:
DIODE
internal structure ILIM circuit shown Figure ADP1073'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 Figure gives RLIM values lower current-limit values. 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, ADP1073 will still provide properly regulated output voltage.
where ADP1073's duty cycle. When this relationship exists, inductor current does zero during time that switch OFF. When -10- REV.
ADP1073
RLIM (EXTERNAL) DRIVER OSCILLATOR ILIM VBAT 1.6M
ADP1073
212mV
ADP1073
(INTERNAL)
PROCESSOR
Figure Current Limit Operation
Programming Gain Block
Figure 22b. Adding Hysteresis Battery Detector
gain block ADP1073 used battery detector, error amplifier linear post regulator. gain block consists with inputs open-collector output. inverting input internally connected ADP1073's reference, while noninverting input available pin. output transistor will sink about Figure shows gain block configured low-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
circuit Figure produce multiple pulses when approaching trip point, noise coupled into input. prevent multiple interrupts digital logic, hysteresis added circuit (Figure 22b). Resistor RHYS, with value provides hysteresis. addition RHYS will change trip point slightly, value will
LOBATT
where logic power supply voltage, pull-up resistor creates hysteresis. gain block also used control element reduce output ripple. ADP3000 normally recommended lowripple applications, minimum input voltage gain-block technique using ADP1073 useful stepup converters operating down step-up converter using this technique shown Figure This configuration uses gain block sense output voltage control comparator. result that comparator hysteresis reduced open loop gain gain block. Output ripple reduced only millivolts with this technique, versus typical value converter using just comparator. best results, large output capacitor (1000 more) should specified. This technique also used step-down inverting applications, ADP3000 usually more appropriate choice. ADP3000 data sheet further details.
680k VBAT VOUT ILIM
where VLOBATT desired battery trip point. Since gain block output open-collector NPN, pull-up resistor should connected positive logic power supply.
VBAT
ADP1073
212mV
100k PROCESSOR
(212mV
BATTERY TRIP POINT
Figure 22a. Setting Battery Detector Trip Point
ADP1073
VOUT
(212mV)
Figure Using Gain Block Reduce Output Ripple
REV.
-11-
ADP1073 -Typical Application Circuits
+12V VSET *NON-POLARIZED GOWANDA GA10-123k CADDELL-BURNS 7300-14 ILIM OUTPUT VBATTERY 1.0V 12mA VBATTERY 1.5V 1N5818
ADP1073 CIRCUIT
VOLT CELL
ADP1073-12 SENSE
Figure Test Circuit Measures Load Quiescent Current ADP1073 Converter
1.00M ILIM 23.3k VOLT CELLS 1N5818 OUTPUT VBATTERY 1.00V 12mA VBATTERY 1.5V
Figure Step-Up Converter
1N5818 OUTPUT 25mA VBATTERY 2.0V
VOLT CELL
ADP1073
ILIM
ADP1073-12 SENSE
GOWANDA GA10-123k CADDELL-BURNS 7300-14 **1% METAL FILM
GOWANDA GA10-682k CADDELL-BURNS 7300-11
Figure Step-Up Converter
Figure Step-Up Converter
1N5818 OUTPUT 20mA VBATTERY 2.0V
1N5818 OUTPUT 100mA VBATTERY 2.0V 1.00M VOLT CELLS ILIM 14.3k
VOLT CELLS
ILIM
ADP1073
ADP1073-5 SENSE
GOWANDA GA10-682k CADDELL-BURNS 7300-11
GOWANDA GA10-682k CADDELL-BURNS 7300-11 **1% METAL FILM
Figure Step-Up Converter
536k VOLT CELL ILIM 40.2k 1N5818 OUTPUT 15mA VBATTERY 1.00V
Figure Step-Up Converter
1N5818 OUTPUT 100mA 14.3k
ILIM
ADP1073
ADP1073
GOWANDA GA10-123k CADDELL-BURNS 7300-14 **1% METAL FILM
GOWANDA GA10-153k CADDELL-BURNS 7200-15 **1% METAL FILM
Figure Step-Up Converter
Figure Step-Up Converter
-12-
REV.
ADP1073
OUTPUT 1N5818 OUTPUT 100mA 536k ILIM ILIM VOLT BATTERY
ADP1073
ADP1073-12 SENSE
40.2k
GOWANDA GA20-153k CADDELL-BURNS 7200-15
1N5818 GOWANDA GA10-103k CADDELL-BURNS 7300-13
Figure Step-Up Converter
1N5818 OUTPUT ILIM VOLT CELL 40.2k 1N4148 909k VOLT BATTERY
Figure Step-Down Converter
ADP1073
ILIM
SENSE
ADP1073-5
SHUTDOWN
OPERATE 74C04 1N5818
OUTPUT
GOWANDA GA10-822k CADDELL-BURNS 7200-12 **1% METAL FILM
Figure Step-Up Converter with Logic Shutdown
1N5818 OUTPUT 442k VOLT CELL 100k
GOWANDA GA10-103k CADDELL-BURNS 7300-13
Figure Step-Down Converter
1N5818 OUTPUT 25mA
ILIM
SENSE
100k BATT GOES VBATTERY 1.15V
2N3906
ADP1073-5
VOLT CELL
ILIM
ADP1073-5 SENSE
GOWANDA GA10-822k CADDELL-BURNS 7300-12 **1% METAL FILM
Figure Step-Up Converter with Battery Detector
GOWANDA GA10-472k CADDELL-BURNS 7300-14 MINIMUM START-UP VOLTAGE 1.1V
Figure Bootstrapped Step-Up Converter
REV.
-13-
ADP1073
MAIN SUPPLY MEMORY 4.5V WHEN MAIN SUPPLY OPEN 680k 1N5818 ILIM ILIM 806k 40.2k GOWANDA GA10-473k CADDELL-BURNS 7300-21 **1% METAL FILM EFFICIENCY LOAD
1N5818 OUTPUT VBATTERY 1.00V 10mV RIPPLE OS-CON 40.2k
909k
VOLT CELL F***
VOLT CELL
ADP1073
ADP1073
GOWANDA GA10-822k CADDELL-BURNS 7300-12 **1% METAL FILM ***OPTIONAL
Figure Memory Backup Supply
1N5818 909k VOLT CELL 100k 100k 2N3906 2.2M ILIM OUTPUT 100mA LOCKOUT 1.6V
Figure Very Noise Step-Up Converter
6.5V 680k ILIM
ADP1073
1N5818 OS-CON
ADP1073
40.3k
5VOUT 90mA 6.5VIN 900k
100k
GOWANDA GA10-682k CADDELL-BURNS 7300-11 **1% METAL FILM
GOWANDA GA10-472k CADDELL-BURNS 7300-09 **1% METAL FILM EFFICIENCY 130µA OUTPUT RIPPLE 100mV
40.2k
Figure Step-Up Converter with Undervoltage Lockout
680k ILIM VOLT CELL 909k OS-CON 40.2k 1N5818 OUTPUT 20mV RIPPLE
Figure Reduced Noise Step-Down Converter
1000 OUTPUT +6V, 560k ILIM 549k 2200 1N5820
INPUT LITHIUM CELLS)
ADP1073
ADP1073
GOWANDA GA10-822k CADDELL-BURNS 7300-12 **1% METAL FILM
1N5818
MTP3055EL 2N3906
Figure Noise Step-Up Converter
5.1k
COILTRONICS CTX25-5-52 **1% METAL FILM
Figure Step-Up Converter
-14-
REV.
ADP1073
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-
C2965-8-10/97
PRINTED U.S.A.

Micropower DC-DC Converter Adjustable Fixed ADP1073 ADP1073

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