Micropower Cost Fixed Adjustable DC-to-DC Converter ADP1109A SENS

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Micropower Cost Fixed Adjustable DC-to-DC Converter ADP1109A SENS

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FEATURES Operates Supply Voltages Fixed Adjustable Output Minimum External Components Required Ground Current: Oscillator Frequency: Logic Shutdown 8-Lead SO-8 Packages APPLICATIONS Cellular Telephones Single-Cell Converters Laptop Palmtop Computers Pagers Cameras Battery Backup Supplies Portable Instruments Laser Diode Drivers Hand-Held Inventory Computers
Micropower Cost Fixed Adjustable DC-to-DC Converter ADP1109A
SENSE 250k COMPARATOR 1.25V REFERENCE 120kHz OSCILLATOR DRIVER
ADP1109A-3.3: 152k ADP1109A-5: ADP1109A-12:
SHUTDOWN
PGND
ADP1109A
COMPARATOR
120kHz OSCILLATOR DRIVER
GENERAL DESCRIPTION
1.25V REFERENCE
ADP1109A versatile step-up switching regulator. device requires only minimal external components operate complete switching regulator. ADP1109A-5 deliver from input ADP1109A-12 deliver from input. device also features logic controlled shutdown capability that, when logic applied, will shut down oscillator. operating frequency allows small surface mount components. gated oscillator capability eliminates need frequency compensation.
SHUTDOWN
PGND
TYPICAL APPLICATION
SENSE
ADP1109A-12
VOUT 60mA
SHUTDOWN PGND
SHUTDOWN/PROGRAM
Flash Memory Generator
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
ADP1109A-SPECIFICATIONS
unless otherwise noted)
1.20 1.25 VOUT 3.13 4.75 11.45 3.30 5.00 12.00 fOSC 1.30 12.5 3.47 5.25 12.55 Units
Parameter QUIESCENT CURRENT INPUT VOLTAGE COMPARATOR TRIP POINT VOLTAGE COMPARATOR HYSTERESIS OUTPUT VOLTAGE ADP1109A-3.3 ADP1109A-5 ADP1109A-12 OUTPUT VOLTAGE RIPPLE
Conditions Switch
ADP1109A ADP1109A-3.3 ADP1109A-5 ADP1109A-12
OSCILLATOR FREQUENCY DUTY CYCLE SWITCH-ON TIME SWITCH SATURATION VOLTAGE ADP1109A-3.3 ADP1109A-5 ADP1109A-12 SWITCH LEAKAGE CURRENT SHUTDOWN HIGH SHUTDOWN SHUTDOWN INPUT CURRENT SHUTDOWN INPUT CURRENT VSHUTDOWN VSHUTDOWN +25°C Full Load
VCESAT
NOTES limits temperature extremes guaranteed correlation using standard quality control methods. Specifications subject change without notice.
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage, VOUT -0.4 Voltage -0.4 Shutdown Voltage Switch Current Maximum Power Dissipation Operating Temperature Range +70°C Storage Temperature Range -65°C +150°C Lead Temperature (Soldering, sec) +300°C
*This stress rating only; operation beyond these limits cause device permanently damaged.
REV.
ADP1109A
FUNCTION DESCRIPTIONS CONFIGURATIONS 8-Lead Plastic (N-8)
Mnemonic PGND SHUTDOWN FB(SENSE)
Function Input Supply Voltage. Connection. Collector Node Power Transistor. Power Ground. Ground. Connection. When logic applied this pin, oscillator shut down. ADP1109A (Adjustable), this goes directly comparator input. ADP1109A-3.3, ADP1109A-5 ADP1109A-12, this connected through internal resistor that sets output voltage.
ORDERING GUIDE
FB(SENSE)*
SHUTDOWN VIEW (Not Scale) PGND
ADP1109A
*FIXED VERSIONS CONNECT
8-Lead SOIC (SO-8)
PGND
FB(SENSE)* SHUTDOWN
ADP1109A
VIEW (Not Scale)
Model ADP1109AAN ADP1109AAR ADP1109AAN-3.3 ADP1109AAR-3.3 ADP1109AAN-5 ADP1109AAR-5 ADP1109AAN-12 ADP1109AAR-12
Output Voltage
Package Description Plastic Small Outline Plastic Small Outline Plastic Small Outline Plastic Small Outline
Package Options SO-8 SO-8 SO-8 SO-8
*FIXED VERSIONS CONNECT
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although ADP1109A 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.
ADP1109A
3.3V
MBRS130T3 60mA
MBRS130T3 2N4403
SENSE
SENSE
ADP1109A-12
ADP1109A-12
SHUTDOWN PGND
SHUTDOWN PGND
VOUT 110mA
SHUTDOWN
SHUTDOWN *COILTRONICS CTX20-1 SUMIDA CD54-220LC **AVX SERIES
*COILTRONICS CTX33-2 SUMIDA CD54-330LC **AVX SERIES
Figure Powered Flash Memory Generator
Figure Converter With Shutdown Output
MBRS130T3
MBRS130T3 35mA
SENSE
ADP1109A-12
250k 40.3k
ADP1109A
VOUT
SHUTDOWN PGND
SHUTDOWN
SHUTDOWN
SHUTDOWN *COILTRONICS CTX10-1 SUMIDA CD54-100LC **AVX SERIES
*COILTRONICS CTX33-2 SUMIDA CD54-330LC **AVX SERIES
Figure Powered Flash Memory Generator
Figure Converter
MBRS130T3 110mA
SENSE
ADP1109A-5
SHUTDOWN PGND
SHUTDOWN *COILTRONICS CTX10-1 SUMIDA CD54-100LC **AVX SERIES
Figure Converter
REV.
ADP1109A
OSCILLATOR FREQUENCY
SATURATION VOLTAGE
DUTY CYCLE
TEMPERATURE
TEMPERATURE
ISWITCH CURRENT
Figure Oscillator Frequency Temperature
Figure Duty Cycle Temperature
Figure Saturation Voltage ISWITCH Current Step-Up Mode
0.60 0.55 0.50 0.45
VCE(SAT)
VCE(SAT) 0.65A
SWITCH-ON TIME
TEMPERATURE
QUIESCENT CURRENT
0.40 0.35 0.30 0.25 0.20 0.15 0.10 TEMPERATURE
TEMPERATURE
Figure Switch Saturation Voltage Temperature
Figure Switch-On Time Temperature
Figure Quiescent Current Temperature
12.20 12.15 12.10
OUTPUT VOLTAGE QUIESCENT CURRENT
12.05 12.00 11.95 11.90 11.85 11.80 11.75 11.70 TEMPERATURE
INPUT VOLTAGE Volts
Figure Output Voltage Temperature
Figure Quiescent Current Input Voltage
REV.
ADP1109A
APPLICATION INFORMATION
THEORY OPERATION
considered battery powered similar applications where input voltage varies. minimize Electro-Magnetic Interference (EMI), toroid core type inductor recommended. core inductors lower-cost alternative problem.
Calculating Inductor Value
ADP1109A flexible, power switch-mode power supply (SMPS) controller step-up dc/dc converter applications. This device uses gated-oscillator technique provide very high performance with quiescent current. example, more than output power generated from source, while quiescent current only functional block diagram ADP1109A shown front page. internal 1.25 reference connected input comparator, while other input externally connected (via pin) feedback network connected regulated output. When voltage falls below 1.25 oscillator turns driver amplifier provides base drive internal power switch, switching action raises output voltage. When voltage exceeds 1.25 oscillator shut off. While oscillator off, ADP1109A quiescent current only comparator includes small amount hysteresis, which ensures loop stability without requiring external components frequency compensation. shutdown feature permits oscillator shut off. Holding SHUTDOWN will disable oscillator, ADP1109A's quiescent current will remain output voltage ADP1109A with external resistors. Three fixed-voltage models also available: ADP1109A-3.3 (+3.3 ADP1109A-5 ADP1109A-12 (+12 fixed-voltage models identical ADP1109A, except that laser-trimmed voltage-setting resistors included chip. fixed-voltage models ADP1109A, simply connect SENSE (Pin directly output voltage.
COMPONENT SELECTION General Notes Inductor Selection
Selecting proper inductor value simple step process: Define operating parameters: minimum input voltage, maximum input voltage, output voltage output current. Calculate inductor value, using equations following section.
Inductor Selection
step-up, boost, converter (Figure inductor must store enough power make difference between input voltage output voltage. inductor power calculated from equation: VOUT -VIN IOUT
where diode forward voltage 1N5818 Schottky). Energy only stored inductor while ADP1109A switch energy stored inductor each switching cycle must must equal greater than:
order ADP1109A regulate output voltage. When internal power switch turns current flow inductor increases rate
When ADP1109A internal power switch turns current begins flow inductor. Energy stored inductor core while switch this stored energy then transferred load when switch turns off. specify inductor ADP1109A, proper values inductance, saturation current resistance must determined. This process difficult, specific equations 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 ADP1109A applications, inductor with saturation current rating resistance <0.4 suitable. Ferrite core inductors that meet these specifications available small, surface-mount packages. Air-core inductors, well chokes, unsuitable because their peak current ratings. ADP1109A designed applications where input voltage fairly stable, such generating from logic supply. ADP1109A does have internal switch current limiting circuit, inductor saturate input voltage high. ADP1111 ADP3000 should
where Henrys switch equivalent resistance (typically +25°C) resistance inductor. most applications, voltage drop across switch small compared simpler equation used:
Replacing above equation with time ADP1109A (5.5 typical) will define peak current given inductor value input voltage. this point, inductor energy calculated follows:
peak
previously mentioned, must greater than PL/fOSC that ADP1109A 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. REV.
ADP1109A
practice, inductor value easily selected using equations above. example, consider supply that will generate from source. inductor power required from Equation (120 each switching cycle, inductor must supply:
Capacitor Selection
optimum performance, ADP1109A'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.
Diode Selection
required inductor power fairly this example, peak current also low. Assuming peak current starting point, Equation rearranged recommend inductor value: 45.8
Substituting standard inductor value with resistance, will produce peak switch current PEAK
-1.0
Once peak current known, inductor energy calculated from Equation
specifying diode, consideration must given speed, forward voltage drop reverse leakage current. When ADP1109A 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 ADP1109A. This diode leakage, fast turn-on turn-off times. surface mount version, MBRS130T3, also available. 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 ADP1109A 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 ADP1109A circuit appears function with 1N4001, resulting performance will indicative circuit performance when correct diode used.
inductor energy greater than PL/fOSC requirement inductor will work this application. substituting other inductor values into same equations, optimum inductor value selected. When selecting inductor, peak current must exceed maximum switch current calculated peak current greater than either input voltage must increased load current decreased.
Output Voltage Selection
output voltage back ADP1109A resistors (Figure When voltage comparator's inverting input falls below 1.25 oscillator turns "on" output voltage begins rise. output voltage therefore formula:
VOUT 1.25
Resistors provided internally fixed-voltage versions ADP1109A. this case, complete dc-dc converter requires only four external components.
REV.
ADP1109A
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
0.430 (10.92) 0.348 (8.84)
0.1968 (5.00) 0.1890 (4.80)
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)
0.1574 (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)
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)
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.
PRINTED U.S.A.
C3183-8-10/97
8-Lead Plastic (N-8)
8-Lead SOIC (SO-8)

Micropower Cost Fixed Adjustable DC-to-DC Converter ADP1109A SENS

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