CMOS Micropower Step-Up Switching Regulator Maxim's MAX630 MAX419
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19-0915; 9/08
CMOS Micropower Step-Up Switching Regulator
Maxim's MAX630 MAX4193 CMOS DC-DC regulators designed simple, efficient, minimum-size DC-DC converter circuits range. MAX630 MAX4193 provide control power handling functions compact 8-pin package: 1.31V bandgap reference, oscillator, voltage comparator, 375mA N-channel output MOSFET. comparator also provided low-battery detection. Operating current only 70µA nearly independent output switch current duty cycle. logic-level input shuts down regulator less than quiescent current. Low-current operation ensures high efficiency even low-power battery-operated systems. MAX630 MAX4193 compatible with most battery voltages, operating from 2.0V 16.5V. devices compatible with Raytheon bipolar circuits, RC4191/2/3, while providing significantly improved efficiency low-voltage operation. Maxim also manufactures MAX631, MAX632, MAX633 DC-DC converters, which reduce external component count fixed-output 12V, circuits. Table this data sheet summary other Maxim DC-DC converters.
Features
High Efficiency-85% (typ) 70µA Typical Operating Current Maximum Quiescent Current 2.0V 16.5V Operation 525mA (Peak) Onboard Drive Capability ±1.5% Output Voltage Accuracy (MAX630) Low-Battery Detector Compact 8-Pin Mini-DIP Packages Compatible with RC4191/2/3
MAX630/MAX4193
Ordering Information
PART MAX630CPA MAX630CSA MAX630CJA MAX630EPA MAX630ESA MAX630EJA MAX630MJA MAX630MSA/PR MAX630MSA/PR-T MAX4193C/D MAX4193CPA MAX4193CSA MAX4193CJA MAX4193EPA MAX4193ESA MAX4193EJA MAX4193MJA TEMP RANGE +70°C +70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C -55°C +125°C -55°C +125°C -55°C +125°C +70°C +70°C +70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C -55°C +125°C PINPACKAGE PDIP CERDIP PDIP CERDIP CERDIP** Dice* PDIP CERDIP PDIP CERDIP CERDIP**
Applications
+15V DC-DC Converters High-Efficiency Battery-Powered DC-DC Converters DC-DC Converters Battery Life Extension Uninterruptible Power Supplies Switch-Mode Power Supplies
Typical Operating Circuit
470H
*Dice specified +25°C. Contact factory dice specifications. **Contact factory availability processing MIL-STD-883. Contact factory availibility.
Configuration
VIEW
+15V
MAX630
MAX630 MAX4193
47pF
+15V CONVERTER
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .18V Storage Temperature Range .-65°C +160°C Lead Temperature (soldering, 10s) .+300°C Operating Temperature Range MAX630C, MAX4193C.0°C +70°C MAX630E, MAX4193E .-40°C +85°C MAX630M, MAX4193M.-55°C +125°C Power Dissipation 8-Pin PDIP (derate 6.25mW/°C above +50°C).468mW 8-Pin (derate 5.88mW/°C above +50°C).441mW 8-Pin CERDIP (derate 8.33mW/°C above +50°C).833mW Input Voltage (Pins .-0.3V (+VS 0.3V) Output Voltage, .18V Output Current .525mA (Peak) Output Current .50mA
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(+VS +6.0V, +25°C, 5.0µA, unless otherwise noted.)
PARAMETER Supply Voltage Internal Reference Voltage Switch Current Supply Current Efficiency Line Regulation Load Regulation Operating Frequency Range Reference Internal Pulldown Resistance Reference Input Voltage Threshold Switch Current Switch Leakage Current Supply Current (Shutdown) Low-Battery Bias Current Capacitor Charging Current Threshold Voltage Threshold Voltage Input Bias Current Low-Battery Detector Output Current Low-Battery Detector Output Leakage ILBD ILBDO 0.4V, 1.1V 16.5V, 1.4V ILBR 1.0V 16.5V 0.01µA 0.5V0 (Note +5V, PLOAD 150mW (Note (Note 0.01 0.01 0.01 0.01 0.01 SYMBOL VREF 400mV CONDITIONS Operating Startup MAX630 1.29 1.31 0.08 0.01 0.01 0.01 0.01 0.01 1.33 16.5 1.24 1.31 0.06 MAX4193 16.5 1.38 UNITS VOUT VOUT
CMOS Micropower Step-Up Switching Regulator
ELECTRICAL CHARACTERISTICS
(+VS +6.0V, Full Operating Temperature Range, 5.0µA, unless otherwise noted.)
PARAMETER Supply Voltage Internal Reference Voltage Supply Current (Pin Line Regulation Load Regulation SYMBOL VREF 0.5V0UT V0UT (Note 0.5V0, 150mW (Note +70°C Reference Internal Pulldown Resistance -40°C +85°C -55°C +125°C Reference Input Voltage Threshold Switch Leakage Current Supply Current (Shutdown) Low-Battery Detector Output Current ILBD 16.5V 0.01µA 0.4V, 1.1V 0.45 CONDITIONS MAX630 1.25 1.31 0.01 16.5 1.37 0.45 1.20 1.31 0.01 MAX4193 16.5 1.42 UNITS VOUT VOUT
MAX630/MAX4193
Note Guaranteed correlation with pulse measurements. Note operating frequency range guaranteed design verified with sample testing.
Typical Operating Characteristics
+25°C, unless otherwise noted.)
ON-RESISTANCE TEMPERATURE
MAX630/4193 toc01
SUPPLY CURRENT TEMPERATURE
MAX630/4193 toc02
SUPPLY CURRENT SUPPLY VOLTAGE
MAX630/4193 toc03
2.5V
TEMPERATURE (°C)
TEMPERATURE (°C)
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193
Description
NAME FUNCTION Low-Battery Detection Comparator Input. output, sinks current whenever this below low-battery detector threshold, typically 1.31V. external capacitor connected between this terminal ground sets oscillator frequency. 47pF kHz. This drives external inductor. internal N-channel MOSFET that drives output resistance peak current rating 525mA. Ground positive supply voltage, from 2.0V 16.5V (MAX630). MAX630/MAX4193 shut down when this left floating driven below 0.2V. normal operation, connect directly drive high with either CMOS gate pullup resistor connected +VS. supply current typically 10nA shutdown mode output voltage external resistive divider connected from converter output ground. MAX630/MAX4193 pulse output whenever voltage this terminal less than 1.31V. Low-Battery Detector output open-drain N-channel MOSFET that sinks 600A (typ) whenever input, below 1.31V.
Detailed Description
operation MAX630 best understood examining voltage regulating loop Figure divide output voltage, which compared with 1.3V internal reference comparator COMP1. When output voltage lower than desired, comparator output goes high oscillator output pulses passed through gate latch, turning output N-channel MOSFET long output voltage less than desired voltage, drives inductor with series pulses oscillator frequency. Each time output N-channel MOSFET turned current through external coil, increases, storing energy coil. Each time output turns off, voltage across coil reverses sign voltage rises until catch diode, forward biased, delivering power output. When output voltage reaches desired level, 1.31V R2), comparator output goes inductor longer pulsed. Current then supplied filter capacitor, until output voltage drops below threshold, once again switched repeating cycle. average duty cycle directly proportional output current.
Output Driver Pin)
MAX630/MAX4193 output device large N-channel MOSFET with on-resistance peak current rating 525mA. well-known advantage that MOSFETs have over bipolar transistors switching applications higher speed, which reduces switching losses allows smaller, lighter, less costly magnetic components. Also important that MOSFETs, unlike bipolar transistors, require base current that, low-power DC-DC converters, often accounts major portion input power. operating current MAX630 MAX4193 increases approximately 1µA/kHz maximum power output charging current required gate capacitance output driver (e.g., 40µA increase 40kHz operating frequency). comparison, equivalent bipolar circuits typically drive their output device with base drive, causing bipolar circuit's operating current increase factor between load full load.
Oscillator
oscillator frequency single external, lowcost ceramic capacitor connected 47pF sets oscillator 40kHz, reasonable compromise between lower switching losses frequencies reduced inductor size higher frequencies.
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193
BATTERY INPUT INPUT 169k
100k COMP 1.31V
MAX630
LOW-BATTERY OUTPUT (LOW INPUT
40kHz COMP
47.5k 499k SHUTDOWN
1.31V BANDGAP REFERENCE BIAS GENERATOR
OPERATE
1N4148
470F
+15V OUTPUT 20mA
Figure +15V Converter Block Diagram
Low-Battery Detector
low-battery detector compares voltage with internal 1.31V reference. output, LBD, open-drain N-channel MOSFET. addition detecting warning battery voltage, comparator also perform other voltage-monitoring operations such power-failure detection. Another low-battery detector lower oscillator frequency when input voltage goes below specified level. Lowering oscillator frequency increases available output power, compensating decrease available power caused reduced input voltage (see Figure
MAX630's analog circuitry, oscillator, outputs turned off. device's quiescent current during shutdown typically 10nA (1µA max).
Bootstrapped Operation
most circuits, preferred source voltage MAX630 MAX4193 boosted output voltage. This often referred "bootstrapped" operation since circuit figuratively "lifts" itself on-resistance N-channel output decreases with increase +VS; however, device operating current goes with (see Typical Operating Characteristics, graph). circuits with very output current input voltages greater than more efficient connect directly input voltage rather than bootstrap.
Logic-Level Shutdown Input
shutdown mode entered whenever (pin driven below 0.2V left floating. When shut down,
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193
External Components
Resistors
Since input bias currents specified 10nA (max), current dividers R1/R2 R3/R4 (Figure without significantly affecting accuracy. Normally between which sets current voltage-dividers 1.3µA 130µA range. then calculated follows: -1.31V 1.31 -1.31V 1.31 where VOUT desired output voltage desired low-battery warning threshold. (shutdown) input pulled through resistor rather than connected directly current through pullup resistor should minimum with input-high threshold 1.3V: -1.3V diode (D1) well that load. inductance low, current exceed maximum rating. minimum allowed inductor value expressed LMIN
IMAX
where IMAX 525mA (peak current) on-time output. most common MAX630 circuit boost-mode converter (Figure When N-channel output device current linearly rises since: on-time (14µs 40kHz, dutycycle oscillator) current =150mA
energy coil
Inductor Value
available output current from DC-DC voltage boost converter function input voltage, external inductor value, output voltage, operating frequency. inductor must have correct inductance, able handle required peak currents, have acceptable series resistance core losses. inductance high, MAX630 will able deliver desired output power, even with output every oscillator cycle. available output power increased either decreasing inductance frequency. Reducing frequency increases on-period output, thereby increasing peak inductor current. available output power increased since proportional square peak inductor current (IPK). (VIN 2POUT LIpk
LIpk
5.25J
maximum load, this cycle repeated 40,000 times second, power transferred through coil 40,000 5.25 210mW. Since coil only supplies voltage above input voltage, 15V, DC-DC converter supply 210mW (15V 21mA. coil provides 210mW battery directly supplies another 105mW, total 315mW output power. load draws less than 21mA, MAX630 turns output only often enough keep output voltage constant 15V. Reducing inductor value increases available output current: lower increases peak current, thereby increasing available power. external inductor required MAX630 readily obtained from variety suppliers (Table Standard coils suitable most applications.
Types Inductors
Molded Inductors These cylindrically wound coils that look similar resistors. They have advantages cost ease handling, have higher resistance, higher losses, lower power handling capability than other types.
since POUT
where POUT includes power dissipated catch
CMOS Micropower Step-Up Switching Regulator
Potted Toroidal Inductors typical 1mH, 0.82 potted toroidal inductor (Dale TE3Q4TA) 0.685in diameter 0.385in high mounts directly onto board leads. Such devices offer high efficiency mounting ease, somewhat higher cost than molded inductors. Ferrite Cores (Pot Cores) cores very popular switch-mode inductors since they offer high performance ease design. coils generally wound plastic bobbin, which then placed between core sections. simple clip hold core sections together completes inductor. Smaller cores mount directly onto boards through bobbin terminals. Cores come wide variety sizes, often with center posts ground down provide gap. prevents saturation while accurately defining inductance turn squared. cores suitable DC-DC converters, usually used higher power applications. They also useful experimentation since easy wind coils onto plastic bobbins. Toroidal Cores volume production, toroidal core offers high performance, size weight, cost. They are, however, slightly more difficult prototyping, that manually winding turns onto toroid more tedious than plastic bobbins used with cores. Toroids more efficient given size since flux more evenly distributed than core, where effective core area differs between post, side, top, bottom. Since difficult toroid, manufacturers produce toroids using mixture ferromagnetic powder (typically iron Mo-Permalloy powder) binder. permeability controlled varying amount binder, which changes effective between ferromagnetic particles. Mo-Permalloy powder (MPP) cores have lower losses recommended highest efficiency, while iron powder cores lower cost.
MAX630/MAX4193
Diodes
most MAX630 circuits, inductor current returns zero before turns next output pulse. This allows slow turn-off diodes. other hand, diode current abruptly goes from zero full peak current each time switches (Figure D1). avoid excessive losses, diode must therefore have fast turn-on time. low-power circuits with peak currents less than 100mA, signal diodes such 1N4148s perform well. higher-current circuits, maximum efficiency power, 1N5817 series Schottky diodes recommended. Although 1N4001s other generalpurpose rectifiers rated high currents, they unacceptable because their slow turn-on time results excessive losses.
Table Coil Core Manufacturers
MANUFACTURER MOLDED INDUCTORS Dale Nytronics POTTED TOROIDAL INDUCTORS Dale Torotel Prod. FERRITE CORES TOROIDS Allen Bradley Siemens Magnetics Stackpole Magnetics T0451S100A B64290-K38-X38 555130 57-3215 G-41408-25 Tor. core, 500nH/T2 Tor. core, 4µH/T2 Tor. core, 53nH/T2 core, 14mm 18mm core, 250nH/T2 TE-3Q4TA MH-1 53-18 1mH, 0.82 600µH, 500µH, IHA-104 WEE-470 LL-500 500µH, 470µH, 500µH, 0.75 TYPICAL PART NUMBER DESCRIPTION
Note:
This list does constitute endorsement Maxim Integrated Products intended comprehensive list manufacturers these components.
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193
Filter Capacitor
output-voltage ripple components, with approximately degrees phase difference between them. component created change capacitor's stored charge with each output pulse. other ripple component product capacitor's charge/discharge current effective series resistance (ESR). With low-cost aluminum electrolytic capacitors, ESR-produced ripple generally larger than that caused change charge. VESR xESR(Voltsp where coil input voltage, inductance, oscillator frequency, equivalent series resistance filter capacitor. output ripple resulting from change charge filter capacitor where, tDIS PEAK and, IPEAK )(tDIS where tCHG tDIS charge discharge times inductor (1/2f used nominal calculations). When large values (>50k) used voltagesetting resistors, Figure stray capacitance input feedback response, destabilizing regulator, increasing lowfrequency ripple, lowering efficiency. This often avoided minimizing stray capacitance node. also remedied adding lead compensation capacitor 100pF 10nF parallel with Figure
DC-DC Converter Configurations
DC-DC converters come three basic topologies: buck, boost, buck-boost (Figure MAX630 usually operated positive-voltage boost circuit, where output voltage greater than input. boost circuit used where input voltage always less than desired output buck circuit used where input greater than output. buck-boost circuit inverts, used with, input
BOOST CONVERTER
VBATT
CONTROL SECTION
VOUT VBATT
Oscillator Capacitor,
oscillator capacitor, noncritical ceramic silver mica capacitor. also calculated 2.14 CINT (CINT 5pF, text)
BUCK CONVERTER
VBATT
CONTROL SECTION
VOUT VBATT
where desired operating frequency Hertz, CINT stray capacitance internal capacitance package. internal capacitance typically plastic package CERDIP package. Typical stray capacitances about normal board layouts, will significantly higher socket used. Bypassing Compensation Since inductor-charging current relatively large, high currents flow through ground connection MAX630/MAX4193. prevent unwanted feedback, impedance ground path must possible, supply bypassing should used device.
BUCK-BOOST CONVERTER
VBATT
CONTROL SECTION
|VOUT| VBATT
Figure DC-DC Converter Configurations
CMOS Micropower Step-Up Switching Regulator
voltages that either greater less than output. DC-DC converters also classified control method. most common pulse-width modulation (PWM) pulse-frequency modulation (PFM). switch-mode power-supply which currentmode control variant) well-established high-power off-line switchers. Both circuits control output voltage varying duty cycle. circuit, frequency held constant width each pulse varied. circuit, pulse width held constant duty cycle controlled changing pulse repetition rate. MAX630 refines basic employing constant-frequency oscillator. output MOSFET switched when oscillator high output voltages lower than desired. output voltage higher than desired, MOSFET output disabled that oscillator cycle. This pulse skipping varies average duty cycle, thereby controls output voltage. Note that, unlike ICs, which control element, MAX630 uses comparator compare output voltage onboard reference. This reduces number external components operating current.
MAX630/MAX4193
95.3k
330F
MAX630
47pF N.C. DIODES IN4148 220H PRIMARY CORE 330F
Figure ±15V Converter
cally varying from -13.6V -14.4V +15V load current changes from load 20mA.
Typical Applications
+15V DC-DC Converter
Figure shows simple circuit that generates +15V approximately 20mA from input. MAX630 ±1.5% reference accuracy, output voltage untrimmed accuracy ±3.5% resistors. Other output voltages also selected changing feedback resistors. Capacitor sets oscillator frequency (47pF 40kHz), while limits output ripple about 50mV. With low-cost molded inductor, circuit's efficiency about 75%, inductor with lower series resistance such Dale TE3Q4TA increases efficiency around 85%. high efficiency that MAX630 itself powered from +15V output. This provides onboard N-channel output device with gate drive, lowering on-resistance about When power first applied, current flows through supplying MAX630 with 4.4V startup.
2.5W, DC-DC Converter
Some systems, although battery powered, need high currents short periods, then shut down lowpower state. extra circuitry Figure designed meet these high-current needs. Operating buckboost flyback mode, circuit converts +5V. left side Figure similar Figure supplies gate drive external power MOSFET. This gate drive ensures that external device completely turned on-resistance. right side Figure buck-boost converter. This circuit advantage that when MAX630 turned off, output voltage falls unlike standard boost circuit, where output voltage VBATT 0.6V when converter shut down. When shut down, this circuit uses less than 10µA, with most current being leakage current power MOSFET. inductor output-filter capacitor values have been selected accommodate increased power levels. With values indicated, this circuit supply 500mA with efficiency. Since left side circuit powers only right-hand MAX630, circuit starts with battery voltages 1.5V, independent loading output.
±15V DC-DC Converter
circuit Figure similar that Figure except that more windings added inductor. 1408 (14mm 8mm) core specified standard size available from many manufacturers (see Table -15V output semiregulated, typi-
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193
Battery DC-DC Converter
common power-supply requirement involves conversion 2.4V battery voltage logic supply. circuit Figure converts 40mA with efficiency. When (pin driven low, output voltage will battery voltage minus drop across diode optional circuitry using lowers oscillator frequency when battery voltage falls 2.0V. This lower frequency maintains output-power capability circuit increasing peak inductor current, compensating reduced battery voltage. MAX630's low-battery detector monitors linepowered +5V, output used shut down unnecessary sections system during power failures. Alternatively, low-battery detector could monitor NiCad battery voltage provide warning power loss when battery nearly discharged. Unlike battery backup systems that batteries, this circuit does need +12V +15V recharge battery. Consequently, used provide backup modules circuit cards that only have available.
Battery Life Extender
Figure circuit provides minimum until battery voltage falls less than When battery voltage above MAX630's low, putting into shutdown mode that draws only 10nA. When battery voltage falls MAX8212 voltage detector's output goes high, enabling MAX630. MAX630 then maintains output voltage even battery voltage falls below used decrease oscillator frequency when battery voltage falls thereby increasing output current capability circuit.
Uninterruptable Supply
Figure MAX630 provides continuous supply regulated +5V, with automatic switchover between line power battery backup. When line-powered input voltage +5V, provides 4.4V MAX630 trickle charges battery. line-powered input falls below battery voltage, 3.6V battery supplies power MAX630, which boosts battery voltage +5V, thus maintaining continuous supply uninterruptable bus. Since output always supplied through MAX630, there power spikes glitches during power transfer.
+12V 1N4148 SHUTDOWN
OPERATE 499k
MAX630
280k
47pF
100k 1N5817
MAX630
0.5A
LITHIUM CELL
4069 47.6k
IRF543 470F
47pF
SECTION
SECTION
Figure High-Power Converter with Shutdown
CMOS Micropower Step-Up Switching Regulator
Note that this circuit (with without MAX8212) used provide from four alkaline cells. initial voltage approximately output maintained even when battery voltage falls less than output from battery. reference -15V output derived from positive output through Both regulators maximize output power low-battery voltage reducing oscillator frequency, through LBR, when VBATT falls 7.2V.
MAX630/MAX4193
Dual-Tracking Regulator
MAX634 inverting regulator combined with MAX630 Figure provide dual-tracking ±15V
LINE-POWERED INPUT 470H 249k 499k 100pF 47pF 1N4148 470F 1N5817 200k 540k 200k 100k 1N4001 470H 1N5817 UNINTERRUPTABLE OUTPUT 470F
MAX630
3.6V NICAD BATTERY
MAX630
100k 280k
47pF
POWER FAIL
Figure Converter with Low-Battery Frequency Shift
Figure Uninterruptable Supply
1.0mH
BATTERY 2.4M 1.3M
470F
MAX8212
HYST THRESHOLD
MAX630
390k
100pF
560k
47pF
Figure Battery Life Extension Down
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193
100k 100k INPUT, BATTERY
-12V, 15mA 150F
1N914 N.C. 250H VREF 100k
500H
IN914 330F
+12V, 45mA
MAX634
150pF 68pF
MAX630
100pF 47pF
Figure ±12V Dual-Tracking Regulator
Table Maxim DC-DC Converters
DEVICE ICL7660 MAX4193 MAX630 MAX631 MAX632 MAX633 MAX4391 MAX634 MAX635 MAX636 MAX637 MAX638 MAX641 MAX642 MAX643 DESCRIPTION Charge-Pump Voltage Inverter DC-DC Boost Converter DC-DC Boost Converter DC-DC Boost Converter DC-DC Boost Converter DC-DC Boost Converter DC-DC Voltage Inverter DC-DC Voltage Inverter DC-DC Voltage Inverter DC-DC Voltage Inverter DC-DC Voltage Inverter DC-DC Voltage Step-Down High-Power Boost Converter High-Power Boost Converter High-Power Boost Converter INPUT VOLTAGE 1.5V 2.4V 16.5V 2.0V 16.5V 1.5V 5.6V 1.5V 12.6V 1.5V 15.6V 16.5V 2.3V 16.5V 2.3V 16.5V 2.3V 16.5V 2.3V 16.5V 16.5V 1.5V 5.6V 1.5V 12.6V 1.5V 15.6V OUTPUT VOLTAGE -VIN VOUT VOUT +12V +15V -20V -20V -12V -15V VOUT +12V +15V COMMENTS regulated RC4193 source Improved RC4191 source Only external components Only external components Only external components RC4391 source Improved RC4391 source Only external components Only external components Only external components Only external components Drives external MOSFET Drives external MOSFET Drives external MOSFET
CMOS Micropower Step-Up Switching Regulator
Chip Topography Package Information
latest package outline information, www.maxim-ic.com/packages.
PACKAGE TYPE
MAX630/MAX4193
PACKAGE CODE P8-T S8-4 J8-2
DOCUMENT 21-0043 21-0041 21-0045
PDIP CERDIP
0.089" (2.26mm)
0.070" (1.78mm)
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193
Revision History
REVISION NUMBER REVISION DATE 9/08 DESCRIPTION Added information rugged plastic product PAGES CHANGED
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2008 Maxim Integrated Products registered trademark Maxim Integrated Products, Inc.
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