19-3048; Rev 0; 10/03
Low-Input-Voltage, 500mA LDO Regulator
with RESETin SOT and TDFN
General Description
FeaturesThe MAX1589 low-dropout linear regulator operatesofrom a +1.62V to +3.6V supply and delivers a guaran-teed 500mA continuous load current with a low 175mVoLow 1.62V Minimum Input Voltagedropout. The high-accuracy (±0.5%) output voltage isoGuaranteed 500mA Output Currentpreset to internally trimmed voltages from +0.75V too±0.5% Initial+3.0V. An active-low, open-drain reset output remainsoLow 175mV Dropout at 500mA LoadAccuracy
asserted for at least 70ms after the output voltage reach-o70ms Supply Current Independent of Load and DropoutRESETOutput Flag
es regulation. This device is offered in 6-pin thin SOT23Voltage
and 6-pin 3mm x 3mm thin DFN packages.
oLogic-Controlled Shutdown
An internal PMOS pass transistor maintains low supplyoThermal-Overload and Short-Circuit Protectioncurrent, independent of load and dropout voltage, makingoPreset Output Voltages (0.75V, 1.0V, 1.3V, 1.5V,the MAX1589 ideal for portable battery-powered equip-1.8V, 2.5V, and 3.0V)
ment such as personal digital assistants (PDAs), digitaloTiny 6-Pin Thin SOT23 Package (<1.1mm High)still cameras, cell phones, cordless phones, and note-o
Thin 6-Pin TDFN Package (<0.8mm High)
book computers. Other features include logic-controlledshutdown, short-circuit protection, and thermal-Ordering Information
overload protection.
PART*TEMP RANGEPIN-PACKAGEMAX1589EZT_ _ _-T-40°C to +85°C6 Thin SOT23-6MAX1589ETA_ _ _-40°C to +85°C6 TDFN*Insert the desired three-digit suffix (see the Selector Guide) intoApplications
the blanks to complete the part number. Contact the factory forother output voltages.
Notebook ComputersSelector Guide
Cellular and PCS TelephonesMAX1589Personal Digital Assistants (PDAs)VOUT (V)SUFFIX TOP MARKHand-Held ComputersSOTTDFNDigital Still Cameras0.75075AAATAFJPCMCIA Cards1.00100AAAUAFKCD and MP3 Players
1.30130AAAVAFL1.50150AAAWAFM1.80180AAAXAFN2.50250AAAYAFO3.00300AAAZAFPTypical Operating Circuit
Pin ConfigurationsINPUTTOP VIEW1.62V TO 3.6VOUTPUT500mA0.75V TO 3.0VCINOUTINCOUT1µF4.7µFIN 16OUTOUT16LOGICINMAX1589SUPPLYMAX1589I.C.2100kΩGND2MAX15895SHDN5I .C.ONRESET34GNDSHDNRESET TO µCOFFSHDN34RESETGNDTDFN3mm x 3mmTHIN SOT23________________________________________________________________Maxim Integrated Products1
For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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Low-Input-Voltage, 500mA LDO Regulatorwith RESETin SOT and TDFNMAX1589ABSOLUTE MAXIMUM RATINGS
IN, SHDN, RESETto GND.....................................-0.3V to +4.0VOUT to GND................................................-0.3V to (VIN+ 0.3V)Output Short-Circuit Duration.....................................ContinuousContinuous Power Dissipation (TA= +70°C)
6-Pin Thin SOT23 (derate 9.1mW/°C above +70°C)....727mW6-Pin TDFN (derate 24.4mW/°C above +70°C).........1951mW
Operating Temperature Range...........................-40°C to +85°CJunction Temperature.....................................................+150°CStorage Temperature Range.............................-65°C to +150°CLead Temperature (soldering, 10s).................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN= (VOUT+ 0.5V) or VIN= 1.8V, whichever is greater; SHDN= IN, CIN= 1µF, COUT= 4.7µF, TA= -40°C to +85°C, unless other-wise noted. Typical values are at TA= +25°C.) (Note 1)PARAMETERInput VoltageInput Undervoltage LockoutOutput Voltage AccuracyMaximum Output CurrentCurrent LimitGround CurrentDropout VoltageLoad RegulationLine RegulationOutput NoisePSRRSHUTDOWNShutdown Supply CurrentSHDN Input Logic LevelsSHDN Input Bias CurrentTurn-On DelayRESET OUTPUTReset Threshold AccuracyRESET Output Low VoltageVOLVOUT falling (1.7% typical hysteresis)I RESET = 100µAVIN = +1.0V, I RESET = 100µA8082.51.5385100100%VOUTmVIOFFVIHVILISHDNSHDN = GNDVIN = 1.62V to 3.6VVIN = 1.62V to 3.6VV = 0 or 3.6VS H DN TA = +25°CTA = +85°C1590TA = +25°CTA = +85°C1.40.63000.0010.011µAVnAµsIOUTILIMIQVIN - VOUT∆VLDR∆VLNRSYMBOLVINVUVLOVIN rising (180mV typical hysteresis)IOUT = 150mA, TA = +25°CIOUT = 1mA to 500mA,VIN = (VOUT + 0.5V) to +3.6VContinuousVOUT = 96% of nominal valueNo loadIOUT = 500mADropout (Note 2)IOUT = 500mA, VOUT ≥ 1.8V (Note 2)IOUT = 1mA to 500mAVIN = (VOUT + 0.5V) to +3.6V, IOUT = 100mA10Hz to 100kHz, IOUT = 10mAf < 1kHz, IOUT = 10mA-0.15CONDITIONSMIN1.621.30-0.5-1.55005508507090701750.02+0.0186703500.5+0.15mV%% / V µVRMSdB1150140µATYPMAX3.601.60+0.5+1.5%mARMSmAUNITSVVFrom SHDN high to OUT high, VOUT = 1.5V2_______________________________________________________________________________________
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Low-Input-Voltage, 500mA LDO Regulator
with RESETin SOT and TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN= (VOUT+ 0.5V) or VIN= 1.8V, whichever is greater; SHDN= IN, CC.) (Note 1)
IN= 1µF, COUT= 4.7µF, TA= -40°C to +85°C, unless other-wise noted. Typical values are at TA= +25°PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSRESET Output HighTA = +25°C0.0011Leakage CurrentIOHV RESET = 3.6V,RESET not assertedTA = +85°C0.01µAReset DelaytRPFrom VOUT high to RESET rising70100160msTHERMAL PROTECTIONThermal-Shutdown TemperatureT SHDN+165°CThermal-Shutdown Hysteresis∆T SHDN15°CNote 1:Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design.Note 2:The dropout voltage is defined as VIN- VOUT, when VOUTis 4% lower than the value of VOUTwhen VIN= VOUT+ 0.5V.
Typical Operating Characteristics
(VIN= (VOUT+ 0.5V) or 1.8V, whichever is greater; SHDN= IN, CIN= 1µF, COUT= 4.7µF, TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE ACCURACY
OUTPUT VOLTAGE ACCURACY
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENT
vs. INPUT VOLTAGE
vs. TEMPERATURE
0.210.50
21.5
3000cccoVootOUT = +1.5Vtt 99V988OUT = +1.5V85551)1)1)%X%XXAA%AM(M(1.0M( Y0.1
YYCCCAA0.25
ARRRUUIOUT = 0mAU0.5
CCCCVOUT = +1.5VCCIAAOUT = 0mA, 100mA, 500mAA E0
EEGGGA0
A0ATTTLLLOOOVVVIOUT = 100mAV OUT = +3.0V TTTU-0.5UUP-0.1
P-0.25
PTTTUVUIUOOUT = +0.75VOOUT = 500mAO-1.0-0.2
-0.50
-1.5
0
100
200
300
400
500
1.4
1.8
2.2
2.6
3.0
3.4
-40-1510356085
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
GROUND-PIN CURRENTGROUND-PIN CURRENTGROUND-PIN CURRENTvs. LOAD CURRENT
vs. INPUT VOLTAGE
vs. TEMPERATURE
12041205100
6000cccooott t I999OUT = 100mA88V85V5OUT = +1.5V51110OUT = +3.0V1XXAAI1OUT = 500mAXAM)100M)M)AAA90
µµµ((( TTTNNE100
NIOUT = 1mA TO 500mAE80ERRRRUVROUT = +1.5VR80
UUCC N90
C N60NIIIPP--DV = +0.75VPOUT-DDNN70
NUUUO80O40IOUT = 0mAOIOUT = 0mARRRGGG7020
60
VOUT = +1.5V60
0
50
0.01
0.1
1
10
100
1000
1.2
1.6
2.0
2.4
2.8
3.2
3.6
-40
-15
10
35
60
85
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
_______________________________________________________________________________________3
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Low-Input-Voltage, 500mA LDO Regulatorwith RESETin SOT and TDFN89Typical Operating Characteristics (continued)(VIN= (VOUT+ 0.5V) or 1.8V, whichever is greater; SHDN= IN, CIN= 1µF, COUT= 4.7µF, TA= +25°C, unless otherwise noted.)
51XAM4DROPOUT VOLTAGE POWER-SUPPLY REJECTION RATIO
vs. LOAD CURRENT
vs. FREQUENCY
200
70c80ot 9VOUT = +1.5V851X70160AMVOUT = +0.75V60)VOUT = +3.0VVm)(120
VOUT = +1.8VB50TdU( ORPR40ORSD80
VOUT = +3.0VPV3040
2010
IOUT = 10mA00
0
100
200
300
400
500
0.1
1
10100
1000
LOAD CURRENT (mA)
FREQUENCY (kHz)
LINE-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
MAX1589 toc09NEAR DROPOUT
MAX1589 toc102.5VV4V
IN
500mV/div
VIN
3.5V
500mV/div
1.8V
VOUT
1.5VVOUT
1.5VILOAD = 100mAV10mV/divILOAD = 100mA OUT = 1.5V AC-COUPLED
VOUT = 1.5V 10mV/div AC-COUPLED
40µs/div
40µs/div
LOAD-TRANSIENT RESPONSE
MAX1589 toc11LOAD-TRANSIENT RESPONSE
MAX1589 toc12I200mA500mAOUT200mA/div
I20mA
OUT500mA/div
100mA
VOUT0
20mV/divAC-COUPLED
VOUT
50mV/divAC-COUPLED
Vs/div
IN = 1.8V20µV20µs/div
IN = 3.6VVOUT = 1.5V
VOUT = 1.5V
_______________________________________________________________________________________
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Low-Input-Voltage, 500mA LDO Regulator
with RESETin SOT and TDFN
Typical Operating Characteristics (continued)(VIN= (VOUT+ 0.5V) or 1.8V, whichever is greater; SHDN= IN, CIN= 1µF, COUT= 4.7µF, TA= +25°C, unless otherwise noted.)
SHUTDOWN RESPONSE
SHUTDOWN/RESET RESPONSEMAX1589 toc13MAX1589 toc14RL = 25ΩRL = 25ΩVOUT = 1.5VVOUT = 1.5VVSHDN
1V/div
VSHDN1V/div
0
0
VOUT
V0
1V/div
OUT
500mV/div
VRESET
0
0
1V/div
100µs/div
40ms/div
LINE/RESET RESPONSE
MAX1589 toc15RL = 25ΩVOUT = 1.5VVIN
2V/div
0VOUT
1V/div0
VRESET
1V/div0
200ms/div
_______________________________________________________________________________________5
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Low-Input-Voltage, 500mA LDO Regulatorwith RESETin SOT and TDFNMAX1589Pin DescriptionPARTSOT231TDFN6INRegulator Input. Supply voltage can range from +1.62V to +3.6V. Bypass IN with at least a1µF ceramic capacitor to GND (see the Capacitor Selection and Regulator Stabilitysection).Ground. GND also functions as a heatsink. Solder GND to a large pad or circuit-boardground plane to maximize SOT23 power dissipation.GroundActive-Low Shutdown Input. A logic low reduces supply current to below 1µA. Connect toIN or logic high for normal operation.Active-Low, Open-Drain Reset Output. RESET rises 100ms after the output has achievedregulation. RESET falls immediately if VOUT drops below 82.5% of its nominal voltage, or ifthe MAX1589 is shut down.Internally Connected. Leave floating or connect to GND.Regulator Output. Sources up to 500mA. Bypass with a 4.7µF low-ESR ceramic capacitorto GND.Ground. EP also functions as a heatsink. Solder EP to a large pad or circuit-board groundplane to maximize TDFN power dissipation.NAMEFUNCTION2—3—45GNDGNDSHDN456—321ExposedPadRESETI.C.OUTEPDetailed DescriptionThe MAX1589 is a low-dropout, low-quiescent-current,high-accuracy linear regulator designed primarily forbattery-powered applications. The device suppliesloads up to 500mA and is available with preset outputvoltages from +0.75V to +3.0V. As illustrated in Figure 1,the MAX1589 contains a reference, an error amplifier, aP-channel pass transistor, an internal feedback voltage-divider, and a power-good comparator.
The error amplifier compares the reference with thefeedback voltage and amplifies the difference. If thefeedback voltage is lower than the reference voltage,the pass-transistor gate is pulled lower, allowing morecurrent to pass to the output and increasing the outputvoltage. If the feedback voltage is too high, the pass-transistor gate is pulled up, allowing less current topass to the output.
MAX1589 does not suffer from these problems andconsumes only 90µA (typ) of quiescent current underheavy loads, as well as in dropout.
Shutdown
Pull SHDNlow to enter shutdown. During shutdown, theoutput is disconnected from the input, an internal 1.5kΩresistor pulls OUT to GND, RESETis actively pulledlow, and supply current drops below 1µA.
RESETOutput
The MAX1589’s microprocessor (µP) supervisory cir-cuitry asserts a guaranteed logic-low reset duringpower-up, power-down, and brownout conditions downto +1V. RESETasserts when VOUTis below the resetthreshold and remains asserted for at least 70ms (tRP)after VOUTrises above the reset threshold.
Current Limit
The MAX1589 monitors and controls the pass transis-tor’s gate voltage, limiting the output current to 850mA(typ). If the output current exceeds ILIM, the MAX1589output voltage drops.
Internal P-Channel Pass Transistor
The MAX1589 features a 0.33Ω(RDS(ON)) P-channelMOSFET pass transistor. Unlike similar designs usingPNP pass transistors, P-channel MOSFETs require nobase drive, which reduces quiescent current. PNP-based regulators also waste considerable current indropout when the pass transistor saturates and usehigh base-drive currents under large loads. The
6
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-tion in the MAX1589. When the junction temperatureexceeds +165°C, a thermal sensor turns off the pass
_______________________________________________________________________________________
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Low-Input-Voltage, 500mA LDO Regulator
with RESETin SOT and TDFN
INSHDNSHUTDOWNERRORMOS DRIVERPLOGICAMPWITH ILIMITOUTMAX1589POWER-GOODCOMPARATORRESETTHERMAL82.5%SENSORREFREF100msTIMERGNDFigure 1. Functional Diagramtransistor, allowing the IC to cool. The thermal sensor41°C/W for the 3mm x 3mm TDFN package, andturns the pass transistor on again after the junction tem-110°C/W for the 6-pin thin SOT23 package. For bestperature cools by 15°C, resulting in a pulsed outputheatsinking, expand the copper connected to GND, orduring continuous thermal-overload conditions.the exposed paddle.
Thermal-overload protection safeguards the MAX1589in the event of fault conditions. For continuous opera-The MAX1589 delivers up to 500mA and operates withtion, do not exceed the absolute maximum junction-an input voltage up to +3.6V. However, when using thetemperature rating of +150°C.
6-pin SOT23 version, high output currents can only besustained when the input-output differential voltage isOperating Region and Power Dissipation
low, as shown in Figure 2.
The MAX1589’s maximum power dissipation dependson the thermal resistance of the IC package and circuitThe maximum allowed power dissipation for the 6-pinboard, the temperature difference between the dieTDFN is 1.951W at TA= +70°C. Figure 3 shows that thejunction and ambient air, and the rate of airflow. Themaximum input-output differential voltage is not limitedpower dissipated in the device is P = Iby the TDFN package power rating.
OUT✕(VIN -VOUT). The maximum allowed power dissipation is:
Applications Information
PMAX= (TJ(MAX)- TA) / (θJC+ θCA)
Capacitor Selection and
Regulator Stability
where TJ(MAX)- TAis the temperature difference betweenCapacitors are required at the MAX1589’s input andthe MAX1589 die junction and the surrounding air, θoutput for stable operation over the full temperaturethe thermal resistance of the junction to the case, andJCisrange and with load currents up to 500mA. Connect aθ1µF ceramic capacitor between IN and GND and aPC board, copper traces, and other materials to the sur-CAis the thermal resistance from the case through the4.7µF low-ESR ceramic capacitor between OUT androunding air. Typical thermal resistance (θJC+ θJA) for aGND. The input capacitor (Cdevice mounted to a 1in square, 1oz copper pad is
impedance of the input supply. Use larger output
IN) lowers the source_______________________________________________________________________________________
7
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Low-Input-Voltage, 500mA LDO Regulatorwith RESETin SOT and TDFNMAX1589MAXIMUM OUTPUT CURRENTvs. INPUT VOLTAGE(POWER DISSIPATION LIMIT)MAX1589 fig02MAXIMUM OUTPUT CURRENTvs. INPUT VOLTAGE(POWER DISSIPATION LIMIT)TA = +85°CMAX1589 fig03600MAXIMUM OUTPUT CURRENT (mA)50040030020010000MAXIMUM OUTPUT CURRENT (mA)TA = +85°CTA = +70°C6005004003002001000MAXIMUM RECOMMENDEDOUTPUT CURRENT 6-PIN SOT230.51.01.52.02.53.0MAXIMUM RECOMMENDEDOUTPUT CURRENT 6-PIN TDFN00.51.01.52.02.53.0(VIN - VOUT) (V)(VIN - VOUT) (V)Figure 2. Power Operating Regions for 6-Pin SOT23: MaximumOutput Current vs. Input VoltageFigure 3. Power Operating Region for 6-Pin TDFN: MaximumOutput Current vs. Input Voltage
capacitors to reduce noise and improve load-transientresponse, stability, and power-supply rejection.The output capacitor’s equivalent series resistance(ESR) affects stability and output noise. Use outputcapacitors with an ESR of 30mΩor less to ensure sta-bility and optimize transient response. Surface-mountceramic capacitors have very low ESR and are com-monly available in values up to 10µF. Connect CINandCOUTas close to the MAX1589 as possible to minimizethe impact of PC board trace inductance.
the output response: a near-zero DC shift from the out-put impedance due to the load-current change, and thetransient response. A typical transient response for astep change in the load current from 100mA to 500mAis 35mV. Increasing the output capacitor’s value anddecreasing the ESR attenuates the overshoot.
Input-Output (Dropout) Voltage
A regulator’s minimum input-output voltage difference(dropout voltage) determines the lowest usable supplyvoltage. In battery-powered systems, this determinesthe useful end-of-life battery voltage. Because theMAX1589 uses a P-channel MOSFET pass transistor, itsdropout voltage is a function of drain-to-source on-resis-tance (RDS(ON)= 0.33Ω) multiplied by the load current(see the Typical Operating Characteristics):
VDROPOUT= VIN- VOUT = 0.33Ω✕IOUT
The MAX1589 ground current reduces to 70µA in dropout.
Noise, PSRR, and Transient Response
The MAX1589 is designed to operate with low dropoutvoltages and low quiescent currents in battery-poweredsystems, while still maintaining good noise, transientresponse, and AC rejection. See the Typical OperatingCharacteristicsfor a plot of Power-Supply RejectionRatio (PSRR) vs. Frequency. When operating from noisysources, improved supply-noise rejection and transientresponse can be achieved by increasing the values ofthe input and output bypass capacitors and throughpassive filtering techniques.
The MAX1589 load-transient response (see theTypicalOperating Characteristics) shows two components of
Chip Information
TRANSISTOR COUNT: 2556PROCESS: BiCMOS
8_______________________________________________________________________________________
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Low-Input-Voltage, 500mA LDO Regulator
with RESETin SOT and TDFN
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to www.maxim-ic.com/packages.)
_______________________________________________________________________________________9
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Low-Input-Voltage, 500mA LDO Regulatorwith RESETin SOT and TDFNMAX1589Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to www.maxim-ic.com/packages.)
10______________________________________________________________________________________
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Low-Input-Voltage, 500mA LDO Regulator
with RESETin SOT and TDFN
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to www.maxim-ic.com/packages.)
SPEL.NIDAD2HA2T NPIN 1 IDFD1N1 ,L0bC0.351& ,8 PIN 1EE2[(N/2)-1] x e,6INDEX REF.AREADETAIL AeA1kCLCLLLeeASEMICONDUCTORDALLASPROPRIETARY INFORMATIONTITLE:PACKAGE OUTLINE, 6, 8 & 10L, TDFN, EXPOSED PAD, 3x3x0.80 mmNUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLYAPPROVALDOCUMENT CONTROL NO.REV.21-0137D12______________________________________________________________________________________11
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Low-Input-Voltage, 500mA LDO Regulatorwith RESETin SOT and TDFNMAX1589Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to www.maxim-ic.com/packages.)
COMMON DIMENSIONSSYMBOLADEA1LkA2MIN.0.702.902.900.000.20MAX.0.803.103.100.050.400.25 MIN.0.20 REF.PACKAGE VARIATIONSPKG. CODET633-1T833-1T1033-1N6810D21.50–0.101.50–0.101.50–0.10E22.30–0.102.30–0.102.30–0.10e0.95 BSC0.65 BSC0.50 BSCJEDEC SPECMO229 / WEEAMO229 / WEECMO229 / WEED-3b0.40–0.050.30–0.050.25–0.05[(N/2)-1] x e1.90 REF1.95 REF2.00 REFSEMICONDUCTORPROPRIETARY INFORMATIONTITLE:DALLASPACKAGE OUTLINE, 6, 8 & 10L, TDFN, EXPOSED PAD, 3x3x0.80 mmAPPROVALDOCUMENT CONTROL NO.REV.21-0137D22Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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