AVAILABLE Integrated Temperature Controllers for Peltier ...

1 AVAILABLEF unctional DiagramsPin Configurations appear at end of data Diagrams continued at end of data is a trademark of Maxim Integrated Products, pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim s website at DescriptionThe MAX1978/MAX1979 are the smallest, safest, mostaccurate complete single-chip Temperature Controllers forPeltier thermoelectric cooler (TEC) modules. On-chip powerFETs and thermal control-loop circuitry minimize externalcomponents while maintaining high efficiency. Selectable500kHz/1 MHz switching frequency and a unique ripple-can-cellation scheme optimize component size and efficiencywhile reducing noise.

2 Switching speeds of internalMOSFETs are optimized to reduce noise and EMI. An ultra-low-drift chopper amplifier maintains C temperaturestability. Output current, rather than voltage, is directly con-trolled to eliminate current surges. Individual heating andcooling current and voltage limits provide the highest level ofTEC MAX1978 operates from a single supply and providesbipolar 3A output by biasing the TEC between the outputsof two synchronous buck regulators. True bipolar operationcontrols Temperature without dead zones or other nonlin-earities at low load currents. The control system does nothunt when the set point is very close to the natural operatingpoint, where only a small amount of heating or cooling isneeded.

3 An analog control signal precisely sets the TECcurrent. The MAX1979 provides unipolar output up to chopper-stabilized instrumentation amplifier and a high-precision integrator amplifier are supplied to create a pro-portional-integral (PI) or proportional-integral-derivative (PID)controller. The instrumentation amplifier can interface to anexternal NTC or PTC thermistor, thermocouple, or semicon-ductor Temperature sensor. Analog outputs are provided tomonitor TEC Temperature and current. In addition, separateovertemperature and undertemperature outputs indicatewhen the TEC Temperature is out of range. An on-chip volt-age reference provides bias for a thermistor bridge.

4 The MAX1978/MAX1979 are AVAILABLE in a low-profile48-lead thin QFN-EP package and is specified over the-40 C to +85 C Temperature range. The thermallyenhanced QFN-EP package with exposed metal padminimizes operating junction Temperature . An evaluationkit is AVAILABLE to speed Optic Laser ModulesWDM, DWDM Laser-Diode Temperature ControlFiber Optic Network EquipmentEDFA Optical AmplifiersTelecom Fiber InterfacesATEF eatures Smallest, Safest, Most Accurate CompleteSingle-Chip Controller On-Chip Power MOSFETS No External FETs Circuit Footprint < Circuit Height < 3mm Temperature Stability to C Integrated Precision Integrator and ChopperStabilized Op Amps Accurate, Independent Heating and CoolingCurrent Limits Eliminates Surges By Directly Controlling TEC Current Adjustable Differential TEC Voltage Limit Low-Ripple and Low-Noise Design TEC Current Monitor Temperature Monitor Over- and Undertemperature Alarm Bipolar 3A Output Current (MAX1978) Unipolar +6A Output Current (MAX1979) Integrated TemperatureControllers for Peltier ModulesOrdering +BFB+AOUTAIN-AIN+GNDINT-INTOUTCSREFCTLIV DDGNDGNDMAXVMAXINMAXIPITECCOMPOS1 TQFN-EPMAX1978 MAX1979 BFB-TOP VIEW*ELECTRICALLY CONNECTED TO THE UNDERSIDE METAL.

5 GND IS CONNECTED TO THE UNDERSIDE METAL +Pin ConfigurationTypical Operating Circuit appears at end of data EM P R A N G EPIN-PACKAGEMAX1978 ETM+- 40 C to + 85 C 48 Thin QFN-EP*MAX1979 ETM+- 40 C to + 85 C 48 Thin QFN-EP**EP = Exposed pad.+Denotes a lead(Pb)-free/RoHS-compliant Configuration19-2490; Rev 3; 3/10 Typical Operating Circuit appears at end of data TemperatureControllers for Peltier ModulesABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(VDD= PVDD1 = PVDD2 = VSHDN= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA= 0 C to +85 C,unless otherwise noted. Typical values at TA= +25 C.) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

6 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 GND .. to +6 VSHDN, MAXV, MAXIP, MAXIN, CTLI, OT, UTto to +6 VFREQ, COMP, OS1, OS2, CS, REF, ITEC, AIN+, AIN-, AOUT, INT-, INTOUT, BFB+, BFB-, FB+, FB-,DIFOUT to to (VDD+ )PVDD1, PVDD2 to to + , PVDD2 to GND .. to (VDD+ )PGND1, PGND2 to GND .. to + , REF, ITEC, OT, UT, INTOUT, DIFOUT, BFB-, BFB+, AOUT Short to GND ..IndefinitePeak LX Current (MAX1978) (Note 1).. LX Current (MAX1979) (Note 1)..+9 AContinuous Power Dissipation (TA= +70 C) 48-Lead Thin QFN-EP (derate C above +70 C) (Note 2).

7 Temperature RangesMAX1978 ETM ..-40 C to +85 CMAX1979 ETM ..-40 C to +85 CMaximum Junction Temperature ..+150 CStorage Temperature Range ..-65 C to +150 CLead Temperature (soldering, 10s) ..+300 CPARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS I nput Supply = 5V, ITEC = 0 to 3A,VOUT = VOS1 - VOS2 (MAX1978) + = 5V, ITEC = 0 to 6A,VOUT = VOS1 (MAX1979) = 3V, ITEC = 0 to 3A,VOUT = VOS1 - VOS2 (MAX1978) + Voltage RangeVOUTVDD = 3V, ITEC = 0 to 6A,VOUT = VOS1 (MAX1979) 3 Maximum TEC CurrentITEC(MAX)MAX19796 AReference VoltageVREFVDD = 3V to , IREF = 150 Load Regulation VREFVDD = 3V to , IREF = +10 A to = VREF135150160 VOS1 < VCSVMAXI_ = VREF/3405060 VMAXI_ = VREF135150160 Current-Sense ThresholdVOS1 > VCSVMAXI_ = VREF/3405060mVVDD = 5V, I = On-ResistanceRDS(ON-N)VDD = 3V, I = VDD = 5V, I = On-ResistanceRDS(ON-P)VDD = 3V, I = VLX = VDD = 5V, TA = +25 LeakageILEAK(N)

8 VLX = VDD = 5V, TA = +85 C1 ANote 1:LX has internal clamp diodes to PGND and PVDD. Applications that forward bias these diodes should not exceed the IC spackage power dissipation 2:Solder underside metal slug to PCB ground IntegratedIntegrated TemperatureControllers for Peltier ModulesELECTRICAL CHARACTERISTICS (continued)(VDD= PVDD1 = PVDD2 = VSHDN= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA= 0 C to +85 C,unless otherwise noted. Typical values at TA= +25 C.) PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSV LX = 0, TA = +25 LeakageILEAK(P)VLX = 0, TA = +85 C1 AVDD = 5V3050No-Load Supply CurrentIDD(NOLOAD)VDD = Supply CurrentIDD-SDSHDN = GND, VDD = 5V (Note 3)23mAThermal ShutdownTS H U TD OWN Hysteresis = 15 C165 CVDD ThresholdVUVLOVDD = GND450500650 Switching Frequency InternalOscillatorfSW-INTFREQ=VDD8001000 1200kHzOS1, OS2, CS Input CurrentIOS1, IOS2,ICS0 or VDD-100+100 ASHDN, FREQ Input CurrentISHDN,IFREQ0 or VDD-5+5 ASHDN, FREQ Input Low VoltageVILVDD = 3V to VDDVSHDN, FREQ Input High VoltageVIHVDD = 3V to VDDVVMAXV = VREF ,VOS1 to VOS2 = 4V, VDD = 5V-1+1 MAXV Threshold AccuracyVMAXV = VREF ,VOS1 to VOS2 = 2V, VDD = 3V-2+2%MAXV, MAXIP, MAXINI nput Bias CurrentIMAXV-BIAS,IMAXI_-BIASVMAXV = VMAXI_ = or + ACTLI GainACTLIVCTLI = to (Note 4)

9 Input ResistanceRCTLI1M terminated at Error Amp Transconductancegm50100175 SITEC AccuracyVOS1 to VCS = +100mV or -100mV-10+10%ITEC Load Regulation VITECVOS1 to VCS = +100mV or -100mV,IITEC = 10 + Amp Input BiasCurrentIDIF-BIAS-100+10nAInstrumenta tion Amp OffsetVoltageVDIF-OSVDD = 3V to +20+200 VInstrumentation Amp Offset-Voltage Drift with TemperatureVDD = 3V to V/ CInstrumentation Amp PresetGainADIFRLOAD = 10k to REF455055V/VMAX1978/MAX1979 Maxim Integrated3 Integrated TemperatureControllers for Peltier ModulesELECTRICAL CHARACTERISTICS (continued)(VDD= PVDD1 = PVDD2 = VSHDN= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA= 0 C to +85 C,unless otherwise noted. Typical values at TA= +25 C.)

10 PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSI ntegrator Amp Open-Loop GainAOL-INTRLOAD = 10k to REF120dBIntegrator Amp CMRRCMRRINT100dBIntegrator Amp Input Bias CurrentIINT-BIASVDD = 3V to Amp Voltage OffsetVINT-OSVDD = 3V to + +3mVIntegrator Amp Gain BandwidthGBWINT100kHzUndedicated Chopper AmpOpen-Loop GainAOL-AINRLOAD = 10k to REF120dBUndedicated Chopper AmpCMRRCMRRAIN85dBUndedicated Chopper Amp InputBias CurrentIAIN-BIASVDD = 3V to +10nAUndedicated Chopper AmpOffset VoltageVAIN-OSVDD = 3V to +10+200 VUndedicated Chopper Amp GainBandwidthGBWAIN100kHzUndedicated Chopper AmpOutput RippleVRIPPLEA = 520mV BFB_ Buffer ErrorC L OA D < 100p F-2000+200 VUT and OT Leakage CurrentILEAKV UT = V OT = 1 AUT and OT Output Low VoltageVOLS inking 4mA50150mVUT Trip ThresholdFB+ - FB- (see Typical Application Circuit)-20mVOT Trip ThresholdFB+ - FB- (see Typical Application Circuit)20 mVMAX1978/MAX19794 Maxim IntegratedIntegrated TemperatureControllers for Peltier ModulesELECTRICAL CHARACTERISTICS(VDD= PVDD1 = PVDD2 = VSHDN= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA= -40 C to +85 C,unless otherwise noted.)