MAX1968EUI ,Power Drivers for Peltier TEC ModulesFeaturesThe MAX1968/MAX1969 are highly integrated and cost- Direct Current Control Prevents TEC Cu ..
MAX1968EVKIT ,Evaluation Kit for the MAX1968FeaturesThe MAX1968 evaluation kit (EV kit) is a fully assembled ±3A Output Currentand tested PC b ..
MAX196ACAI ,Multirange, Single %V, 12-Bit DAS with 12-Bit Bus InterfaceApplicationsMAX196D8 6 23 REFMAX198Industrial-Control SystemsD7 7 22 REFADJRoboticsD6 8 21 CH5Data- ..
MAX196ACAI+ ,6-Channel, Multirange, 5V, 12-Bit DAS with 12-Bit Bus Interface and Fault ProtectionFeatures♦ 12-Bit Resolution, 1/2LSB LinearityThe MAX196/MAX198 multirange, 12-bit data-acquisi-tion ..
MAX196ACAI+ ,6-Channel, Multirange, 5V, 12-Bit DAS with 12-Bit Bus Interface and Fault ProtectionFeatures♦ 12-Bit Resolution, 1/2LSB LinearityThe MAX196/MAX198 multirange, 12-bit data-acquisi-tion ..
MAX196ACNI+ ,6-Channel, Multirange, 5V, 12-Bit DAS with 12-Bit Bus Interface and Fault ProtectionFeatures♦ 12-Bit Resolution, 1/2LSB LinearityThe MAX196/MAX198 multirange, 12-bit data-acquisi-tion ..
MAX491MJD ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversApplications ______________Ordering InformationLow-Power RS-485 TransceiversPART TEMP. RANGE PIN-PA ..
MAX4927ETN+ ,1000 Base-T, ±15kV ESD Protection LAN SwitchApplicationsSTMUX1000LNotebooks and Docking Stations ♦ Space-Saving Lead-Free PackageServers and Ro ..
MAX4928BETN+ ,DisplayPort/PCIe Passive SwitchesELECTRICAL CHARACTERISTICS(V = +3.3V ±10%, T =T to T , unless otherwise noted. Typical values are a ..
MAX4928BETN+T ,DisplayPort/PCIe Passive SwitchesApplicationsMAX4928BETN+ -40°C to +85°F 56 TQFN-EPDesktop PCs+Denotes a lead-free package/RoHS-Comp ..
MAX492CPA ,Single/Dual/Quad, Micropower, Single-Supply Rail-to-Rail Op AmpsELECTRICAL CHARACTERISTICS(V = 2.7V to 6V, V = GND, T = +25°C, unless otherwise noted.)CC EE APARAM ..
MAX492CPA ,Single/Dual/Quad, Micropower, Single-Supply Rail-to-Rail Op AmpsFeatures' Low-Voltage Single-Supply Operation (+2.7V to +6V)The dual MAX492, quad MAX494, and singl ..
MAX1968EUI
Power Drivers for Peltier TEC Modules
General DescriptionThe MAX1968/MAX1969 are highly integrated and cost-
effective, high-efficiency, switch-mode drivers for Peltier
thermoelectric cooler (TEC) modules. Both devices uti-
lize direct current control to eliminate current surges in
the TEC. On-chip FETs minimize external components
while providing high efficiency. A 500kHz/1MHz switch-
ing frequency and a unique ripple cancellation scheme
reduce component size and noise.
The MAX1968 operates from a single supply and pro-
vides bipolar ±3A output by biasing the TEC between
the outputs of two synchronous buck regulators. Bipolar
operation allows for temperature control without “dead
zones” or other nonlinearities at low load currents. This
arrangement ensures that the control system does not
hunt when the set point is very close to the natural
operating point, requiring a small amount of heating or
cooling. An analog control signal precisely sets the TEC
current. The MAX1969 provides unipolar output up to
6A. Reliability is optimized with settable limits for both
TEC voltage and current, with independently set limits
for heating and cooling current. An analog output also
monitors TEC current.
The MAX1968/MAX1969 are available in a low-profile
28-pin TSSOP-EP package and is specified over the
-40°C to +85°C temperature range. The thermally-
enhanced TSSOP-EP package with exposed metal pad
minimizes operating junction temperature. An evalua-
tion kit is available to speed designs.
ApplicationsFiber Optic Laser Modules
WDM, DWDM Laser Diode Temperature Control
Fiber Optic Network Equipment
EDFAOptical Amplifiers
Telecom Fiber Interfaces
ATE
Biotech Lab Equipment
FeaturesDirect Current Control Prevents TEC Current
SurgesOn-Chip Power MOSFETsHigh-Efficiency Switch-Mode DesignRipple Cancellation for Low NoiseNo Dead-Zone or Hunting at Low-Output CurrentAdjustable TEC Voltage LimitSeparately Adjustable Heating and Cooling
Current LimitsITEC Output Monitors TEC Current1% Accurate Voltage Reference500kHz/1MHz Switching Frequency±3A Output Current (MAX1968)
6A Output Current (MAX1969)Thermally Enhanced TSSOP-EP Package
MAX1968/MAX1969
Ordering Information19-2447; Rev 0; 4/02
Typical Operating Circuit
Pin Configuration and Functional Diagram appear at end
of datasheet.*EP = exposed paddle
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD = PVDD1 = PVDD2 = SHDN= 5V, PGND1 = PGND2 = FREQ = GND, CTLI = MAXV = MAXIP = MAXIN = REF, CREF = 1µF,
CCOMP = 0.1µF, LLX_= 3.3µH, CCS= COS2= 1µF, ITEC < 3ARMS(MAX1968), ITEC< 6ARMS(MAX1969), TA = 0°C to +85°C, unless
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDDto GND..............................................................-0.3V to +6V
SHDN, MAXV, MAXIP, MAXIN, CTLI,
FREQ to GND.......................................................-0.3V to +6V
COMP, OS1, OS2, CS, REF,
ITEC to GND...........................................-0.3V to (VDD + 0.3V)
PVDD1, PVDD2 to GND...............................-0.3V to (VDD + 0.3V)
PVDD1, PVDD2 to VDD..................................................-0.3V to +0.3V
PGND1, PGND2 to GND.......................................-0.3V to +0.3V
COMP, REF, ITEC Short to GND...................................Indefinite
Peak LX Current (MAX1968) (Note 1).................................±4.5A
Peak LX Current (MAX1969) (Note 1)....................................+9A
Continuous Power Dissipation (TA= +70°C)
28-Pin TSSOP-EP (derate 23.8mW/°C above +70°C).....1.9W
Operating Temperature Range...........................-40°C to +85°C
Maximum Junction Temperature.....................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering 10s)..................................+300°C
Note 1:LX has internal clamp diodes to PGND and PVDD_. Applications that forward bias these diodes should take care not to
exceed the IC’s package power dissipation limits.
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
ELECTRICAL CHARACTERISTICS (continued)(VDD = PVDD1 = PVDD2 = SHDN= 5V, PGND1 = PGND2 = FREQ = GND, CTLI = MAXV = MAXIP = MAXIN = REF, CREF = 1µF,
CCOMP = 0.01µF, LLX_= 3.3µH, CCS= COS2= 1µF, ITEC < 3ARMS(MAX1968), ITEC< 6ARMS(MAX1969), TA = 0°C to +85°C, unless
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
ELECTRICAL CHARACTERISTICS(VDD = PVDD1 = PVDD2 = SHDN= 5V, PGND1 = PGND2 = FREQ = GND, CTLI = MAXV = MAXIP = MAXIN = REF, CREF = 1µF,
CCOMP = 0.1µF, LLX_= 3.3µH, CCS= COS2= 1µF, ITEC < 3ARMS(MAX1968), ITEC< 6ARMS(MAX1969), TA = -40°C to +85°C, unless
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
ELECTRICAL CHARACTERISTICS (continued)(VDD = PVDD1 = PVDD2 = SHDN= 5V, PGND1 = PGND2 = FREQ = GND, CTLI = MAXV = MAXIP = MAXIN = REF, CREF = 1µF,
CCOMP = 0.01µF, LLX_= 3.3µH, CCS= COS2= 1µF, ITEC < 3ARMS(MAX1968), ITEC< 6ARMS(MAX1969), TA = -40°C to +85°C,
Note 3:CTLI Gain is defined as:
Note 4:Specifications to -40°C are guaranteed by design, not production tested.
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
Typical Operating Characteristics(VDD = 5V, VCTLI = 1V, VFREQ = GND, RLOAD= 1Ω,circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
Typical Operating Characteristics (continued)(VDD = 5V, VCTLI = 1V, VFREQ = GND, RLOAD= 1Ω,circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
Typical Operating Characteristics (continued)(VDD = 5V, VCTLI = 1V, VFREQ = GND, RLOAD= 1Ω,circuit of Figure 1, TA = +25°C, unless otherwise noted.)
