MAX1978ETM ,Integrated Temperature Controllers for Peltier ModulesELECTRICAL CHARACTERISTICS(V = PV 1 = PV 2 = SHDN = 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP ..
MAX1978ETM ,Integrated Temperature Controllers for Peltier ModulesApplications 30PV 2 7 PV 1DD MAX1979 DDN.C. 8 29 N.C.Fiber Optic Laser ModulesLX2 9 28 LX127PV 2 10 ..
MAX1978ETM+ ,Integrated Temperature Controllers for Peltier ModulesApplicationsPV 2 7 30 PV 1DD MAX1979 DDN.C. 8 29 N.C.Fiber Optic Laser Modules28LX2 9 LX1PV 2 10 27 ..
MAX1979ETM+ ,Integrated Temperature Controllers for Peltier ModulesFeatures♦ Smallest, Safest, Most Accurate CompleteThe MAX1978/MAX1979 are the smallest, safest, mos ..
MAX197ACAI ,Multi-Range (【10V, 【5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interfacefeatures include a 5MHz bandwidth track/hold, a100ksps throughput rate, software-selectable interna ..
MAX197ACAI+ ,Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus InterfaceFeatures♦ 12-Bit Resolution, 1/2LSB LinearityThe MAX197 multi-range, 12-bit data-acquisition sys-te ..
MAX497CPE ,375MHz Quad Closed-Loop Video Buffers, AV = +1 and +2FeaturesThe MAX496 and MAX497 are quad, closed-loop, ±5V ' MAX496 Fixed Gain: +1V/VMAX497 Fixed Ga ..
MAX497CPE+ ,375MHz Quad Closed Loop Video Buffers, AV = +1 and +2ELECTRICAL CHARACTERISTICS(V = +5V, V = -5V, V = 0V, R = 150Ω, T = T to T , unless otherwise noted. ..
MAX497CSE ,375MHz Quad Closed-Loop Video Buffers, AV = +1 and +2MAX496/MAX49719-0373; Rev 1; 12/98375MHz Quad Closed-Loop Video Buffers, A = +1 and +2V____________ ..
MAX497CSE+ ,375MHz Quad Closed Loop Video Buffers, AV = +1 and +2Applications♦ Low Distortion: 64dBc (f = 10MHz)Computer Workstations♦ Directly Drives 50Ω or 75Ω B ..
MAX4981ETA+T ,Overvoltage Protector with Active Current LimitApplications*EPCell Phones PDAs and PalmtopDevicesMP3 Players13 2 4Digital Still CamerasSDT(BAT)IN ..
MAX4983EEVB+ ,High-Speed USB 2.0 Switches with ±15kV ESDfeatures an active-high enableActive-High (EN) MAX4984Einput (EN) that when driven low sets the dev ..
MAX1978ETM
Integrated Temperature Controllers for Peltier Modules
General DescriptionThe MAX1978/MAX1979 are the smallest, safest, most
accurate complete single-chip temperature controllers for
Peltier thermoelectric cooler (TEC) modules. On-chip power
FETs and thermal control-loop circuitry minimize external
components while maintaining high efficiency. Selectable
500kHz/1MHz switching frequency and a unique ripple-can-
cellation scheme optimize component size and efficiency
while reducing noise. Switching speeds of internal
MOSFETs are optimized to reduce noise and EMI. An ultra-
low-drift chopper amplifier maintains ±0.001°C temperature
stability. Output current, rather than voltage, is directly con-
trolled to eliminate current surges. Individual heating and
cooling current and voltage limits provide the highest level of
TEC protection.
The MAX1978 operates from a single supply and provides
bipolar ±3A output by biasing the TEC between the outputs
of two synchronous buck regulators. True bipolar operation
controls temperature without “dead zones” or other nonlin-
earities at low load currents. The control system does not
hunt when the set point is very close to the natural operating
point, where only a small amount of heating or cooling is
needed. An analog control signal precisely sets the TEC
current. The MAX1979 provides unipolar output up to 6A.
A 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 an
external NTC or PTC thermistor, thermocouple, or semicon-
ductor temperature sensor. Analog outputs are provided to
monitor TEC temperature and current. In addition, separate
overtemperature and undertemperature outputs indicate
when the TEC temperature is out of range. An on-chip volt-
age reference provides bias for a thermistor bridge.
The MAX1978/MAX1979 are available in a low-profile
48-lead thin QFN-EP package and is specified over the
-40°C to +85°C temperature range. The thermally
enhanced QFN-EP package with exposed metal pad
minimizes operating junction temperature. An evaluation
kit is available to speed designs.
ApplicationsFiber Optic Laser Modules
WDM, DWDM Laser-Diode Temperature Control
Fiber Optic Network Equipment
EDFA Optical Amplifiers
Telecom Fiber Interfaces
ATE
FeaturesSmallest, Safest, Most Accurate Complete
Single-Chip ControllerOn-Chip Power MOSFETS—No External FETsCircuit Footprint < 0.93in2Circuit Height < 3mmTemperature Stability to 0.001°CIntegrated Precision Integrator and Chopper
Stabilized Op AmpsAccurate, Independent Heating and Cooling
Current LimitsEliminates Surges By Directly Controlling
TEC CurrentAdjustable Differential TEC Voltage LimitLow-Ripple and Low-Noise DesignTEC Current MonitorTemperature MonitorOver- and Undertemperature AlarmBipolar ±3A Output Current (MAX1978)Unipolar +6A Output Current (MAX1979)
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
Ordering Information
Pin Configuration
Typical Operating Circuit appears at end of data sheet.*EP = Exposed pad.
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= PVDD1 = PVDD2 = SHDN= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA
= 0°C to +85°C,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, OT, UTto GND............................................-0.3V to +6V
FREQ, COMP, OS1, OS2, CS, REF, ITEC, AIN+, AIN-,
AOUT, INT-, INTOUT, BFB+, BFB-, FB+, FB-,
DIFOUT to GND......................................-0.3V to (VDD+ 0.3V)
PVDD1, PVDD2 to VDD...........................................-0.3V to +0.3V
PVDD1, PVDD2 to GND...............................-0.3V to (VDD+ 0.3V)
PGND1, PGND2 to GND.......................................-0.3V to +0.3V
COMP, REF, ITEC, OT, UT, INTOUT, DIFOUT,
BFB-, BFB+, AOUT Short to GND.............................Indefinite
Peak LX Current (MAX1978) (Note 1).................................±4.5A
Peak LX Current (MAX1979) (Note 1)....................................+9A
Continuous Power Dissipation (TA= +70°C)
48-Lead Thin QFN-EP
(derate 26.3mW/°C above +70°C) (Note 2).................2.105W
Operating Temperature Ranges
MAX1978ETM..................................................-40°C to +85°C
MAX1979ETM..................................................-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 not exceed the IC’s
package power dissipation limits.
Note 2:Solder underside metal slug to PC board ground plane.
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
ELECTRICAL CHARACTERISTICS (continued)(VDD= PVDD1 = PVDD2 = SHDN= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA
= 0°C to +85°C,
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD1 = PVDD2 = SHDN= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA
= 0°C to +85°C,
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
ELECTRICAL CHARACTERISTICS
(VDD= PVDD1 = PVDD2 = SHDN= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA= -40°C to +85°C,
unless otherwise noted.) (Note 5)
Note 3:Includes power FET leakage.
Note 4:CTLI gain is defined as:
Note 5:Specifications to -40°C are guaranteed by design, not production tested.
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD1 = PVDD2 = SHDN= 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA
= -40°C to +85°C,
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
EFFICIENCY vs. TEC CURRENT
VDD = 5V
MAX1978 toc01
TEC CURRENT (A)
EFFICIENCY (%)
EFFICIENCY vs. TEC CURRENT
VDD = 3.3VMAX1978 toc02
TEC CURRENT (A)
EFFICIENCY (%)
OUTPUT-VOLTAGE
RIPPLE WAVEFORMSMAX1978 toc03
400ns/div
VOS2
100mV/div
AC-COUPLED
VOS1
100mV/div
AC-COUPLED
VOS1 - VOS1
50mV/div
INPUT SUPPLY RIPPLEMAX1978 toc04
200ns/div
VDD
20mV/div
AC-COUPLED
TEC CURRENT vs. CTLI VOLTAGEMAX1978 toc05
20ms/div
VCTLI
1V/div
ITEC
2A/div
ZERO-CROSSING TEC CURRENTMAX1978 toc06
1ms/div
VCTLI
200mV/div
ITEC
500mA/div
1.5V
VITEC vs. TEC CURRENTMAX1978 toc07
TEC CURRENT (A)
ITEC
(V)10-1-2
TEC CURRENT vs. TEMPERATURE
MAX1978 toc08
TEMPERATURE (°C)
ITEC
(A)6040200-20
SWITCHING FREQUENCY
vs. TEMPERATURE
SWITCHING FREQUENCY (kHz)
MAX1978 toc09
TEMPERATURE (°C)6040200-20-40
Typical Operating Characteristics(VDD= 5V, VCTLI= 1V, VFREQ= GND, RTEC = 1Ω, circuit of Figure 1, TA= +25°C, unless otherwise noted.)
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
SWITCHING FREQUENCY CHANGE
vs. INPUT SUPPLYMAX1978 toc10
VDD (V)
SWITCHING FREQUENCY CHANGE (kHz)
REFERENCE VOLTAGE CHANGE
vs. INPUT SUPPLY
REFERENCE VOLTAGE CHANGE (mV)-2.5
MAX1978 toc11
VDD (V)
REFERENCE VOLTAGE CHANGE
vs. TEMPERATURE
MAX1978 toc12
TEMPERATURE (°C)
REFERENCE VOLTAGE CHANGE (mV)40200-20
REFERENCE LOAD REGULATION
MAX1978 toc13
REFERENCE LOAD CURRENT (mA)
REFERENCE VOLTAGE CHANGE (mV)
ATO VOLTAGE
vs. THERMISTOR TEMPERATURE
MAX1978 toc14
THERMISTOR TEMPERATURE (°C)
ATO VOLTAGE (V)20010
STARTUP AND SHUTDOWN WAVEFORMS
MAX1978 toc15
100µs/div
VSHDN
5V/div
ITEC
500mA/div
IDD
200mA/div
CTLI STEP RESPONSEMAX1978 toc16
1ms/div
1.5V
VCTLI
1V/div
ITEC
1A/div
INPUT SUPPLY STEP RESPONSEMAX1978 toc17
VDD
2V/div
ITEC
20mA/div
10ms/div
THERMAL STABILITY,
COOLING MODEMAX1978 toc18
4s/div
TEMPERATURE
0.001°C/div
Typical Operating Characteristics (continued)(VDD= 5V, VCTLI= 1V, VFREQ= GND, RTEC = 1Ω, circuit of Figure 1, TA= +25°C, unless otherwise noted.)
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
Pin Description
Typical Operating Characteristics (continued)(VDD= 5V, VCTLI= 1V, VFREQ= GND, RTEC = 1Ω, circuit of Figure 1, TA= +25°C, unless otherwise noted.)
MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
Pin Description (continued)
