MAX1978ETM+;MAX1979ETM+;MAX1978ETM+T;MAX1979ETM+T;中文规格书,Datasheet资料

MAX1978ETM+;MAX1979ETM+;MAX1978ETM+T;MAX1979ETM+T;中文规格书,Datasheet资料
MAX1978ETM+;MAX1979ETM+;MAX1978ETM+T;MAX1979ETM+T;中文规格书,Datasheet资料

General Description

The 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.

Applications

Fiber Optic Laser Modules

WDM, DWDM Laser-Diode Temperature Control Fiber Optic Network Equipment EDFA Optical Amplifiers Telecom Fiber Interfaces ATE

Features

o Smallest, Safest, Most Accurate Complete Single-Chip Controller

o On-Chip Power MOSFETS—No External FETs o Circuit Footprint < 0.93in 2o Circuit Height < 3mm

o Temperature Stability to 0.001°C

o Integrated Precision Integrator and Chopper Stabilized Op Amps

o Accurate, Independent Heating and Cooling Current Limits

o Eliminates Surges By Directly Controlling TEC Current

o Adjustable Differential TEC Voltage Limit o Low-Ripple and Low-Noise Design o TEC Current Monitor o Temperature Monitor

o Over- and Undertemperature Alarm o Bipolar ±3A Output Current (MAX1978)o Unipolar +6A Output Current (MAX1979)

MAX1978/MAX1979

Integrated Temperature

Controllers for Peltier Modules

________________________________________________________________Maxim Integrated Products

1

Ordering Information

Pin Configuration

19-2490; Rev 3; 3/10

For pricing, delivery, and ordering information,please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at https://www.360docs.net/doc/a07705613.html,.

Typical Operating Circuit appears at end of data sheet.

+Denotes a lead(Pb)-free/RoHS-compliant package.

M A X 1978/M A X 1979

Integrated Temperature

Controllers for Peltier Modules

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V = PV 1 = PV 2 = V = 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T = 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.

V DD to GND..............................................................-0.3V to +6V SHDN , MAXV, MAXIP, MAXIN,

CTLI, OT , UT to 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 (V DD + 0.3V)PV DD 1, PV DD 2 to V DD ...........................................-0.3V to +0.3V PV DD 1, PV DD 2 to GND...............................-0.3V to (V DD + 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 (T A = +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 PV DD . Applications that forward bias these diodes should not exceed the IC’s

package power dissipation limits.

Note 2:Solder underside metal slug to PCB ground plane.

MAX1978/MAX1979

Integrated Temperature

Controllers for Peltier Modules

ELECTRICAL CHARACTERISTICS (continued)

(V = PV 1 = PV 2 = V SHDN = 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T = 0°C to +85°C ,

M A X 1978/M A X 1979

Integrated Temperature

Controllers for Peltier Modules 4_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V DD = PV DD 1 = PV DD 2 = V SHDN = 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T A = 0°C to +85°C ,

MAX1978/MAX1979

Integrated Temperature

Controllers for Peltier Modules

_______________________________________________________________________________________5

ELECTRICAL CHARACTERISTICS

(V DD = PV DD 1 = PV DD 2 = V SHDN = 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T A = -40°C to +85°C ,unless otherwise noted.) (Note 5)

Note 4:CTLI gain is defined as:

Note 5:Specifications to -40°C are guaranteed by design, not production tested.

M A X 1978/M A X 1979

Integrated Temperature

Controllers for Peltier Modules 6_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

MAX1978/MAX1979

Integrated Temperature

Controllers for Peltier Modules

_______________________________________________________________________________________7

EFFICIENCY vs. TEC CURRENT

V DD = 5V

TEC CURRENT (A)

E F F I C I E N C Y (%)

2.01.5

1.0

0.5

102030405060

70809000

2.5

EFFICIENCY vs. TEC CURRENT

V DD

= 3.3V

TEC CURRENT (A)

2.0

1.5

0.5

1.0

1020

304050

60708000

2.5E F F I C I E

N C Y (%)

OUTPUT-VOLTAGE RIPPLE WAVEFORMS

M A X 1978 t o c 03

400ns/div

V OS2100mV/div

AC-COUPLED

V

OS1100mV/div AC-COUPLED

V OS1 - V OS150mV/div

INPUT SUPPLY RIPPLE

M A X 1978 t o c 04

200ns/div V DD

20mV/div AC-COUPLED

TEC CURRENT vs. CTLI VOLTAGE

20ms/div V CTLI 1V/div I TEC 2A/div

ZERO-CROSSING TEC CURRENT

M A X 1978 t o c 06

1ms/div

V CTLI 200mV/div

I TEC 500mA/div

1.5V

0A

V ITEC vs. TEC CURRENT

M A X 1978 t o c 07

TEC CURRENT (A)

V I T E C (V )

2

1

-1

-2

0.51.0

1.5

2.02.5

3.00-3

3

TEC CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

I T E C (A )

80

60

40

20

-20

0.995

1.000

1.0051.0100.990

-40

SWITCHING FREQUENCY vs. TEMPERATURE

S W I T C H I N G F R E Q U E N C Y (k H z )

494496498500502504506508

492TEMPERATURE (°C)

80

60

40

20

-20

-40

Typical Operating Characteristics

(V DD = 5V, V CTLI = 1V, V FREQ = GND, RTEC = 1?, circuit of Figure 1, T A = +25°C, unless otherwise noted.)

M A X 1978/M A X 1979

Integrated Temperature

Controllers for Peltier Modules 8_______________________________________________________________________________________

SWITCHING FREQUENCY CHANGE

vs. INPUT SUPPLY

M A X 1978 t o c 10

V DD (V)

S W I T C H I N G F R E Q U E N C Y C H A N G E (k H z )

5.0

4.5

4.0

3.5

-30-25-20-15-10-50510-353.0

5.5

REFERENCE VOLTAGE CHANGE

vs. INPUT SUPPLY

R E F E R E N C E V O L T A G E C H A N G E (m V )

-2.5-2.0-1.5-1.0-0.500.51.0-3.0

M A X 197 t o c 11

V DD (V) 5.0

4.5

4.0

3.5

3.0

5.5REFERENCE VOLTAGE CHANGE

vs. TEMPERATURE

M A X 1978 t o c 12

TEMPERATURE (°C)

R E F E R E N C E V O L T A G E C H A N G E (m V )

6040200-20-3-2-10123

-4

-4080

REFERENCE LOAD REGULATION

REFERENCE LOAD CURRENT (mA)R E F E R E N C E V O L T A G E

C H A N G E (m V )

0.8

0.6

-0.2

0.2

0.4

-0.8-0.6-0.4-0.200.20.40.6-1.0

-0.4

1.0

ATO VOLTAGE

vs. THERMISTOR TEMPERATURE

THERMISTOR TEMPERATURE (°C)

30

20

10

-10

40

50

60

STARTUP AND SHUTDOWN WAVEFORMS

M A X 1978 t o c 15

100μs/div

V SHDN 5V/div

I TEC 500mA/div

I DD

200mA/div

CTLI STEP RESPONSE

M A X 1978 t o c 16

1ms/div 1.5V

0A

V CTLI 1V/div I TEC

1A/div

INPUT SUPPLY STEP RESPONSE

M A X 1978 t o c 17

1A

0V

V DD 2V/div

I TEC 20mA/div

10ms/div THERMAL STABILITY,COOLING MODE

4s/div

TEMPERATURE 0.001°C/div Typical Operating Characteristics (continued)

(V DD = 5V, V CTLI = 1V, V FREQ = GND, RTEC = 1?, circuit of Figure 1, T A = +25°C, unless otherwise noted.)

MAX1978/MAX1979

Integrated Temperature

Controllers for Peltier Modules

THERMAL STABILITY,ROOM TEMPERATURE

4s/div TEMPERATURE 0.001°C/div I TEC = +25°C T A = +25°C THERMAL STABILITY,HEATING MODE

4s/div TEMPERATURE 0.001°C/div

T TEC = +25°C T A = +5°C

TEMPERATURE ERROR vs. AMBIENT TEMPERATURE

M A X 1978 t o c 21

AMBIENT TEMPERATURE (°C)

T E M P E R A T U R E E R R O R (°C )

304010200-10-0.02-0.0100.010.020.03-0.03

-2050

Typical Operating Characteristics (continued)

(V DD = 5V, V CTLI = 1V, V FREQ = GND, RTEC = 1?, circuit of Figure 1, T A = +25°C, unless otherwise noted.)

M A X 1978/M A X 1979

Integrated Temperature

Controllers for Peltier Modules 10______________________________________________________________________________________

分销商库存信息:

MAXIM

MAX1978ETM+MAX1979ETM+MAX1978ETM+T MAX1979ETM+T

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