MAX1978ETM+ Maxim Integrated Products, MAX1978ETM+ Datasheet

MAX1978ETM+

Manufacturer Part Number

MAX1978ETM+

Description

IC CNTRLR INT TEMP 48TQFN

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1978ETM.pdf (20 pages)

Specifications of MAX1978ETM+

Applications

Thermoelectric Cooler

Voltage - Supply

3 V ~ 5.5 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

48-TQFN Exposed Pad

Output Voltage Range

- 4.3 V to + 4.3 V

Output Current

6 A

Input Voltage Range

3 V to 5.5 V

Input Current

30 mA

Power Dissipation

2105 mW

Operating Temperature Range

- 40 C to + 85 C

Mounting Style

SMD/SMT

Ic Output Type

Current

Sensing Accuracy Range

Â± 1%

Supply Current

30mA

Supply Voltage Range

3V To 5.5V

Sensor Case Style

QFN

No. Of Pins

Filter Terminals

SMD

Rohs Compliant

Yes

Temperature Sensing Range

-40Â°C To +85Â°C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current - Supply

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Current page: 1 of 20
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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.

19-2490; Rev 3; 3/10

Typical Operating Circuit appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Fiber Optic Laser Modules

WDM, DWDM Laser-Diode Temperature Control

Fiber Optic Network Equipment

EDFA Optical Amplifiers

Telecom Fiber Interfaces

ATE

________________________________________________________________ Maxim Integrated Products

General Description

Applications

Controllers for Peltier Modules

Integrated Temperature

o Smallest, Safest, Most Accurate Complete

o On-Chip Power MOSFETS—No External FETs

o Circuit Footprint < 0.93in

o Circuit Height < 3mm

o Temperature Stability to 0.001°C

o Integrated Precision Integrator and Chopper

o Accurate, Independent Heating and Cooling

o Eliminates Surges By Directly Controlling

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)

* EP = Exposed pad.

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

MAX1978ETM+

MAX1979ETM+

Single-Chip Controller

Stabilized Op Amps

Current Limits

TEC Current

PART

PGND2

TOP VIEW

SHDN

N.C.

OS2

LX2

*ELECTRICALLY CONNECTED TO THE UNDERSIDE METAL SLUG.

NOTE: GND IS CONNECTED TO THE UNDERSIDE METAL SLUG.

T EM P R A N G E

- 40°C to + 85°C

Ordering Information

TQFN-EP

MAX1978

MAX1979

Pin Configuration

48 Thin QFN-EP*

PIN-PACKAGE

Features

FREQ

N.C

PGND1

LX1

PGND1

LX1

N.C.

LX1

GND

Related parts for MAX1978ETM+

MAX1978ETM+ Summary of contents

Page 1

... 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) PART MAX1978ETM+ MAX1979ETM Exposed pad. + Denotes a lead(Pb)-free/RoHS-compliant package. TOP VIEW + OS2 1 N.C. ...

Page 2

Integrated Temperature Controllers for Peltier Modules ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD SHDN, MAXV, MAXIP, MAXIN, CTLI, OT GND............................................-0.3V to +6V FREQ, COMP, OS1, OS2, CS, REF, ITEC, AIN+, AIN-, AOUT, INT-, INTOUT, BFB+, ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T SHDN unless otherwise noted. Typical values ...

Page 4

Integrated Temperature Controllers for Peltier Modules ELECTRICAL CHARACTERISTICS (continued 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T SHDN DD DD ...

Page 5

ELECTRICAL CHARACTERISTICS ( 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T SHDN unless otherwise noted.) (Note 5) PARAMETER ...

Page 6

Integrated Temperature Controllers for Peltier Modules ELECTRICAL CHARACTERISTICS (continued 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T SHDN DD DD ...

Page 7

GND, RTEC = 1Ω, circuit of Figure CTLI FREQ EFFICIENCY vs. TEC CURRENT 1.1Ω TEC ...

Page 8

Integrated Temperature Controllers for Peltier Modules ( GND, RTEC = 1Ω, circuit of Figure CTLI FREQ SWITCHING FREQUENCY CHANGE vs. INPUT SUPPLY -10 -15 -20 -25 ...

Page 9

GND, RTEC = 1Ω, circuit of Figure CTLI FREQ THERMAL STABILITY, ROOM TEMPERATURE TEMPERATURE 0.001°C/div I = +25°C TEC T = +25°C A 4s/div PIN NAME Output Sense 2. ...

Page 10

Integrated Temperature Controllers for Peltier Modules PIN NAME 23 AIN- Undedicated Chopper-Stabilized Amplifier Inverting Input 24 AOUT Undedicated Chopper-Stabilized Amplifier Output Power 1 Inputs. Must be same voltage Bypass to PGND1 with a ...

Page 11

Controllers for Peltier Modules ON OFF SHDN FREQ REF 1.5V REFERENCE MAXV MAX V = TEC MAXV MAXIP MAX TEC MAXIP (0.15V/R ) REF SENSE MAX ...

Page 12

Integrated Temperature Controllers for Peltier Modules Detailed Description The power stage of the MAX1978/MAX1979 thermoelectric cooler (TEC) temperature controllers consists of two switching buck regulators that operate together to directly control TEC current. This configura- tion creates a differential voltage ...

Page 13

Switching Frequency FREQ sets the switching frequency of the internal oscil- lator. The oscillator frequency is 500kHz when FREQ = GND. The oscillator frequency is 1MHz when FREQ = V . The 1MHz setting allows minimum inductor and fil- DD ...

Page 14

Integrated Temperature Controllers for Peltier Modules 10µF 0.01µF UNDERTEMP ALARM OVERTEMP ALARM DC CURRENT MONITOR 20kΩ 1% 80.6kΩ 1µF THERMISTOR VOLTAGE MONITOR REF 69.8kΩ 105kΩ Figure 2. MAX1979 Typical Application Circuit. MAXIN sets the maximum TEC current circuit ...

Page 15

REF 69.8kΩ 1% AIN+ AOUT 80.6kΩ 1% AIN- 20kΩ 1% MAX1978 BFB- MAX1979 x50 FB- V FB+ Figure 3. Thermistor Voltage Monitor Design Procedure Inductor Selection Small surface-mount inductors are ideal for use with the MAX1978/MAX1979. Select the output inductors ...

Page 16

Integrated Temperature Controllers for Peltier Modules The MAX1979 controls the TEC current in only one direction (unipolar). Set the maximum unipolar TEC cur- rent by applying a voltage to MAXIP. Connect MAXIN to MAXIP when using the MAX1979. The equation ...

Page 17

Drive SHDN low to place the MAX1978/MAX1979 in a power-saving shutdown mode. When the MAX1978/ MAX1979 are in shutdown, the TEC is off (V V decay to GND) and input supply current lowers to OS2 2mA (typ). ITEC is a ...

Page 18

Integrated Temperature Controllers for Peltier Modules where The gain needed to move the 0dB crossover point up to the desired frequency. In this case -4dB = 0. The desired crossover frequency, 1.5Hz in this ...

Page 19

INPUT 3V TO 5.5V ON OFF OVERTEMP ALARM UNDERTEMP ALARM TEMP MONITOR TEC CURRENT MONITOR VOLTAGE LIMIT HEATING CURRENT LIMIT COOLING CURRENT LIMIT Chip Information TRANSISTOR COUNT: 6023 PROCESS: BiCMOS ______________________________________________________________________________________ Integrated Temperature Controllers for Peltier Modules Typical Operating Circuit ...

Page 20

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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