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MAX1968

Power Drivers for Peltier TEC Modules

Maxim Integrated 

MAX1968/MAX1969

Power Drivers for Peltier TEC Modules

Absolute Maximum Ratings

VDD to 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.

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.

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

otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

Input Supply Range

SYMBOL

VDD

CONDITIONS

VDD = 5V, ITEC = 0 to ±3A,

VOUT = VOS1 - VOS2 (MAX1968)

MIN

TYP

MAX

UNITS

3.0

5.5

V

-4.3

+4.3

VDD = 5V, ITEC = 0 to 6A,

VOUT = VOS1 (MAX1969)

Output Voltage Range

VOUT

VDD = 3V, ITEC = 0 to ±3A,

VOUT = VOS1 - VOS2 (MAX1968)

-2.3

4.3

V

+2.3

Maximum TEC

Current

Reference Voltage

ITEC(MAX)

VREF

VDD = 3V, ITEC = 0 to 6A,

VOUT = VOS1 (MAX1969)

MAX1968

MAX1969

VDD = 3V to 5.5V, IREF = 150µA

2.3

±3

A

6

1.485

1.500

1.515

V

Reference Load

Regulation

ΔVREF VDD = 3V to 5.5V, IREF = +10µA to -1mA

1.2

5

mV

Current-Sense

Threshold Accuracy

VOS1 < VCS

VOS1 > VCS

VMAXI_ = VREF

140

150

160

VMAXI_ = VREF/3

40

50

60

mV

VMAXI_ = VREF

140

150

160

VMAXI_ = VREF/3

40

50

60

Switch-Fault Reset

Voltage

50

150

250

mV

NFET On-Resistance

PFET On-Resistance

NFET Leakage

RDS(ON-N)

RDS(ON-P)

ILEAK(N)

VDD = 5V, I = 0.5A

VDD = 3V, I = 0.5A

VDD = 5V, I = 0.5A

VDD = 3V, I = 0.5A

VLX = VDD = 5V, TA = +25°C

VLX = VDD = 5V, TA = +85°C

0.04

0.07

Ω

0.06

0.08

0.06

0.10

Ω

0.09

0.12

0.02

10

µA

1

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