MAX1968EUI datasheet(2/16 Pages) MAXIM

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Power Drivers for Peltier TEC Modules

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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

otherwise noted. Typical values are at TA = +25

°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.

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Range

VDD

3.0

5.5

VDD = 5V, ITEC = 0 to

±3A,

VOUT = VOS1 - VOS2 (MAX1968)

-4.3

+4.3

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

VOUT = VOS1 (MAX1969)

4.3

VDD = 3V, ITEC = 0 to

±3A,

VOUT = VOS1 - VOS2 (MAX1968)

-2.3

+2.3

Output Voltage Range

VOUT

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

VOUT = VOS1 (MAX1969)

2.3

MAX1968

±3

Maximum TEC

Current

ITEC(MAX)

MAX1969

Reference Voltage

VREF

VDD = 3V to 5.5V, IREF = 150µA

1.485

1.500

1.515

Reference Load

Regulation

∆VREF

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

1.2

VMAXI_ = VREF

140

150

160

VOS1 < VCS

VMAXI_ = VREF/3

VMAXI_ = VREF

140

150

160

Current-Sense

Threshold Accuracy

VOS1 > VCS

VMAXI_ = VREF/3

Switch-Fault Reset

Voltage

150

250

VDD = 5V, I = 0.5A

0.04

0.07

NFET On-Resistance

RDS(ON-N)

VDD = 3V, I = 0.5A

0.06

0.08

Ω

VDD = 5V, I = 0.5A

0.06

0.10

PFET On-Resistance

RDS(ON-P)

VDD = 3V, I = 0.5A

0.09

0.12

Ω

VLX = VDD = 5V, TA = +25°C

0.02

NFET Leakage

ILEAK(N)

VLX = VDD = 5V, TA = +85°C1

µA

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.

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