MAX31740 datasheet(4/11 Pages) MAXIM

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MAX31740

Ultra-Simple Fan-Speed Controller

Maxim Integrated │ 4

www.maximintegrated.com

(TA=+25°C,unlessotherwisenoted.)

PWM_OUT OUTPUT FREQUENCY

vs. TEMPERATURE

TEMPERATURE (°C)

110

-40

VDD = 3.3V,

CF = 330nF,

CL = 10pF

POWER-SUPPLY CURRENT

vs. POWER-SUPPLY VOLTAGE

POWER-SUPPLY VOLTAGE (V)

5.0

5.5

4.5

4.0

3.5

500

550

600

650

450

3.0

6.0

CF = 330nF,

DUTY CYCLE = 50%

-40°C

+125°C

MEASURED PWM OUTPUT FREQUENCY

vs. FREQ INPUT CAPACITANCE

FREQ INPUT CAPACITANCE (F)

1.E-07

1.E-08

1.E-09

1.E+02

1.E+03

1.E+04

1.E+05

1.E+01

1.E-10

1.E-06

TA = +25°C

PWM_OUT OUTPUT VOLTAGE HIGH

vs. OUTPUT CURRENT

OUTPUT CURRENT (mA)

-4

-6

-8

3.05

3.10

3.15

3.20

3.25

3.30

3.00

-10

-2

VDD = 3.3V,

TA = +25°C

PWM DUTY CYCLE

vs. DMIN INPUT BIAS

DMIN BIAS (%VDD)

45%

30%

15%

100

VDD = 3.3V,

TA = +25°C

PWM_OUT OUTPUT VOLTAGE LOW

vs. OUTPUT CURRENT

OUTPUT CURRENT (mA)

0.1

0.2

0.3

0.4

VDD = 3.3V,

TA = +25°C

THEROETICAL PWM OUTPUT FREQUENCY

vs. FREQ INPUT CAPACITANCE

FREQ INPUT CAPACITANCE (F)

1.E-07

1.E-08

1.E-09

1.E+02

1.E+03

1.E+04

1.E+05

1.E+01

1.E-10

1.E-06

TA = +25°C

Typical Operating Characteristics

MAX31740 Datasheet(PDF) 4 Page - Maxim Integrated Products

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