Fan-Speed Regulators and Monitors

4

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Typical Operating Characteristics

240

245

255

250

260

265

3.0

4.0

3.5

4.5

5.0

5.5

INTERNAL OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

200

220

260

240

280

300

INTERNAL OSCILLATOR FREQUENCY

vs. TEMPERATURE

TEMPERATURE (

°C)

-50

050

100

2.0

2.1

2.3

2.2

2.4

2.5

FEEDBACK VOLTAGE

vs. TEMPERATURE

TEMPERATURE (

°C)

-50

050

100

1.9

1.8

1.80

1.85

1.90

1.95

2.00

2.05

2.10

2.15

2.20

3.0

3.5

4.0

4.5

5.0

5.5

FEEDBACK VOLTAGE vs. SUPPLY

VOLTAGE (DAC SET TO 35)

SUPPLY VOLTAGE (V)

2.0

2.4

2.2

2.8

2.6

3.0

3.2

3.6

3.4

3.8

3.0

3.4

3.8

4.2

4.6

3.2

3.6

4.0

4.4

4.8 5.0

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

1.5

2.0

3.0

2.5

3.5

4.0

-40

0

-20

20

40

60

80

100

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (

°C)

TIMING CHARACTERISTICS (continued)

Note 2: GPIO2, GPIO3, and GPIO4 only in the MAX6651.

Note 3: Note that the transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL’s

falling edge.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

µs

ns

050

0.6

Setup Time for Stop Condition

Pulse Width of Spike Suppressed