Rainbow-electronics MAX6661 Manual de usuario descargar pdf (Pagina 2)

MAX6661

Remote Temperature-Controlled Fan-Speed

Regulator with SPI-Compatible Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= 3V to 5.5V, V

FAN

= 12V, T

= -40°C to +125°C, unless otherwise specified. Typical values are at V

= 3.3V and T

+25°C.) (Notes 1 and 2)

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.

, ALERT, OVERT ...............................................-0.3V to +6V

FAN

, TACH IN, FAN .............................................-0.3V to +16V

DXP, CS, SDOUT, GAIN, SCL, SDIN..........-0.3V to (V

+ 0.3V)

DXN ..........................................................................-0.3V to +1V

SDOUT Current ...................................................-1mA to +50mA

DXN Current ......................................................................±1mA

FAN Out Current ..............................................................500mA

Continuous Power Dissipation (T

= +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW

Operating Temperature Range ........................ -40°C to +125°C

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

ADC AND POWER SUPPLY

0.125 °C

Temperature Resolution

(Note 3)

11 Bits

= +60°C to +100°C-1 +1°C

= +25°C to +125°C-3 +3°C

Remote-Junction Temperature

Measurement Error (Note 4)

= +85°C,

= 3.3V

= -40°C to +125°C-5 +5°C

Fan-Speed Measurement

Accuracy

±25 %

Supply Voltage Range V

3.0 5.5 V

FAN

Supply Voltage Range V

FAN

4.5 13.5 V

Conversion Time 0.25 s

Conversion Rate Timing Error -25 +25 %

Undervoltage Lockout (UVLO)

Threshold

UVLO

falling 2.50 2.80 2.95 V

UVLO Threshold Hysteresis V

HYST

90 mV

POR Threshold (V

rising 1.4 2.0 2.5 V

POR Threshold Hysteresis 90 mV

Standby Supply Current I

SHDN

Shutdown, configuration bit 6 = 1 3 20 µA

Operating Supply Current I

Fan off 450 700 µA

DXN Source Voltage V

DXN

0.7 V

TACH Input Transition Level V

FAN

= 12V 10.5 V

TACH Input Hysteresis V

FAN

= 12V 190 mV

TACH Input Resistance 250 kΩ

Fan Output Current I

250 mA

Fan Output Current Limit I

(Note 5) 320 410 mA

Fan Output On-Resistance R

ONF

250mA load 4 Ω

1 2 3 4 5 6 7 ... 18 19

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Rainbow-electronics MAX6661 Manual de usuario Pagina 2

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