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MAX845

Isolated Transformer Driver for PCMCIA Applications

Maxim Integrated 

Isolated Transformer Driver

for PCMCIA Applications

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (VCC) ...............................................-0.3V to +7V

Control Input Voltage (SD, FS) ...................-0.3V to (VCC + 0.3V)

Peak Output Switch Current (D1, D2) ......................................1A

Output Switch Voltage (D1, D2) .............................................12V

Average Output Switch Current (D1, D2) .........................200mA

Continuous Power Dissipation (TA = +70°C)

SO (derate 5.88mW/°C above +70°C) .........................471mW

µMAX (derate 4.10mW/°C above +70°C) ....................330mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +160°C

Junction Temperature ......................................................+150°C

Lead Temperature (soldering, 10sec) .............................+300°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.

ELECTRICAL CHARACTERISTICS

(VCC = 5V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

Switch On-Resistance

Switch Frequency

Operating Supply Current (Note 1)

Shutdown Supply Current (Note 2)

Shutdown Input Threshold

Shutdown Input Leakage Current

FS Input Threshold

FS Input Current

Minimum Start-Up Voltage

CONDITIONS

D1, D2; 100mA

FS = VCC = 4.5V

FS = VCC = 5.5V

FS = 0V, VCC = 4.5V

FS = 0V, VCC = 5.5V

No load, SD = 0V, FS = VCC

SD = VCC

High

Low

High

Low

FS = 0V

FS = VCC

MIN TYP MAX UNITS

1.5

4.0

Ω

450

675

900

550

860 1100

kHz

500

575

1.1

5.0

mA

0.4

µA

2.4

V

0.8

10

pA

2.4

V

0.8

50

µA

10

2.5

2.2

V

Note 1: Operating supply current is the current used by the MAX845 only. Load current is not included.

Note 2: Shutdown supply current includes output switch leakage currents.

2 _______________________________________________________________________________________

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