Isolated Transformer Driver
for PCMCIA Applications
MAX845
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
) ...............................................-0.3V to +7V
Control Input Voltage (SD, FS) ...................-0.3V to (V
CC
+ 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 (T
A
= +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
(V
CC
= 5V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Switch On-Resistance
D1, D2; 100mA
FS = V
CC
= 4.5V
Switch Frequency
FS = V
CC
= 5.5V
FS = 0V, V
CC
= 4.5V
FS = 0V, V
CC
= 5.5V
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
High
Low
FS = 0V
FS = V
CC
2.5
10
2.2
2.4
0.8
50
No load, SD = 0V, FS = V
CC
SD = V
CC
High
Low
10
2.4
0.8
450
550
CONDITIONS
MIN
TYP
1.5
675
860
500
575
1.1
0.4
5.0
mA
µA
V
pA
V
µA
V
MAX
4.0
900
1100
kHz
UNITS
Ω
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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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
