For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
3W Primary-Side Transformer H-Bridge Driver
for Isolated Supplies
MAX256
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
Supply Voltage V
CC
..................................................-0.3V to +6V
ST1, ST2, CK_RS, MODE (Note 1)................-0.3V to V
CC
+ 0.3V
ST1, ST2 Maximum Continuous Current (T
A
< +125°C) ....±0.6A
ST1, ST2 Maximum Continuous Current (T
A
< +100°C) ....±0.9A
ST1, ST2 Maximum Continuous Current (T
A
< +85°C) ......±1.0A
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 18.9mW/°C above +70°C)..............1509mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1:
ST1 and ST2 are not protected against short circuits. Damage to the device may result from a short-circuit fault.
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.
PACKAGE THERMAL CHARACTERISTICS (Note 2)
SO-EP
Junction-to-Ambient Thermal Resistance (θ
JA
)...............53°C/W
Junction-to-Case Thermal Resistance (θ
JC
)......................5°C/W
Note 2:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
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