LT3837

V_CC to GND ............................................... 0.3V to 22V
UVLO, SYNC Pin Voltage ............................0.3V to V_CC
SENSE, SENSE+ Pin Voltage .................. 0.5V, +0.5V
FB Pin Current .......................................................±2mA
VC Pin Current ......................................................±1mA
Operating Junction Temperature Range
(Notes 2, 3) .......................................... 40 to 125
Storage Temperature Range ................ 65 to 150
Lead Temperature (Soldering, 10 sec) ................. 300
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125 when overtemperature protection is active.Continuous operation above the specifi ed maximum operating junction temperature may impair device reliability.

The LT®3837 is an isolated switching regulator controller designed for medium power fl yback topologies. A typical application is 10W to 60W with the part powered from a DC supply.

The LT3837 is a current mode controller that regulates an output voltage based on sensing the secondary voltage via a transformer winding during fl yback. This allows for tight output regulation without the use of an optoisolator, improving dynamic response and reliability. Synchronous rectifi cation increases converter effi ciency and improves output cross regulation in multiple output converters.

The LT3837 operates in forced continuous conduction mode which improves cross regulation in multiple winding applications. Switching frequency is user programmable and can be externally synchronized. The part also has load compensation, undervoltage lockout and soft-start circuitry. The LT3837 is available in a thermally enhanced 16-pin TSSOP package.