LT3844

Input Supply Voltage (V_IN)......................... 65V to 0.3V
Boosted Supply Voltage (BOOST) .............. 80V to 0.3V
Switch Voltage (SW) (Note 8) ...................... 65V to 1V
Differential Boost Voltage
(BOOST to SW) .......................................... 24V to 0.3V
Bias Supply Voltage (V_CC) ......................... 24V to 0.3V
SENSE+ and SENSE Voltages ................. 40V to 0.3V
Differential Sense Voltage
(SENSE+ to SENSE) ..................................... 1V to 1V
BURST_EN Voltage...................................... 24V to 0.3V
SYNC, VC, VFB, CSS, and SHDN Voltages ..... 5V to 0.3V
SHDN Pin Currents ................................................... 1mA
Operating Junction Temperature Range (Note 2)
LT3844E (Note 3) ...................................40 to 125
LT3844I ..................................................40 to 125
Storage Temperature .............................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: The LT3844 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 specified maximum operating junction temperature may impair device reliability.
Note 3: The LT3844E is guaranteed to meet performance specifications from 0 to 125 junction temperature. Specifications over the 40 to 125 operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3844I is guaranteed over the full 40 to 125 operating junction temperature range.

The LT®3844 is a DC/DC controller used for medium power, low part count, high efficiency supplies. It offers a wide 4V-60V input range (7.5V minimum startup voltage) and can implement step-down, step-up, inverting and SEPIC topologies.

The LT3844 includes Burst Mode operation, which reduces quiescent current below 120A and maintains high efficiency at light loads. An internal high voltage bias regulator allows for simple biasing.Additional features include current mode control for fast line and load transient response; programmable fixed operating frequency that can be synchronized to an external clock for noise sensitive applications; a gate driver capable of driving large N-channel MOSFETs; a precision
undervoltage lockout function; 10A shutdown current; short-circuit protection and a programmable soft-start function.

The LT3844 is available in a 16-lead thermally enhanced TSSOP package.