Features: Wide Input Range: 4V to 60V
Output Voltages up to 36V (Step-Down)
Burst Mode® Operation: <100µA Supply Current
<10µA Shutdown Supply Current
±1.3% Reference Accuracy
200kHz Fixed Frequency
Drives N-Channel MOSFET
Programmable Soft-Start
Programmable Undervoltage Lockout
Internal High Voltage Regulator for Gate Drive
Thermal Shutdown
Current Limit Unaffected by Duty Cycle
16-Pin Thermally Enhanced TSSOP PackageApplication Industrial Power Distribution
12V and 42V Automotive and Heavy Equipment
High Voltage Single Board Systems
Distributed Power Systems
Avionics
Telecom PowerSpecificationsInput Supply Voltage (VIN)......................... 65V to 0.3V
Boosted Supply Voltage (BOOST) .............. 80V to 0.3V
Switch Voltage (SW) .................................... 65V to 1V
Differential Boost Voltage
(BOOST to SW) ..................................... 24V to 0.3V
Bias Supply Voltage (VCC) ......................... 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
VC, VFB, CSS, and SHDN Voltages ................ 5V to 0.3V
CSS and SHDN Pin Currents .................... 1mA to 1mA
Operating Junction Temperature Range (Note 2)
LT3724E (Note 3) ..............................40°C to 125°C
LT3724I .............................................40°C to 125°C
Storage Temperature .............................65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
DescriptionThe LT®3724 is a DC/DC controller used for mediumpower, low part count, low cost, high efficiency supplies.It offers a wide 4V-60V inpurange (7.5V minimum startupvoltage) and can implement step-down, step-up, invertingand SEPIC topologies.The LT3724 includes Burst Mode operation, which reducesquiescent current below 100µA and maintains highefficiency at light loads. An internal high voltage biasregulator allows for simple biasing and can be back drivento increase efficiency.
Additional features include fixed frequency current mode control for fast line and load transient response; a gatedriver capable of driving large N-channel MOSFETs; a precision undervoltage lockout function; 10µA shutdown current; short-circuit protection; and a programmable soft-start function that directly controls output voltage slew rates at startup which limits inrush current, minimizes overshoot and facilitates supply sequencing.
The LT3724 is available in a 16-lead thermally enhanced
LT3724 Data Sheet
