High Voltage, Current Mode Switching Regulator Controller

The LT3724 is a DC/DC controller used for medium power, low part count, low cost, 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 LT3724 includes Burst Mode operation, which reduces quiescent current below 100µA and maintains high efficiency at light loads. An internal high voltage bias regulator allows for simple biasing and can be back driven to increase efficiency.

Additional features include fixed frequency current mode control for fast line and load transient response; a gate driver 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.

Applications

* Industrial Power Distribution

* 12V and 42V Automotive and Heavy Equipment

* High Voltage Single Board Systems

* Distributed Power Systems

* Avionics

* Telecom Power

* 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 Package