LT1936EMS8E

LT1936 is a current-mode PWM step-down DC-DC switching regulator delivering 1.4A continuous output current. EMS8E refers to commercial temperature grade specification and thermally enhanced 8-lead MSOP surface mount package. The component is available in lead-free tape-and-reel packaging for automated high-volume SMT manufacturing.

This buck converter features an ultra-wide input voltage range from 3.6V to 36V, compatible with automotive 12V batteries, 24V industrial power supplies and unregulated AC-DC wall adapters. An internal power switch with guaranteed 1.9A peak current limit supports steady 1.4A full-load output across most input voltage conditions.

Fixed 500kHz switching frequency enables adoption of compact low-profile inductors and multilayer ceramic capacitors, minimizing overall solution size while maintaining low and predictable output voltage ripple. The output voltage is continuously adjustable down to 1.2V via an external resistor divider to satisfy diverse regulated voltage requirements.

Multiple built-in protection and optimization functions are integrated. A soft-start circuit suppresses inrush current during power-up to protect input power sources. Cycle-by-cycle current limiting, frequency foldback and thermal shutdown mechanisms offer comprehensive short-circuit protection throughout the entire input voltage range. Users can choose internal compensation for simplified peripheral layout or external compensation to optimize transient response performance.

The dedicated shutdown pin cuts quiescent current to less than 2μA under standby mode, greatly extending runtime for battery-powered portable devices. Current-mode control architecture delivers outstanding line and load regulation, ensuring stable output voltage against input fluctuation and dynamic load changes.

The device is encapsulated in an 8-pin thermally enhanced MSOP plastic package with a bottom exposed thermal pad. The exposed pad significantly improves heat dissipation efficiency during continuous high-current operation and provides reliable grounding connection for switching power circuits. Moisture Sensitivity Level is MSL1; no time restriction is applied to reflow soldering procedures after the original vacuum sealed package is opened. Continuous tape reel feeding seamlessly cooperates with automatic pick-and-place equipment for uninterrupted mass electronic assembly production.

Commercial operating temperature range covers -40°C to +85°C, enabling reliable continuous operation in automotive auxiliary electronic modules, industrial control equipment, field monitoring terminals and portable test instruments under variable temperature environments. Manufactured with lead-free fabrication processes, the component complies with global RoHS environmental directives. High integration reduces the quantity of external discrete components, simplifies high-input-voltage step-down power supply circuit design and shortens hardware development cycles.

Automotive interior electronic equipment, dashboard module power regulation circuits

24V industrial control system auxiliary isolated and non-isolated power rails

Unregulated wall adapter post-stage step-down voltage conversion modules

Portable field inspection instruments and battery-powered data acquisition devices

Remote IoT sensor nodes powered by wide-range DC input sources