Features and Benefits
- Wide Input Range: 3.6V to 36V
- Short-Circuit Protected Over Full Input Range
- 1.9A Guaranteed Minimum Switch Current
- 5V at 1.4A from 10V to 36V Input
- 3.3V at 1.4A from 7V to 36V Input
- 5V at 1.2A from 6.3V to 36V Input
- 3.3V at 1.2A from 4.5V to 36V Input
- Output Adjustable Down to 1.20V
- 500kHz Fixed Frequency Operation
- Uses Small Ceramic Capacitors
- Internal or External Compensation
- Low Shutdown Current: <2µA
- Thermally Enhanced 8-Lead MSOP Package
The LT1936 is a current mode PWM step-down DC/DC converter with an internal 1.9A power switch, packaged in a tiny, thermally enhanced 8-lead MSOP. The wide input range of 3.6V to 36V makes the LT1936 suitable for regulating power from a wide variety of sources, including automotive batteries, 24V industrial supplies and unregulated wall adapters. Its high operating frequency allows the use of small, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.
Cycle-by-cycle current limit, frequency foldback and thermal shutdown provide protection against shorted outputs, and soft-start eliminates input current surge during startup. Transient response can be optimized by using external compensation components, or board space can be minimized by using internal compensation. The low current (<2µA) shutdown mode enables easy power management in battery-powered systems.
- Automotive Battery Regulation
- Industrial Control Supplies
- Unregulated Wall Adapters
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 825 is a monolithic step-down DC/DC switching regulator featuring the LT1936. The demo board is optimized for 3.3V output at 1.2A from a 4.5V to 36V input or a 5V, 1.2A output from a 6.8V to 36V input. The output is selectable by placing the JP1 jumper at the 3.3V or 5V position.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.