Features and Benefits
- Low Quiescent Current: 35μA at 12VIN to 3.3VOUT
- Integrated Boost and Catch Diodes
- Input Range: 4V to 40V
- 3.3V at 250mA from 4V to 40V Input
- 5V at 250mA from 5.7V to 40V Input
- Low Output Ripple: <10mV
- <1μA in Shutdown Mode
- Output Voltage: 1.25V to 16V
- Hysteretic Mode Control
- Low Ripple Burst Mode® Operation at Light Loads
- Continuous Operation at Higher Loads
- Solution Size as Small as 50mm2
- Low Profile (0.75mm) 2mm × 3mm Thermally Enhanced 8-Lead DFN Package
The LT3470A is a micropower step-down DC/DC converter that integrates a 440mA power switch, catch diode and boost diode into low profile 2mm × 3mm DFN package. The LT3470A combines Burst Mode and continuous operation to allow the use of tiny inductor and capacitors while providing a low ripple output to loads of up to 250mA.
With its wide input range of 4V to 40V, the LT3470A can regulate a wide variety of power sources, from 2-cell Li-Ion batteries to unregulated wall transformers and lead-acid batteries. Quiescent current in regulation is just 35μA in a typical application while a zero current shutdown mode disconnects the load from the input source, simplifying power management in battery-powered systems. Fast current limiting and hysteretic control protects the LT3470A and external components against shorted outputs, even at 40V input. The LT3470A has higher output current and improved start-up and dropout performance compared to the LT3470.
|Vin Min Startup||Switch Current|
- Automotive Battery Regulation
- Power for Portable Products
- Distributed Supply Regulation
- Industrial Supplies
- Wall Transformer Regulation
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 1382 is a 40V micropower DFN buck regulator featuring the LT3470A. The LT3470A has a higher peak switch current and improved start-up and dropout compared with the non-"A" version. The demo board is optimized for 3.3V output at up to 250mA load current for a steady state input voltage range of 4V to 36V. With its wide input voltage range, high efficiency internal power switch, extremely low dropout operation, hysteretic current-mode, integrated boost and catch diodes and tiny DFN package, the LT3470A is a very versatile and powerful IC for DC/DC converters that require extremely compact space, high efficiency and high input voltage.
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.