Features and Benefits
- Tiny Solution Size
- Low Quiescent Current:
- 150µA in Active Mode (VIN = 3.6V, VOUT = 15V, No Load)
- 1µA in Shutdown Mode
- Internal 1A, 36V Switch
- Integrated Schottky Diode
- Integrated PNP Output Disconnect
- Internal Reference Override Pin
- PGOOD Pin
- 25V at 80mA from 3.6V Input
- Auxiliary NPNs for Intermediate Bias Voltages (LT3473A)
- Automatic Burst Mode® Operation at Light Load
- Constant Switching Frequency: 1.2MHz
- Thermal Shutdown
- Input Range: 2.2V to 16V
- Low Profile (3mm × 3mm) DFN Package (LT3473)
- Low Profile (4mm × 3mm) DFN Package (LT3473A)
The LT3473/LT3473A are micropower step-up DC/DC converters with integrated Schottky diode and output disconnect circuitry in low profile DFN packages. The small package size, high level of integration and the use of tiny SMT components yield a solution size of less than 50mm2. The internal 1A switch allows the device to deliver 25V at up to 80mA from a Li-Ion cell, while automatic Burst Mode operation maintains efficiency at light load. An auxiliary reference input (CTRL) allows the user to override the internal 1.25V feedback reference with any lower value, allowing full control of the output voltage during operation. A PGOOD pin sinks current when the output voltage reaches 90% of final value.
The LT3473A includes two NPN transistors for generating intermediate bias voltages from the output and is offered in a 12-lead (4mm × 3mm) DFN package. The LT3473 does not include these NPNs and is offered in an 8-lead (3mm × 3mm) package.
The rugged 36V switch and output disconnect circuitry allow outputs up to 34V to be easily generated in a simple boost topology.
- OLED Bias
- CCD Bias
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 DC883 features the LT3473 micropower step-up DC/DC converters with integrated Schottky diode and output disconnect circuitry. The output on DC883 is 25V at up to 80mA from a 3~4.2V input, while automatic Burst Mode operation maintains efficiency at light load. The lithium ion battery input voltage range, high output voltage, internal NPN power switch, minimal external components and simple design make the LT3473 an excellent solution for OLED and CCD Bias.
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:
LT3473 Companion Parts
Recommended Related Parts
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.