Features and Benefits
- Internal 40V Schottky Diode
- One Resistor Feedback (Other Resistor Inside)
- Internal 40V, 200mA/400mA Power Switch
- Generates Regulated Negative Outputs to –38V
- Low Quiescent Current:
- 40μA in Active Mode
- <1μA in Shutdown Mode
- Low VCESAT Switch: 200mV at 150mA
- Wide Input Range: 2.5V to 16V
- Uses Small Surface Mount Components
- Output Short-Circuit Protected
- Available in a 6-Lead SOT-23 (LT3483 Only) and Low Profile 8-Lead DFN (2mm × 2mm × 0.75mm) Packages
The LT3483/LT3483A are micropower inverting DC/DC converters with integrated Schottky and one resistor feedback. The small package size, high level of integration and use of tiny surface mount components yield a solution size as small as 40mm2. The devices feature a quiescent current of only 40μA at no load, which further reduces to 0.1μA in shutdown. A current limited, fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad range of load current. A precisely trimmed 10μA feedback current enables one resistor feedback and virtually eliminates feedback loading of the output. The 40V switch enables voltage outputs up to –38V to be generated without the use of costly transformers. The LT3483/LT3483A’s low 300ns off-time permits the use of tiny low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications.
- LCD Bias
- Handheld Computers
- Battery Backup
- Digital Cameras
- OLED Bias
Evaluation Kits (2)
Demonstration circuit SCP-LT3483-EVALZ is an inverting converter featuring the LT3483ES6. The converter generates –15V at 8mA to 40mA from a 2.7–12V input using a dual coupled inductor in an inverting flyback topology.
Like all boards in the Signal Chain Power series, this board is designed to be easily plugged into other SCP boards to form a complete signal chain power system, enabling fast evaluation of low power signal chains. To evaluate this board, some universal SCP hardware is required, namely:
To properly evaluate SCP series demo boards, you will need the SCP Configurator companion software. SCP Configurator can help you choose the right board and to-pology for your design.
Note that the Demo Manual does not cover details important to the operation and configuration regarding the LT3483 buck regulator. Please refer to the LT3483 data sheet for a complete description of the part.
Documentation & Resources
R365 Reliability Data3/23/2018
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.