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Features
- Generates 15V at 45mA, –8V at 90mA from a Li-Ion Cell
- Output Disconnect
- Sequencing: Positive Output Reaches Regulation Before Negative Channel Begins Switching
- Internal Schottky Diodes
- 2MHz Constant Switching Frequency
- Requires Only One Resistor per Channel to Set Output Voltages
- VIN Range: 2.3V to 16V
- Output Voltage Up to 28V
- Short-Circuit Robust
- Capacitor Programmable Soft-Start
- Separate VBAT Pin Allows Separate Sources for Power and Control Circuitry
- Available in 10-Lead (3mm × 3mm) DFN Package
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The LT3487 dual channel switching regulator generates positive and negative outputs for biasing CCD imagers. The device delivers up to –8V at 90mA and 15V at 45mA from a lithium-ion cell, providing bias for many popular CCD imagers. The boost regulator incorporates output disconnect technology to eliminate the DC current path from VIN to the output load that is present in standard boost configurations. The 2MHz switching frequency allows CCD solutions using tiny, low profile capacitors and inductors and generates low noise outputs that are easy to filter. Schottky diodes are internal and the output voltages are set with one resistor per channel, reducing the external component count.
Intelligent soft-start allows sequential soft-start of the two channels with a single capacitor. The soft-start is sequenced such that the output ramp of the negative channel begins after the ramp of the positive channel. Internal sequencing circuitry also disables the negative channel until the positive channel has reached 87% of its final value, ensuring that the sum of the two outputs is always positive.
The LT3487 is available in a 10-pin 3mm × 3mm DFN package.
Applications
- CCD Bias
- TFT LCD Bias
- OLED Bias
- ±Rail Generation for Op Amps
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LT3487
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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. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3487EDD#PBF |
10-Lead DFN (3mm x 3mm w/ EP)
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| LT3487EDD#TRPBF |
10-Lead DFN (3mm x 3mm w/ EP)
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- LT3487EDD#PBF
- Pin/Package Drawing
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10-Lead DFN (3mm x 3mm w/ EP)
- Documentation
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
- LT3487EDD#TRPBF
- Pin/Package Drawing
-
10-Lead DFN (3mm x 3mm w/ EP)
- Documentation
-
HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
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SamacSys
Software & Part Ecosystem
Evaluation Kits 1
DC912A
LT3487EDD Demo Board
Product Detail
DC912A: Demo Board for the LT3487 Boost and Inverting Switching Regulator for CCD Bias.
Resources
Evaluation Kits1
Tools & Simulations 1
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.
Lt Spice