LT3482 - 90V Boost DC/DC Converter with APD Bias Current Monitor
Features
- High Output Voltage: Up to 90V
- Integrated Schottky Diodes
- 48V, 280mA Internal Switch
- High Side APD Current Monitor
- Adjustable Switching Frequency: 650kHz or 1.1MHz
- Wide VIN Range: 2.5V to 16V
- Surface Mount Components
- Low Shutdown Current: <1µA
- Soft-Start
- Internal Compensation
- CTRL Pin Allows Output Adjustment with No Polarity Inversion
- 3mm × 3mm 16-Lead QFN Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 features high side APD bias current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated power switch, Schottky diodes and APD bias current monitor allow a small converter footprint and low solution cost. Constant switching frequency results in predictable output noise that is easy to filter. The inductor-based topology ensures an input free from switching noise. An integrated high side current monitor produces a current proportional to APD bias current with better than 10% relative accuracy over four decades of dynamic range in the input range of 250nA to 2.5mA. This APD bias current can be used as a reference to provide a digitally programmed output voltage via the CTRL pin. The LT3482 is available in the tiny footprint (3mm × 3mm) 16-lead QFN package.Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT3482EUD#PBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LT3482EUD#TRPBF | 3x3 QFN-16 | UD | E | 05-08-1691 | Yes |
| LT3482IUD#PBF | 3x3 QFN-16 | UD | I | 05-08-1691 | Yes |
| LT3482IUD#TRPBF | 3x3 QFN-16 | UD | I | 05-08-1691 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3482EUD#PBF | 3x3 QFN-16 | E | $4.93 | $3.45 | Yes | |
| LT3482EUD#TRPBF | 3x3 QFN-16 | E | $3.51 | Yes | ||
| LT3482IUD#PBF | 3x3 QFN-16 | I | $5.91 | $4.14 | Yes | |
| LT3482IUD#TRPBF | 3x3 QFN-16 | I | $4.20 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC975A | LT3482EUD Demo Board | 3V ≤ VIN ≤ 12V, Vout = 80V @ 2mA | $125.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3482IUD#PBF | 3x3 QFN-16 | I | $5.91 | $4.14 | Yes | |
| LT3482IUD#TRPBF | 3x3 QFN-16 | I | $4.20 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- APD Bias
- PIN Diode Bias
- Optical Receivers and Modules
- Fiber Optic Network Equipment
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Design Tools
LTspice
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LT3482
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
