DocumentationDatasheet
Design Note
Reliability Data
Press Release
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Features
- Wide Input Voltage Range: 2.5V to 24V
- 3A, 42V Internal Switch
- High Efficiency Power Conversion: Up to 89%
- Soft-Start
- Frequency Set by External Resistor: 200kHz to 3.5MHz
- Protection Against Input Short Circuits and Hot Plugging
- Low VCESAT Switch: 0.3V at 2.5A (Typical)
- Capable of Positive and Negative Outputs
- Available in Thermally Enhanced 14-Lead (4mm × 3mm) DFN and 16-Lead TSSOP Packages
Typical Application
Description
The LT3479 is a current mode, fixed frequency step-up DC/DC converter with an internal 3A, 42V switch. Efficiencies of up to 89% can be achieved in typical applications. It features a programmable soft-start function to limit inductor current during start-up and inrush current protection to protect the LT3479 during shorts and line transients. Both inputs of the error amplifier are available to the user allowing positive and negative output voltages. Through an external resistor, the user can program the switching frequency from 200kHz to 3.5MHz. The low profile (0.75mm) 14-pin, 4mm × 3mm DFN package provides excellent thermal performance in a small footprint. The LT3479 is also available in a thermally enhanced 16-pin TSSOP package.
4x3 DFN-14,TSSOP-16
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT3479EDE#PBF | DFN | 12 | E | $3.56 | $3.00 |
| LT3479EDE#TRPBF | DFN | 12 | E | $3.12 | |
| LT3479EFE#PBF | TSSOP | 16 | E | $3.56 | $3.00 |
| LT3479EFE#TRPBF | TSSOP | 16 | E | $3.12 | |
| LT3479EFE | TSSOP | 16 | E | $7.12 | $6.00 |
| LT3479EFE#TR | TSSOP | 16 | E | $6.24 | |
| LT3479EDE | DFN | 12 | E | $7.12 | $6.00 |
| LT3479EDE#TR | DFN | 12 | E | $6.24 |
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 |
|---|---|---|---|
| DC765B | LT3479EDE Demo Board | Positive/ Negative Converter (LT3479 x2), Boost: 2.5V ≤ VIN ≤ 4.2V, Vout=7V@600mA, Inverter: 2.5V ≤ VIN ≤ 12V, Vout=-5V@600mA | $175.00 | |
| DC843A | LT3479EDE/ High Current Boost LED Driver, Vin = 2.7V-4.5V | $100.00 |