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Reliability Data
Press Release
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Features
- 5000:1 True Color PWM™ Dimming Ratio
- 1.5A, 45V Internal Switch
- 100mV High Side Current Sense
- Open LED Protection
- Adjustable Frequency: 250kHz to 2.5MHz
- Wide Input Voltage Range:
Operation from 3V to 30V
Transient Protection to 40V - Operates in Boost, Buck Mode and Buck-Boost Mode
- Gate Driver for PMOS LED Disconnect
- Constant-Current and Constant-Voltage Regulation
- CTRL Pin Provides 10:1 Analog Dimming
- Low Shutdown Current: <1μA
- Available in (4mm × 4mm) 16-Lead QFN and 16-Pin TSSOP Packages
Typical Application
Description
The LT3517 is a current mode DC/DC converter with an internal 1.5A, 45V switch specifically designed to drive LEDs. The LT3517 operates as a LED driver in boost, buck mode and buck-boost mode. It combines a traditional voltage loop and a unique current loop to operate as a constant-current source or constant-voltage source. Programmable switching frequency allows optimization of the external components for efficiency or component size. The switching frequency of LT3517 can be synchronized to an external clock signal. The LED current is externally programmable with a 100mV sense resistor. The external PWM input provides up to 5000:1 LED dimming. The CTRL pin provides further 10:1 dimming ratio.
The LT3517 is available in the tiny footprint 16-lead QFN (4mm × 4mm) and the 16-pin TSSOP packages. The LT3517 provides a complete solution for both constant-voltage and constant-current applications.
4x4 QFN-16,TSSOP-16
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT3517EFE#PBF | TSSOP | 16 | E | $4.07 | $2.85 |
| LT3517EFE#TRPBF | TSSOP | 16 | E | $2.91 | |
| LT3517EUF#PBF | QFN | 16 | E | $3.86 | $2.70 |
| LT3517EUF#TRPBF | QFN | 16 | E | $2.76 | |
| LT3517HFE#PBF | TSSOP | 16 | H | $5.24 | $3.67 |
| LT3517HFE#TRPBF | TSSOP | 16 | H | $3.73 | |
| LT3517HUF#PBF | QFN | 16 | H | $4.99 | $3.49 |
| LT3517HUF#TRPBF | QFN | 16 | H | $3.55 | |
| LT3517IFE#PBF | TSSOP | 16 | I | $4.89 | $3.42 |
| LT3517IFE#TRPBF | TSSOP | 16 | I | $3.48 | |
| LT3517IUF#PBF | QFN | 16 | I | $4.63 | $3.24 |
| LT3517IUF#TRPBF | QFN | 16 | I | $3.30 | |
| LT3517EFE | TSSOP | 16 | E | $8.14 | $5.70 |
| LT3517IFE | TSSOP | 16 | I | $9.78 | $6.84 |
| LT3517HFE | TSSOP | 16 | H | $10.48 | $7.34 |
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 |
|---|---|---|---|
| DC1279A | LT3517EUF | Boost LED Driver, 3V ≤ PVIN ≤ 40V, VLED up to 40V @ 330mA | $100.00 |