The LT3593EDC is a step-up DC/DC converter designed to drive up to ten white LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents and eliminates the need for ballast resistors. The device features a unique high side LED current sense that enables the part to function as a “one wire current source” where the low side of the LED string can be returned to ground anywhere.
Additional features include output disconnect in shutdown, open LED protection and 1-pin shutdown/LED current control. The CTRL pin is toggled to adjust the LED current via an internal counter and a 5-bit DAC.
The LT3593EDC switches at 1MHz, allowing the use of tiny external components. Constant frequency switching results in low input noise and a small output capacitor. The LT3593EDC is available in the 6-lead DFN (2mm × 2mm) as well as the 6-lead SOT-23 packages.
Feature
- Drives Up to Ten White LEDs from a 3V Supply
- One Pin Shutdown and Current Programming
- LEDs Disconnected in Shutdown
- 32:1 Linear Brightness Control Range
- VIN Range: 2.7V to 5.5V
- ±5% Output Current Accuracy at Full Scale
- Low Shutdown Current: 3μA
- 1MHz Switching Frequency
- Requires Only 1μF Output Capacitor
- Low Profile 6-Lead DFN (2mm × 2mm × 0.75mm) and 6-Lead SOT-23 Packages
Applications
- Cell Phones
- Digital Cameras
- PDAs, Handheld Computers
- MP3 Players
- GPS Receivers
(Picture: Pinout)
