LT3593 Datasheet | Linear Technology

.. LT3593 1MHz White LED Driver with Output Disconnect and One Pin Current Programming DESCRIPTION The LT®3593 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 LT3593 switches at 1MHz, allowing the use of tiny external ponents. Constant frequency switching results in low input noise and a small output capacitor. The LT3593 is available in the 6-lead DFN (2mm × 2mm) as well as the 6-lead SOT-23 packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Features n n n n n n n n n n 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 n n n n n Cell Phones Digital Cameras PDAs, Handheld puters MP3 Players GPS Receivers TYPICAL APPLICATION Li-Ion Driver for Ten White LEDs VIN 3V TO 5V 10μH 1μF VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND LED 1μF EFFI CIENCY (%) 90 80 70 60 50 40 30 Conversion Efficiency VIN = 3.6V 10 LEDs 10 15 LED CURRENT (m A) 3593 TA01b 3593...