Linear's LT3593 is a step-down DC/DC converter that can drive up to 10 white LEDs in series with a single 3V lithium battery and has a linear brightness control range of .32:1 for a wide range of applications in mobile phones, digital cameras. , PDA, laptop, MP3 player and GPS receiver. This article describes the main performance of the LT3593, the block diagram and the application circuit diagram to drive different numbers of LEDs.
The LT3593 is a step-up DC/DC converter designed to drive up to ten white LEDs in series from a Li-Ion cell.
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 components. Constant frequency switching results in low input noise and a small output capacitor. The LT3593 is available in the 6-lead DFN (2mmXï€ 2mm) as well as the 6-lead SOT-23 packages.
Main features:
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 Profi le 6-Lead DFN (2mmXï€ 2mmXï€ 0.75mm) and 6-Lead SOT-23 Packages
application:
Cell Phones
Digital Cameras
PDAs, Handheld Computers
MP3 Players
GPS Receivers
Figure 1. Block diagram of the LT3593
Figure 2. Lithium battery driving 10 white LED circuit diagrams
Figure 3. Two AA batteries drive three white LED circuit diagrams
Figure 4. Lithium battery driving a single white LED circuit diagram
Figure 5. Lithium battery driving two white LED circuit diagrams
Figure 6. Three white LED circuit diagrams driven by a lithium battery
Figure 7. Lithium battery driver 4 white LED circuit diagram
Figure 8. Lithium battery driver 6 white LED circuit diagram
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