LT3591 Linear Technology Integrated Circuit (Small Outline No-lead) In Stock
The Linear Technology LT3591 is a fixed-frequency boost converter white LED driver with an integrated Schottky diode in a compact 3 mm × 2 mm DFN package, designed for backlighting and illumination applications. It drives strings of series-connected white LEDs with accurate current regulation and supports both PWM and analog dimming for precise brightness control over a wide dimming ratio. Available through global distributors, the LT3591 is a trusted solution for display backlighting in portable electronics, industrial panels, and consumer devices.
- Manufacturer
- Linear Technology
- Package
- Small Outline No-lead
- Pin Count
- 9
- Lifecycle
- ACTIVE
- Datasheet
- LT3591 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Integrated Schottky diode eliminates an external catch diode, reducing BOM component count and PCB area in LED driver designs
- Boost converter topology drives multiple series-connected white LEDs from input voltages as low as 2.7 V, covering single-cell Li-ion rails
- Compact 3 mm × 2 mm DFN package with exposed thermal pad enables high-density LED driver layout in space-limited portable applications
- PWM and analog dimming inputs allow precise brightness control over a wide dimming ratio for display backlight and illumination designs
Applications
The LT3591 is designed for LCD backlight drivers, keypad illumination, and decorative LED lighting in portable electronics, tablet computers, and industrial HMI panels where accurate current regulation and small size are critical. Its integrated Schottky diode and compact DFN package simplify implementation of a complete multi-LED string driver with minimal external components and a minimal PCB footprint. Engineers also deploy the LT3591 for status indicator arrays and general-purpose white LED lighting in battery-powered embedded systems requiring wide-range dimming capability.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What LED string configurations can the LT3591 drive, and what is its input voltage range?
The LT3591 drives strings of series-connected white LEDs using a boost converter topology, accepting input voltages as low as 2.7 V to support single-cell lithium-ion batteries and 3.3 V regulated rails. The integrated Schottky diode allows the output to exceed the input without an external catch component, sustaining LED string voltages across multiple series-connected LEDs without additional external circuitry.
For which display and lighting applications is the LT3591 boost LED driver most commonly selected?
The LT3591 is commonly selected for LCD backlighting in smartphones, portable navigation devices, tablet computers, and industrial HMI panels where compact size and accurate LED current regulation are required. Its PWM and analog dimming support enables smooth brightness adjustment across a wide dimming ratio from a 2.7 V to 16 V input supply, covering both battery-powered and regulated system applications.
How does integrating the Schottky diode inside the LT3591 benefit overall LED driver circuit design?
Including the Schottky diode within the 3 mm × 2 mm DFN eliminates one external component, reducing BOM cost and freeing PCB area that a separately mounted diode would consume. At the 1 MHz typical switching frequency, the integrated diode is optimized for the converter's switching characteristics, ensuring lower forward recovery losses and improved conversion efficiency compared to a generic external Schottky placed on the PCB.
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