The LM3530 current mode boost converter supplies the power and controls the current in up to 11 series white LEDs. The 839-mA current limit and 2.7-V to 5.5-V input voltage range make the device a versatile backlight power source ideal for operation in portable applications.
The LED current is adjustable from 0 mA to 29.5 mA via an I2C-compatible interface. The 127 different current steps and 8 different maximum LED current levels give over 1000 programmable LED current levels. Additionally, PWM brightness control is possible through an external logic level input.
The device also features two Ambient Light Sensor inputs. These are designed to monitor analog output ambient light sensors and provide programmable adjustment of the LED current with changes in ambient light. Each ambient light sensor input has independently programmable internal voltage setting resistors which can be made high impedance to reduce power during shutdown. The 500-kHz switching frequency allows for high converter efficiency over a wide output voltage range accommodating from 2 to 11 series LEDs. Finally, the support of Content Adjusted Backlighting maximizes battery life while maintaining display image quality.
The LM3530 operates over the −40°C to 85°C temperature range.
| Typ | Titel | Datum | ||
|---|---|---|---|---|
| * | Data sheet | LM3530 High-Efficiency White-LED Driver with Programmable Ambient Light Sensing Capability and I2C-Compatible Interface datasheet (Rev. L) | PDF | HTML | 23 Dez 2014 |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 Sep 2020 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | Analog PWM Dimming in White-LED Drivers | 21 Dez 2016 | ||
| Application note | Inductor Selection in Boost Converters for LCD Backlight Applications | 24 Okt 2016 | ||
| Application note | Schottky Diode Selection in Asynchronous Boost Converters | 06 Sep 2016 | ||
| User guide | AN-1991 LM3530 Evaluation Kit (Rev. A) | 30 Apr 2013 |
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Available in Linux Main line: Yes
Available through git.ti.com: N/A
The files (...)
| Gehäuse | Pins | CAD-Symbole, Footprints und 3D-Modelle |
|---|---|---|
| DSBGA (YFQ) | 12 | Ultra Librarian |
| DSBGA (YFZ) | 12 | Ultra Librarian |
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