The YB1521 is a high power step-up DC-DC converter and WLED driver from Yobon that operates as a current source to drive up to 45 white LEDs (3S15P) in parallel / series configuration from a 5V system rail. The YB1521 is a fixed frequency of 1.3MHz, allowing the use of tiny low profile inductors and capacitors to minimize footprint and cost in space consideration applications for cellular phone backlighting or other hand held equipment.
The Yobon YB1521 is a high power step-up DC-DC converter and WLED driver featuring a built-in power MOSFET. It operates as a current source to drive up to 45 white LEDs in parallel or series configuration from a 5V system rail, with an input voltage range of 2.5V to 5.5V. The device achieves up to 94% efficiency and includes features such as over-voltage protection, thermal shutdown, and internal soft start.
| Input Voltage Range | 2.5V to 5.5V |
|---|---|
| Output Voltage | Up to 15V |
| Output Current | Up to 400mA |
| Switch Current Limit | 1.6A |
| Feedback Voltage | 200mV |
| Operating Temperature | -40°C to 85°C |
| Package Type | SOT23-5 |
The YB1521 can drive up to 45 white LEDs in parallel or series configuration.
The shutdown current is less than 1uA.
A 6.8uH inductor is recommended to drive 39 LEDs in series/parallel.