The ADD5205 is a current‑mode step‑up LED driver designed for backlight applications. It provides four regulated constant‑current sources, each capable of delivering up to 25 mA, and supports PWM dimming for brightness control. The device operates from 2.8 V to 18 V input voltage and includes safety features such as soft‑start, open‑load protection, undervoltage lockout, and thermal shutdown.
The datasheet details the functional block diagram, pin configuration, electrical specifications, and typical application circuits. It also outlines layout guidelines, thermal resistance, and ordering information for the 12‑lead LFCSP package.
| Input Voltage Range | 2.8 V – 18 V |
|---|---|
| Switch Current Limit (RDS(on)) | 0.3 Ω |
| Adjustable LED Current per Channel | up to 25 mA |
| Overvoltage Protection | 28 V |
| Thermal Shutdown Threshold | 160 °C |
| UVLO Rising Threshold | 2.5 V |
Each channel can drive up to 25 mA, set by an external resistor on the ISET pin.
Brightness is controlled via a PWM input; the duty cycle is converted to an analog level that adjusts the LED current.