The SP7618 is a constant current LED driver from Sipex Corporation. It features a low dropout voltage, high accuracy and high reliability. The chip uses a linear circuit to output 1A of constant current, and has an internal thermal protection function to automatically shut down the output when the LED overheats.
The SP7618 is a linear low‑side constant‑current driver designed to drive high‑power LEDs from an input voltage rail. It offers very low dropout voltage, adjustable output current up to 1.033 A in 33.33 mA steps, fast turn‑on, and built‑in thermal and timeout protection.
Typical applications include mobile phones, PDAs, MP3 players, handheld computers, LCD display modules, and keyboard backlights. The datasheet also details recommended PCB layout with a ground plane, bypass capacitors near pins 3‑6, and proper grounding of the LED pins for optimal performance.
| Quiescent Current | 350 – 420 pA |
|---|---|
| Thermal Shutdown Temperature | 160 °C |
| Timeout Duration | 4 seconds (over 266 mA) |
| DAC Step Size | 33.33 mA per pulse |
| Package | 8‑pin DFN (2 mm × 3 mm) |
LED current is set by sending pulses to the CTRL pin; each pulse adds 33.33 mA, up to 31 steps for a maximum of 1033 mA.