This file is about ADM8843, a 4-LED white LED backlight driver that uses charge pump technology. It has a maximum input voltage of 5.5V, a typical LED current matching of 0.3%, and supports 88% power efficiency. It has low power consumption and can be individually shut down on the main and sub display LEDs. This product is suitable for use in mobile phones, cameras, micro TFT color displays, and DSC PDAs.
The ADM8843 LED backlight driver from Analog Devices powers up to four white LEDs for LCD backlighting in devices such as cellular phones and camera flashes. It operates from a 2.6 V to 5.5 V supply and offers 1×, 1.5× and 2× charge‑pump modes to maximize power efficiency, achieving up to 88 % over the Li‑ion range. Individual shutdown control and PWM dimming are provided via the CTRL1 and CTRL2 digital inputs.
Key features include 0.3 % typical LED current matching, low‑power shutdown mode, soft‑start limiting in‑rush current, and a compact 3 mm × 3 mm LFCSP package. The datasheet provides detailed specifications, pin configurations, absolute maximum ratings, thermal characteristics, and typical performance curves.
| Input Voltage (VEE) | 2.6 V to 5.5 V |
|---|---|
| Supply Current (all LEDs disabled) | 2.6 mA |
| LED Current | 20 mA |
| Charge Pump Frequency | 15 MHz |
| Power Efficiency (typical) | up to 88 % |
| Shutdown Current | 5 µA |
| Operating Temperature Range | ‑40 °C to +85 °C |
The device operates from 2.6 V to 5.5 V input voltage.
Typical LED current matching accuracy is 0.3 %.
The driver can achieve up to 88 % power efficiency over the Li‑ion voltage range.
Yes, the CTRL1 and CTRL2 pins control shutdown of the main and sub display LEDs independently.