ADP5520 is a backlight driver with I/O expansion from Analog Devices. It adopts an efficient asynchronous boost converter to drive up to 6 white LEDs. The input voltage range is 2.7 V to 5.5 V, and it can be programmed with 128 levels of backlight LED current (up to 30 mA). It also features ambient light sensing with autonomous backlight adjustment, programmable backlight fade-in/fade-out times, programmable backlight dim and off times. In addition, it has 8 configurable GPIO pins (input, output, up to 4x4 keypad), up to 3 auxiliary LED current sinks (1 dedicated, 2 configurable), 64 programmable auxiliary LED current levels (up to 14 mA), programmable auxiliary LED fade-in/fade-out times, programmable auxiliary LED on and off times (allows blinking), I2C-compatible serial interface, interrupt line for signaling an external processor (nINT), and hard reset (nRST). It also has current limit protection and thermal overload protection. The product is available in a small package and can be widely used in portable devices, laptops, desktops, TVs, and other electronic devices.
The ADP5520 is a versatile single‑chip white LED backlight driver with an integrated I/O expander, ambient‑light sensor, and programmable LED current levels. It is designed for handset applications that require backlight control, keypad functions, and auxiliary LEDs while minimizing the number of processor interface lines.
The document provides a complete description of the device, including functional features, electrical specifications, timing diagrams, pin configurations, typical performance curves, and application guidelines such as PCB layout and boost operation. It also lists absolute maximum ratings, thermal shutdown parameters, and ESD precautions.
| Full‑Scale Backlight Current | 30 mA (typical, up to 32 mA) |
|---|---|
| Peak Inductor Current Limit | 450 mA to 750 mA |
| Thermal Shutdown Threshold (rising) | 150 °C |
It provides 128 programmable backlight LED current levels, up to 30 mA maximum.
Yes, it features an ambient‑light sensor with autonomous backlight adjustment.
The device includes current‑limit protection and thermal‑overload protection.