Backlight Driver
10kΩ 10kΩ 2.2kΩ 2.2kΩ I/O I/O
07445-001
Data Sheet
Backlight Driver with I/O Expander ADP5520
FEATURES
Efficient asyn...
Description
10kΩ 10kΩ 2.2kΩ 2.2kΩ I/O I/O
07445-001
Data Sheet
Backlight Driver with I/O Expander ADP5520
FEATURES
Efficient asynchronous boost converter for driving up to 6 white LEDs
2.7 V to 5.5 V input voltage range 128 programmable backlight LED current levels (30 mA
maximum) Ambient light sensing with autonomous backlight
adjustment Programmable backlight fade-in/fade-out times Programmable backlight dim and off times 8 configurable GPIO pins (input, output, up to 4 × 4 keypad) Up to 3 auxiliary LED current sinks (1 dedicated, 2 configurable) 64 programmable auxiliary LED current levels (14 mA
maximum) 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 (INT) Hard reset (RST) Current limit protection Thermal overload protection Available in small 4.0 mm × 4.0 mm, 24-lead LFCSP package
APPLICATIONS
Display backlight driver for phones that require slider or flip keypad functions with single or multiple LED indicators
GENERAL DESCRIPTION
The ADP5520 is a versatile single-chip, white LED backlight driver with a user configurable I/O expander. This device fits handset applications where the flip or slider section of the phone requires backlighting, I/O signaling and detecting, auxiliary LED lighting, and keypad functions. By incorporating an I2Ccompatible serial interface and a single line interrupt, the ADP5520 significantly reduces the total...
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