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ADP5520 Dataheets PDF



Part Number ADP5520
Manufacturers Analog Devices
Logo Analog Devices
Description Backlight Driver
Datasheet ADP5520 DatasheetADP5520 Datasheet (PDF)

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 LE.

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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 number of lines required to interface with the baseband processor across the hinge flex. TYPICAL OPERATING CIRCUIT VBAT 1µF I/O RAIL 1µF 4.7µH 2 1 PGND SW 21 VBAT 22 BST 23 BL_SNK CAP_OUT 20 16 VDDIO 5 SCL ADP5520 4 SDA 3 INT 15 RST R3 R2 R1 R0 C0 C1 C2 C3 13 6 7 8 9 10 11 12 GND 19 GND 18 GND 24 CMP_IN 17 ILED 14 1µF 100nF VBAT A BC D E FGH VBAT Figure 1. The ADP5520 can detect ambient light levels and adjust the backlight brightness accordingly, resulting in extended battery operation. Once configured, the ADP5520 is capable of controlling the flip/slider backlight intensity, on/off timing, dimming, and fading without the intervention of the main processor, which results in valuable battery power saving. Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2008–2017 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADP5520 TABLE OF CONTENTS Features .......................................


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