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Charge Pump Driven 9-Channel LED Driver with Automated LED Lighting Effects
Preliminary Technical Data
FEATURES
Charge pump with automatic gain selection of 1x, 1.5x, and 2x for maximum efficiency. 92% peak efficiency 9 independent and programmable LED drivers Each driver capable of 25 mA (full scale) Each driver has 7 bits (128 levels) of non-linear current settings Standby mode for <1 A current consumption 16 programmable fade in and fade out times (0.0 sec to 1.75 sec) with choice of square or cubic rates Automated and customizable LED blinking for all 9 channels. Unique heartbeat mode for customizable double pulse lighting effects PWM input for implementing content adjustable brightness control (CABC) I2C compatible interface for all programming Dedicated reset pin and built-in power on reset (POR) Short circuit, overvoltage, and overtemperature protection Internal soft start to limit inrush currents Input to output isolation during faults or shutdown Operates down to VIN = 2.5 V, with undervoltage lockout (UVLO) at 2.0 V Small lead frame chip scale package (LFCSP)
ADP8866
APPLICATIONS
Mobile display backlighting Mobile phone keypad backlighting LED indication and status lights Automated LED blinking
TYPICAL OPERATING CIRCUIT
Figure 1.
GENERAL DESCRIPTION
The ADP8866 combines a programmable backlight LED charge pump driver with automatic blinking functions. Nine LED drivers can be independently programmed at currents up to 25 mA. The current level, fade time, and blinking rate can be programmed once and executed autonomously on a loop. Separate fade in and out times can be set for the backlight LEDs. Driving all of this is a two capacitor charge pump with gains of 1x, 1.5x, and 2x. This setup is capable of driving a maximum IOUT of 240 mA from a supply of 2.5 V to 5.5 V. A full suite of safety features including short-circuit, overvoltage, and overtemperature protection allow easy implementation of a safe and robust design. Additionally, input inrush currents are limited via an integrated soft start combined with controlled input to output isolation.
Rev. PrA
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. www.analog.com Tel: 781.329.4700 Fax: 781.461.3113 (c)2010 Analog Devices, Inc. All rights reserved.
ADP8866 OUTLINE DIMENSIONS
PIN 1 INDICATOR 4.10 4.00 SQ 3.90 0.50 BSC 0.30 0.25 0.20
16 15 EXPOSED PAD 20 1
Preliminary Technical Data
PIN 1 INDICATOR
2.65 2.50 SQ 2.35
5 6
11
TOP VIEW 0.80 0.75 0.70 SEATING PLANE
0.50 0.40 0.30
10
0.25 MIN
BOTTOM VIEW FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET.
0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 REF
COMPLIANT TO JEDEC STANDARDS MO-220-WGGD.
Figure 2. 20 Lead Lead Frame Chip Scale Package [LFCSP_WQ] 4 mm x 4 mm Body, Very Very Thin Quad (CP-20-10) Dimensions shown in millimeters
ORDERING GUIDE
Model 1 ADP8866ACPZ-R7
1
Temperature Range -40C to +105C
Package Description 20-Lead LFCSP_WQ, Tape and Reel
061609-B
Package Option CP-20-10
Z = RoHS Compliant Part.
Figure 3. Tape and Reel Orientation for LFCSP Units
(c)2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR09478-0-12/10(PrA)
Rev. PrA | Page 2 of 2
07967-031

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