AAT2428 - Skyworks Solutions, Inc.

PRODUCT SUMMARY
AAT2428
Sixteen-Channel White LED Driver Solution with LED Current and Timing Control
General Description
Features
The AAT2428 is a highly integrated, high efficiency white
LED backlight solution for large size LCD panels used in
LCD TVs. Integrated precision current sinks provide drive
for up to 16 LED channels. The IC has user programmable options for current sinks to be controlled globally,
in banks of 2, or 4 LED groups. A wide range of series
LEDs is possible because the current sinks can withstand
up to 50V.
•VIN Range: 10.8V – 28V
• 16 Programmable LED Current Sinks
▪▪ ±1.5% Accuracy @ 25°C (101.72mA)
▪▪ ±2.0% Matching @ 25°C (101.72mA)
• SPI Interface
▪▪ Digitally Programmable LED Channels
▪▪ LED Bank Control Options
-- 1 (all 16 channels)
-- 2 (2 x 8 Channels)
-- 4 (4 x 4 Channels)
▪▪ Up to 15MHz Clock Speed
▪▪ Read/Write Registers
• High Resolution Digital Control of LED Banks
▪▪ 12-Bit Resolution Grayscale PWM Brightness
▪▪ 12-Bit Resolution Channel Phase Delay
▪▪ 8-Bit Resolution Current Setting (Dot Correction)
• VSYNC PWM and Delay Synchronization
• VSYNC range of up to 1kHz
• External or Internal Grayscale Clock
• 16 Unique Device Addresses
▪▪ Up to 256 Current Sinks
• Integrated Fault Protection
▪▪ Open Circuit LED(s)
▪▪ Programmable Shorted-LED Threshold
▪▪ Current Limit Protection
▪▪ Over-Temperature Protection
• Soft-Start to Minimize Inrush Current
• 7mm x 7mm 48 pin TQFN Package
A SPI compatible interface operates up to 15MHz, allowing fast, independent digital control of each current sink.
16 unique device addresses allow for control of up to 128
LED strings. Full scale LED current is programmed from
40mA to 150mA using an external resistor. LED brightness variation is compensated by setting relative current
sink magnitudes with an 8-bit resolution dot correction
register for each LED current sink. LED dimming and
phase delay are programmable with 12-bit resolution
though the SPI bus interface. Both the 12-bit resolution
grayscale PWM brightness setting and phase delay are
generated from an external VSYNC signal and an external or internally generated GSCLK signal.
The AAT2428 provides fault handling and fault reporting
through the SPI interface. Reported fault conditions
include over-temperature, open LED detection and short
circuit LED detection. The threshold for short circuit LED
detection is programmable. All fault conditions are
reported on the open drain FAULT output pin.
The LED supply voltage may be regulated using a current
sense feedback function that provides both voltage and
current mode feedback. This analog feedback signal represents the highest VF string of LEDs. A current sense
feedback input signal allows for cascading any number of
AAT2428s.
The AAT2428 is available in Pb-free, thermally enhanced
48-pin 7mm x 7mm TQFN package.
Applications
• Large Size LCD TVs, Panels
• Large Tile Direct LED Backlight
• LCD Monitors
• LED Backlighting Applications
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202190A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 18, 2012
1
PRODUCT SUMMARY
AAT2428
Sixteen-Channel White LED Driver Solution with LED Current and Timing Control
Ordering Information
Package
Marking
Part Number2 (Tape and Reel)
TQFN77-48
S3XYY
AAT2428ISZ-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Package Information
Pin 1 Identification
Chamfer 0.300 x 45°
5.300 ± 0.050 Exp. DAP
0.230 ± 0.050
7.000 ± 0.050
Pin 1 Dot
by Marking
5.300 ± 0.050 Exp. DAP
0.500 BSC
0.400 ± 0.050
TQFN77-48L3
5.500 REF
7.000 ± 0.050
Bottom View
Top View
0.750 ± 0.050
+ 0.100
0.000
- 0.000
0.203 REF
Side View
All dimensions in millimeters.
1. XYY = Assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3.The leadless package family, which includes QFN, TQFN, DFN, TDFN, and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
2
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202190A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 18, 2012
PRODUCT SUMMARY
AAT2428
Sixteen-Channel White LED Driver Solution with LED Current and Timing Control
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR
PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES
NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM
THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202190A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 18, 2012
3