AAT3128 SKYWORKS

Document overview

  • Manufacturer or author: Provided By www.digicamel.com(free datasheet download site)
  • PDF pages: 13

Technical content

Features

  • 2.7V to 5.5V Input Voltage Range
  • Compatible with Common Anode RGB LEDs
  • Four S2Cwire Controlled Lighting Moods
  • 0~60mA Programmable Current Source
  • Low Noise Constant Frequency Operation
  • No Inductors
  • Small Application Circuit
  • Regulated Output Current
  • Integrated LED Control Switches
  • Automatic Soft-Start
  • Less than 1µA Shutdown Current

Applications

  • Color Backlighting for Monochrome LCD Displays
  • Color Display Lighting
  • Fashion Lighting RGB LEDs
  • Mobile Handsets
  • MP3 Players
  • PDAs
  • Smartphones Typical Application GR B CIN 1µF RSET 38.3kΩ COUT 1µF 1µF 1µF VBATTERY EN/SET IN CP C1+ C1- C2+ C2- DR DG DB EN/SET GND AAT3128 RGB LED 1 ISRC2 ISRC1 GR B RGB LED 2 RSET + -

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012 Pin Descriptions Pin # Symbol Function 1 RSET Current Setting Resistor. Connect a resistor from RSET to GND to program the maximum LED current 2 DG Green LED On/Off Switch. DG turns on/off the green LED. Connect the green LED cathode to DG. 3 DR Red LED On/Off Switch. DR turns on/off the red LED. Connect the red LED cathode to DR. 4 DB Blue LED On/Off Switch. DB turns on/off the blue LED. Connect the blue LED cathode to DB. 5 GND Ground. 6 IN Power Input. Connect the input power voltage source to IN. Connect a 1μF ceramic capacitor from IN to GND. 7 C2- Flying Capacitor 2 Negative Node. Connect a 1μF ceramic capacitor between C2+ and C2-. 8 C2+ Flying Capacitor 2 Positive Node. Connect a 1μF ceramic capacitor between C2+ and C2-. 9 C1- Flying Capacitor 1 Negative Node. Connect a 1μF ceramic capacitor between C1+ and C1-. 10 C1+ Flying Capacitor 1 Positive Node. Connect a 1μF ceramic capacitor between C1+ and C1-. 11 CP Charge Pump Output. CP is the output voltage stage of the internal charge pump. Bypass CP to GND with a 1μF ceramic capacitor. 12 ISRC1 LED Current Source 1. ISRC1 controls the current through the LEDs connected to it. Connect the RGB LED anode or LED array anodes to ISRC1. 13 ISRC2 LED Current Source 2. ISRC2 controls the current through the LEDs connected to it. Connect the RGB LED anode or LED array anodes to ISRC2. 14 EN/SET Enable/Set Input. ENSET turns on/off the AAT3128 and is the S2Cwire serial interface input to control the LED color and brightness mood function. This node uses active high logic. Pin Configuration TSOPJW-14 (Top View) RSET DG DR DB GND IN EN/SET ISRC2 ISRC1 CP C1+ C1- 7 8C2- C2+

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012 Absolute Maximum Ratings1 Symbol Description Value Units VIN, VCP IN, CP to GND -0.3 to 6 V VC1+, VC1-, VC2+, VC2- C1+, C1-, C2+, C2- to GND -0.3 to VCP + 0.3 V VEN/SET, VRSET, VISRC1, VISRC2, VDG, VDR, VDB EN/SET, RSET, ISRC1, ISRC2, DG, DR, DB to GND -0.3 to VIN + 0.3 V TJ Operating Junction Temperature Range -40 to 150 °C TLEAD Maximum Soldering Temperature (at leads, 10 sec) 300 °C Thermal Characteristics2 Symbol Description Value Units qJA Maximum Thermal Resistance 160 °C/W PD Maximum Power Dissipation 625 mW 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on a FR4 board.

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012

Electrical Characteristics

VIN = 3.6V, CIN = COUT = C1 = C2 = 1.0µF; TA = -40 to +85˚C. Unless otherwise noted, typical values are TA = 25˚C. Symbol Description Conditions Min Typ Max Units Input Power Supply VIN Input Operation Range 2.7 5.5 V ICC Operating Current 3.0 ≤ VIN ≤ 5.5, CP = 1.5x, No Load Current 3 7 mA ISHDN Shutdown Current EN = 0 10 µA ISRC Output Current Accuracy 3.0 ≤ VIN ≤ 5.5 -5 5 % h Efficiency VIN = 3.5 93 % Charge Pump TSS Soft-Start Time 200 µs FCLK Clock Frequency 1 MHz h Efficiency VIN = 3.5 93 % Switches RDS(ON) Switch On Resistance VIN = 3.5, TA = 25°C 2 W EN/SET VEN(L) Enable Threshold Low 0.4 V VEN(H) Enable Threshold High 1.4 V TEN/SET LO EN/SET Low Time VEN/SET < 0.6V 0.3 75 µs TEN/SET HI Minimum EN/SET High Time VEN/SET > 1.4V 50 ns TOFF EN/SET Off Timeout VEN/SET < 0.6V 500 µs TLAT EN/SET Latch Timeout VEN/SET > 1.4V 500 µs IEN/SET EN/SET Input Leakage VEN/SET = 5V -1 1 µA 1. The AAT3128 is guaranteed to meet performance specification over the –40 to +85°C operating temperature range, and are assured by design, characterization and correlation with statistical process controls.

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012 Typical Characteristics Current Source Output vs. Input Voltage Input Voltage (V) ISRC1 Current (mA) -40°C 25°C 85°C -40°C 25°C 85°C Shutdown Current vs. Input Voltage Input Voltage (V) Shutdown Current (µA) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 85°C 25°C -40°C Enable Input High Threshold vs. Input Voltage Input Voltage (V) VIH (V) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 -40°C 25°C 85°C Enable Input Low Threshold vs. Input Voltage Input Voltage (V) VIL (V) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 -40°C 25°C 85°C EN/SET Turn-Off Time vs. Input Voltage Input Voltage (V) TOFF (µs) 100 150 200 250 300 350 400 -40°C 25°C 85°C S2Cwire Latch Enable Time vs. Input Voltage Input Voltage (V) TLAT (µs) 100 150 200 250 300 350 400 -40°C 25°C 85°C

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012 Typical Characteristics Input vs. Output Transient (VIN = 2.7V; Data 1) Time (500µs/div) VIN (200mV/div) VISRC1 (2V/div) IIN (200mA/div) Input vs. Output Transient (VIN = 2.7V; Data 5) Time (500µs/div) VIN (200mV/div) VISRC1 (2V/div) IIN (200mA/div) Input vs. Output Transient (VIN = 3.6V; Data 1) Time (500µs/div) VIN (200mV/div) VISRC1 (2V/div) IIN (200mA/div) Input vs. Output Transient (VIN = 3.6V; Data 5) Time (500µs/div) VIN (200mV/div) VISRC1 (2V/div) IIN (200mA/div) Input vs. Output Transient (VIN = 4.2V; Data 1) Time (500µs/div) VIN (200mV/div) VISRC1 (2V/div) IIN (200mA/div) Input vs. Output Transient (VIN = 4.2V; Data 5) Time (500µs/div) VIN (200mV/div) VISRC1 (2V/div) IIN (200mA/div)

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012 Functional Description The AAT3128 is specifically designed to drive RGB color LEDs. This device is externally programmed via the sim - ple single wire serial S 2Cwire interface to set one of 16 color lighting modes based on four distinct preset color light mood schemes. In addition to the four color lighting moods, there are two brightness levels and two lightning sequence change speeds that may be selected. The AAT3128 utilizes a tri mode load switch (1X) and high efficiency (1.5X or 2X) charge pump boost con - verter intended for RGB color LED lighting applications. To maximize power conversion efficiency, an internal sensing circuit monitors the voltage required for the con- stant current source outputs and sets the load switch or charge pump modes based on the input battery voltage. As the battery discharges over time, the AAT3128 charge pump is enabled when the current source outputs near dropout. The charge pump initially starts in 1.5X mode. If the charge pump output droops enough for the current source output to become close to dropout, the charge pump will automatically transition to 2X mode. This load switch to charge pump control system provides the maximum power conversion efficiency for any given operating condition. The AAT3128 requires only four external components: two 1µF ceramic capacitors for the charge pump flying capacitors (C1 and C2), one 1µF ceramic input capacitor (CIN) and one 1µF ceramic output capacitor (C P). RGB LED Lighting Set-Up and Control The AAT3128 has four preset RGB LED color lighting moods which may be selected via the EN/SET function. These four lighting color moods are outlined in Table 1. Each lighting color mood mode selects a preset group of 64 unique colors that the system controller repeatedly sequences through at a selected fast or slow rate. RGB LED brightness and color change timing may be varied by a choice of two levels for both. The Brightness control permits the full current to power the RGB LED Functional Block Diagram Voltage Reference Soft Start 1MHz Oscillator 1. 5X Charge Pump S 2 Cwire Interface Control Current Level Program and LED Switch / Mood GND EN/SET RSET IN C1+ C1- C2+ C2- CP ISRC2 DR DG DB ISRC1

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012 based on the current set level programmed by the R SET resistor. The second dimming level is fixed at 6dB below that programmed by the R SET resistor. The pace of the color change for a given mood light option can be set to a fast or slow rate. Through the S 2Cwire interface, mood options allow the user to select between four different moods, each with two brightness levels and two speeds, based on the number of rising edges of the EN/SET pin. 16 unique moods are selected based on the settings in Table 2. EN/SET Serial Interface The lighting mood output is controlled by the EN/SET pin, using Skyworks' Simple Serial Control™ (S 2Cwire) interface. The interface records rising edges of the EN/ SET pin, and decodes them into 16 individual settings based on an internal preset ROM table. The interface counter can be clocked at speeds up to 1MHz. The rising edges of EN/SET input enable the IC and are counted for 1 to 16 edges based on the desired mode. Once the final clock cycle is input for the desired mode the EN/SET pin is held high to enable the device output. The device is disabled 500µs after the EN/SET pin transitions to a logic low state. The EN/SET timing is designed to accommodate a wide range of data rates. After the first rising edge of EN/SET, the charge pump is enabled and reaches full capacity after the soft-start time (TSS). During the soft start time, mul - tiple clock pulses may be entered on the EN/SET pin to set the final output current level with a single burst of clocks. A constant current is sourced and the programmed color mood is enabled as long as EN/SET remains in a logic high state. The current source outputs are switched off after EN/SET has remained in a low state for at least the TOFF timeout period. After the T OFF time out time, all internal registers are reset and the charge pump is disabled. It is advisable to issue a 500µs low pulse to reset the data registers before send new sets of data to change lighting modes. This will avoid any possibility of losing synchroni- zation between the AAT3128 and the system MCU. Mood Name Color Description M1 Rainbow 1 Full color wheel control with continu- ous smooth transitions M2 Electric Beat Pulsing Blue – White – Red color tones M3 Rainbow 2 Full color wheel control with varied timing for transitions M4 Firelight Red-Orange-Yellow flickering light Table 1: Programmable RGB LED Color Lighting “Moods.” Data Bright/Dim Fast/Slow Mood

1 B F M1

2 B F M2

3 B F M3

4 B F M4

5 B S M1

6 B S M2

7 B S M3

8 B S M4

9 D F M1

10 D F M2

11 D F M3

12 D F M4

13 D S M1

14 D S M2

15 D S M3

16 D S M4

Table 2: AAT3128 S2Cwire Programming Modes. EN/SET Timing EN/SET Code 1 2 3 OFFOFF tHI tLO tOFF Figure 1: S2Cwire Timing Diagram.

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012 Equivalent Series Resistance ESR is an important characteristic to consider when selecting a capacitor. ESR is a resistance internal to a capacitor that is caused by the leads, internal connec - tions, size or area, material composition, and ambient temperature. Capacitor ESR is typically measured in mil- liohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. Ceramic Capacitor Materials Capacitors used in AAT3128 applications range in value from 0.47µF to 2.2µF. Nominally a 1µF capacitor with a minimum voltage specification exceeding 6V is recom- mended. Ceramic capacitors in this range are typically composed of X7R, X5R, Z5U, or Y5V dielectric materials. The use of X5R and X7R dielectric capacitors is strongly recommended due to their inherent low ESR characteris- tics and improved tolerance specifications over the device operating temperature range. Capacitors that are physically larger will have a lower ESR when compared to a smaller case size capacitor made from an equivalent material. These larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. Layout Considerations The AAT3128 is a high-performance device that operates with a high switching frequency. To ensure optimal device performance and accommodate the fast switched capaci- tor transients generated by the AAT3128, special atten - tion should be given to the printed circuit board (PCB) layout. The PCB traces connecting C1 and C2 experience fast current transients. As a result, the trace lengths for C1 and C2 should be minimized by placing the compo- nents as closely as possible to the IC. This will minimize path resistance and reduce ringing due to the inductance associated with trace length. For best IC performance, CIN and COUT are placed as closely as possible to the IN and CP pins and are connected to a solid ground. AAT3128 Evaluation Board Layout Figure 3: AAT3128 Evaluation Board Figure 4: AAT3128 Evaluation Board Component Side PCB Layout. Solder Side PCB Layout.

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012 AAT3128 Evaluation Board Schematic VD D1 GP 52 GP 43 GP 34 GP 2 5GP 1 6GP 0 7VS S 8 U2 PIC12F675 1µF 1µF 1µF 1µF 1 2 3 LED2 RED DC+DC- VIN GND GND VR1 (opt) POT10K LED1 GRN GN D GND GND J2 R7 100K GND VIN 38.3k GND JP1 Down SW1 Up SW2 Cycle SW3 GN D5 RS ET1 IN6 C2 + 8 DG2 DR3 C2 -7 DB4 C1 - 9C1 + 10CP 11IS RC 1 12IS RC 2 13EN /S ET 14 U1 AAT3128 C2 1µF RGB2 RGB JPx RGB1 RGB JPx GND

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012

Ordering Information

Package Marking1 Part Number (Tape and Reel)2 TSOPJW-14 VMXYY AAT3128ITO-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

2.40 ± 0.10 2.85 ± 0.20

0.40 BSC

0.20 + 0.10 - 0.05 0.15 ± 0.05

0.04 REF

0.45 ± 0.15 2.75 ± 0.25 4° ± 4° 1.05 + 0.05 - 0.00 1.00 + 0.000 - 0.075 3.05 + 0.05 - 0.10 0.05 + 0.05 - 0.04 Top View Side View End View All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.

RGB LED Fashion Lighting Controller Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202263A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012 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. Sky - works 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 here- under, 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, IN - CLUDING 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 en- vironmental 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 pub- lished 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.