Evaluation Board for the AAT1210 High Power DC/DC Boost Converter

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1 Introduction The AAT0 evaluation board provides a platform for test and evaluation of the AAT0 switching boost regulator. The evaluation board demonstrates suggested size and placement of external components to achieve output voltages from V IN + 0.5V to 8V and up to 900mA of maximum output current (V OUT = 5V). The external components are selected for small size to suit portable electronic applications while the layout has been optimized to achieve high efficiency and low output noise with the TDFN4- package. The design operates across an input voltage range from.7 to 5.5V. The AAT0 evaluation board provides a single 5V or 9V output voltage rail with 80mA (V OUT = 9V) to 600mA (V OUT = 5V) of typical output current respectively. The desired output is determined by the jumpers positioned on JP, JP, and the logic level of the SEL pin. Connecting SEL to logic high (V IN ) sets the output voltage to 9V while logic low (GND) sets the output voltage to 5V. S Cwire programming sets the output from 5V (FB = 0.6V, default) to 0.V (FB =.V). This document provides details on the operation and testing of the AAT0 evaluation board. Modification of the resistor divider network (R, R, R) allows outputs from V IN + 0.5V to 8V. Operating Specification Specification Description/Conditions Min Typ Max Units Output Voltage Input Voltage V Output Error Voltage V OUT = V IN + 0.5V to 8V; % tolerance R, R, R % EN/SET = V IN (JP), SEL = GND (JP) 5.0 V EN/SET = V IN (JP), SEL = V IN (JP) 9.0 EN/SET = S Cwire ; SEL = GND (JP) V IN =.7 to 4.5V, V OUT = 5V, % Load Regulation 00 Output Current V IN =.7 to 4.5V, V OUT = 5V, 5% Load Regulation 600 V IN =.7 to 5.5V, V OUT = 9V, % Load Regulation 50 ma V IN =.7 to 5.5V, V OUT = 9V, 5% Load Regulation 80 Table : AAT0 Evaluation Board Operating Specification.. Maximum nominal output voltages should be limited to 8.0V to avoid damaging the AAT0 device.. Contact AATI Sales Representative for S Cwire programming options.

2 Schematic D Schottky 5V at 600mA 9V at 00mA C 0µF 0V R 6.5k R 549 R 4.99k LIN LIN 4 FB 5 FB L 0.47µH 6 GND 7 PGND 8 PGND PGND U VP 6 VP 5 EN/SET 4 SEL VIN N/C SW 0 SW 9 AAT0_TDFN4-6 VIN:.7V to 5.5V R4 C 4.7µF 0K JP Enable JP Select Figure : AAT0 Evaluation Board Schematic Bill of Materials (BOM) Component Part Number Description Manufacturer U AAT0IRN High Power DC/DC Boost Converter with Optional Dynamic Voltage Programming Skyworks C C608X5R0J475K TDK Ceramic Capacitor: 4.7µF, 6.V, 060 GRM88R60J475K Murata C C0X5RA06K TDK Ceramic Capacitor: 0µF, 0V, 0805 GRMBR6A06K Murata L SD0-R47-R 0.47µH,.54A Cooper Bussmann D MBR050T 0V, 0.5A Schottky Diode SOD- On Semiconductor R CRCW06065F 6.5KΩ, %, 060, /0W Vishay R CRCW060549RF 549Ω, %, 060, /0W Vishay R CRCW060499F 4.99KΩ, %, 060, /0W Vishay R4 CRCW06000F 0KΩ, %, 060, /0W Vishay JP, JP PRPN40PAEN Connecting Header, mm Sullins Electronics Table : AAT0 Evaluation Board Component Listing. Setup. Configure the specified test equipment as shown in Figure, where Jumper and Jumper placement options are illustrated.. An additional 00µF or greater capacitor [C ADD in Figure ] may be required to decouple the input power supply and maintain stable operation. Solder the additional capacitor to the VIN and GND terminals on the AAT0 evaluation board.. Input power supply with remote sense may be used. This simplifies the test procedure and maintains high accuracy of the input voltage across the loading range. Connect remote sense from input power source remote sense terminals to the VIN and GND terminals on the AAT0 evaluation board (optional, not shown in Figure ).

3 Figure : AAT0 Evaluation Board Connection Diagram with Jumper and Jumper Settings, Including SCwire Interface Connections.

4 Evaluation/Testing Enabling [Jumper initially in ON position on JP]. Turn-Off With input voltage applied, remove Jumper and re-insert in the OFF position on JP. The output voltage will decay to zero.. Turn-On With input voltage applied, remove Jumper on JP and re-insert in the ON position on JP. The output voltage will recover to its nominal DC value of 5V or 9V, depending on the Jumper position/setting. Output Voltage Setting. Option : Static Output Voltage Most DC/DC boost converter applications require a static (fixed) output voltage. If a static voltage is desired, the FB pin should be connected directly to FB and a resistor between FB and FB pins is not required. A static output voltage can be configured by pulling the SEL either logic high or logic low. SEL pin high activates the FB reference pin to.v (nominal). Alternatively, the SEL pin is pulled low to activate the FB reference at 0.6V (nominal). Table provides details of resistor values for common output voltages from 5V to 8V for SEL = High and SEL = Low options.. Option : Dynamic Voltage Control Using the SEL Pin The output may be dynamically adjusted between two output voltages by toggling the SEL logic pin. Output voltages V OUT() and V OUT() correspond to the two output references, FB and FB. Pulling the SEL pin logic high activates V OUT(), while pulling the SEL pin logic low activates V OUT(). In addition, the ratio of output voltages V OUT() / V OUT() is always less than.0, corresponding to a X (maximum) programmable range.. Option : Dynamic Voltage Control Using S Cwire Interface The output can be dynamically adjusted by the host controller to any of 6 pre-set output voltage levels using the integrated S Cwire interface. The EN/SET pin serves as the S Cwire interface input. The SEL pin must be pulled low when using the S Cwire interface. Skyworks' S Cwire serial interface is a proprietary high-speed single-wire interface. The S Cwire interface records rising edges of the EN/SET input and decodes into 6 different states. Each state corresponds to a voltage setting on the FB pin, as shown in Table S Cwire Output Voltage Programming The AAT0 is programmed through the S Cwire interface according to Table 4. The rising clock edges received through the EN/SET pin determine the feedback reference and output voltage set point. Upon power-up with the SEL pin low and prior to S Cwire programming, the default feedback reference voltage is set to 0.6V. Contact AATI Sales Representative for S Cwire programming options. 5. S Cwire Serial Interface Timing The S Cwire serial interface has flexible timing. Data can be clocked-in at speeds up to MHz. After data has been submitted, EN/SET is held high to latch the data for a period T LAT. The output is subsequently changed to the predetermined voltage. When EN/SET is set low for a time greater than T OFF, the AAT0 is disabled. When disabled, the register is reset to the default value, which sets the FB pin to 0.6V if EN is subsequently pulled high. Load and Line Regulation. Enable the AAT0 by placing Jumper in the ON position on JP, as shown in Figure.. Turn on the input power supply and set to desired input voltage based on the DC voltmeter.. Vary the output load from 0 to 600mA (V OUT = 5V and V IN =.7V to 4.5V) or 0 to 80mA (V OUT = 9V and V IN =.7V to 5.5V). 4

5 V OUT() (SEL = High) V OUT() (SEL = Low) R (kω) R = 4.99kΩ R (kω) 5.0V V V V V V V V V V V V V V V V V V 0-6.0V V V 5.0V V 9.0V V 0.0V V 0.0V V.0V V 0.0V V 0.0V V.0V V.0V V.0V V 5.0V 5. Table : SEL Pin Voltage Control Resistor Values (% resistor tolerance). EN/SET Rising Edges FB Reference Voltage (V) EN/SET Rising Edges FB Reference Voltage (V) 0.60 (Default) Table 4: S Cwire Voltage Control Settings (SEL=Low). 5

6 Printed Circuit Board Figure : AAT0 Evaluation Board Top Layer (not to scale). Figure 4: AAT0 Evaluation Board Bottom Layer (not to scale). Copyright 0 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, 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 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 are incorporated by reference. 6