EVALUATION BOARD DATA SHEET EV150 Evaluation Board for the AAT4674 Power Supply Selector Switch Introduction The AAT4674 is members of Skyworks' Application Specific Power Management SmartSwitch™ family. These devices are dual input single output power supply selector switches designed to operate from batteries, or any other power supply with an input voltage up to 6V. The AAT4674 connects the supply voltage on IN1 to OUT, or IN2 to OUT, through a very low RDS(ON) power MOSFET that minimizes voltage drops and power dissipation. The enable (EN) and select (SEL) pin voltages control the operational state of the internal power MOSFET switches. Once enabled, the SEL pin will switch between the IN1 and IN2 inputs. If both input voltages are below the UVLO, then the AAT4674 output floats. The power switch is current limited and the current limit thresholds can be programmed through the resistors on the IIN1 and IIN2 pins respectively. The AAT4674 is available in thermally enhanced, space-saving Pb-free 12-pin TSOPJW packages. The specified for operation over the -40°C to +85°C temperature range. AAT4674 is Operating Specification Specification Description/Conditions IN1 IN2 VIH(EN) VIL(EN) VIH(SEL) VIL(SEL) Current Limit Range Min Input Voltage Sources 2.5 Disabling Enabling VIN2 = VOUT VIN1 = VOUT R2 and/or R3 = 49.9kΩ R2 and/or R3 = 499kΩ 1.6 Typ Max Units 6 V V 0.4 1.6 V 0.4 2 0.2 A Table 1: AAT4674 Evaluation Board Operating Specification. Schematic C1 2.2µF MAIN AUX J1 C2 2.2µF 2 1 Header 2 1 2 3 4 5 6 U1 IN1 IN1 IN2 IN2 EN GND OUT OUT IIN1 IIN2 SEL GND 12 11 10 9 8 7 OUT IAUX AAT4674 EN R1 100K C3 2.2µF IMAIN R3 49.9K GND R2 49.9K PWRSEL Figure 1: AAT4674 Evaluation Board Schematic. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202275A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 17, 2012 1 EVALUATION BOARD DATA SHEET EV150 Evaluation Board for the AAT4674 Power Supply Selector Switch Bill of Materials (BOM) Component Part Number Description Manufacturer U1 AAT4674 C1608X5R1C225K GRM188R61A225K CRCW06031003F CRCW06034992F PRPN401PAEN Power Supply Selector Switch Skyworks TDK Murata Vishay Vishay Sullins Electronics C1-C3 R1 R2, R3 J1 2.2µF, ≥10V, 0603, X5R or X7R 100kΩ, 0603, 1% 49.9kΩ, 0603, 1% Connecting Header, 2mm Table 2: Component Listing. Setup [see Figure 2] 1. Jumper 1 placement options are illustrated in Figure 2. 2. Connect two voltage sources to the MAIN and AUX terminals with values between 2.5V and 6V. 3.The EN terminal must be kept open (not connected to a voltage source), the Jumper 1 connects the EN pin to the power supply connected to the MAIN terminal. When Jumper 1 is removed the EN pin is connected to ground through the R1 resistor, under this condition the AAT4674 will be enabled. 4. With R2 and R3 equal to 49.9kΩ, the current limit set for MAIN and AUX voltage sources is 2A (typ). Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com EVALUATION BOARD DATA SHEET 202275A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 17, 2012 EVALUATION BOARD DATA SHEET EV150 Evaluation Board for the AAT4674 Power Supply Selector Switch Figure 2: AAT4674 Evaluation Board Connection Diagram with Jumper 1 Settings. Evaluation/Testing Enabling [Jumper 1 initially in OFF position on EN] 1.Turn-Off With both input voltage sources applied (MAIN and AUX), insert Jumper 1. The output voltage will decay to zero. 2.Turn-On With both input voltage sources applied (MAIN and AUX), remove Jumper 1. The output voltage will recover to its nominal DC value equal to VMAIN (PWRSEL = ‘0’) or VAUX (PWRSEL=’1’). Current Limit Setting 1. R2 and R3 are currently set to 49.9kΩ, which results in a typical 2A current limit. 2. A lower current limit setting can be accomplished by increasing the R2 and/or R3 values, with an upper limit of 499kΩ for a 0.2A current limit. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202275A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 17, 2012 3 EVALUATION BOARD DATA SHEET EV150 Evaluation Board for the AAT4674 Power Supply Selector Switch Printed Circuit Board Figure 3: AAT4674 Evaluation Board Top Layer (not to scale). Figure 4: AAT4674 Evaluation Board Bottom Layer (not to scale). 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. 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