DATA SHEET AAT4650 5V/3V PC Card Power Switch General Description Features The AAT4650 SmartSwitch is a single channel PC card (PCMCIA) power switch. It is used to select between two different voltage inputs, each between 2.7V and 5.5V. An internal switch powers the circuitry from whichever input voltage is higher. The device’s output, VCC, is slew rate controlled and current limited, in compliance with PC card specifications. The current limit response time to a short circuit is typically 1μs. The internal P-channel MOSFET switches are configured to break before make; that is, both switches cannot be closed at the same time. Controlled by a 2-bit parallel interface, the four states for VCC are VCC5, VCC3, high impedance, or ground. When in the ground state, VCC is pulled to ground by a 5k resistor. An open drain FAULT output is asserted during overcurrent conditions. During power-up slewing, FAULT also signals that VCC is out of tolerance. An internal overtemperature sensor forces VCC to a high impedance state when an over-temperature condition exists. Quiescent current is typically a low 15μA, as long as ICC is less than approximately 500mA. Above this load current, the quiescent current increases to 200μA. • • • • • • • • • 2.7V to 5.5V Input Voltage Range 80m (5V) Typical RDS(ON) Low Quiescent Current 15μA (typ) Reverse-Blocking Switches Short-Circuit Protection Over-Temperature Protection FAULT Flag Output Temperature Range: -40°C to +85°C 8-Pin SOP Package Applications • Notebook Computer • PDA, Subnotebook • Power Supply Multiplexer Circuit The AAT4650 is available in a Pb-free, 8-pin SOP package and is specified over the -40°C to +85°C temperature range. Typical Application 8 VCC5 VCC3 5 CTL1 CTL0 FAULT CIN5 1μF GND CIN3 1μF 3 2 4 1 VCC5 VCC3 CTL1 AAT4650 VCC CTL0 FAULT GND 6,7 VCC COUT 0.1μF GND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 1 DATA SHEET AAT4650 5V/3V PC Card Power Switch Pin Descriptions Pin # Symbol 1 2 3 4 5 6, 7 8 GND CTL0 CTL1 FAULT VCC3 VCC VCC5 Function Ground connection. Control input (see Control Logic Table below). Control input (see Control Logic Table below). Open drain output; signals over-current condition. 3V supply. Output (see Control Logic Table below). 5V supply. Pin Configuration SOP-8 (Top View) 1 1 2 8 7 2 GND CTL0 CTL1 FAULT 3 6 4 5 VCC5 VCC VCC VCC3 Control Logic Table 2 CTL1 CTL0 Function Result 0 0 1 1 0 1 0 1 5k 5V 3V HiZ VCC to GND VCC = VCC5 VCC = VCC3 Both FETs OFF Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 DATA SHEET AAT4650 5V/3V PC Card Power Switch Absolute Maximum Ratings1 Symbol Description VCC3, VCC5 VCC IMAX TJ TLEAD VESD IN to GND OUT to GND Maximum Continuous Switch Current Operating Junction Temperature Range Maximum Soldering Temperature (at Leads) ESD Rating2 — HBM Value Units -0.3 to 6 -0.3 to 6 Current Limited -40 to 150 300 4000 V V A °C °C V Value Units 120 1.0 °C/W W Thermal Characteristics3 Symbol JA PD Description Thermal Resistance Power Dissipation 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. 2. Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. 3. Mounted on an FR4 board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 3 DATA SHEET AAT4650 5V/3V PC Card Power Switch Electrical Characteristics VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C; bold values designate full temperature range. Symbol Description Conditions High Impedance Output Leakage Current Off Mode, VCC = 0V Min Typ Max Units 1 μA 2.5 A 110 100 m VCC Output ICC Hi-Z Iccsc Short-Circuit Current Limit RDS(ON) On Resistance Switch Resistance Temperature Coefficient VCC Switching Time (Refer to Figure 1) t1 Output Turn-On Delay Time t2 Output Turn-On Delay Time t3 Output Rise Time t4 Output Rise Time t5 Output Turn-Off Delay Time t6 Output Turn-Off Delay Time t7 Output Fall Time to Off State t8 Output Fall Time to Off State t9 Output Fall Time to HiZ State t10 Output Fall Time to HiZ State Power Supply VCC3 VCC3 Operation Voltage VCC5 VCC5 Operation Voltage VCC = VCCIN -0.5V, On Mode VCC3 or VCC5 Selected, TA = 25°C VCC = 3.0V, TA = 25°C VCC = 5.0V, TA = 25°C 1.0 85 80 Tcrds ICC3 VCC3 Supply Current ICC5 VCC5 Supply Current 2800 VCC VCC VCC VCC VCC VCC VCC VCC VCC VCC = = = = = = = = = = 0V to 10% of 3.3V, ROUT = 10 0V to 10% of 5.0V, ROUT = 10 10% to 90% of 3.3V, RLOAD = 10 10% to 90% of 5.0V, RLOAD = 10 3.3V to 90% of 3.3V, RLOAD = 10 5.0V to 90% of 5.0V, RLOAD = 10 90% to 10% of 3.3V, RLOAD = 10 90% to 10% of 5.0V, RLOAD = 10 90% to 10% of 3.3V, RLOAD = 10 90% to 10% of 5.0V, RLOAD = 10 300 300 500 500 1000 1000 2.7 2.7 VCC VCC VCC VCC VCC VCC = = = = = = 5V or HiZ or Off, VCC3 < VCC5, ICC Out = 0 3.3V, VCC3 < VCC5, ICC Out = 0 Off, VCC5 > VCC3, ICC Out = 0 HiZ, VCC5 > VCC3, ICC Out = 0 3.3V, VCC5 > VCC3, ICC Out = 0 5V, VCC5 > VCC3, ICC Out = 0 5 10 10 15 Parallel Interface VCTLLOW CTL Input Low Voltage VCTLHI ISINKCTL VFAULTLOW ISINKFAULT Other OTMP 4 CTL Input High Voltage CTL Input Leakage FAULT Logic Output Low Voltage FAULT Logic Output High Leakage Current Over-Temperature Shutdown ppm/ºC 2000 1500 3000 3000 400 400 200 200 1500 2000 5.5 5.5 1 20 1 40 40 40 0.8 VCC3 or VCC5 = 2.7V to 3.6V VCC3 or VCC5 = 4.5V to 5.5V VCTL = 5.5V ISINK = 1mA VFAULT = 5.5V 2.0 2.4 μs V V μA μA V V 0.01 1 0.4 μA V 0.05 1 μA 125 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 °C DATA SHEET AAT4650 5V/3V PC Card Power Switch Typical Characteristics Unless otherwise noted, TA = 25°C. Quiescent Current vs. Temperature Current Limit (ICC5) (VCC = VCC3) Quiescent Current (μA) 30 VCC3 = 3V CTL0 = 5V VCC5 = 5V CTL1 = 0V 25 2 1.5 20 15 1 10 5 0.5 0 -40 -20 0 20 40 60 80 100 0 120 0 0.5 1 1.5 2 2.5 3 Temperature (°C) Output Voltage (V) Current Limit Off-Switch Current vs. Temperature (VCC = VCC5) (ICC3) Off-Switch Current (μA) 2 1.5 1 0.5 0 0 1 2 3 4 5 1.0000 0.1000 VCC3 = 3V VCC5 = 5V CTL1 = 0V CTL0 = 0V 0.0100 0.0010 0.0001 0.0000 6 -40 -20 0 Output Voltage (V) 20 40 60 80 100 120 100 120 Temperature (°C) Off-Switch Current vs. Temperature RDS(ON) vs. Temperature 120.0 1.0000 0.1000 VCC3 = 3V VCC5 = 5V CTL1 = 0V CTL0 = 0V 110.0 RDS(ON) (mΩ) Off-Switch Current (μA) (ICC3) 0.0100 0.0010 0.0001 VCC = VCC3 = 3.0V 90.0 80.0 VCC = VCC5 = 5.0V 70.0 60.0 0.0000 -40 100.0 -20 0 20 40 60 Temperature (°C) 80 100 120 -40 -20 0 20 40 60 80 Temperature (°C) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 5 DATA SHEET AAT4650 5V/3V PC Card Power Switch Typical Characteristics Unless otherwise noted, TA = 25°C. Turn-On/Off Response Turn-On/Off Response (10Ω, 1μF Load) (15Ω, 1μF Load) CTL1 (5V/div) CTL0 (5V/div) FAULT (5V/div) FAULT (5V/div) VCC (2V/div) VCC (2V/div) IVCC3 (200mA/div) IVCC5 (200mA/div) Time (500μs/div) Time (500μs/div) Short Circuit Through 0.6Ω Short Circuit Through 0.3Ω 11 4 5 Output Current 2 2 Output Voltage 0 -1 -2 0 2 4 6 8 Time (μs) 10 Input and Output (V) 8 9 6 Input Voltage 6 4 Output Current 3 2 Output Voltage 0 0 -3 -2 0 2 4 6 8 Time (μs) Thermal Shutdown Response CTL1 (5V/div) FAULT (5V/div) VCC (1V/div) IVCC5 (500mA/div) Time (100ms/div) 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 10 Output (A) Input Voltage 6 8 Output (A) Input and Output (V) 8 DATA SHEET AAT4650 5V/3V PC Card Power Switch Functional Block Diagram VCC3 VCC5 Body Control VCC OverTemperature CTL1 CTL0 OverCurrent OverCurrent Slew Rate Slew Rate 5kΩ FAULT Control Logic GND Functional Description The AAT4650 is a single channel power switch that can be used in any application where dual power supply multiplexing is required. Typical applications include PC card applications not requiring a 12V power supply, or applications where power is switched, for example, between 5V for operation and 3.3V for standby mode. The AAT4650 operates with input voltages ranging from 2.7V to 5.5V in any combination and automatically powers its internal circuitry off of whichever input voltage is higher. Two identical low RDS(ON) P-channel MOSFETs serve as the power multiplexing circuit with a common drain as the VCC output and independent sources as the two VCC3 and VCC5 inputs. A 2-bit parallel interface determines the state of the multiplexer: VCC = VCC3, VCC = VCC5, VCC with resistive pull down to ground, or VCC high impedance. When the state is set to either of the two inputs, the multiplex- ing circuit will slowly slew the VCC output to the new voltage level which protects the upstream power supply from sudden load transients. When the resistive pull down is chosen for VCC, the VCC output is quickly discharged by the resistive pull down. The AAT4650 always serves as an electronic fuse by limiting the load current if it exceeds the current limit threshold. During power-up into a short, the current will gradually increase until the current limit is reached. During a sudden short circuit on the output, the current limit will respond in 1μs to isolate and protect the upstream power supply from the load short circuit. In most applications, because the response time is so fast, a short circuit to VCC will not affect the upstream supply, so system functionality will not be affected. In the case of an over-current condition, an open drain FAULT flag output will signal the event. The FAULT output is also active during output voltage slew, and becomes inactive once the output is within regulation. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 7 DATA SHEET AAT4650 5V/3V PC Card Power Switch Applications Information Input Capacitor A 1μF or larger capacitor is typically recommended for CIN. A CIN capacitor is not required for basic operation; however, it is useful in preventing load transients from affecting up-stream circuits. CIN should be located as close to the device VIN pin as practically possible. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CIN. There is no specific capacitor equivalent series resistance (ESR) requirement for CIN. However, for higher current operation, ceramic capacitors are recommended for CIN due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. Output Capacitor A 0.1μF or greater capacitor is generally required between VCC and GND. Likewise, with the output capacitor, there is no specific capacitor ESR requirement. If desired, COUT may be increased to accommodate any load transient condition. Parallel Interface / Break Before Make A 2-bit parallel interface determines the state of the VCC output. The logic levels are compatible with CMOS or TTL logic. A logic low value must be less than 0.8V, and a logic high value must be greater than 2.4V. In cases where the interface pins rapidly change state directly from 3V to 5V (or vice versa), internal break-beforemake circuitry prevents any back flow of current from one input power supply to the other. In addition, the body connections of the internal P-channel MOSFET switches are always set to the highest potential of VCC3, VCC5, or VCC, which prevents any body diode conduction, power supply backflow, or possible device damage. FAULT Output The FAULT output is pulled to ground by an open drain N-channel MOSFET during an over-current or output slew condition. It should be pulled up to the reference power supply of the controller IC via a nominal 100k resistor. Voltage Regulation The PC card specification calls for a regulated 5V supply tolerance of ±5%. Of this, a typical power supply will drop less than 2% and the PCB traces will drop another 1%. This leaves 2% for the AAT4650 as the PC card 8 switch. In the PC card application, the maximum allowable current for the AAT4650 is dominated by voltage regulation, rather than by thermal considerations, and is set by either the current limit or the maximum RDS(ON) of the P-channel MOSFET. The maximum RDS(ON) at 85°C is calculated by applying the RDS temperature coefficient to the maximum room temperature RDS(ON): RDS(ON)(MAX) = RDS(ON)25 × (1 + [TC ∙ ΔT]) -orRDS(ON)(MAX) = 100mΩ (1 + [0.0028 ∙ 60]) = 116.8mΩ The maximum current is equal to the 2% tolerance of the 5V supply (100mV) across the AAT4650 divided by RDS(ON)(MAX). Or: IMAX5 = 100mV = 856.2mA 116.8mΩ For the 3.3V supply in the PC card application, the conditions are a bit relaxed, with the allowable voltage regulation drop equal to 300mV. With a 2% supply and 1% PCB trace regulation, the PC card switch can have a 200mV drop. So: IMAX3 = 200mV = 1.5A 134mΩ Since 1.5A is the nominal current limit value, the AAT4650 will current limit before IMAX3 is reached. Thermal issues are not a problem in the SOP-8 package since JA, the package thermal resistance, is only 120°C/W. At any given ambient temperature (TA) the maximum package power dissipation can be determined by the following equation: PD(MAX) = TJ(MAX) -TA θJA Constants for the AAT4650 are maximum junction temperature, TJ(MAX) = 125°C, and package thermal resistance, JA = 120°C/W. Worst case conditions are calculated at the maximum operating temperature where TA = 85°C. Typical conditions are calculated under normal ambient conditions where TA = 25°C. At TA = 85°C, PD(MAX) = 333mW. At TA = 25°C, PD(MAX) = 833mW. Maximum current is given by the following equation: IOUT(MAX) = PD(MAX) RDS(ON) For the AAT4650 at 85°C, IOUT(MAX) = 1.65A, a value greater than the internal minimum current limit specification. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 DATA SHEET AAT4650 5V/3V PC Card Power Switch Over-Current and Over-Temperature Protection Because many AAT4650 applications provide power to external devices, it is designed to protect its host device from malfunctions in those peripherals through slew rate control, current limiting, and thermal limiting. The AAT4650 current limit and thermal limit serve as an immediate and reliable electronic fuse without any increase in RDS(ON) for this function. Other solutions, such as a poly fuse, do not protect the host power supply and system from mishandling or short circuiting peripherals; they will only prevent a fire. The AAT4650 high-speed current limit and thermal limit not only prevent fires, they also isolate the power supply and entire system from any activity at the external port and report a mishap by means of a FAULT signal. Over-current and over-temperature go hand in hand. Once an over-current condition exists, the current supplied to the load by the AAT4650 is limited to the overcurrent threshold. This results in a voltage drop across the AAT4650 which causes excess power dissipation and a package temperature increase. As the die begins to heat up, the over-temperature circuit is activated. If the temperature reaches the maximum level, the AAT4650 automatically switches off the P-channel MOSFETs. While they are off, the over-temperature circuit remains active. Once the temperature has cooled by approximately 10°C, the P-channel MOSFETs are switched back on. In this manner, the AAT4650 is thermally cycled on and off until the short circuit is removed. Once the short is removed, normal operation automatically resumes. To save power, the full high-speed over-current circuit is not activated until a lower threshold of current (approximately 500mA) is exceeded in the power device. When the load current exceeds this crude threshold, the AAT4650 quiescent current increases from 15μA to 200μA. The high-speed over-current circuit works by linearly limiting the current when the current limit is reached. As the voltage begins to drop on VCC due to current limiting, the current limit magnitude varies and generally decreases as the VCC voltage drops to 0V. Switching VCC Voltage The AAT4650 meets PC card standards for switching the VCC output by providing a ground path for VCC, as well as a high impedance state. The PC card protocol for determining low voltage operations is to first power the peripheral with 5V and poll for 3.3V operation. When transitioning from 5V to 3.3V, VCC must be discharged to less than 0.8V to provide a hard reset. The resistive ground state (CTL1 = 0, CTL0 = 0) will accommodate this. The ground state will also guarantee the VCC voltage to be discharged within the specified amount of time (100ms). Printed Circuit Board Layout Recommendations For proper thermal management, to minimize PCB trace resistance, and to take advantage of the low RDS(ON) of the AAT4650, a few circuit board layout rules should be followed: VCC3, VCC5, and VCC should be routed using wider than normal traces; the two VCC pins (Pins 6 and 7) should be connected to the same wide PCB trace; and GND should be connected to a ground plane. For best performance, CIN and COUT should be placed close to the package pins. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 9 DATA SHEET AAT4650 5V/3V PC Card Power Switch Timing Diagram 5 0 CTL0,1 5 Vcc 0 t1, t2 t3, t4 t5, t6 t7, t8 t9, t10 Figure 1: VCC Switching Time Diagram. Refer to VCC Switching Time specifications in the Electrical Characteristics section for definitions of t1 to t10. Typical PC Card Application Circuit 8 Power 5V Supply 3.3V 5 3 CIN5 1μF PC Card Controller VCC CIN3 1μF 2 4 1 100kΩ VCC5 VCC3 CTL1 AAT4650 VCC CTL0 FAULT GND PC Card Slot 6,7 VCC COUT 0.1μF FAULT CTL1 CTL0 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 DATA SHEET AAT4650 5V/3V PC Card Power Switch Evaluation Board Layout The AAT4650 evaluation board layout follows the printed circuit board layout recommendations and can be used for good applications layout. Note: Board layout shown is not to scale. Figure 2: Evaluation Board Top Side Silk Screen Layout / Assembly Drawing. Figure 3: Evaluation Board Component Side Layout. Figure 4: Evaluation Board Solder Side Layout. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012 11 DATA SHEET AAT4650 5V/3V PC Card Power Switch Ordering Information Package Marking Part Number (Tape and Reel)1 SOP-8 4650 AAT4650IAS-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 3.90 ± 0.10 6.00 ± 0.20 SOP-8 4.90 ± 0.10 0.42 ± 0.09 × 8 1.27 BSC 45° 4° ± 4° 0.175 ± 0.075 1.55 ± 0.20 0.375 ± 0.125 0.235 ± 0.045 0.825 ± 0.445 All dimensions in millimeters. 1. Sample stock is generally held on all part numbers listed in BOLD. 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. 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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. 12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012