DATA SHEET AAT4608 Current Limited Load Switch in a SOT23 Package General Description Features The AAT4608 SmartSwitch is a member of Skyworks' Application Specific Power MOSFET™ (ASPM™) product family. It is a current limited P-channel MOSFET power switch designed for high-side load switching applications. This switch operates with inputs ranging from 2.7V to 5.5V, making it ideal for both 3V and 5V systems. An integrated current-limiting circuit protects the input supply against large currents which may cause the supply to fall out of regulation. The AAT4608 is also protected from thermal overload which limits power dissipation and junction temperatures. It can be used to control loads that require up to 1A. Current limit threshold is programmed with a resistor from SET to ground. The quiescent supply current is typically a low 15μA max. • 2.7V to 5.5V Input Voltage Range • Programmable Over-Current Threshold • Fast Transient Response: ▪ <1μs Response to Short Circuit • Low Quiescent Current ▪ 15μA Typical ▪ 1μA Max With Switch Off • 160m Typical RDS(ON) • Under-Voltage Lockout • Thermal Shutdown • Temperature Range: -40°C to +85°C • 4kV ESD Rating • 5-Pin SOT23 Package The AAT4608 is available in a Pb-free, 5-pin SOT23 package, and is specified over the -40°C to +85°C temperature range. Applications • • • • Hot Swap Supplies Notebook Computers Peripheral Ports Personal Communication Devices Typical Application INPUT 5 IN AAT4608 OUTPUT 1 OUT SOT23 3 SET GND 1μF GND 2 RSET 0.47μF GND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 1 DATA SHEET AAT4608 Current Limited Load Switch in a SOT23 Package Pin Descriptions Pin # Symbol 1 2 3 4 5 OUT GND SET N/C IN Function P-channel MOSFET drain. Connect 0.47μF capacitor from OUT to GND. Ground connection. Current limit set input. A resistor from SET to ground sets the current limit for the switch. No internal connection. P-channel MOSFET source. Connect 1μF capacitor from IN to GND. Pin Configuration SOT23-5 (Top View) 2 OUT 1 GND 2 SET 3 5 IN 4 N/C Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 DATA SHEET AAT4608 Current Limited Load Switch in a SOT23 Package Absolute Maximum Ratings1 TA = 25°C unless otherwise noted. Symbol Description VIN VSET, VOUT IMAX TJ TLEAD VESD IN to GND SET, 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 VIN + 0.3 2 -40 to 150 300 4000 V V A °C °C V Value Units 150 667 °C/W mW 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. Only one Absolute Maximum Rating should be applied at any one time. 2. Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. 3. Mounted on a demo board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 3 DATA SHEET AAT4608 Current Limited Load Switch in a SOT23 Package Electrical Characteristics VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C. Symbol VIN IQ VUVLO RDS(ON) ILIM ILIM(MIN) TRESP 4 Description Operation Voltage Quiescent Current Under-Voltage Lockout On Resistance Current Limit Minimum Current Limit Current Limit Response Time Conditions Min Typ 2.7 VIN = 5V, IOUT = 0 Rising Edge, 1% Hysteresis VIN = 5.0V VIN = 4.5V VIN = 3.0V RSET = 6.8k VIN = 5V 2.0 0.5 15 2.3 160 165 195 1 150 0.8 Max 5.5 30 2.7 180 V μA V m 230 2.0 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 Units A mA μs DATA SHEET AAT4608 Current Limited Load Switch in a SOT23 Package Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. Quiescent Current 25 40 20 Input Current (μA) Quiescent Current (μA) Quiescent Current vs. Temperature 15 10 5 0 -40 -20 0 20 40 60 80 100 30 20 10 120 0 2.5 Temperature (°C) 3 3.5 4 4.5 5 5.5 Input Voltage (V) RDS(ON) vs. Temperature Output Current vs. Output Voltage (RSET = 16kΩ) 250 200 RDS(ON) (mΩ) Output Current (A) 0.6 0.4 0.2 Input = 3V 150 Input = 5V 100 50 0 0 -40 0 1 2 3 4 -20 0 20 40 60 80 100 5 Temperature (°C) Output Voltage (V) Short-Circuit Through 0.6Ω 12 Input Voltage 8 4 Output Current 4 2 0 Output Voltage 0 -4 0 1 2 Time (μs) 3 8 9 Input Voltage 6 4 6 3 Output Current 2 0 Output Voltage 0 Output Current (A) 6 Input and Output Voltage (V) 8 Output Current (A) Input and Output Voltage (V) Short-Circuit Through 0.3Ω -3 0 1 2 3 Time (μs) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 5 DATA SHEET AAT4608 Current Limited Load Switch in a SOT23 Package Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. RSET vs. ILIM RSET Coefficient vs. ILIM 10 RSET ILIM Product (kV) RSET (kΩ) 100 10 1 0.1 9 8 7 6 5 1 10 ILIM (A) 0 0.5 1 1.5 ILIM (A) Current Limit vs. Temperature (RSET = 22.1kΩ; VIN - VOUT = 0.5V) Current Limit (%) 6 4 2 0 -2 -4 -6 -50 - 25 0 25 50 75 100 Temperature (°C) 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 2 DATA SHEET AAT4608 Current Limited Load Switch in a SOT23 Package Functional Block Diagram IN OUT Over-Temp Protection Undervoltage Lockout 1.2V Reference SET Current Limit RSET GND Applications Information Current Limit Using 10.5kΩ Setting Current Limit Device with high current limit at -40°C 0.88 A 1 0.8 ILIM (A) In most applications, the variation in ILIM must be taken into account when determining RSET. The ILIM variation is due to processing variations from part to part, as well as variations in the voltages at IN (Pin 5) and OUT (Pin 1), plus the operating temperature. See charts “Current Limit vs. Temperature,” and “Output Current vs. VOUT.” Together these three factors add up to a ±25% tolerance (see ILIM specification in Electrical Characteristics section). In the figure below, a cold device with a statistically higher current limit, and a hot device with a statistically lower current limit, both with RSET equal to 10.5k, are shown. While the chart, "RSET vs. ILIM” indicates an ILIM of 0.7A with an RSET of 10.5k, this figure shows that the actual current limit will be at least 0.525A, and no greater than 0.880A. 1.2 0.6 0.525 A 0.4 Device with low current limit at 85°C 0.2 0 0 1 2 3 4 5 VOUT (V) To determine RSET, start with the maximum current drawn by the load and multiply it by 1.33. (Typical_ILIM = minimum_ILIM / 0.75.) This is the typical current limit value. Next, refer to “RSET vs. ILIM” and find the RSET that Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 7 DATA SHEET AAT4608 Current Limited Load Switch in a SOT23 Package corresponds to the typical current limit value. Choose the largest resistor available that is less than or equal to it. For greater precision, the value of RSET may also be calculated using the ILIM RSET product found in the chart “RSET coefficient vs. ILIM.” The maximum current is derived by multiplying the typical current for the chosen RSET in the chart by 1.25. A few standard resistor values are listed in Table 1. RSET (k) Current Limit (Typ) (mA) Device Will Not Current Limit Below (mA) Device Always Current Limits Below (mA) 40.2 30.9 24.9 22.1 19.6 17.8 16.2 14.7 13.0 10.5 8.87 7.50 6.81 6.04 5.49 4.99 4.64 200 250 300 350 400 450 500 550 600 700 800 900 1000 1100 1200 1300 1400 150 188 225 263 300 338 375 413 450 525 600 675 750 825 900 975 1050 250 313 375 438 500 563 625 688 750 875 1000 1125 1250 1375 1500 1625 1750 Example: A USB port requires 0.5A. 0.5A multiplied by 1.33 is 0.665A. From the chart named “RSET vs. ILIM,” RSET should be less than 11k. 10.5k is a standard value that is a little less than 11k but very close. The chart reads approximately 0.700A as a typical ILIM value for 10.5k. Multiplying 0.700A by 0.75 and 1.25 shows that the AAT4608 will limit the load current to greater than 0.525A, but less than 0.875A. Operation in Current Limit When a heavy load is applied to the output of the AAT4608, the load current is limited to the value of ILIM determined by RSET (see Figure 1). Since the load is demanding more current than ILIM, the voltage at the output drops. This causes the AAT4608 to dissipate a larger than normal quantity of power, and its die temperature to increase. When the die temperature exceeds an over-temperature limit, the AAT4608 will shut down until is has cooled sufficiently, at which point it will start up again. The AAT4608 will continue to cycle on and off until the load (or power) is removed. Reverse Voltage The AAT4608 is designed to control current flowing from IN to OUT. If a voltage is applied to OUT which is greater than the voltage on IN, large currents may flow. This could cause damage to the AAT4608. Table 1: Current Limit RSET Values. 1 0.5 0.25 0 5 Output Current 4 3 1Ω load is turned on at time = 0 Output Voltage 2 Output Current (A) Output Voltage (V) 0.75 1 0 -0.05 0 0.05 0.1 0.15 0.2 0.25 0.3 Time (s) Figure 1: Overload Operation. 8 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 DATA SHEET AAT4608 Current Limited Load Switch in a SOT23 Package Ordering Information Package Marking1 Part Number (Tape and Reel)2 SOT23-5 CMXYY AAT4608IGV-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 SOT23-5 2.85 ± 0.15 1.90 BSC 0.075 ± 0.075 10°° ± 5°° 0.40 ± 0.10 0.15 ± 0.07 GAUGE PLANE 4°° ± 4°° 1.10 ± 0.20 0.60 REF 1.20 ± 0.25 2.80 ± 0.20 1.575 ± 0.125 0.95 BSC 0.60 REF 0.45 ± 0.15 0.10 BSC All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on 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. 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 • [email protected] • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 9