PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch General Description Features The AAT4610B SmartSwitch is a current limited P-channel MOSFET power switch designed for high-side load switching applications. This switch operates with inputs ranging from 2.4V 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 AAT4610B 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 9A. In shutdown mode, the supply current decreases to less than 1A. * Input Voltage Range: 2.4V to 5.5V * Programmable Over-Current Threshold * Fast Transient Response: 400ns Response to Short Circuit * Low Quiescent Current 9A Typical 1A Max with Switch Off * 145m Typical RDS(ON) * Only 2.5V Needed for ON/OFF Control * Under-Voltage Lockout * Thermal Shutdown * 4kV ESD Rating * UL Approved--File No. E217765 * 5-Pin SOT23 or 8-Pin SC70JW Package * Temperature Range: -40C to +85C The AAT4610B is available in a Pb-free 5-pin SOT23 or 8-pin SC70JW package and is specified over the -40C to +85C temperature range. Applications * * * * Hot Swap Supplies Notebook Computers Peripheral Ports Personal Communication Devices UL Recognized Component Typical Application INPUT OUTPUT IN AAT4610B OUT SOT23-5 ON (ON) SET ON/(ON) GND RSET 1F GND 4610B.2009.09.1.1 0.47F GND www.analogictech.com 1 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch Pin Descriptions Pin Number SOT23-5 SC70JW-8 Symbol 1 2 5 6, 7, 8 OUT GND 3 1 SET 4 2 ON 5 3, 4 IN Function P-channel MOSFET drain. Connect a 0.47F capacitor from OUT to GND. Ground connection. Current limit set input. A resistor from SET to ground sets the current limit for the switch. Enable input. Two versions are available, active-high and active-low. See Ordering Information for details. P-channel MOSFET source. Connect a 1F capacitor from IN to GND. Pin Configuration SOT23-5 (Top View) OUT GND SET 2 1 SC70JW-8 (Top View) 5 IN 2 3 4 ON SET ON IN IN www.analogictech.com 1 8 2 7 3 6 4 5 GND GND GND OUT 4610B.2009.09.1.1 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch Absolute Maximum Ratings1 TA = 25C, unless otherwise noted. Symbol Description VIN VON VSET, VOUT IMAX TJ TLEAD VESD IN to GND ON(ON) 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 -0.3 to VIN + 0.3 2 -40 to 150 300 4000 V V V A C C V Value Units 150 667 C/W mW Thermal Characteristics3 Symbol JA PD Description Thermal Resistance (SOT23-5 or SC70JW-8) Power Dissipation (SOT23-5 or SC70JW-8) 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. 4610B.2009.09.1.1 www.analogictech.com 3 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch Electrical Characteristics VIN = 5V, TA = -40C to +85C, unless otherwise noted. Typical values are TA = 25C. Symbol VIN IQ Description IQ(OFF) ISD(OFF) VUVLO Operation Voltage Quiescent Current Off Supply Current Off Switch Current Under-Voltage Lockout RDS(ON) On Resistance TCRDS ILIM ILIM(MIN) VON(L) Conditions Min Typ 2.4 VIN = 5V, ON (ON) = Active, IOUT = 0 ON (ON) = Inactive, VIN = 5.5V ON (ON) = Inactive, VIN = 5.5V, VOUT = 0 Rising Edge, 1% Hysteresis VIN = 5.0V, TA = 25C VIN = 4.5V, TA = 25C VIN = 3.0V, TA = 25C 9 0.01 1.8 145 150 190 On Resistance Temperature Coefficient Current Limit Minimum Current Limit ON (ON) Input Low Voltage Max Units 5.5 25 1 1 2.4 180 V A A A V m 230 2800 RSET = 6.8k VON(H) ON (ON) Input High Voltage ION(SINK) TRESP TOFF TON ON (ON) Input Leakage Current Limit Response Time Turn-Off Time Turn-On Time VIN = 2.7V to 5.5V1 VIN = 2.7V to < 4.2V1 VIN 4.2V to 5.0V1 VON = 5.5V VIN = 5V VIN = 5V, RL = 10 VIN = 5V, RL = 10 TSD Over-Temperature Threshold VIN = 5V 1.2 1.6 130 ppm/C 2.0 0.8 2.0 2.4 TJ Increasing TJ Decreasing A mA V V 0.01 0.4 4 12 125 115 1 12 200 A s s s C 1. For VIN outside this range, consult Typical ON (ON) Threshold curve. 4 www.analogictech.com 4610B.2009.09.1.1 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25C. Quiescent Current vs. Temperature Quiescent Current vs. Input Voltage 20 Quiescent Current (A) Quiescent Current (A) 20 15 10 5 0 -40 -20 0 20 40 60 80 100 15 10 5 0 0 120 1 2 3 4 5 Temperature (C) Input Voltage (V) Output Current vs. Output Voltage RDS(ON) vs. Temperature 6 (RSET = 22.1k) 0.4 RDS(ON) (m) Output Current (A) 0.5 0.3 0.2 0.1 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Input = 3V Input = 5V -40 -20 0 20 40 60 80 100 Output Voltage (V) Temperature (C) Off-Supply Current vs. Temperature Off-Switch Current vs. Temperature 10 1 0.1 0.01 -40 120 10 Off-Switch Current (A) Off-Supply Current (A) 0 240 220 200 180 160 140 120 100 80 60 40 20 0 -20 0 20 40 60 80 100 120 0.1 0.01 0.001 -40 -20 0 20 40 60 80 100 120 Temperature (C) Temperature (C) 4610B.2009.09.1.1 1 www.analogictech.com 5 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25C. Turn-On vs. Temperature Turn-Off vs. Temperature (RLOAD = 10; CLOAD = 0.47F) (RLOAD = 10; CLOAD = 0.47F) 6 20 VIN = 5V 10 0 -40 -20 0 VIN = 5V 5 VIN = 3V Turn-Off Time (s) Turn-On Time (s) 30 20 40 60 80 4 VIN = 3V 3 2 1 0 100 -40 -20 0 20 Temperature (C) Turn-On 5 ON Output Voltage (V) Voltage (V) 6 5 3 2 1 2 0 10 15 20 25 30 35 40 45 Output 1 -1 5 -10 50 -5 0 5 10 Time (s) 12 10 Input Voltage 8 5 6 4 4 Output Current 2 0 -0.5 2 0 Output Voltage -2 -4 0.0 0.5 1.0 1.5 30 35 40 45 50 2.0 2.5 3.0 2.00 1.80 1.60 1.40 VIH 1.20 VIL 1.00 0.80 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VIN (V) Time (s) 6 25 2.20 Output Current (A) Input and Output Voltage (V) 8 1 20 V IH and V IL vs. VIN 7 3 15 Time (s) Short-Circuit Through 0.3 6 100 3 0 0 ON 4 -1 -5 80 Turn-Off 6 -10 60 (RL = 10 ; CL = 0.47F) (RL = 10; CL = 0.47F) 4 40 Temperature (C) www.analogictech.com 4610B.2009.09.1.1 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25C. RSET vs. ILIM RSET Coefficient vs. ILIM 10 RSET ILIM Product (kV) RSET (k) 100 10 1 100 9 8 7 6 5 1000 10000 ILIM (mA) 0 0.5 1 1.5 2 ILIM (A) Output Current vs. Temperature (RSET = 22.1k) Current Limit (%) 0.5 0.4 0.3 0.2 0.1 0 -0.1 -50 - 25 0 25 50 75 100 Temperature (C) 4610B.2009.09.1.1 www.analogictech.com 7 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch Functional Block Diagram IN OUT Over-Temperature Protection UnderVoltage Lockout ON (ON) 1.2V Reference SET Current Limit RSET GND Setting Current Limit 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 and OUT, 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). Figure 1 illustrates a cold device with a statistically higher current limit and a hot device with a statistically lower current limit, both with RSET equal to 8.87k. While the chart, "RSET vs. ILIM" indicates an ILIM of 1.1A with an RSET of 10.5k, this figure shows that the actual current limit will be at least 0.825A and no greater than 1.375A. 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 corresponds to the typical current limit value. Choose the 8 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. Current Limit vs. Output Voltage (RSET = 8.87k) 1.6 IMAX = 1.375A 1.4 Current Limit (A) Application Information Device with high current limit at -40C 1.2 1.0 Device with low current limit at 85C 0.8 IMIN = 0.825A 0.6 0.4 0.2 0 0 1 2 3 4 5 Output Voltage (V) Figure 1: Current Limit Using 10.5k. www.analogictech.com 4610B.2009.09.1.1 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch Operation in Current Limit 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 10.5 8.87 7.5 6.81 6.04 5.49 4.99 4.64 225 300 350 425 450 525 600 675 700 1000 1100 1325 1600 1925 1950 2100 2350 169 225 263 319 338 394 450 506 525 750 825 994 1200 1444 1463 1575 1763 281 375 438 531 563 656 750 844 875 1250 1375 1656 2000 2406 2438 2625 2938 When a heavy load is applied to the output of the AAT4610B, the load current is limited to the value of ILIM determined by RSET (see Figure 2). Since the load is demanding more current than ILIM, the voltage at the output drops. This causes the AAT4610B 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 AAT4610B will shut down until is has cooled sufficiently, at which point it will startup again. The AAT4610B will continue to cycle on and off until the load is removed, power is removed, or until a logic high level is applied to ON. Enable Input In many systems, power planes are controlled by integrated circuits which run at lower voltages than the power plane itself. The enable input ON of the AAT4610B has low and high threshold voltages that accommodate this condition. The threshold voltages are compatible with 5V TTL and 2.5V to 5V CMOS. Table 1: Current Limit RSET Values 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 18k. 17.8k is a standard value that is a little less than 18k but very close. The chart reads approximately 0.525A as a typical ILIM value for 17.8k. Multiplying 0.525A by 0.75 and 1.25 shows that the AAT4610B will limit the load current to greater than 0.394A but less than 0.656A. Reverse Voltage The AAT4610B 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 AAT4610B. Overload Operation 1 0.5 0.25 0 5 Output Current 4 3 1 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 Figure 2: Overload Operation. 4610B.2009.09.1.1 www.analogictech.com 9 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch Ordering Information Package Enable Marking1 Part Number (Tape and Reel)2 SOT23-5 SC70JW-8 SOT23-5 SC70JW-8 ON (active high) ON (active high) ON (active low) ON (active low) 8FXYY 8GXYY B9XYY B8XYY AAT4610BIGV-1-T1 AAT4610BIJS-1-T1 AAT4610BIGV-T1 AAT4610BIJS-T1 All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/aboutus/quality.php. Package Information SOT23-5 2.85 0.15 1.90 BSC 0.40 0.10 0.075 0.075 0.15 0.07 4 4 10 5 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 GAUGE PLANE 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. 10 www.analogictech.com 4610B.2009.09.1.1 PRODUCT DATASHEET AAT4610B SmartSwitchTM Current Limited Load Switch SC70JW-8 2.20 0.20 1.75 0.10 0.50 BSC 0.50 BSC 0.50 BSC 0.225 0.075 2.00 0.20 0.100 7 3 0.45 0.10 4 4 0.05 0.05 0.15 0.05 1.10 MAX 0.85 0.15 0.048REF 2.10 0.30 All dimensions in millimeters. Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611 (c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech's terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. 4610B.2009.09.1.1 www.analogictech.com 11