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| 4-Channel Current Limited Load Switch General Description The AAT4644 is a four-channel resettable fuse. It utilizes independent current-limited and thermallyprotected P-channel MOSFETs to protect against short circuits. Current limit is factory programmed at 1A. Additional protection is provided with undervoltage lockout. The switches are turned off when the input voltage drops below a preset level. The quiescent supply current is typically 20A. The AAT4644 is a flexible solution, allowing system designers to gang outputs together for lower RDS(ON) and higher current limit. The AAT4644 is available in a Pb-free, 8-pin TSSOP or SOP package and is specified over the -40C to +85C temperature range. AAT4644 Features * * * * * * * * SmartSwitchTM 500mA per Channel Steady State 4 x 1A Current Limit Trip Point Over-Temperature Protection Fast Transient Response: -- 1s (Typ) Response to Short Circuit 100m Typical RDS(ON) Under-Voltage Lockout Temperature Range: -40C to +85C 8-Pin TSSOP or SOP Package Applications * * * Desktop PCs Peripheral Ports USB Ports Typical Application INPUT 3.3V - 5V 2, 7 IN OUT1 1 3 8 6 OUTPUT1 OUTPUT2 OUTPUT3 OUTPUT4 AAT4644 GND 4 OUT2 OUT3 OUT4 4644.2006.05.1.2 1 4-Channel Current Limited Load Switch Pin Descriptions Pin # 1 2, 7 3 4 5 6 8 AAT4644 Symbol OUT1 IN OUT2 GND N/C OUT4 OUT3 Function Channel 1 output. These pins are the input supply to the circuit. Channel 2 output. Ground connection. Not internally connected. Channel 4 output. Channel 3 output. Pin Configuration SOP-8 (Top View) TSSOP-8 (Top View) OUT1 IN OUT2 GND 1 8 OUT3 IN OUT4 N/C OUT1 IN OUT2 GND 1 2 3 4 8 7 6 5 OUT3 IN OUT4 N/C 1 2 7 2 3 6 4 5 2 4644.2006.05.1.2 4-Channel Current Limited Load Switch Absolute Maximum Ratings1 TA = 25C, unless otherwise noted. Symbol VIN VOUT IOUT TJ VESD TLEAD AAT4644 Description IN to GND OUT to GND Output Current Operating Junction Temperature Range ESD Rating2--HBM Maximum Soldering Temperature (at Leads) Value -0.3 to 6 -0.3 to 6 Internally Limited -40 to 85 4000 300 Units V V A C V C Thermal Characteristics3 Symbol JA PD Description Maximum Thermal Resistance Maximum Power Dissipation Value 100 1.25 Units C/W W Electrical Characteristics VIN = 5V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = 25C; bold values designate full temperature range. Symbol VIN IQ VUVLO VUVLO(HYS) RDS(ON) ILIM tRESP TSD Description Operation Voltage Quiescent Current Under-Voltage Lockout Under-Voltage Lockout Hysteresis On Resistance Current Limit Current Loop Response Over-Temperature Threshold Conditions VIN = 5V, IOUT = 0 Rising Edge VIN = 5.0V, TA = 25C Each Output OUT < IN to 1V VIN = 5V Min 2.7 Typ 20 1.75 0.3 100 1.0 1 125 Max 5.5 40 Units V A V V m A s C 0.6 125 1.5 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. 4644.2006.05.1.2 3 4-Channel Current Limited Load Switch Typical Characteristics TA = 25C, unless otherwise noted. Quiescent Current vs. Temperature Quiescent Current (A) 40 25 AAT4644 Quiescent Current Input Current (A) -40 -20 0 20 40 60 80 100 120 35 30 25 20 15 10 5 0 20 15 10 5 0 0 1 2 3 4 5 6 Temperature (C) Input Voltage (V) Current Limit 2 Short Circuit Through 0.3 Input and Output Voltage (V) 8 12 Output Current (A) Output Current (A) 1.5 6 Input Voltage 8 1 4 4 Output Current 2 0.5 Output Voltage 0 0 0 1 2 3 4 5 0 -1 0 1 2 3 4 5 -4 Output Voltage (V) Time (s) Short Circuit Through 0.6 Input and Output Voltage (V) 8 8 Thermal Shutdown Response (0.3 Load) VIN (5V/div) VOUT (5V/div) Output Current (A) 6 Input Voltage Output Voltage Output Current -1 0 1 2 3 4 5 6 4 4 2 2 0 0 IOUT (500mA/ div) -100 0 100 200 300 400 500 Time (s) Time (s) 4 4644.2006.05.1.2 4-Channel Current Limited Load Switch Typical Characteristics TA = 25C, unless otherwise noted. AAT4644 RDS(ON) vs. Temperature 150.0 140.0 130.0 RDS(ON) (m) 120.0 110.0 100.0 90.0 80.0 70.0 -40 -20 VIN = 3V VIN = 5V 0 20 40 60 80 100 120 Temperature (C) 4644.2006.05.1.2 5 4-Channel Current Limited Load Switch Functional Block Diagram IN Channel 1 Control Current Limit AAT4644 OUT1 OUT2 Under-Voltage Lockout Channel 2 Control Current Limit OUT3 Over-Temperature Protection Channel 3 Control Current Limit OUT4 Channel 4 Control Current Limit GND 6 4644.2006.05.1.2 4-Channel Current Limited Load Switch Ordering Information Package SOP-8 TSSOP-8 Marking 4644 4644 Part Number (Tape and Reel)1 AAT4644IAS-T1 AAT4644IHS-T1 AAT4644 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/pbfree. Package Information SOP-8 3.90 0.10 4.90 0.10 6.00 0.20 0.375 0.125 45 1.55 0.20 0.175 0.075 4 4 0.235 0.045 0.825 0.445 0.42 0.09 x 8 1.27 BSC All dimensions in millimeters. 1. Sample stock is generally held on part numbers listed in BOLD. 4644.2006.05.1.2 7 4-Channel Current Limited Load Switch TSSOP-8 AAT4644 4.40 0.10 6.40 0.20 3.00 0.10 0.65 BSC 12 REF x 4 1.05 MAX 1.20 MAX 0.145 0.055 4 4 0.245 0.055 x 8 0.10 0.05 12 0.60 0.15 1.00 REF DETAIL A All dimensions in millimeters. (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. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech's standard warranty. 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. Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 8 4644.2006.05.1.2 |
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