AAT4644 4-Channel Current Limited Load Switch General Description Features 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 20µA. The AAT4644 is a flexible solution, allowing system designers to gang outputs together for lower RDS(ON) and higher current limit. • • • • 500mA per Channel Steady State 4 x 1A Current Limit Trip Point Over-Temperature Protection Fast Transient Response: — 1µs (Typ) Response to Short Circuit 100mΩ Typical RDS(ON) Under-Voltage Lockout Temperature Range: -40°C to +85°C 8-Pin TSSOP or SOP Package • • • • The AAT4644 is available in a Pb-free, 8-pin TSSOP or SOP package and is specified over the -40°C to +85°C temperature range. SmartSwitch™ Applications • • • Desktop PCs Peripheral Ports USB Ports Typical Application INPUT 3.3V - 5V 2, 7 IN OUT1 AAT4644 OUT2 OUT3 GND OUT4 1 3 8 6 OUTPUT1 OUTPUT2 OUTPUT3 OUTPUT4 4 4644.2006.05.1.2 1 AAT4644 4-Channel Current Limited Load Switch Pin Descriptions Pin # Symbol Function 1 OUT1 2, 7 IN 3 OUT2 Channel 2 output. 4 GND Ground connection. 5 N/C Not internally connected. 6 OUT4 Channel 4 output. 8 OUT3 Channel 3 output. Channel 1 output. These pins are the input supply to the circuit. Pin Configuration SOP-8 (Top View) 1 8 OUT3 2 2 TSSOP-8 (Top View) 7 IN 3 6 OUT4 4 5 N/C OUT1 1 IN 2 OUT2 GND OUT1 1 8 OUT3 IN 2 7 IN OUT2 3 6 OUT4 GND 4 5 N/C 4644.2006.05.1.2 AAT4644 4-Channel Current Limited Load Switch Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Symbol VIN VOUT IOUT TJ VESD TLEAD Description IN to GND OUT to GND Output Current Operating Junction Temperature Range ESD Rating2—HBM Maximum Soldering Temperature (at Leads) Value Units -0.3 to 6 -0.3 to 6 Internally Limited -40 to 85 4000 300 V V A °C V °C Value Units 100 1.25 °C/W W Thermal Characteristics3 Symbol ΘJA PD Description Maximum Thermal Resistance Maximum Power Dissipation 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 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 Min Typ 2.7 VIN = 5V, IOUT = 0 Rising Edge VIN = 5.0V, TA = 25°C Each Output OUT < IN to 1V VIN = 5V 0.6 20 1.75 0.3 100 1.0 1 125 Max Units 5.5 40 V µA V V mΩ A µs °C 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 1.5kΩ resistor into each pin. 3. Mounted on a demo board. 4644.2006.05.1.2 3 AAT4644 4-Channel Current Limited Load Switch Typical Characteristics TA = 25°C, unless otherwise noted. Quiescent Current 25 40 35 Input Current (μA) Quiescent Current (μA) Quiescent Current vs. Temperature 30 25 20 15 10 5 20 15 10 5 0 0 -40 -20 0 20 40 60 80 100 120 0 1 2 Temperature (°C) Current Limit Input and Output Voltage (V) Output Current (A) 1 0.5 0 2 3 6 4 5 8 12 6 8 Input Voltage 4 4 Output Current 2 0 Output Voltage 0 -4 -1 0 1 Output Voltage (V) 2 3 4 5 Time (µs) Short Circuit Through 0.6Ω Thermal Shutdown Response (0.3Ω Load) 8 8 6 Input Voltage 6 4 Output Voltage 4 2 Output Current 2 0 0 -1 0 1 2 Time (µs) 3 4 Output Current (A) Input and Output Voltage (V) 5 Output Current (A) 1.5 1 4 Short Circuit Through 0.3Ω 2 0 3 Input Voltage (V) VIN (5V/div) VOUT (5V/div) IOUT (500mA/ div) 5 -100 0 100 200 300 400 500 Time (µs) 4 4644.2006.05.1.2 AAT4644 4-Channel Current Limited Load Switch Typical Characteristics TA = 25°C, unless otherwise noted. RDS(ON) vs. Temperature 150.0 140.0 RDS(ON) (mΩ) 130.0 VIN = 3V 120.0 110.0 100.0 VIN = 5V 90.0 80.0 70.0 -40 -20 0 20 40 60 80 100 120 Temperature (°C) 4644.2006.05.1.2 5 AAT4644 4-Channel Current Limited Load Switch Functional Block Diagram IN OUT1 Channel 1 Control Current Limit OUT2 Channel 2 Control Current Limit Under-Voltage Lockout OUT3 Over-Temperature Protection Channel 3 Control Current Limit OUT4 Channel 4 Control Current Limit GND 6 4644.2006.05.1.2 AAT4644 4-Channel Current Limited Load Switch Ordering Information Package Marking Part Number (Tape and Reel)1 SOP-8 4644 AAT4644IAS-T1 TSSOP-8 4644 AAT4644IHS-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/pbfree. 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 part numbers listed in BOLD. 4644.2006.05.1.2 7 AAT4644 4-Channel Current Limited Load Switch 6.40 ± 0.20 4.40 ± 0.10 TSSOP-8 12° REF × 4 3.00 ± 0.10 1.05 MAX 0.245 ± 0.055 × 8 1.20 MAX 0.65 BSC 0.145 ± 0.055 4° ± 4° 0.60 ± 0.15 0.10 ± 0.05 DETAIL A 12° 1.00 REF All dimensions in millimeters. © 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