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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 thermally protected P-channel MOSFETs to protect against short circuits. Each switch's 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 8 pin TSSOP or SOP packages, specified over -40 to 85C. AAT4644 Features * * * * * * * * SmartSwitchTM 500mA per channel steady state 4 X 1A current limit trip point Over-temp protection Fast transient response: * 1s (typ) response to short circuit 100m typical RDS(ON) Undervoltage Lockout Temp range -40 to 85C 8 pin TSSOP or SOP packages Applications * * * USB ports Peripheral ports Desktop PCs Typical Application INPUT 3.3V - 5V 2,7 IN OUT1 1 3 8 6 OUTPUT1 OUTPUT2 OUTPUT3 OUTPUT4 AAT4644 GND 4 OUT2 OUT3 OUT4 4644.2004.04.1.0 1 4-Channel Current Limited Load Switch Pin Descriptions Pin # 1 2, 7 3 4 5 6 8 AAT4644 Symbol OUT1 IN OUT2 GND NC 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 SO-8 (Top View) TSSOP-8 (Top View) OUT1 IN OUT2 GND OUT3 IN OUT4 NC OUT1 IN OUT2 GND 1 2 8 7 3 4 6 5 OUT3 IN OUT4 NC 1 2 1 2 2 4644.2004.04.1.0 4-Channel Current Limited Load Switch Absolute Maximum Ratings Symbol VIN VOUT IOUT TJ VESD TLEAD (TA=25C unless otherwise noted) AAT4644 Description IN to GND OUT to GND Output Current Operating Junction Temperature Range ESD Rating1--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 Note: 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. Note 1: Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. Thermal Characteristics Symbol JA PD Description Maximum Thermal Resistance Maximum Power Dissipation Value 100 1.25 Units C/W W Note 2: Mounted on a demo board. Electrical Characteristics Symbol VIN IQ VUVLO VUVLO(hys) RDS(ON) ILIM tRESP TSD (VIN = 5V, TA = -40 to 85C unless otherwise noted. Typical values are at TA=25C; bold values designate full temperature range) Description Operation Voltage Quiescent Current Undervoltage Lockout Undervoltage 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 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 4644.2004.04.1.0 3 4-Channel Current Limited Load Switch Typical Characteristics (TA = 25C unless otherwise noted) Quiescent Current vs. Temperature Quiescent Current (A) 40 35 30 25 20 15 10 5 0 -40 -20 0 20 40 60 80 100 120 20 25 AAT4644 Quiescent Current Input (A) 15 10 5 0 0 1 2 3 4 5 6 Temperature (C) Input (V) Current Limit 2 Short Circuit Through 0.3 Ohm 8 12 Input and Output (V) Output (A) 1 4 4 0.5 2 Output Current Output Voltage 0 0 0 1 2 3 4 5 0 -1 0 1 2 3 4 5 -4 Output (V) Time (s) Short Circuit Through 0.6 Ohm Input and Output (V) 8 8 Thermal Shutdown Response 0. Vin(5V/div) Output (A) 6 Input Voltage Output Voltage Output Current -1 0 1 2 3 4 5 6 Vout (5V/div) Iout (500mA/ div) -100 0 100 200 300 400 500 4 4 2 2 0 0 Time (s) Time (s) 4 4644.2004.04.1.0 Output (A) 1.5 6 Input Voltage 8 4-Channel Current Limited Load Switch (TA = 25C unless otherwise noted) Rdson vs. Temperature 150.0 140.0 AAT4644 Rdson (m) 130.0 120.0 110.0 100.0 90.0 80.0 70.0 -40 -20 0 20 40 60 80 100 120 VIN=3V VIN=5V Temperature (C) Block Diagram IN Channel 1 Control Current Limit OUT1 OUT2 Undervoltage Lockout Channel 2 Control Current Limit OUT3 Over-Temp Protection Channel 3 Control Current Limit OUT4 Channel 4 Control Current Limit GND 4644.2004.04.1.0 5 4-Channel Current Limited Load Switch Ordering Information Package SOP8 TSSOP8 Marking 4644 4644 Part Number (Tape and Reel) AAT4644IAS-T1 AAT4644IHS-T1 AAT4644 Note: Sample stock is generally held on all part numbers listed in BOLD. Note 1: XYY = assembly and date code. Package Information SOP-8 3.90 0.10 4.90 0.10 6.00 0.20 0.375 0.125 1.55 0.20 45 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. 6 4644.2004.04.1.0 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. 4644.2004.04.1.0 7 4-Channel Current Limited Load Switch AAT4644 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, and advise customers 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. Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 8 4644.2004.04.1.0 |
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