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| AAT4644 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. 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 Preliminary Information 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 4644.2002.01.0.92 1 AAT4644 4-Channel Current Limited Load Switch Pin Descriptions Pin # 1 2, 7 3 4 5 6 8 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 4644.2002.01.0.92 AAT4644 4-Channel Current Limited Load Switch Absolute Maximum Ratings Symbol VIN VOUT IOUT TJ VESD TLEAD (TA=25C unless otherwise noted) 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 4644.2002.01.0.92 3 AAT4644 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 20 25 Quiescent Current Input (A) -40 -20 0 20 40 60 80 100 120 15 10 5 0 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 6 Vout (5A/div) 4 4 2 2 Iout (500mA/ div) -100 0 100 200 300 400 500 0 -1 0 1 2 3 4 5 0 Time (s) Time (s) 4 4644.2002.01.0.92 Output (A) 1.5 6 Input Voltage 8 AAT4644 4-Channel Current Limited Load Switch (TA = 25C unless otherwise noted) Rdson vs. Temperature 150.0 140.0 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, Over-temp OUT1 OUT2 Undervoltage Lockout Channel 2 Control Current Limit, Over-temp OUT3 Channel 3 Control Current Limit, Over-temp OUT4 Channel 4 Control Current Limit, Over-temp GND 4644.2002.01.0.92 5 AAT4644 4-Channel Current Limited Load Switch Ordering Information Package SOP8 TSSOP8 Marking Part Number Bulk AAT4644IAS-B1 AAT4644IHS-B1 Tape and Reel AAT4644IAS-T1 AAT4644IHS-T1 Package Information SOP-8 Millimeters Min Max 1.35 1.75 0.10 0.25 1.45 0.33 0.51 0.19 0.25 4.80 5.00 3.80 4.00 1.27 5.80 6.20 0.40 1.27 0.00 0.10 0 8 Inches Min Max 0.053 0.069 0.004 0.010 0.057 0.013 0.020 0.007 0.010 0.189 0.197 0.150 0.157 0.050 0.228 0.244 0.016 0.050 0.000 0.004 0 8 Dim A A1 A2 B C D E e H L Y 1 EH D 7 (4x) A A2 Q c b y e A1 L Note: 1. PACKAGE BODY SIZES EXCLUDE MOLD FLASH PROTRUSIONS OR GATE BURRS. 2. TOLERANCE 0.1000mm (4mil) UNLESS OTHERWISE SPECIFIED 3. COPLANARITY: 0.1000mm 4. DIMENSION L IS MEASURED IN GAGE PLANE. 5. CONTROLLING DIMENSION IS MILLIMETER; CONVERTED INCH DIMENSIONS ARE NOT NECESSARILY EXACT. 6 4644.2002.01.0.92 AAT4644 4-Channel Current Limited Load Switch TSSOP-8 Millimeters Min Max 1.05 1.20 0.05 0.15 1.05 0.25 0.30 0.127 2.90 3.10 9.60 9.80 4.30 4.50 6.20 6.60 0.65 BSC 0.50 0.70 1.0 0.09 0.09 0 8 Inches Min Max 0.041 0.047 0.002 0.006 0.041 0.010 0.012 0.005 0.114 0.122 0.378 0.386 0.170 0.177 0.244 0.260 0.025 BSC 0.20 0.028 0.039 0.004 0.004 0 8 12 Dim A A1 A2 b c D-8 D-28 E E1 e L L1 R R1 1 2 E E1 DETAIL A 1 2 D E 0.20 e R1 A2 A R 1 A1 b DETAIL A 2 L L1 4644.2002.01.0.92 7 AAT4644 4-Channel Current Limited Load Switch This page intentionally left blank. Advanced Analogic Technologies, Inc. 1250 Oakmead Parkway, Suite 310, Sunnyvale, CA 94086 Phone (408) 524-9684 Fax (408) 524-9689 8 4644.2002.01.0.92 |
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