AAT4644 4-Channel Current Limited Load Switch General Description Features 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 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-temp protection Fast transient response: • 1µs (typ) response to short circuit 100mΩ typical RDS(ON) Undervoltage Lockout Temp range -40 to 85°C 8 pin TSSOP or SOP packages • • • • Preliminary Information The AAT4644 is available in 8 pin TSSOP or SOP packages, specified over -40 to 85°C. SmartSwitch™ Applications • • • USB ports Peripheral ports Desktop PCs Typical Application INPUT 3.3V - 5V 2,7 IN OUT1 AAT4644 OUT2 OUT3 GND OUT4 1 3 8 6 OUTPUT1 OUTPUT2 OUTPUT3 OUTPUT4 4 4644.2002.01.0.92 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 NC 6 OUT4 Channel 4 output 8 OUT3 Channel 3 output Channel 1 output These pins are the input supply to the circuit Not internally connected Pin Configuration SO-8 (Top View) OUT1 IN OUT2 GND 1 2 8 7 2 OUT3 IN OUT4 NC 1 2 2 IN OUT2 GND 1 OUT1 TSSOP-8 (Top View) 3 6 4 5 OUT3 IN OUT4 NC 4644.2002.01.0.92 AAT4644 4-Channel Current Limited Load Switch Absolute Maximum Ratings Symbol (TA=25°C unless otherwise noted) Value Units IN to GND -0.3 to 6 V VOUT OUT to GND -0.3 to 6 V IOUT Output Current Internally Limited A -40 to 85 °C VIN TJ Description Operating Junction Temperature Range VESD ESD Rating1—HBM 4000 V TLEAD Maximum Soldering Temperature (at Leads) 300 °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 1.5kΩ resistor into each pin. Thermal Characteristics Symbol Description Value Units ΘJA Maximum Thermal Resistance 100 °C/W PD Maximum Power Dissipation 1.25 W Note 2: Mounted on a demo board. Electrical Characteristics (VIN = 5V, TA = -40 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 4644.2002.01.0.92 Description Operation Voltage Quiescent Current Undervoltage Lockout Undervoltage 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 -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 3 AAT4644 4-Channel Current Limited Load Switch Typical Characteristics (TA = 25°C unless otherwise noted) Quiescent Current 40 25 35 20 30 Input (µA) 25 20 15 15 10 10 5 5 0 0 -40 -20 0 20 40 60 80 100 120 0 1 2 3 Temperature (°C) 6 Short Circuit Through 0.3 Ohm 2 8 Input and Output (V) Output (A) 5 Input (V) Current Limit 1.5 1 0.5 0 12 Input Voltage 6 8 4 4 Output Current Output Voltage 2 0 0 0 1 2 3 4 5 -4 -1 0 1 Output (V) 2 3 4 5 Time (µs) Thermal Shutdown Response 0. Short Circuit Through 0.6 Ohm 8 8 Vin(5v/div) 6 Input Voltage 6 4 Output Voltage 4 2 2 Output Current 0 Output (A) Input and Output (V) 4 Output (A) Quiescent Current (µA) Quiescent Current vs. Temperature Vout (5A/div) Iout (500mA/ div) 0 -1 0 1 2 Time (µs) 3 4 5 -100 0 100 200 300 400 500 Time (µs) 4 4644.2002.01.0.92 AAT4644 4-Channel Current Limited Load Switch (TA = 25°C unless otherwise noted) Rdson vs. Temperature 150.0 Rdson (mΩ) 140.0 130.0 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) Block Diagram IN OUT1 Channel 1 Control Current Limit, Over-temp OUT2 Channel 2 Control Current Limit, Over-temp Undervoltage Lockout 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 Marking Part Number Bulk Tape and Reel SOP8 AAT4644IAS-B1 AAT4644IAS-T1 TSSOP8 AAT4644IHS-B1 AAT4644IHS-T1 Package Information SOP-8 Dim E H D 7 (4x) A c A2 Q b y 6 e A1 L A A1 A2 B C D E e H L Y θ1 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° 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. 4644.2002.01.0.92 AAT4644 4-Channel Current Limited Load Switch TSSOP-8 Dim E 1 DETAIL A E1 2 D E 0.20 e R1 A2 A A A1 A2 b c D-8 D-28 E E1 e L L1 R R1 θ1 θ2 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° R 1 A1 b 4644.2002.01.0.92 L DETAIL A 2 L1 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