AAT4611 Current Limited Load Switch in SOT-23 Package General Description Features The AAT4611 SmartSwitch™ is a member of AnalogicTech's Application Specific Power MOSFET™ (ASPM™) product family. It is a Current Limited P-channel MOSFET power switch designed for high-side load-switching applications. This switch operates with inputs ranging from 2.7V to 5.5V, making it ideal for both 3V and 5V systems. An integrated current-limiting circuit protects the input supply against large currents which may cause the supply to fall out of regulation. The AAT4611 is also protected from thermal overload which limits power dissipation and junction temperatures. It can be used to control loads that require up to 1 A. Current limit threshold is programmed with a resistor from SET to ground. The quiescent supply current is typically a low 15µA max. In shutdown mode, the supply current decreases to less than 1µA. • • • • • The AAT4611 is available in a 5 pin SOT-23 and 8pin SC70JW specified over -40 to 85°C. Applications • • • • The AAT4600 Series is a family of adjustable and fixed SmartSwitch™ with a range of current handling capabilities. Available are single versions in adj. current limit (AAT4600, AAT4601) as well as in fixed current limit (AAT4602, AAT4625). Dual versions (AAT4620, AAT4626) are also available. 2.7V to 5.5V Input voltage range Programmable over current threshold Fast transient response: <1µs response to short circuit Low quiescent current • 15µA typical • 1µA max with Switch off 160mΩ typical RDS(ON) Only 2.5V needed for ON/OFF Control Undervoltage Lockout Thermal shutdown Temp range -40 to 85°C 4kV ESD Rating 5 pin SOT-23 or SC70JW-8 package Preliminary Information • • • • • • • SmartSwitch™ Peripheral ports Notebook computers Personal communication devices Hot swap supplies Typical Application INPUT 5 IN AAT4611 OUTPUT 1 OUT SOT-23 ON (ON) 3 4 SET ON/(ON) GND 1µF GND 4611.2001.8.0.9 2 RSET 0.47µF GND 1 AAT4611 Current Limited Load Switch in SOT-23 Package Pin Configuration 5-Pin SOT-23 (Top View) OUT 1 GND 2 SET 3 5 IN 4 ON SC70JW-8 (Top View) 1 1 8 7 2 2 OUT GND GND GND 3 6 4 5 IN SET GND ON Pin Descriptions 2 Pin # Symbol Function 1 OUT P-channel MOSFET drain. Connect 0.47µF capacitor from OUT to GND. 2 GND Ground connection 3 SET Current-Limit Set Input. A resistor from SET to ground sets the current limit for the switch. 4 ON Enable Input. Two versions are available, active-high and active-low. See ordering information for details. 5 IN P-channel MOSFET source. Connect 1µF capacitor from IN to GND. 4611.2001.8.0.9 AAT4611 Current Limited Load Switch in SOT-23 Package Absolute Maximum Ratings (TA=25°C unless otherwise noted) Symbol Description VIN VON VSET, VOUT IMAX TJ TLEAD VESD IN to GND ON(ON) to GND SET, OUT to GND Maximum Continuous Switch Current Operating Junction Temperature Range Maximum Soldering Temperature (at Leads) ESD Rating1 - HBM Value Units -0.3 to 6 -0.3 to VIN+0.3 -0.3 to VIN+0.3 2 -40 to 150 300 4000 V V V A °C °C V 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 ΘJA PD Description Thermal Resistance (SOT23-5 or SC70JW-8) Power Dissipation (SOT23-5 or SC70JW-8) Electrical Characteristics Symbol VIN IQ Description IQ(OFF) ISD(OFF) VUVLO Operation Voltage Quiescent Current Off Supply Current Off Switch Current Undervoltage Lockout RDS(ON) On-Resistance ILIM ILIM(MIN) VON(L) Current Limit Minimum Current Limit ON (ON) Input Low Voltage VON(H) ON (ON) Input High Voltage ION(SINK) TRESP TOFF TON ON (ON) Input leakage Current Limit Response Time Turn-Off Time Turn-On Time 4611.2001.8.0.9 Value Units 150 667 °C/W mW (VIN = 5V, TA = 25°C unless otherwise noted.) Conditions Min Typ 2.7 VIN = 5V, ON (ON) = active, IOUT = 0 ON (ON) =inactive, VIN = 5.5V ON (ON) = inactive, VIN = 5.5V, VOUT = 0 Rising edge, 1% hysteresis, VIN=5.0V VIN=4.5V VIN=3.0V RSET = 6.8kΩ VIN=2.7V to 3.6V VIN=4.5V to 5.5V VON = 5.5V VIN=5V VIN=5V, RL=10Ω VIN=5V, RL=10Ω 15 2.0 .75 .03 2.3 160 165 195 1 130 Max Units 5.5 30 1 15 2.7 180 V 230 1.25 195 0.8 2.0 2.4 0.01 0.8 0.4 40 1 2 200 µA µA µA V mΩ mΩ mΩ A mA V V V µA µs µs µs 3 AAT4611 Current Limited Load Switch in SOT-23 Package Typical Characteristics (Unless otherwise noted, VIN = 5V, TA = 25°C) Quiescent Current 25 40 20 Input ( µA ) Quiescent Current (µA) Quiescent Current vs. Temperature 15 10 5 30 20 10 0 -40 -20 0 20 40 60 80 100 120 Temperature (C) 0 2.5 3 3.5 4 4.5 5 5.5 Input ( V ) Output Current vs VOUT RDS(ON) vs. Temperature 250 Input = 3 V 200 RDS(ON) (mΩ) Output Current ( A) 0.6 0.4 RSET =16 kΩ 0.2 150 Input = 5V 100 50 0 0 -40 0 1 2 3 4 -20 0 10 1 0.1 0 20 40 60 Temperature (C ) 4 60 80 100 Off-Switch Current vs. Temperature Off-Switch Current (µA) Off-Supply Current (µA) Off-Supply Current vs. Temperature -20 40 Te mperature (C) Vout ( V ) 0.01 -40 20 5 80 100 120 10 1 0.1 0.01 0.001 -40 -20 0 20 40 60 80 100 120 Temperature (C ) 4611.2001.8.0.9 AAT4611 Current Limited Load Switch in SOT-23 Package (Unless otherwise noted, VIN = 5V, TA = 25°C) Turn-ON vs. Temperature 80 80 70 70 Turn-ON Time (µs) Vin=3V 60 50 40 30 Vin=5V 20 10 Vin=3V 60 50 40 30 Vin=5V 20 10 0 0 - 40 - 20 0 20 40 60 80 100 - 40 - 20 0 Temperature ( C ) 20 6 6 5 I OUT =I LIMIT ON Output Voltage ( V ) Voltage ( V ) 80 100 Turn-Off RL = 10Ω 5 3 2 1 4 IOUT =I LIMIT 3 2 ON 1 Output 0 0 -1 - 20 0 20 40 -1 - 0.5 60 Short Circuit through 0.3Ω Short Circuit through 0.6Ω 8 4 Output Current 4 2 0 Output Voltage 0 -4 1 2 Time (µs) 3 Input and Output (V) Input Voltage 1 8 Output (A) 6 4611.2001.8.0.9 0.5 Time (µs) 12 0 0 Time (µs) 8 Input and Output (V) 60 Temperature ( C ) Turn-On RL = 10Ω, CL = 0.47µF 4 40 9 Input Voltage 6 4 6 3 Output Current 2 0 Output (A) Turn-ON Time (µs) Turn-ON vs. Temperature Output Voltage 0 -3 0 1 2 3 Time (µs) 5 AAT4611 Current Limited Load Switch in SOT-23 Package (Unless otherwise noted, VIN = 5V, TA = 25°C) RSET vs ILIM RSET coefficent vs I LIM 10 R SET I LIM Product ( kV ) R SET (kΩ) 100 10 1 0.1 9 8 7 6 5 1 10 I LIM (A) 0 0.5 1 1.5 2 I LIM (A) Current Limit v. Temperature Current Limit (%) 6% RSET = 22.1k V IN -VOUT=0.5V 4% 2% 0% -2% -4% -6% -50 - 25 0 25 50 75 100 Temperature (C) 6 4611.2001.8.0.9 AAT4611 Current Limited Load Switch in SOT-23 Package Functional Block Diagram IN OUT Undervoltage Lockout Over-Temp Protection ON (ON) 1.2V Reference Current Limit SET RSET GND 4611.2001.8.0.9 7 AAT4611 Current Limited Load Switch in SOT-23 Package Applications Information Setting Current Limit In most applications, the variation in ILIM must be taken into account when determining RSET. The ILIM variation is due to processing variations from part to part, as well as variations in the voltages at IN (pin 5) and OUT (pin 3), plus the operating temperature. See charts "Current Limit vs. Temperature", and "Output Current vs. VOUT". Together these three factors add up to a ±25% tolerance (see ILIM specification in Electrical Characteristics section). In the figure below, a cold device with a statistically higher current limit, and a hot device with a statistically lower current limit, both with RSET equal to 10.5kΩ are shown. While the chart, "RSET vs. ILIM" indicates an ILIM of 0.7A with an RSET of 10.5kΩ , this figure shows that the actual current limit will be at least 0.525A, and no greater than 0.880A. Current Limit Using 10.5 kΩ 1.2 Device with high current limit at -40 C 0.88 A 1 I LIM (A) 0.8 0.6 0.525 A 0.4 Device with low current limit at 85 C 0.2 0 0 1 2 3 4 5 Vout (V ) To determine RSET, start with the maximum current drawn by the load, and multiply it by 1.33. (typical_ILIM = minimum_ILIM / 0.75) This is the typical current limit value. Next, refer to "RSET vs. ILIM" and find the RSET that corresponds to the typical current limit value. Choose the largest resistor available 8 that is less than or equal to it. For greater precision, the value of RSET may also be calculated using the ILIM RSET product found in the chart "RSET coefficient vs. ILIM". The maximum current is derived by multiplying the typical current for the chosen RSET in the chart by 1.25. A few standard resistor values are listed in the table "Current Limit RSET Values". Current Limit RSET Values RSET (kΩ ) 40.2 30.9 24.9 22.1 19.6 17.8 16.2 14.7 13.0 10.5 8.87 7.50 6.81 6.04 5.49 4.99 4.64 Current Device will Limit typ not current (mA) limit below: (mA) 200 150 250 188 300 225 350 263 400 300 450 338 500 375 550 413 600 450 700 525 800 600 900 675 1000 750 1100 825 1200 900 1300 975 1400 1050 Device always current limits below: (mA) 250 313 375 438 500 563 625 688 750 875 1000 1125 1250 1375 1500 1625 1750 Example: A USB port requires 0.5A. 0.5A multiplied by 1.33 is 0.665A. From the chart named "RSET vs. ILIM", RSET should be less than 11kΩ. 10.5 kΩ is a standard value that is a little less than 11kΩ but very close. The chart reads approximately 0.700A as a typical ILIM value for 10.5kΩ. Multiplying 0.700A by 0.75 and 1.25 shows that the AAT4611 will limit the load current to greater than 0.525A but less than 0.875A. 4611.2001.8.0.9 AAT4611 Current Limited Load Switch in SOT-23 Package Overload Operation 1 0.75 0.25 0 5 Output Current 4 3 1Ω load is turned on at time = 0 Output (A) Output ( V ) 0.5 Output Voltage 2 1 0 -0.05 0 0.05 0.1 0.15 0.2 0.25 0.3 Tim e ( s ) Operation in Current Limit Enable Input When a heavy load is applied to the output of the AAT4611, the load current is limited to the value of ILIM determined by RSET. See the figure "Overload Operation". Since the load is demanding more current than ILIM, the voltage at the output drops. This causes the AAT4611 to dissipate a larger than normal quantity of power, and its die temperature to increase. When the die temperature exceeds an over temperature limit, the AAT4611 will shut down until is has cooled sufficiently, at which point it will startup again. The AAT4611 will continue to cycle on and off until the load is removed, power is removed, or until a logic high level is applied to ON (pin 4). In many systems, power planes are controlled by integrated circuits which run at lower voltages than the power plane itself. The enable input ON (pin 4) of the AAT4611 has low and high threshold voltages that accommodate this condition. The threshold voltages are compatible with 5 volt TTL, and 2.5 volt to 5 volt CMOS. 4611.2001.8.0.9 Reverse Voltage The AAT4611 is designed to control current flowing from IN to OUT. If a voltage is applied to OUT which is greater than the voltage on IN, large currents may flow. This could cause damage to the AAT4611. 9 AAT4611 Current Limited Load Switch in SOT-23 Package Package Information SOT-23-5 e Dim S1 H E D A A1 S c I b L A A1 A2 b c D E e H L S S1 Θ Millimeters Min Max 0.95 1.45 0.05 0.15 0.90 1.30 0.35 0.50 0.08 0.20 2.84 3.00 1.50 1.70 1.90 2.60 3.00 0.35 0.55 0.47 0.55 .95 0° 10° Inches Min Max 0.037 0.057 0.002 0.006 0.035 0.051 0.014 0.019 0.003 0.078 0.112 0.112 0.059 0.067 0.0748 0.102 0.118 .0137 .0216 0.019 .0216 0.037 0° 10° Millimeters Min Max 2.10 BSC 1.75 2.00 0.23 0.40 1.10 0 0.10 0.70 1.00 2.00 BSC 0.50 BSC 0.15 0.30 0.10 0.20 0 8º 4º 10º Inches Min Max 0.083 BSC 0.069 0.079 0.009 0.016 0.043 0.004 0.028 0.039 0.079 BSC 0.020 BSC 0.006 0.012 0.004 0.008 0 8º 4º 10º SC70JW-8 e e e Dim E b D 0.048REF c A2 A E E1 L A A1 A2 D e b c Θ Θ1 A1 Θ1 10 L E1 Θ 4611.2001.8.0.9 AAT4611 Current Limited Load Switch in SOT-23 Package Ordering Information Package Enable SOT-23-5 Marking Part Number Bulk Tape and Reel ON (active low) N/A AAT4611IGV-T1 SOT-23-5 ON (active high) N/A AAT4611IGV-1-T1 SC70JW-8 ON (active low) N/A AAT4611IJS-T1 SC70JW-8 ON (active high) N/A AAT4611IJS-1-T1 4611.2001.8.0.9 11 AAT4611 Current Limited Load Switch in SOT-23 Package 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 12 4611.2001.8.0.9