DATA SHEET AAT4618 Current Limited Load Switch General Description Features The AAT4618 SmartSwitch is a member of Skyworks' Application Specific Power MOSFET™ (ASPM™) product family. It is a current limited P-channel MOSFET power switch designed for high-side load switching applications operating with inputs ranging from 2.4V to 5.5V, making it ideal for 2.5V, 3V, and 5V systems. An integrated current-limiting circuit protects the input supply from large currents which may cause the supply to fall out of regulation. In addition, the AAT4618 thermal overload protection limits power dissipation and junction temperatures associated with prolonged periods of operation in current limit. Due to its low RDS(ON), the AAT4618 can be used to control loads that require up to factory preset 400mA, 500mA, or 1A. The ultra-fast current limit response to a sudden short circuit is a mere 400ns which reduces the requirements of local supply bypassing. An open drain FAULT flag signals an over-current or overtemperature condition after a 4ms timeout. Quiescent current is a low 10μA and the supply current decreases to less than 1μA in shutdown mode. • 2.4V to 5.5V Input Voltage Range • Current Limit Trip Threshold Options: ▪ 400mA Min ▪ 500mA Min ▪ 1A Min • Fast Transient Response: ▪ 400ns Response to Short Circuit • Low Quiescent Current: ▪ 10μA Typical ▪ < 1μA with Switch Off • 125m Typical RDS(ON) • FAULT Flag with 4ms Blanking • Under-Voltage Lockout • Thermal Shutdown • Temperature Range: -40°C to +85°C • 4kV ESD Rating • 5-Pin SOT23 or 8-Pin SC70JW Package The AAT4618 is available in a Pb-free 5-pin SOT-23 or a 8-pin SC70JW package and is specified over the -40°C to +85°C temperature range. The AAT4600 series is a family of adjustable and fixed voltage SmartSwitch products with a range of current handling capabilities. Single versions with adjustable current limit (AAT4610, AAT4601) or fixed current limit (AAT4625) are available, as well as dual versions with fixed current limit (AAT4626, AAT4670). Applications • • • • • Hot Swap Supplies Notebook Computers Peripheral Ports Personal Communication Devices USB Ports Typical Application OUTPUT INPUT IN OUT AAT4618 100k FAULT CIN 1μF GND ON (ON) FAULT ON (ON) GND COUT 0.47μF GND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012 1 DATA SHEET AAT4618 Current Limited Load Switch Pin Descriptions Pin # SOT23-5 SC70JW-8 Symbol Function 1 2 3 4 5 5 6, 7, 8 1 2 3, 4 OUT GND FAULT ON (ON) IN P-channel MOSFET drain. Ground connection. Open-drain FAULT output. Enable input: AAT4618 active low, AAT4618-1 active high. P-channel MOSFET source. Pin Configuration SOT23-5 (Top View) 5 IN 2 3 4 ON (ON) FAULT ON (ON) IN IN 1 8 7 2 2 2 1 1 OUT GND FAULT SC70JW-8 (Top View) 3 6 4 5 GND GND GND OUT Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012 DATA SHEET AAT4618 Current Limited Load Switch Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Symbol VIN, FAULT VON VOUT IOUT TJ VESD TLEAD Description IN, FAULT to GND ON (ON) 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 VIN + 1 -0.3 to VIN + 0.3 Internally Limited -40 to 150 4000 300 V V V A °C V °C Value Units 150 667 °C/W mW Thermal Characteristics3 Symbol JA PD Description Maximum Thermal Resistance Maximum Power Dissipation 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 1.5k resistor into each pin. 3. Mounted on a demo board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012 3 DATA SHEET AAT4618 Current Limited Load Switch Electrical Characteristics VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C; bold values denote full temperature range. Symbol Description Conditions Operation Voltage Quiescent Current Off Supply Current Off Switch Current Under-Voltage Lockout Under-Voltage Lockout Hysteresis VIN = 5V, ON (ON) = Active, IOUT = 0 ON (ON) = Inactive, VIN = 5.5V ON (ON) = Inactive, VIN = 5.5V, VOUT = 0 VIN Falling RDS(ON) On Resistance VIN = 5.0V, TA = 25°C VIN = 3.0V, TA = 25°C TCRDS On Resistance Temperature Coefficient VIN IQ IQ(OFF) ISD(OFF) VUVLO VUVLO(hys) ILIM VOUT = VIN to 0.5V VON(L) ON (ON) Input Low Voltage VON(H) ON (ON) Input High Voltage VIN = 2.7V to 5.5V1 VIN = 2.7V to ≤ 4.2V1 VIN = > 4.2V to 5.0V1 VON (ON) = 5.5V VIN = 5V VIN = 5V, RL = 20 VIN = 5V, RL = 20 ISINK = 1mA VFAULT = 5.5V ON (ON) Input Leakage Current Loop Response Turn-Off Time Turn-On Time FAULT Logic Output Low FAULT Logic Output High Leakage Current FAULT Blanking Time Over-Temperature Threshold Typ 2.4 Current Limit ION(SINK) tRESP TOFF TON VFAULTLOW ISINK Tblank TSD Min VIN = 5V AAT4618-0.4 AAT4618-0.5 AAT4618-1.0 10 400 500 1000 0.1 1.9 0.3 125 155 2800 500 750 1500 Max Units 5.5 25 1 1 V V 175 225 m ppm/°C 600 1000 2000 0.8 mA V 2.0 2.4 0.01 400 5 1 0.5 4 125 1 0.4 1 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012 μA ns μs 1. For VIN outside this range, consult Typical ON (ON) Threshold curve. 4 μA V μA ms °C DATA SHEET AAT4618 Current Limited Load Switch Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. Quiescent Current vs. Input Voltage Quiescent Current vs. Temperature 20 Quiescent Current (μA) Quiescent Current (μA) 20 15 10 5 0 -20 0 20 40 60 80 100 10 5 0 0 120 1 3 4 5 Input Voltage (V) Current Limit vs. VOUT RDS(ON) vs. Temperature 220 200 180 160 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 2 Temperature (°C) RDS(ON) (mΩ) Current Limit (A) -40 15 1 2 3 4 5 VIN = 3V 140 120 100 80 60 40 20 0 VOUT (V) 6 VIN = 5V -40 -20 0 20 40 60 80 100 120 Temperature (°C) Off-Switch Current vs. Temperature 1.00 1.00 Off-Switch Current (μA) Off-Supply Current (μA) Off-Supply Current vs. Temperature 0.10 0.01 0.00 -40 0.10 0.01 0.00 -20 0 20 40 60 Temperature (°C) 80 100 120 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012 5 DATA SHEET AAT4618 Current Limited Load Switch Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. Turn-On Turn-Off (RL = 20Ω; CL = 0.47μF) (RL = 20Ω; CL = 0.47μF) 6 5 Voltage (V) 6 5 Voltage (V) 4 ON 3 OUT 2 1 4 ON OUT 3 2 1 0 0 -1 -1 -0.5 0.0 0.5 1.0 1.5 -10 2.0 0 10 Time (μs) Short Circuit Through 0.3Ω 30 40 50 Thermal Shutdown Response 6 12 Input Voltage 5 10 Output Current 4 8 Output Voltage 3 6 2 4 1 2 0 Output Current (A) Input and Output Voltage (V) 20 Time (μs) Output Voltage (5V/div) Output Current (1A/div) 0 -1 0 1 2 3 4 5 Time (μs) Time (50ms/div) ON (ON) Threshold vs. Input Voltage Fault Delay from Short Circuit Output Voltage (5V/div) Output Current (1A/div) FAULT (5V/div) ON (ON) Threshold (V) 2.4 2.2 2 1.8 VON(H) 1.6 1.4 VON(L) 1.2 1 0.8 0.6 0.4 2 Time (1ms/div) 6 2.5 3 3.5 4 4.5 Input Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012 5 5.5 DATA SHEET AAT4618 Current Limited Load Switch Functional Block Diagram IN OUT Under-Voltage Lockout Over-Temperature Protection Current Limit FAULT ON (ON) 4ms Delay GND Functional Description The AAT4618 is a single channel current limited load switch that protects against short circuits by current limiting to a preset level. A patented fast-acting current limit loop limits the current in a fraction of a microsecond and instantly resets to low impedance once the short-circuit condition is removed. The AAT4618 is internally protected from thermal damage by an over-temperature detection circuit. If the die temperature reaches the internal thermal limit, the power device is switched off until the die temperature cools to a level below the thermal limit threshold. The device will thermal cycle indefinitely until the over-current condition is removed. The AAT4618 operates with input voltages ranging from 2.4V to 5.5V which, along with its extremely low operating current, makes it ideal for battery-powered applications. In cases where the input voltage drops below 2.4V, the AAT4618 MOSFET is protected from entering the saturated region of operation by being automatically shut down by an under-voltage lockout circuit. A current limit condition is reported by the open drain FAULT output. A 4ms blanking interval prevents false reporting during the charging of a capacitive load, which typically occurs during device turnon, but may also occur during a port hot plug-in event. The AAT4618 is ideally suited for protection of peripheral ports such as USB, RS232, and parallel ports. Applications Information Input Capacitor The input capacitor CIN protects the power supply from current transients generated by the load attached to the AAT4618. When a short circuit is suddenly applied to the output of the AAT4618, a large current, limited only by the RDS(ON) of the MOSFET, will flow for less than 1μs before the current limit circuitry activates. (See characteristic curve “Short Circuit Through 0.3.") In this event, a moderately sized CIN will dramatically reduce the voltage transient seen by the power supply and by other circuitry upstream from the AAT4618. The extremely fast short-circuit response time of the AAT4618 reduces the size requirement of CIN. CIN should be located as close to the device VIN pin as practically possible. Ceramic, tantalum, or aluminum electrolytic capacitors are appropriate for CIN. There is no specific capacitor ESR requirement for CIN. However, for higher current operation, ceramic capacitors are recommended for CIN due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012 7 DATA SHEET AAT4618 Current Limited Load Switch Output Capacitor Thermal Considerations In order to insure stability while current limit is active, a low capacitance (approximately 0.47μF) is required. No matter how large the output capacitor, output current is limited to the value set by the AAT4618 current limiting circuitry, so very large output capacitors can be used. Since the AAT4618 has internal current limit and overtemperature protection, junction temperature is rarely a concern. However, if the application requires large currents in a hot environment, it is possible that temperature, rather than current limit, will be the dominant regulating condition. In these applications, the maximum current available without risk of an over-temperature condition must be calculated. The maximum internal temperature while current limit is not active can be calculated using Equation 1. For example, USB ports are specified to have at least 120μF of capacitance downstream from their controlling power switch. The current limiting circuit will allow an output capacitance of 1000μF or more without disturbing the upstream power supply. ON (Enable Input) In many systems, power planes are controlled by integrated circuits which run at lower voltages than the power plane itself. The enable input (ON) of the AAT4618 has low and high threshold voltages that accommodate this condition. The threshold voltages are compatible with 5V TTL and 2.5V to 5V CMOS systems. When switching the AAT4618 on into a capacitive load, the AAT4618 will charge the output capacitive load at a rate no greater than the current limit setting. Attaching Loads Capacitive loads attached to an enabled AAT4618 will charge at a rate no greater than the current limit setting. FAULT Output The FAULT flag is provided to alert the system if an AAT4618 load is not receiving sufficient voltage to operate properly. If current limit or over-temperature circuits in any combination are active for more than approximately 4ms, the FAULT flag is pulled to ground through approximately 100. The filtering of voltage or current transients of less than 4ms prevents capacitive loads connected to the AAT4618 output from activating the FAULT flag when they are initially attached. Pull-up resistances of 1k to 100k are recommended. Since FAULT is an open drain terminal, it may be pulled up to any unrelated voltage less than the maximum operating voltage of 5.5V, allowing for level shifting between circuits. 8 Eq. 1: TJ(MAX) = IMAX2 • RDS(ON)(MAX) • RΘJA + TA(MAX) In Equation 1, IMAX is the maximum current required by the load. RDS(ON)(MAX) is the maximum rated RDS(ON) of the AAT4618 at high temperature. RJA is the thermal resistance between the AAT4618 die and the board onto which it is mounted. TA(MAX) is the maximum temperature that the PCB under the AAT4618 would be if the AAT4618 were not dissipating power. Equation 1 can be rearranged to solve for IMAX, as shown in Equation 2. Eq. 2: IMAX = TSD(MIN) - TA(MAX) RDS(ON)(MAX) · RΘJA TSD(MIN) is the minimum temperature required to activate the AAT4618 over-temperature protection. With the typical specification of 125°C, 115°C is a safe minimum value to use. For example, if an application is specified to operate in 50°C environments, the PCB operates at temperatures as high as 85°C. The application is sealed and its PCB is small, causing RJA to be approximately 150 °C/W. Using Equation 2, Eq. 3: IMAX = 115 - 85 = 950mA 220 · 150 The AAT4618 is safe to operate at the minimum current limit level of 500mA at 85°C. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012 DATA SHEET AAT4618 Current Limited Load Switch Ordering Information Package Enable Current Limit Marking1 Part Number (Tape and Reel)2 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 Active Low Active High Active Low Active High Active Low Active High Active Low Active High Active Low Active High 0.5 0.5 1.0 1.0 0.4 0.4 0.5 0.5 1.0 1.0 AVXYY DWXYY EVXYY EIXYY AAT4618IGV-0.5-T1 AAT4618IGV-0.5-1-T1 AAT4618IGV-1.0-T1 AAT4618IGV-1.0-1-T1 AVXYY DWXYY EVXYY EIXYY AAT4618IJS-0.5-T1 AAT4618IJS-0.5-1-T1 AAT4618IJS-1.0-T1 AAT4618IJS-1.0-1-T1 Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Package Information SOT23-5 2.85 ± 0.15 1.90 BSC 0.075 ± 0.075 10°° ± 5°° 0.40 ± 0.10 0.15 ± 0.07 GAUGE PLANE 4°° ± 4°° 1.10 ± 0.20 0.60 REF 1.20 ± 0.25 2.80 ± 0.20 1.575 ± 0.125 0.95 BSC 0.60 REF 0.45 ± 0.15 0.10 BSC All dimensions in millimeters 1. XYY = assembly and date code. 2. Sample stock is generally held on all part numbers listed in BOLD. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012 9 DATA SHEET AAT4618 Current Limited Load Switch SC70JW-8 2.20 ± 0.20 1.75 ± 0.10 0.50 BSC 0.50 BSC 0.50 BSC 0.225 ± 0.075 2.00 ± 0.20 0.100 7° ± 3° 0.45 ± 0.10 4° ± 4° 0.05 ± 0.05 0.15 ± 0.05 1.10 MAX 0.85 ± 0.15 0.048REF 2.10 ± 0.30 All dimensions in millimeters. Copyright © 2012 Skyworks Solutions, Inc. 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Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012