DATA SHEET AAT4616: Ultrahigh Precision Adjustable Current Limited Load Switch with Fault Flag Applications Description The AAT4616 SmartSwitch is a current-limit P-channel MOSFET USB ports power switch designed for high-side load switching applications. Portable products This switch operates with inputs ranging from 2.4 V to 5.5 V, Hot-swap supplies making it ideal for both 3 V and 5 V systems. An integrated, highly accurate current-limit circuit protects the input supply against Notebook computers large currents, which may cause the supply to fall out of Proprietary peripheral ports regulation. Reverse current blocking is provided to protect the load switch from reverse current flows while the device is in shutdown. Features The AAT4616 is also protected from thermal overload, which Input voltage: 2.4 V to 5.5 V limits power dissipation and junction temperature. Current-limit Programmable over-current limit setting: 300 mA to 1.6 A threshold is programmed with a resistor from SET to ground, and 5% current limit precision at 750 mA is adjusted for load levels up to 1.6 A. The ultrafast current limit response to a sudden short circuit is 2 s, which reduces the Fast transient response: 2 s response to short circuit requirements of local supply bypassing. An open-drain FAULT flag Low quiescent current: signals an over-current or over-temperature condition. To prevent 10 A typical while enabled false reporting, a 4 ms time interval is used at startup (charging a 1 A maximum with switch off capacitive load), where fault conditions are not monitored and 130 m typical RDS(ON) reported. Quiescent current is a low 10 A and the supply current decreases to less than 1 A in shutdown mode. Under-voltage lockout (UVLO) The AAT4616 is offered in small Pb-free, 5-pin SOT23-5 and Reverse blocking during disable TDFN22-8 packages, and is specified for operation over the 4 ms fault masking at startup (capacitive load) 40C to +85C ambient temperature range. Fault flag open-drain output A typical application circuit is shown in Figure 1. The pin Active High/Low enable options configuration is shown in Figure 2. Signal pin assignments and functional pin descriptions are provided in Table 1. Over-temperature protection Temperature range: 40 C to +85 C 5-pin SOT23-5 and 8-pin TDFN package (MSL1, 260 C per Skyworks Green products are compliant with JEDEC-J-STD-020) all applicable legislation and are halogen-free. For additional information, refer to Skyworks Denition of Green, document number SQ04-0074. VIN VOUT IN OUT 2.4 V ~ 5.5 V AAT4616 0.47 F 1 F ON/ON 100 k EN/EN SET GND FLT Fault RSET Flag tc79 Figure 1. AAT4616 Typical Application Circuit Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 201940E Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 11, 2013 1 DATA SHEET AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG 1 5 OUT IN 1 8 IN OUT 2 7 IN OUT 2 GND 3 6 SET ON/ON 3 4 SET ON/ON 4 5 GND FLT SOT23-5 TDFN22-8 tc80 Figure 2. AAT4616 Pinout 5-Pin SOT23 and 8-Pin TDFN (Top View) Table 1. AAT4616 Signal Descriptions Pin Name Description SOT23-5 TDFN22-8 Current-limit load switch output (high-side P-channel MOSFET drain). Connect a 0.47 F capacitor from OUT to GND for 1 7, 8 OUT best load transient response. 2 5 GND IC ground connection. 3 6 SET Current-limit set pin. Connect a resistor between this pin and ground to program the desired current limit set point. 4 3 ON/ON Load switch enable input. Active high and active low options are available. 5 1, 2 IN Load switch power supply input pin (high-side P-channel MOSFET source). Bypass with a 1 F capacitor from IN to GND. NA 4 FLT Current-limit fault flag pin, open-drain output, active low signal. Pull up with a 10 k to 100 k resistor. Table 3, and electrical specifications are provided in Table 4. Electrical and Mechanical Specifications Typical performance characteristics of the AAT4616 are illustrated The absolute maximum ratings of the AAT4616 are provided in in Figures 3 through 14. Table 2. The recommended operating conditions are specified in Table 2. AAT4616 Absolute Maximum Ratings (Note 1) Parameter Symbol Minimum Typical Maximum Units IN to GND VIN 0.3 +6.0 V ON/ON, FLT to GND VON, VFLT 0.3 VIN 0.3 V SET, OUT to GND VSET, VOUT 0.3 VIN 0.3 V Maximum DC output current (Note 2) IMAX 2 A Operating junction temperature range TJ 40 +150 C Storage temperature range TSTG 40 +150 C Maximum soldering temperature (at leads) TLEAD 300 C TDFN22-8 74 C/W Thermal resistance JA SOT23-5 220 C/W TDFN22-8 1.35 W Power dissipation (Notes 3 and 4) PD SOT23-5 0.45 W Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device. Note 2: The current rating is based on long-term current density limitations. Note 3: Mounted on an FR4 board. Note 4: Derated 13.5 mW/C for TDFN22-8 package and 4.5 mW/C for SOT23-5 package above 25 C. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 September 11, 2013 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice 201940E