AAT4608 AAT

Document overview

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Technical content

Features

  • 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
  • 160m Ω Typical R DS(ON)
  • Under-Voltage Lockout
  • Thermal Shutdown
  • Temperature Range: -40°C to +85°C
  • 4kV ESD Rating
  • 5-Pin SOT23 Package

Applications

  • Hot Swap Supplies
  • Notebook Computers
  • Peripheral Ports
  • Personal Communication DevicesTypical Application AAT4608 1IN SET INPUT GND GND GND OUT SOT23 OUTPUT 0.47µFRSET1µF

Current Limited Load Switch in SOT23 Package 2 4608.2006.03.1.3 Pin Descriptions Pin Configuration SOT23-5 (Top View) GND IN N/CSET OUT 1 3 4 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 N/C No internal connection. 5 IN P-channel MOSFET source. Connect 1µF capacitor from IN to GND.

TA = 25°C unless otherwise noted. Thermal Characteristics3

Electrical Characteristics

VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at T A = 25°C. Symbol Description Conditions Min Typ Max Units VIN Operation Voltage 2.7 5.5 V IQ Quiescent Current V IN = 5V, IOUT = 0 15 30 µA VUVLO Under-Voltage Lockout Rising Edge, 1% Hysteresis 2.0 2.3 2.7 V VIN = 5.0V 160 180 RDS(ON) On Resistance V IN = 4.5V 165 m Ω VIN = 3.0V 195 230 ILIM Current Limit R SET = 6.8kΩ 0.5 1 2.0 A ILIM(MIN) Minimum Current Limit 150 mA TRESP Current Limit Response Time V IN = 5V 0.8 µs Symbol Description Value Units ΘJA Thermal Resistance 150 °C/W PD Power Dissipation 667 mW Symbol Description Value Units VIN IN to GND -0.3 to 6 V VSET ,VOUT SET, OUT to GND -0.3 to VIN + 0.3 V IMAX Maximum Continuous Switch Current 2 A TJ Operating Junction Temperature Range -40 to 150 °C TLEAD Maximum Soldering Temperature (at Leads) 300 °C VESD ESD Rating2 - HBM 4000 V AAT4608 Current Limited Load Switch in SOT23 Package 4608.2006.03.1.3 3 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi- tions 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 Ω resistor into each pin. 3. Mounted on a demo board.

Unless otherwise noted, VIN = 5V, TA = 25°C. 0123 Short Circuit Through 0.6Ω Time (µs) Input and Output Voltage (V) Output Current (A) Output Voltage Input Voltage Output Current Short Circuit Through 0.3Ω 0123 Time (µs) Input and Output Voltage (V) Output Current (A) Output Voltage Input Voltage Output Current RDS(ON) vs. Temperature 100 150 200 250 -40 -20 0 20 40 60 80 100 Temperature (°C) RDS(ON) (mΩ) Input = 3V Input = 5V Output Current vs. Output Voltage (RSET = 16kΩ) 0.2 0.4 0.6 01 23 45 Output Voltage (V) Output Current (A) Quiescent Current 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Input Current (µA) Quiescent Current vs. Temperature -40 -20 0 20 40 60 80 100 120 Temperature Quiescent Current (µA) (C) AAT4608 Current Limited Load Switch in SOT23 Package 4 4608.2006.03.1.3

Unless otherwise noted, VIN = 5V, TA = 25°C. Current Limit vs. Temperature -50 - 25 0 25 50 75 100 Temperature (°C) Current Limit (%) RSET = 22.1k VIN - VOUT = 0.5V RSET Coefficient vs. ILIM 0 0.5 1 1.5 2 ILIM (A) RSET ILIM Product (kV) RSET vs. ILIM 100 0.1 10 1 ILIM (A) RSET (kΩ) AAT4608 Current Limited Load Switch in SOT23 Package 4608.2006.03.1.3 5

1.2V Reference Under- voltage Lockout Over-Temp Protection OUT SET GND RSET IN AAT4608 Current Limited Load Switch in SOT23 Package 6 4608.2006.03.1.3 Applications Information Setting Current Limit In most applications, the variation in I LIM 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 1), plus the operating tem- perature. See charts "Current Limit vs. Temperature," and "Output Current vs. V OUT." Together these three factors add up to a ±25% tol- erance (see I LIM 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 R SET equal to 10.5kΩ, are shown. While the chart, "R SET vs. ILIM" indicates an I LIM of 0.7A with an R SET of 10.5kΩ, this figure shows that the actual current limit will be at least 0.525A, and no greater than 0.880A. To determine RSET ,start with the maximum current drawn by the load and multiply it by 1.33. (Typical_I LIM = minimum_I LIM / 0.75.) This is the typical current limit value. Next, refer to "R SET vs. ILIM" and find the RSET that corresponds to the typ- Current Limit Using 10.5kΩ 0.2 0.4 0.6 0.8 1.2 01 2345 VOUT (V) ILIM (A) 0.88 A 0.525 A Device with high current limit at -40°C Device with low current limit at 85°C

Current Limited Load Switch in SOT23 Package 4608.2006.03.1.3 7 ical current limit value. Choose the largest resistor available that is less than or equal to it. For greater precision, the value of R SET may also be calculated using the ILIM RSET product found in the chart "RSET coefficient vs. I LIM." 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 Table 1. Table 1: Current Limit RSET Values. 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 11k Ω. 10.5kΩ is a standard value that is a little less than 11k Ω but very close. The chart reads approximately 0.700A as a typical I LIM value for 10.5k Ω. Multiplying 0.700A by 0.75 and 1.25 shows that the AAT4608 will limit the load current to greater than 0.525A, but less than 0.875A. Operation in Current Limit When a heavy load is applied to the output of the AAT4608, the load current is limited to the value of I LIM determined by R SET (see Figure 1). Since the load is demanding more current than I LIM, the volt- age at the output drops. This causes the AAT4608 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 AAT4608 will shut down until is has cooled suf- ficiently, at which point it will start up again. The AAT4608 will continue to cycle on and off until the load (or power) is removed. Reverse Voltage The AAT4608 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 AAT4608. Device Current Device Will Always Limit Not Current Current RSET (Typ) Limit Limits (kΩΩ) (mA) Below (mA) Below (mA) 40.2 200 150 250 30.9 250 188 313 24.9 300 225 375 22.1 350 263 438 19.6 400 300 500 17.8 450 338 563 16.2 500 375 625 14.7 550 413 688 13.0 600 450 750 10.5 700 525 875 8.87 800 600 1000 7.50 900 675 1125 6.81 1000 750 1250 6.04 1100 825 1375 5.49 1200 900 1500 4.99 1300 975 1625 4.64 1400 1050 1750 Figure 1: Overload Operation. Time (s) Output Voltage (V) 0.25 0.5 0.75 Output Current (A) Output Current Output Voltage 1Ω load is turned on at time = 0

Ordering Information

Package Information

All dimensions in millimeters. 4° ± 4° 0.15 ± 0.07 0.45 ± 0.15 0.10 BSC 1.20 ± 0.25 1.575 ± 0.125 2.80 ± 0.20 0.40 ± 0.10 0.60 REF 2.85 ± 0.15

1.90 BSC

0.95 BSC 1.10 ± 0.20 10° ± 5° GAUGE PLANE 0.075 ± 0.075

0.60 REF

All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree. Package Marking 1 Part Number (Tape and Reel)2 SOT23-5 CMXYY AAT4608IGV-T1 AAT4608 Current Limited Load Switch in SOT23 Package 8 4608.2006.03.1.3 Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality con- trol techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.