AAT4610 AAT

Document overview

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  • PDF pages: 10

Technical content

Features

  • Input Voltage Range: 2.7V to 5.5V
  • 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)
  • Only 2.5V Needed for ON/OFF Control
  • Under-Voltage Lockout
  • Thermal Shutdown
  • 4kV ESD Rating
  • UL Approved—File No. E217765
  • 5-Pin SOT23 Package
  • Temperature Range: -40°C to +85°C

Applications

  • Hot Swap Supplies
  • Notebook Computers
  • Peripheral Ports
  • Personal Communication Devices UL Recognized Component Typical Application AAT4610 ON/(ON) IN SET INPUT GND GND GND OUT OUTPUT ON (ON) 0.47μFRSET1μF

Current Limited Load Switch Pin Descriptions Pin Configuration SOT23-5 (Top View) GND IN ONSET 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 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.

Current Limited Load Switch Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Thermal Characteristics3 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 VON ON (ON) to GND -0.3 to V IN + 0.3 V VSET ,VOUT SET, OUT to GND -0.3 to V IN + 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 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.

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, ON (ON) = Active, IOUT = 0 15 30 µA IQ(OFF) Off Supply Current ON (ON) = Inactive, V IN = 5.5V 1 µA ISD(OFF) Off Switch Current ON (ON) = Inactive, V IN = 5.5V, VOUT = 0 0.03 15 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 0.75 1 1.25 A ILIM(MIN) Minimum Current Limit 150 mA VON(L) ON (ON) Input Low Voltage 0.8 V ION(SINK) ON (ON) Input leakage V ON = 5.5V 0.01 1 µA TRESP Current Limit Response Time V IN = 5V 0.8 µs TOFF Turn-Off Time V IN = 5V, RL = 10Ω 0.4 2 µs TON Turn-On Time V IN = 5V, RL = 10Ω 40 200 µs TSD Over-Temperature Threshold V IN =5 V TJ Increasing 125 °CTJ Decreasing 115 AAT4610 Current Limited Load Switch

Unless otherwise noted, VIN = 5V, TA = 25°C. Off-Switch Current vs. Temperature Temperature (°C) Off-Switch Current (µA) 0.001 0.01 0.1 -40 -20 0 20 40 60 80 100 120 Off-Supply Current vs. Temperature 0.01 0.1 -40 -20 0 20 40 60 80 100 1 20 Temperature (°C) Off-Supply Current (µA) 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 vs. Input Voltage 1020 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Input Current (µA) Quiescent Current vs. Temperature 10152025 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Quiescent Current (µA) AAT4610 Current Limited Load Switch

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) -4 Output Current (A) Output Voltage Input Voltage Output Current - 0.5 0 0.5 1 Time (µs) Voltage (V) OutputON Turn Off (RL = 10Ω; IOUT = ILIMIT) Turn On (RL = 10Ω; CL = 0.47µF; IOUT = ILIMIT) - 20 0 20 40 60 Time (µs) Voltage (V) OutputON Turn-Off Time vs. Temperature 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 - 40 - 20 0 20 40 60 80 100 Temperature (°C) Turn-Off Time (µs) VIN = 3V VIN = 5V Turn-On Time vs. Temperature 203040 -4 0 -2 0 0 2 0 4 0 6 0 8 0 1 0 0 Temperature (°C) Turn-On Time (µs) VIN = 5V VIN = 3V AAT4610 Current Limited Load Switch

Unless otherwise noted, VIN = 5V, TA = 25°C. Current Limit vs. Temperature (RSET = 22.1kΩ; VIN - VOUT = 0.5V) -50 - 25 0 25 50 75 100 Temperature (°C) Current Limit (%) 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) AAT4610 Current Limited Load Switch

Current Limited Load Switch Functional Block Diagram Current Limit 1.2V Reference Under- Voltage Lockout Over-Temperature Protection OUT SET GND RSET ON (ON) IN 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 the charts "Current Limit vs. Temperature" and "Output Current vs. V OUT" in the Typical Characteristics section of this datasheet. Together, these three factors add up to a ±25% tol- erance (see I LIM specification in the Electrical Characteristics section of this datasheet). Figure 1 shows a cold device with a statistically higher cur- rent limit, and a hot device with a statistically lower current limit, both with R SET equal to 10.5kΩ. 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. Figure 1: Output Current Using 10.5k ΩΩ. To determine R SET ,start with the maximum current drawn by the load, and multiply it by 1.33 (typi- cal_I LIM = 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 that is less than or equal to it. For greater precision, Ω 0.2 0.4 0.6 0.8 1.2 012345 VOUT (V) ILIM (A) 0.88A 0.525A Device with high current limit at -40°C Device with low current limit at 85°C

the value of RSET may also be calculated using the ILIM RSET product found in the chart "R SET Coefficient vs. I LIM". The maximum current is derived by multiplying the typical current for the chosen R SET 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 "RSET vs. ILIM," RSET should be less than 11kΩ. 10.5 kΩ is a standard value that is a little less than 11kΩ. The chart gives approx- imately 0.700A as a typical I LIM value for 10.5k Ω. Multiplying 0.700A by 0.75 and 1.25 shows that the AAT4610 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 AAT4610, the load current is limited to the value of I LIM determined by R SET (see Figure 2). Since the load is demanding more current than I LIM, the volt- age at the output drops. This causes the AAT4610 to dissipate a larger than normal quantity of power, and results in increased die temperature. When the die temperature exceeds an over-temperature limit, the AAT4610 will shut down until is has cooled suffi- ciently, at which point it will start up again. The AAT4610 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). 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 (Pin 4) of the AAT4610 has low and high threshold volt- ages that accommodate this condition. The thresh- old voltages are compatible with 5V TTL and 2.5V to 5V CMOS. Reverse Voltage The AAT4610 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 damage the AAT4610. AAT4610 Current Limited Load Switch Output Voltage (V) 0.25 0.50.75 Output Current (A) Output Current Output Voltage 1Ω load is turned on at time = 0 Device Will Device Always Current Not Current Current Limits RSET Limit Limit Below Below (kΩΩ) Typ (mA) (mA) (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 2: Overload Operation.

Current Limited Load Switch Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611

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 Package Enable Marking 1 Part Number (Tape and Reel)2 SOT23-5 ON (active low) AAXYY AAT4610IGV-T1 SOT23-5 ON (active high) AWXYY AAT4610IGV-1-T1 1. XYY = assembly and date code. 2. Sample stock is generally held on all 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 sub- ject 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. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and produ ct names appearing in this document are regis- tered trademarks or trademarks of their respective holders.