AAT4608 SKYWORKS

Document overview

  • Manufacturer or author: Provided By www.digicamel.com(free datasheet download site)
  • PDF pages: 9

Technical content

Features

  • 2.7V to 5.5V Input Voltage Range
  • Programmable Over-Current Threshold
  • Fast Transient Response: ▪ <1 μs Response to Short Circuit
  • Low Quiescent Current ▪ 15 μA Typical ▪ 1 μA Max With Switch Off
  • 160m  Typical RDS(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 Devices

Current Limited Load Switch in a SOT23 Package Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 Pin Descriptions Pin # Symbol Function 1 OUT P-channel MOSFET drain. Connect 0.47 μF 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 1 μF capacitor from IN to GND. Pin Configuration SOT23-5 (Top View) GND IN N/CSET OUT 1 3 4

Current Limited Load Switch in a SOT23 Package Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at c onditions 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. Absolute Maximum Ratings1 TA = 25°C unless otherwise noted. Symbol Description Value Units VIN IN to GND -0.3 to 6 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 Thermal Characteristics3 Symbol Description Value Units JA Thermal Resistance 150 °C/W PD Power Dissipation 667 mW

Current Limited Load Switch in a SOT23 Package Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012

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 RDS(ON) On Resistance VIN = 5.0V 160 180 mVIN = 4.5V 165 VIN = 3.0V 195 230 ILIM Current Limit R SET = 6.8k 0.5 1 2.0 A ILIM(MIN) Minimum Current Limit 150 mA TRESP Current Limit Response Time V IN = 5V 0.8 μs

Current Limited Load Switch in a SOT23 Package Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. Quiescent Current vs. Temperature -40 -20 0 20 40 60 80 100 120 Temperature (°C) Quiescent Current (μA) Quiescent Current 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Input Current (μA) Output Current vs. Output Voltage (RSET = 16kΩ) 0.2 0.4 0.6 01 23 45 Output Voltage (V) Output Current (A) 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 Short-Circuit Through 0.3Ω 0123 Time (μs) Input and Output Voltage (V) -4 Output Current (A) Output Current Input Voltage Output Voltage 0123 Short-Circuit Through 0.6Ω Time (μs) Input and Output Voltage (V) Output Current (A) Output Current Input Voltage Output Voltage

Current Limited Load Switch in a SOT23 Package Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. RSET vs. ILIM 100 0.1 10 1 ILIM (A) RSET (kΩ) RSET Coefficient vs. ILIM 0 0.5 1 1.5 2 ILIM (A) RSET ILIM Product (kV) Current Limit vs. Temperature (RSET = 22.1kΩ; VIN - VOUT = 0.5V) -50 - 25 0 25 50 75 100 Temperature (°C) Current Limit (%)

Current Limited Load Switch in a SOT23 Package Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 Applications Information Setting Current Limit In most applications, the variation in I LIM must be taken into account when determining R SET. 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 temperature. See charts “Current Limit vs. Temperature,” and “Output Current vs. V OUT.” Together these three factors add up to a ±25% tolerance (see I LIM specification in Electrical Characteristics sec- tion). In the figure below, a cold device with a statisti- cally higher current limit, and a hot device with a statis- tically lower current limit, both with R SET equal to 10.5k, are shown. While the chart, "RSET vs. ILIM” indicates an ILIM of 0.7A with an RSET of 10.5k, this figure shows that the actual current limit will be at least 0.525A, and no great- er than 0.880A. 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 To determine RSET, start with the maximum current drawn by the load and multiply it by 1.33. (Typical_I LIM = minimum_ILIM / 0.75.) This is the typical current limit value. Next, refer to “RSET vs. ILIM” and find the RSET that Functional Block Diagram Current Limit 1.2V Reference Over-Temp Protection OUT SET GND RSET IN Under- voltage Lockout

Current Limited Load Switch in a SOT23 Package Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 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 Figure 1: Overload Operation. corresponds to the typical 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 I LIM RSET product found in the chart “RSET 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. RSET (k) Current Limit (Typ) (mA) Device Will Not Current Limit Below (mA) Device Always Current Limits 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 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 . 10.5k is a standard value that is a little less than 11k  but very close. The chart reads approximately 0.700A as a typical I LIM value for 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 voltage at the output drops. This causes the AAT4608 to dissipate a larger than normal quantity of power, and its die tem- perature to increase. When the die temperature exceeds an over-temperature limit, the AAT4608 will shut down until is has cooled sufficiently, 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 great- er than the voltage on IN, large currents may flow. This could cause damage to the AAT4608.

Current Limited Load Switch in a SOT23 Package Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201915A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 3, 2012 Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. Sky- works may change its documentation, products, services, specifi cations or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for confl icts, incompatibilities, or other diffi culties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided here- under, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, IN- CLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or en- vironmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifi cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design specifi cations. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifi cations or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identifi cation purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.

Ordering Information

Package Marking 1 Part Number (Tape and Reel)2 SOT23-5 CMXYY AAT4608IGV-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

SOT23-54°° ±± 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 dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.