AAT4250 SKYWORKS | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 13
Technical content
Features
- 1.8V to 5.5V Input Voltage Range
- 120m W (5V) Typical RDS(ON)
- Low Quiescent Current: ▪ Typical 2µA ▪ Typical 0.1µA with Enable Off
- Only 2.0V Needed for ON/OFF Control
- Temperature Range: -40°C to +85°C
- 5kV ESD Rating
- SOT23-5 or SC70JW-8 Package
Applications
- Hot Swap Supplies
- Notebook Computers
- Personal Communication Devices Typical Application AAT4250 ON/OFF IN OUT GND ON 1µF0 .1µF INPUT GND GND CIN COUT OUTPUT
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 Pin Descriptions Pin # Symbol FunctionSOT23-5 SC70JW-8 1 1 OUT P-channel MOSFET drain. 2 2, 3, 4, 5 GND Ground connection. 3 N/A N/C Not internally connected. 4 6 ON/OFF Active-high enable input. Logic high turns the switch on. 5 7, 8 IN P-channel MOSFET source. Pin Configuration SOT23-5 (SOT25) SC70JW-8 (Top View) (Top View) GND IN ON/OFFN/C OUT 1 3 4 GND GND GN D IN IN ON/OFF GND OUT 1
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 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 W resistor into each pin. 3. Mounted on an AAT4250 demo board in still 25ºC air. Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Symbol Description Value Units VIN IN to GND -0.3 to 6 V VON ON/OFF to GND -0.3 to 6 V VOUT OUT to GND -0.3 to VIN + 0.3 V IMAX Maximum Continuous Switch Current 1.7 A IDM Maximum Pulsed Current IN ≥ 2.5V 4 AIN < 2.5V 2 TJ Operating Junction Temperature Range -40 to 150 °C TLEAD Maximum Soldering Temperature (at leads) 300 °C VESD ESD Rating2 - HBM 5000 V Thermal Characteristics3 Symbol Description Value Units θJA Thermal Resistance SC70JW-8 150 °C/WSOT23-5 233.4 PD Power Dissipation SC70JW-8 667 mWSOT23-5 428
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 1. Part requires minimum start-up of VIN ≥ 2.0V to ensure operation down to 1.8V. 2. For VIN outside this range, consult typical ON/OFF threshold curve.
Electrical Characteristics
VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are T A = 25°C. Symbol Description Conditions Min Typ Max Units VIN Operation Voltage 1.81 5.5 V IQ Quiescent Current VIN = 5V, ON/OFF = VIN, IOUT = 0 2 4 µA IQ(OFF) Off Supply Current ON/OFF = GND, VIN = 5V, OUT Open 1 µA ISD(OFF) Off Switch Current ON/OFF = GND, VIN = 5V, VOUT = 0 0.1 1 µA VUVLO Under-Voltage Lockout VIN Falling 1.0 1.5 1.8 V VUVLO(hys) Under-Voltage Lockout Hysteresis 250 mV RDS(ON) On Resistance VIN = 5V, TA = 25°C 120 175 mWVIN = 3V, TA = 25°C 135 200 VIN = 1.8V 165 TCRDS On Resistance Temperature Coefficient 2800 ppm/°C VIL ON/OFF Input Logic Low Voltage VIN = 2.7V to 5.5V2 0.8 V ISINK ON Input Leakage VON = 5V 0.01 1 µA TD Output Turn-On Delay Time 300 µs TDOFF Turn-Off Delay Time VIN = 5V, RLOAD = 10W 10 µsVIN = 3V, RLOAD = 5W 10 TON Turn-On Rise Time VIN = 5V, RLOAD = 16.5W, TA = 0 to 50°C 1000 µsVIN = 5V, RLOAD = 10W, COUT = 0.1µF 1500 VIN = 3V, RLOAD = 5W, COUT = 0.1µF 1500
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. Quiescent Current vs. Temperature 0.5 1.5 2.5 3.5 -40- 20 02 04 06 08 0 100 Temperature (°C) Quiescent Current (µA) VIN = 3V VIN = 5V Quiescent Current vs. Input Voltage 0.5 1.5 2.5 3.5 01 2 3456 Quiescent Current (µA) Input Voltage (V) Off-Supply Current vs. Temperature 100 1000 -40- 20 02 04 06 08 0 100 Temperature (°C) Off-Supply Current (nA) Off-Switch Current vs. Temperature 100 1000 10000 -40- 20 02 04 06 08 0 100 Temperature (°C) Off-Switch Current (nA) Turn-Off Time vs. Temperature (CIN = 1µF; COUT = 0.1µF) -40- 20 02 04 06 08 0 100 Temperature (°C) Turn-Off Time (µs) VIN = 5V RLOAD = 10Ω VIN = 3V RLOAD = 5Ω Turn-On Time vs. Temperature (CIN = 1µF; COUT = 0.1µF) 0.5 1.0 1.5 2.0 2.5 3.0 -40- 20 02 04 06 08 0 100 Temperature (°C) Turn-On Time (ms) VIN = 5V RLOAD = 10ΩVIN = 3V RLOAD = 5Ω
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. Voltage (V) -1 01 23 4 0.5 1.5 Time (ms) Turn-On Waveforms (CIN = 1µF; COUT = 0.1µF; VIN = 3V) V(ON/OFF) VOUT IIN Current (A) Voltage (V) -1 01 23 4 1.2 Time (ms) Turn-On Waveforms (CIN = 1µF; COUT = 0.1µF; VIN = 5V) VOUT 0.8 0.6 0.4 0.2 IIN Current (A) V(ON/OFF) Voltage (V) -1 01 23 4 0.5 1.5 Time (ms) Turn-On Waveforms (CIN = 1µF; COUT = 10µF; VIN = 3V) VOUT Current (A) V(ON/OFF) IIN -1 01 23 4 1.2 Time (ms) Turn-On Waveforms (CIN = 1µF; COUT = 10µF; VIN = 5V) VOUT 0.8 0.6 0.4 0.2 IIN Voltage (V) Current (A) V(ON/OFF) Turn-Off Waveforms (CIN = 1µF; COUT = 1µF; VIN = 3V) Time (µs) -1 13 57 91 11 31 5 VOUT Voltage (V)V(ON/OFF) Turn-Off Waveforms (CIN = 1µF; COUT = 1µF; VIN = 5V) Time (µs) -1 13 57 91 11 31 5 VOUT Voltage (V) V(ON/OFF)
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. RDS(ON) vs. Temperature 120 110 100 150 140 130 160 -40- 20 02 04 06 08 0 100 Temperature (°C) RDS(ON) (mΩ ) VIN = 3V VIN = 5V RDS(ON) vs. Input Voltage 110 120 130 140 150 160 170 180 190 Input Voltage (V) RDS(ON) (mΩ) IOUT = 100mA Typical ON/OFF Threshold vs. Input Voltage 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 Input Voltage (V) ON/OFF Threshold VIH VIL
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 Functional Description The AAT4250 is a slew rate controlled P-channel MOSFET power switch designed for high-side load switching appli- cations. It operates with input voltages ranging from 1.8V to 5.5V which, along with its extremely low operat- ing current, makes it ideal for battery-powered applica - tions. In cases where the input voltage drops below 1.8V, the AAT4250 MOSFET is protected from entering the saturated region of operation by automatically shutting down. In addition, the TTL compatible ON/OFF pin makes the AAT4250 an ideal level-shifted load switch. The slew rate controlling feature eliminates inrush current when the MOSFET is turned on, allowing the AAT4250 to be used with a small input capacitor, or no input capacitor at all. During slewing, the current ramps linearly until it reaches the level required for the output load condition. The proprietary control method works by careful control and monitoring of the MOSFET gate voltage. When the device is switched ON, the gate voltage is quickly increased to the threshold level of the MOSFET. Once at this level, the current begins to slew as the gate voltage is slowly increased until the MOSFET becomes fully enhanced. Once it has reached this point, the gate is quickly increased to the full input voltage and R DS(ON) is minimized. Applications Information Input Capacitor A 1µF or larger capacitor is typically recommended for CIN in most applications. A C IN capacitor is not required for basic operation; however, it is useful in preventing load transients from affecting upstream circuits. C IN should be located as close to the device VIN pin as practi- cally possible. Ceramic, tantalum, or aluminum electro - lytic capacitors may be selected for C IN. There is no specific capacitor equivalent series resistance (ESR) requirement for C IN. However, for higher current opera - tion, 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. Output Capacitor For proper slew operation, a 0.1µF capacitor or greater is required between VOUT and GND. Likewise, with the output capacitor, there is no specific capacitor ESR requirement. If desired, C OUT may be increased without limit to accommodate any load tran - sient condition without adversely affecting the slew rate. Functional Block Diagram Under- V oltage Lockout Level Shift Slew Rate Control IN ON/OFF GND OUT
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 Enable Function The AAT4250 features an enable / disable function. This pin (ON) is active high and is compatible with TTL or CMOS logic. To assure the load switch will turn on, the ON control level must be greater than 2.0V. The load switch will go into shutdown mode when the voltage on the ON pin falls below 0.8V. When the load switch is in shutdown mode, the OUT pin is tri-stated, and quiescent current drops to leakage levels below 1µA. Reverse Output-to-Input Voltage Conditions and Protection Under normal operating conditions, a parasitic diode exists between the output and input of the load switch. The input voltage should always remain greater than the output load voltage, maintaining a reverse bias on the internal parasitic diode. Conditions where V OUT might exceed VIN should be avoided since this would forward bias the internal parasitic diode and allow excessive cur- rent flow into the V OUT pin, possibly damaging the load switch. In applications where there is a possibility of V OUT exceeding V IN for brief periods of time during normal operation, the use of a larger value C IN capacitor is highly recommended. A larger value of C IN with respect to COUT will effect a slower C IN decay rate during shut - down, thus preventing VOUT from exceeding VIN. In appli- cations where there is a greater danger of V OUT exceed- ing VIN for extended periods of time, it is recommended to place a Schottky diode from V IN to V OUT (connecting the cathode to V IN and anode to V OUT). The Schottky diode forward voltage should be less than 0.45V. Thermal Considerations and High Output Current Applications The AAT4250 is designed to deliver a continuous output load current. The limiting characteristic for maximum safe operating output load current is package power dis- sipation. In order to obtain high operating currents, careful device layout and circuit operating conditions must be taken into account. The following discussions will assume the load switch is mounted on a printed circuit board utilizing the mini - mum recommended footprint as stated in the Printed Circuit Board Layout Recommendations section of this datasheet. At any given ambient temperature (T A), the maximum package power dissipation can be determined by the fol- lowing equation: PD(MAX) = TJ(MAX) - TA θJA Constants for the AAT4250 are maximum junction tem - perature (TJ(MAX) = 125°C) and package thermal resis - tance (θJA = 150°C/W). Worst case conditions are calcu- lated at the maximum operating temperature, T A = 85°C. Typical conditions are calculated under normal ambient conditions where T A = 25°C. At T A = 85°C, PD(MAX) = 267mW. At TA = 25°C, PD(MAX) = 667mW. The maximum continuous output current for the AAT4250 is a function of the package power dissipation and the RDS of the MOSFET at T J(MAX). The maximum R DS of the MOSFET at T J(MAX) is calculated by increasing the maxi - mum room temperature R DS by the R DS temperature coefficient. The temperature coefficient (TC) is 2800ppm/ °C. Therefore, at 125°C: RDS(MAX) = RDS(25°C) · (1 + TC · DT) RDS(MAX) = 224mW For maximum current, refer to the following equation: IOUT(MAX) < PD(MAX) RDS For example, if V IN = 5V, R DS(MAX) = 224m W, and T A = 25°C, IOUT(MAX) = 1.7A. If the output load current were to exceed 1.7A or if the ambient temperature were to increase, the internal die temperature would increase and the device would be damaged. Higher peak currents can be obtained with the AAT4250. To accomplish this, the device thermal resistance must be reduced by increasing the heat sink area or by oper - ating the load switch in a duty-cycle manner. Duty cycles with peaks less than 2ms in duration can be considered using the method below.
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 High Peak Output Current Applications Some applications require the load switch to operate at a continuous nominal current level with short duration, high-current peaks. Refer to the I DM specification in the maximum pulsed current rating is not exceeded. The duty cycle for both output current levels must be taken into account. To do so, first calculate the power dissipa - tion at the nominal continuous current level, and then add the additional power dissipation due to the short duration, high-current peak scaled by the duty factor. For example, a 4V system using an AAT4250 operates at a continuous 100mA load current level and has short 2A current peaks, as in a GSM application. The current peak occurs for 576µs out of a 4.61ms period. First, the current duty cycle is calculated: % Peak Duty Cycle: X/100 = 576µs/4.61ms % Peak Duty Cycle = 12.5% The load current is 100mA for 87.5% of the 4.61ms period and 2A for 12.5% of the period. Since the Electrical Characteristics do not report R DS(MAX) for 4V operation, it must be approximated by consulting the chart of R DS(ON) vs. V IN. The R DS reported for 5V R DS can be scaled by the ratio seen in the chart to derive the RDS for 4V VIN: 175mW · 120mW/115mW = 183mW. Derated for temperature: 183m W · (1 + 0.002800 · (125°C - 25°C)) = 235m W. The power dissipation for a 100mA load is calculated as follows: PD(MAX) = I2OUT · RDS PD(100mA) = (100mA)2 · 235mW PD(100mA) = 2.35mW PD(87.5%D/C) = %DC · PD(100mA) PD(87.5%D/C) = 2.1mW The power dissipation for 100mA load at 87.5% duty cycle is 2.1mW. Now the power dissipation for the remaining 12.5% of the duty cycle at 2A is calculated: PD(MAX) = I2OUT · RDS PD(2A) = (2A)2 · 235mW PD(2A) = 940mW PD(12.5%D/C) = %DC · PD(2A) PD(12.5%D/C) = 117.5mW The power dissipation for 2A load at 12.5% duty cycle is 117mW. Finally, the two power figures are summed to determine the total true power dissipation under the varied load. PD(total) = PD(100mA) + PD(2A) PD(total) = 2.1mW + 117.5mW PD(total) = 120mW The maximum power dissipation for the AAT4250 oper - ating at an ambient temperature of 85°C is 267mW. The device in this example will have a total power dissipation of 120mW. This is well within the thermal limits for safe operation of the device; in fact, at 85°C, the AAT4250 will handle a 2A pulse for up to 28% duty cycle. At lower ambient temperatures, the duty cycle can be further increased. Printed Circuit Board Layout Recommendations For proper thermal management, and to take advantage of the low RDS(ON) of the AAT4250, a few circuit board lay- out rules should be followed: V IN and V OUT should be routed using wider than normal traces, and GND should be connected to a ground plane. For best performance, CIN and COUT should be placed close to the package pins. Evaluation Board Layout The AAT4250 evaluation layout follows the printed circuit board layout recommendations, and can be used for good applications layout. Note: Board layout shown is not to scale.
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.
Ordering Information
Package Marking1 Part Number (Tape and Reel)2 SOT23-5 (SOT25) ACXYY AAT4250IGV-T1 SC70JW-8 ACXYY AAT4250IJS-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 (SOT25) 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 dimensions in millimeters.
Slew Rate Controlled Load Switch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202227A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 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 for errors or omissions in these materials or the information contained herein. Sky - works may change its documentation, products, services, specifications 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 conflicts, incompatibilities, or other difficulties 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 specifications as a result of design defects, errors, or operation of products outside of pub- lished parameters or design specifications. 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 specifications 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 identification 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. SC70JW-8 0.225 ± 0.075 0.45 ± 0.10 0.05 ± 0.05 2.10 ± 0.30 2.00 ± 0.20 7° ± 3° 4° ± 4° 0.15 ± 0.05
1.10 MAX
0.100 2.20 ± 0.20 0.048REF 0.50 BSC 0.50 BSC 0.50 BSC All dimensions in millimeters.