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PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
General Description
The AAT4282A SmartSwitchTM is a member of AnalogicTech's Application Specific Power MOSFETTM (ASPMTM) product family. The AAT4282A is a dual P-channel MOSFET power switch designed for high-side load-switching applications. Each MOSFET has a typical RDS(ON) of 60m, allowing increased load switch current handling capacity with a low forward voltage drop. The device is available in three different versions with flexible turn-on and turn-off characteristics - from very fast to slew-rate limited. The standard 4282A (-1) version has a slew-rate limited turn-on load switch. The AAT4282A (-2) version features fast turn-on capability, typically less than 500ns turn-on and 3s turn-off times. The AAT4282A (-3) variation offers a shutdown load discharge circuit to rapidly turn off a load circuit when the switch is disabled. An additional feature is a slew-rate selector pin which can switch between fast and slow slew rate. All the AAT4282A load switch versions are designed to operate from 1.5V up to 6.5V, making them ideal for both 3V and 5V systems. Input logic levels are TTL and 2.5V to 5V CMOS compatible. The quiescent supply current is a very low 1A. The AAT4282A is available in the Pb-free, low profile 2.0x2.0mm FTDFN22-8 package and is specified over the -40 to 85C temperature range.
Slew Rate Controlled Load Switch
Features
* VIN Range: 1.5V to 6.5V * Low RDS(ON) 60m Typical @ 5V 140m Typical @ 1.5V * Slew Rate Turn-On Time Options 1ms 0.5s 100s * Fast Shutdown Load Discharge Option * Low Quiescent Current Typically 1A * TTL/CMOS Input Logic Level * Temperature Range -40C to 85C * FTDFN22-8 Package
Applications
* * * * * * * * Cellular Telephones Digital Still Cameras Hotswap Supplies Notebook Computers PDA Phones PDAs PMPs Smartphones
Typical Application
INA INA OUTA OUTA
INB
ON/OFF
INB
OUTB
OUTB
ENA
AAT4282A
C3 0.1F C4 0.1F
C1 1F
C2 1F
ON/OFF
ENB FAST GND
FAST/SLOW
N/C
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PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Pin Descriptions
Pin #
1 2 3 4 5 6 7 8
Slew Rate Controlled Load Switch
Symbol
INA ENA ENB INB OUTB GND FAST OUTA
Function
This is the pin to the P-channel MOSFET source for Switch A. Bypass to ground through a 1F capacitor. INA is independent of INB Active-High Enable Input A. A logic low turns the switch off and the device consumes less than 1A of current. Logic high resumes normal operation. Active-High Enable Input B. A logic low turns the switch off and the device consumes less than 1A of current. Logic high resumes normal operation. This is the pin to the P-channel MOSFET source for Switch B. Bypass to ground through a 1F capacitor. INB is independent of INA. This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1F capacitor. Ground connection Active-high input Switches between FAST (Logic H) and SLOW (Logic L) Slew rate This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1F capacitor.
Pin Configuration
FTDFN22-8 (Top View)
INA ENA ENB INB
1 2 3 4
8 7 6 5
OUTA FAST GND OUTB
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4282A.2008.02.1.2
PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Selector Guide
Slew Rate (Typ) Part Number
AAT4282A-1* AAT4282A-2* AAT4282A-3
Slew Rate Controlled Load Switch
FAST (H)
1ms 0.5s 100s
SLOW (L)
Active Pull-Down
NO NO YES
Enable
Active High Active High Active High
1ms
Absolute Maximum Ratings1
Symbol
VIN VEN, FAST VOUT IMAX IDM TJ TLEAD VESD
Description
IN to GND EN, FAST to GND OUT to GND Maximum Continuous Switch Current Maximum Pulsed Current (Duty Cycle 10%) Operating Junction Temperature Range Maximum Soldering Temperature (at leads) ESD Rating2 - HBM
Value
-0.3 to 7 -0.3 to 7 -0.3 to VIN + 0.3 3 5.5 -40 to 150 300 4000
Units
V V V A A C C V
Thermal Characteristics3
Symbol
JA PD
Description
Thermal Resistance Maximum Power Dissipation
Value
70 1.78
Units
C/W W
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 resistor into each pin. 3. Mounted on a AAT4282A demo board in still 25C air.
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PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Electrical Characteristics1
Slew Rate Controlled Load Switch
VIN = 5V, TA = -40 to 85C unless otherwise noted. Typical values are at TA = 25C. Per channel. Symbol Description Conditions Min
1.5 ON/OFF = ACTIVE, FAST = VIN, IOUT = 0 ON/OFF = Inactive, OUT = Open ON/OFF = GND, VOUT = 0 VIN = 6.5V VIN = 5V VIN = 4.2V VIN = 3.0V VIN = 1.80V VIN = 1.5V VIN = 1.5V VIN = 5V VON/OFF = 5.5V VIN = 5V, RLOAD =10, TA =25C VIN = 5V, RLOAD =10, TA =25C VIN = 5V, RLOAD =10, TA =25C VIN = 5V, RLOAD =10, TA =25C VIN = 5V, RLOAD =10, TA =25C VIN = 5V, RLOAD =10, TA =25C VIN = 5V, RLOAD =10, TA =25C VIN = 5V, RLOAD =10, FAST = 5V, TA =25C VIN = 5V, RLOAD =10, FAST = 0V, TA =25C VIN = 5V, RLOAD =10, TA =25C ON/OFF = Inactive, TA =25C
Typ
Max
6.5 1.0 1.0 1.0
Units
V A A A
AAT4282A All Versions VIN Operation Voltage IQ Quiescent Current IQ(OFF) Off Supply Current ISD(OFF) Off Switch Current
RDS(ON)
On-Resistance A or B
TCRRDS On Resistance Temperature Coefficient VIL ON/OFF Input Logic Low Voltage VIH ON/OFF Input Logic High Voltage ISINK ON/OFF Input Leakage AAT4282A-12 TD(ON) Output Turn-On Delay Time TON Turn-On Rise Time TD(OFF) Output Turn-OFF Delay Time AAT4282A-22 TD(ON) Output Turn-On Delay Time Turn-On Rise Time TON TD(OFF) Output Turn-OFF Delay Time AAT4282A-3 TD(ON) Output Turn-On Delay Time TON Turn-On Rise Time TON Turn-On Rise Time TD(OFF) Output Turn-OFF Delay Time RPD Output Pull-Down Resistance During OFF
56 60 65 76 110 140 2800 1.4
130 140 160 230 280 0.4 1.0
m
ppm/C V V A s s s s s s s s s s
20 1000 4.0 0.5 0.5 4.0 20 100 1000 4.0 150
40 1500 10 2 1.0 10 40 150 1500 10 250
1. The AAT4282A is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. Contact factory for other turn on and delay options.
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PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Typical Characteristics
VIN = 5V, TA = 25C unless otherwise noted.
Slew Rate Controlled Load Switch
Quiescent Current vs. Temperature
(No Load; Single Switch)
12 12
Quiescent Current vs. Input Voltage
(No Load; Single Switch) Quiescent Current (A)
Quiescent Current (A)
10 8 6 4 2 0 -40
10 8 6 4 2 0
VIN = 5V
VIN = 3V
-15 10 35 60 85
0
1
2
3
4
5
6
Temperature (C)
Input Voltage (V)
Off Supply Current vs. Temperature
(No Load; EN = GND; VIN = 5V)
1
Typical ON/OFF Threshold vs. Input Voltage
1.3
Off Supply Current (A)
ON/OFF Threshold (V)
0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -40 -15 10 35 60 85
1.2 1.1 1 0.9 0.8 0.7 0.6 1.5 2 2.5 3 3.5 4 4.5 5 5.5
VIH VIL
Temperature (C)
Input Voltage (V)
On-Resistance vs. Temperature
100 220
On-Resistance vs. Input Voltage
On-Resistance (m)
80 70 60 50 40 30 20 10 0 -40
VIN = 3V
On-Resistance (m)
90
200 180 160 140 120 100 80 60
ISW = 2A
VIN = 5V
ISW = 100mA
2.5 3.5 4.5 5.5 6.5
-15
10
35
60
85
40 1.5
Temperature (C)
Input Voltage (V)
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PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Typical Characteristics
VIN = 5V, TA = 25C unless otherwise noted.
Slew Rate Controlled Load Switch
(VINA/VENA = 5V; VINB/VENB = 3V; RLA = 10; RLB = 20) Output Voltage Channel A (top) (V) Output Voltage Channel A (top) (V)
6 4 2 0 ENA VOUT 6 4 2 0 ENA
Output Turn-On Delay Time
Output Turn-On Delay Time
(VINA/VINB/VEN = 5V; RL = 10) Output Voltage Channel B (bottom) (V)
Output Voltage Channel B (bottom) (V)
VOUT
ENB VOUT
4 2 0
ENB VOUT
6 4 2 0
Time (50s/div)
Time (50s/div)
Output Turn-On Delay Time
(VIN = 5V; RL = 10)
6 5
Output Turn-On Delay Time
(VIN = 3V; RL = 20)
EN Current (bottom) (A) Current (bottom) (A) Voltage (top) (V) VOUT
1 4 3 2 1 0
Voltage (top) (V)
4 3 2 1 0
EN VOUT IIN
0.4 0.2 0
I IN
0.5 0
Time (50s/div)
Time (50s/div)
Output Turn-On
(RL = 10)
7 6 5
(VIN = 1.8V; RL = 10)
3.5 3 2.5
Output Turn-On
EN Voltage (V)
VEN
Voltage (V)
4 3 2 1 0
2 1.5 1 0.5 0 -0.5
VOUT (FAST = GND)
VOUT (FAST = GND) VOUT (FAST = VIN)
VOUT (FAST = VIN)
Time (500s/div)
Time (200s/div)
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4282A.2008.02.1.2
PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Typical Characteristics
VIN = 5V, TA = 25C unless otherwise noted.
Slew Rate Controlled Load Switch
Output Turn-Off Delay Time
(VIN = 5V; RL = 10)
6 5 1.2 1
Output Turn-Off Delay Time
(VIN = 3V; RL = 20)
Current (bottom) (A)
Current (bottom) (A)
Voltage (top) (V)
Voltage (top) (V)
4 3 2 1 0
IIN VOUT EN
0.8 0.6 0.4 0.2 0
4 3 2 1 0
IIN
0.4
VOUT EN
0.2 0
Time (5s/div)
Time (5s/div)
Output Turn-Off Delay Time
(VIN = 1.8V; RL = 10)
Enable Voltage (top) (V) Output Voltage (bottom) (V)
3.5 3 2.5 2 1.5 1 0.5 0 -0.5
VOUT VEN
Time (5s/div)
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PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Functional Block Diagram
INA
Slew Rate Controlled Load Switch
OUTA
Turn-On Slew Rate Control
Level Shift
* ON/OFF A
FAST/ SLOW INB OUTB
Turn-On Slew Rate Control
Level Shift
* ON/OFF B
GND
* AAT4282A-3 version only.
Functional Description
The AAT4282A is a family of flexible dual P-channel MOSFET power switches designed for high-side load switching applications. There are three versions of the AAT4282A with different turn-on and turn-off characteristics to choose from, depending upon the specific requirements of an application. The first version, the AAT4282A-1, has a moderate turn-on slew rate feature, which reduces in-rush current when the MOSFET is turned on. This function allows the load switch to be implemented with either a small input capacitor or no input capacitor at all. During turn-on slewing, the current ramps linearly until it reaches the level required for the output load condition. The proprietary turn-on current 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 the RDS(ON) is minimized. The second version, the AAT4282A-2, is a very fast switch intended for high-speed switching applications. This version has no turn-on slew rate control and no special output discharge features. The final switch version, the AAT4282A-3, has the addition of a minimized slew rate limited turn-on function and a shutdown output discharge circuit to rapidly turn off a load when the load switch is disabled through the ON/OFF pin. Using the FAST input pin on the AAT4282A-3, the device can be manually switched to a slower slew rate. All versions of the AAT4282A operate with input voltages ranging from 1.5V to 6.5V. All versions of this device have extremely low operating current, making them ideal for battery-powered applications. The ON/OFF control pin is TTL compatible and will also function with 2.5V to 5V logic systems, making the AAT4282A an ideal level-shifting load switch.
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PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Applications Information
Input Capacitor
A 1F or larger capacitor is typically recommended for CIN in most applications. A CIN capacitor is not required for basic operation; however, it is useful in preventing load transients from affecting upstream circuits. CIN should be located as close to the device VIN pin as practically possible. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CIN. There is no specific capacitor equivalent series resistance (ESR) requirement for CIN. However, for higher current operation, 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.
Slew Rate Controlled Load Switch
exceed VIN should be avoided since this would forward bias the internal parasitic diode and allow excessive current flow into the VOUT pin, possibly damaging the load switch. In applications where there is a possibility of VOUT exceeding VIN for brief periods of time during normal operation, the use of a larger value CIN capacitor is highly recommended. A larger value of CIN with respect to COUT will effect a slower CIN decay rate during shutdown, thus preventing VOUT from exceeding VIN. In applications where there is a greater danger of VOUT exceeding VIN for extended periods of time, it is recommended to place a Schottky diode from VIN to VOUT (connecting the cathode to VIN and anode to VOUT). The Schottky diode forward voltage should be less than 0.45V.
Thermal Considerations and High Output Current Applications
The AAT4282A is designed to deliver a continuous output load current. The limiting characteristic for maximum safe operating output load current is package power dissipation. 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 minimum recommended footprint as stated in the Printed Circuit Board Layout Recommendations section of this datasheet. At any given ambient temperature (TA), the maximum package power dissipation can be determined by the following equation:
Output Capacitor
For proper slew operation, a 0.1F capacitor or greater is required between VOUT and GND. Likewise, with the output capacitor, there is no specific capacitor ESR requirement. If desired, COUT may be increased without limit to accommodate any load transient condition without adversely affecting the slew rate.
Enable Function
The AAT4282A 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 1.4V. The load switch will go into shutdown mode when the voltage on the ON pin falls below 0.4V. When the load switch is in shutdown mode, the OUT pin is tri-stated, and quiescent current drops to leakage levels below 1A.
PD(MAX) =
TJ(MAX) - TA JA
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 VOUT might
Constants for the AAT4282A are maximum junction temperature (TJ(MAX) = 125C)1 and package thermal resistance (JA = 70C/W). Worst case conditions are calculated at the maximum operating temperature, TA = 85C. Typical conditions are calculated under normal ambient conditions where TA = 25C. At TA = 85C, PD(MAX) = 571mW. At TA = 25C, PD(MAX) = 1429mW.
1. The actual maximum junction temperature of AAT4282A is 150C. However, good design practice is to derate the maximum die temperature to 125C to prevent the possibility of over-temperature damage.
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PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
The maximum continuous output current for the AAT4282A is a function of the package power dissipation and the RDS of the MOSFET at TJ(MAX). The maximum RDS of the MOSFET at TJ(MAX) is calculated by increasing the maximum room temperature RDS by the RDS temperature coefficient. The temperature coefficient (TC) is 2800ppm/C. Therefore, at 125C:
Slew Rate Controlled Load Switch
and has short 3A current peaks, as in a GSM application. The current peak occurs for 576s out of a 4.61ms period. First, the current duty cycle is calculated:
x 576s % Peak Duty Cycle = 100 = 4.61ms % Peak Duty Cycle = 12.5%
The load current is 100mA for 87.5% of the 4.61ms period and 3A for 12.5% of the period. Since the Electrical Characteristics do not report RDS(MAX) for 4V operation, it must be approximated by consulting the chart of RDS(ON) vs. VIN. The RDS reported for 5V at 100mA and 3A can be scaled by the ratio seen in the chart to derive the RDS for 4V VIN at 25C: 130m * 63m/60m = 136.5m. De-rated for temperature: 136.5m * (1 + 0.002800 * (125C - 25C)) = 174.7m. For channel A, the power dissipation for a continuous 1A load is calculated as follows:
RDS(MAX) = RDS(25C) * (1 + TC * T) RDS(MAX) = 130m * + 0.002800 * (125C - 25C)) RDS(MAX) = 166.4m
For maximum current, refer to the following equation:
IOUT(MAX) <
PD(MAX) RDS
For example, if VIN = 5V, RDS(MAX) = 166.4m, and TA = 25C, IOUT(MAX) = 2.93A. If the output load current were to exceed 2.93A 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 AAT4282A. To accomplish this, the device thermal resistance must be reduced by increasing the heat sink area or by operating the load switch in a duty cycle manner. Duty cycles with peaks less than 2ms in duration can be considered using the method described in the High Peak Current Applications section of this datasheet.
PD(CHA) = IOUT2 * RDS = (1A)2 * 174.7m = 174.7mW
For channel B, the power dissipation for 100mA load is calculated as follows:
PD(MAX) = IOUT2 * RDS PD(100mA) = (100mA)2 * 174.7m PD(100mA) = 1.75mW PD(87.5%D/C) = %DC * PD(100mA) PD(87.5%D/C) = 0.875 * 1.75mW PD(87.5%D/C) = 1.53mW
The power dissipation for 100mA load at 87.5% duty cycle is 1.53mW. Now the power dissipation for the remaining 12.5% of the duty cycle at 3A is calculated:
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 IDM specification in the Absolute Maximum Ratings table to ensure the AAT4282A's 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 dissipation 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 AAT4282A which has channel A operates at a continuous 1A load current level, and channel B operates at a continuous 100mA load current level
PD(MAX) = IOUT2 * RDS PD(3A) = (3A)2 * 174.7m PD(3A) = 1572mW PD(12.5%D/C) = %DC * PD(3A) PD(12.5%D/C) = 0.125 * 1572mW PD(12.5%D/C) = 196.7mW
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4282A.2008.02.1.2
PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Finally, the total power dissipation for channels A and B is determined as follows:
Slew Rate Controlled Load Switch
Printed Circuit Board Layout Recommendations
For proper thermal management, and to take advantage of the low RDS(ON) of the AAT4282A, a few circuit board layout rules should be followed: VIN and VOUT 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.
PD(total) = PD(CHA) + PD(100mA) + PD(3A) PD(total) = 174.7mW + 1.53mW + 196.7mW PD(total) = 373mW
The maximum power dissipation for the AAT4282A operating at an ambient temperature of 85C is 373mW. The device in this example will have a total power dissipation of 571mW. This is well within the thermal limits for safe operation of the device; in fact, at 85C, the AAT4282A will handle a 3A pulse for up to 25% duty cycle. At lower ambient temperatures, the duty cycle can be further increased.
Evaluation Board Layout
The AAT4282A evaluation layout follows the printed circuit board layout recommendations and can be used for good applications layout. Refer to Figures 1 through 2. Note: Board layout shown is not to scale.
Figure 1: Evaluation Board Top Side Layout.
Figure 2: Evaluation Board Bottom Side Layout.
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PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Ordering Information
Device Option
AAT4282A-3
Slew Rate Controlled Load Switch
Package
FTDFN22-8
Marking1
WKXYY
Part Number (Tape and Reel)2
AAT4282AIPS-3-T1
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/about/quality.aspx.
Package Information3
FTDFN22-8
0.400 0.050 Index Area Detail "A"
2.000 0.050
2.000 0.050
Bottom View
Top View
0.500 0.050
0.750 0.050
Side View
Pin 1 Identification
Detail "A"
All dimensions in millimeters.
1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3. The leadless package family, which includes QFN, TQFN, DFN, FTDFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
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0.250 0.050
0.450 0.050
0.000
+ 0.100 - 0.000
0.230 0.050
4282A.2008.02.1.2
PRODUCT DATASHEET
AAT4282A
SmartSwitchTM
Slew Rate Controlled Load Switch
Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611
(c) 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. Except as provided in AnalogicTech's terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control 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 product names appearing in this document are registered trademarks or trademarks of their respective holders.
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