AAT4282B [SKYWORKS]
Slew Rate Controlled Load Switch; 压摆率受控负载开关
| 型号： | AAT4282B |
| 厂家： | 
SKYWORKS SOLUTIONS INC. |
| 描述： | Slew Rate Controlled Load Switch |
| 文件： | 总13页 (文件大小：1893K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
General Description
Features
The AAT4282B SmartSwitch™ is a member of Skyworks'
Application Specific Power MOSFET™ (ASPM™) product
family. The AAT4282B is a dual P-channel MOSFET power
switch designed for high-side load-switching applications.
Each MOSFET has a typical RDS(ON) of 67m, allowing
increased load switch current handling capacity with a low
forward voltage drop. The AAT4282B offers a shutdown
load discharge circuit to rapidly turn off a load circuit
when the switch is disabled. A slew-rate selector pin can
switch between fast and slow slew rate.
• VIN Range: 1.5V to 6.5V
• Low RDS(ON)
67m Typical @ 5V
125m Typical @ 1.8V
• Slew Rate Turn-On Time
▪
▪
750μs - Slow (FAST = Low)
65μs - Fast (FAST = High)
• Fast Shutdown Load Discharge Option
• Low Quiescent Current
▪
▪
40nA Typical
▪
• TTL/CMOS Input Logic Level
• Temperature Range -40°C to 85°C
• TDFN22-8 Package
The AAT4282B load switch operates from 1.5V up to
6.5V, making it 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, less than
1μA.
Applications
• Cellular Telephones
• Digital Still Cameras
• Hotswap Supplies
• Notebook Computers
• PDA Phones
The AAT4282B is available in a Pb-free, low profile 2.0 ×
2.0mm TDFN22-8 package and is specified over the
-40°C to 85°C temperature range.
• PDAs
• PMPs
• Smartphones
Typical Application
OUTA
OUTB
INA
INB
INA
OUTA
OUTB
INB
ON/OFF
AAT4282B
ENA
ENB
FAST
ON/OFF
C1
1μF
C2
1μF
C3
0.1μF
C4
0.1μF
FAST/SLOW
GND
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Pin Descriptions
Pin #
Symbol Function
This is the pin to the P-channel MOSFET source for Switch A. Bypass to ground through a 1μF capaci-
tor. INA is independent of INB
Active-High Enable Input A. A logic low turns the switch off and the device consumes less than 1μA 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 1μA 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 1μF capaci-
tor. INB is independent of INA.
1
INA
ENA
ENB
INB
2
3
4
5
6
7
8
OUTB
GND
FAST
OUTA
This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1μF 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 0.1μF capacitor.
Exposed Paddle. May be connected to ground. A large copper pad under the package is helpful for
thermal dissipation.
EP
-
Pin Configuration
TDFN22-8
(Top View)
1
2
3
4
8
7
6
5
INA
ENA
ENB
INB
OUTA
FAST
GND
OUTB
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Absolute Maximum Ratings1
Symbol
Description
Value
Units
VIN
VEN, FAST
VOUT
IN to GND
EN, FAST to GND
OUT to GND
-0.3 to 6.5
-0.3 to 6.5
-0.3 to VIN + 0.3
V
IMAX
IDM
TJ
TLEAD
VESD
Maximum Continuous Switch Current
Maximum Pulsed Current (Duty Cycle 10%)
Junction Temperature Range
Maximum Soldering Temperature (at leads)
ESD Rating2 – HBM
3
5.5
-40 to 150
300
A
°C
kV
4
Thermal Characteristics3
Symbol
Description
Value
Units
θJA
PD
Thermal Resistance
Maximum Power Dissipation4
74
1.35
°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.
2. Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
3. Mounted on a AAT4282B demo board in still 25°C air.
4. Refer to the section of "Thermal Considerations and High Output Current Applications" for the details.
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Electrical Characteristics1
VIN = 5V, TA = -40 to 85°C unless otherwise noted. Typical values are at TA = 25°C.
Symbol Description
Conditions
Min Typ Max Units
VIN
IQ
IQ(OFF)
ISD(OFF)
Operation Voltage
Quiescent Current
Off Supply Current
Off Switch Current
1.5
6.5
1.0
1.0
1.0
V
ON/OFF = ACTIVE, FAST = VIN, IOUT = 0
ON/OFF = INACTIVE, OUT = OPEN
ON/OFF = GND, VOUT = 0
μA
VIN = 6.5V, ILOAD = 300mA
VIN = 5.0V, ILOAD = 300mA
63
67
130
140
160
230
RDS(ON)
On-Resistance A or B
VIN = 4.2V, ILOAD = 300mA
VIN = 3.0V, ILOAD = 300mA
VIN = 1.8V, ILOAD = 300mA
71
82
125
2800
m
TCRRDS
VIL
VIH
ISINK
tD(ON)
tON
tON
tD(OFF)
RPD
On Resistance Temperature Coefficient
ON/OFF Input Logic Low Voltage
ON/OFF Input Logic High Voltage
ON/OFF Input Leakage
Output Turn-On Delay Time
Turn-On Rise Time
Turn-On Rise Time
Output Turn-OFF Delay Time
Output Pull-Down Resistance During OFF ON/OFF = Inactive, TA =25°C
ppm/°C
VIN = 1.5V
VIN = 5V
VON/OFF = 5.5V
VIN = 5V, RLOAD =10, TA =25°C
VIN = 5V, RLOAD =10, FAST = 5V, TA =25°C
VIN = 5V, RLOAD =10, FAST = 0V, TA =25°C
VIN = 5V, RLOAD =10, TA =25°C
0.4
V
1.4
1.0
40
150
μA
13
65
μs
750 1500
1
150
10
250
1. The AAT4282B is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and cor-
relation with statistical process controls.
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Off Supply Current vs. Temperature
Quiescent Current vs. Input Voltage
(No Load; Single Switch)
(VIN = 5.0V, EN = 0V; No Load)
0.20
0.20
0.16
0.12
0.16
0.12
0.08
0.04
0.00
0.08
0.04
0.00
-40
-15
10
35
60
85
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Input Voltage (V)
Temperature (°C)
On-Resistance vs. Temperature
On-Resistance vs. Input Voltage
(ILOAD = 300mA)
120
100
80
60
40
20
0
180
100mA
160
140
120
300mA
2000mA
100
80
V
IN = 3.0V
VIN = 5.0V
60
1.8
-40
-15
10
35
60
85
2.3
2.8
3.3
3.8
4.3
4.8
5.3
5.8
6.3
Temperature (°C)
Input Voltage (V)
Output Turn On Delay Time
EN Input ON/OFF Threshold vs. Input Voltage
(VINA = 5.0V, VINB = 3.0V, FAST = 3.0V, C = 1ꢀF,
OUT = 0.1ꢀF, RLA = RLB = 10ꢁ) IN
C
1.5
ENA/B
2V/div0
1.3
1.1
VOUTA
2V/div
0.9
0
VENH
VENL
VOUTB
2V/div0
0.7
0.5
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Input Voltage (V)
Time (40ꢀs/div)
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Output Turn On Delay Time
Output Turn On Delay Time
(VINA = VINB = FAST = 5.0V, C = 1ꢀF,
(VINA = VINB = 3.0V, CIN = 1ꢀF, COUT = 0.1ꢀF,
C
OUT = 0.1ꢀF, RLA = RLB =I1N 0ꢁ)
R
LA = RLB = 10ꢁ)
ENA/B
2V/div
ENA/B
2V/div
0
0
VOUTA/B
2V/div
VOUTA/B
2V/div
0
0
0
0
IIN
IIN
500mA/div
500mA/div
Time (40ꢀs/div)
Time (40ꢀs/div)
Output Turn On Time (Single Switch)
Output Turn On Time (Single Switch)
(VIN = FAST = 5.0V, CIN = 1ꢀF, COUT = 0.1ꢀF, RL = 10ꢁ)
(VIN = 5.0V, FAST = 0V, CIN = 1ꢀF, COUT = 0.1ꢀF, RL = 10ꢁ)
EN
2V/div
ENA/B
2V/div
0
0
VOUT
VOUT
0
0
0
2V/div
2V/div
IIN
IIN
0
500mA/div
500mA/div
Time (200ꢀs/div)
Time (40ꢀs/div)
Output Turn On Time (Single Switch)
Output Turn On Time (Single Switch)
(VIN = FAST = 1.8V, CIN = 1ꢀF, COUT = 0.1ꢀF, RL = 10ꢁ)
(VIN = 1.8V, FAST = 0V, CIN = 1ꢀF, COUT = 0.1ꢀF, RL = 10ꢁ)
EN
1V/div
EN
1V/div
0
0
VOUT
VOUT
0
0
0
0
1V/div
1V/div
IIN
IIN
100mA/div
100mA/div
Time (40ꢀs/div)
Time (100ꢀs/div)
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Output Turn Off Delay Time (Single Switch)
Output Turn Off Delay Time (Single Switch)
(VIN = 5.0V, CIN = 1ꢀF, COUT = 0.1ꢀF, RL = 10ꢁ)
(VIN = 3.0V, CIN = 1ꢀF, COUT = 0.1ꢀF, RL = 10ꢁ)
EN
2V/div
EN
2V/div
0
0
VOUT
VOUT
0
0
0
2V/div
2V/div
IIN
500mA/div
IIN
0
200mA/div
Time (4ꢀs/div)
Time (4ꢀs/div)
Output Turn Off Delay Time (Single Switch)
(VIN = 1.8V, CIN = 1ꢀF, COUT = 0.1ꢀF, RL = 10ꢁ)
EN
1V/div
0
VOUT
0
0
1V/div
IIN
100mA/div
Time (4ꢀs/div)
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Functional Block Diagram
OUTA
INA
Turn-On Slew
Rate Control
Level
Shift
ON/OFF A
FAST/
SLOW
OUTB
INB
Turn-On Slew
Rate Control
Level
Shift
ON/OFF B
GND
The AAT4282B has a minimized slew rate limited turn-on
function and a shutdown output discharge circuit to rap-
idly turn off a load when the load switch is disabled
through the ON/OFF pin. Using the FAST input pin on the
AAT4282B, the device can be manually switched to a
slower slew rate.
Functional Description
The AAT4282B is a flexible dual P-channel MOSFET power
switch designed for high-side load switching applications.
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 volt-
age. 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 AAT4282B operates with input voltages ranging from
1.5V to 6.5V. This device has an extremely low operating
current, making it ideal for battery-powered applica-
tions.
The ON/OFF control pin is TTL compatible and will also
function with 2.5V to 5V logic systems, making the
AAT4282B an ideal level-shifting load switch.
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
bias the internal parasitic diode and allow excessive cur-
rent 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 shut-
down, thus preventing VOUT from exceeding VIN. In appli-
cations 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.
Applications Information
Input Capacitor
A 1ꢀF 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 prac-
tically possible. Ceramic, tantalum, or aluminum electro-
lytic capacitors may be selected for CIN. There is no
specific capacitor equivalent series resistance (ESR)
requirement for CIN. 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.
Thermal Considerations and
High Output Current Applications
The AAT4282B 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.
Output Capacitor
For proper slew operation, a 0.1ꢀF 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 with-
out adversely affecting the slew rate.
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 data-
sheet.
Enable Function
The AAT4282B features an enable / disable function. This
pin (ENx) is active high and is compatible with TTL or
CMOS logic. To assure the load switch will turn on, the
signal level must be greater than 1.4V. The load switch
will go into shutdown mode when the voltage on the ENx
pin falls below 0.4V. When the load switch is in shutdown
mode, the OUT pin is tri-stated, and the quiescent cur-
rent drops to leakage levels below 1ꢀA.
At any given ambient temperature (TA), the maximum
package power dissipation can be determined by the fol-
lowing equation:
TJ(MAX) - TA
PD(MAX)
=
θJA
Constants for the AAT4282B are maximum junction tem-
perature (TJ(MAX) = 125°C)1 and package thermal resis-
tance (JA = 74°C/W). Worst case conditions are calcu-
lated at the maximum operating temperature, TA =
85°C. Typical conditions are calculated under normal
ambient conditions where TA = 25°C. At TA = 85°C,
PD(MAX) = 541mW. At TA = 25°C, PD(MAX) = 1351mW.
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
exceed VIN should be avoided since this would forward
The maximum continuous output current for the
AAT4282B 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
1. The actual maximum junction temperature of AAT4282B is 150°C. However, good design practice is to derate the maximum die temperature to 125°C to prevent the possibil-
ity of over-temperature damage.
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
maximum room temperature RDS by the RDS temperature
coefficient. The temperature coefficient (TC) is
2800ppm/°C. Therefore, at 125°C:
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 25°C: 130m · 72m/67m
= 139.7m. De-rated for temperature: 139.7m · (1 +
0.002800 · (125°C - 25°C)) = 178.8mΩ.
RDS(MAX) = RDS(25°C) · (1 + TC · T)
RDS(MAX) = 130m· (1 + 0.002800 · (125°C - 25°C))
RDS(MAX) = 166.4m
For channel A, the power dissipation for a continuous 1A
load is calculated as follows:
For maximum current, refer to the following equation:
PD(CHA) = IOUT2 · RDS = (1A)2 · 178.8m = 178.8mW
PD(MAX)
IOUT(MAX)
<
For channel B, the power dissipation for 100mA load is
calculated as follows:
RDS
For example, if VIN = 5V, RDS(MAX) = 166.4m, and TA =
25°C, 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 AAT4282B. 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(MAX) = IOUT2 · RDS
PD(100mA) = (100mA)2 · 178.8m
PD(100mA) = 1.79mW
PD(87.5%D/C) = %DC · PD(100mA)
PD(87.5%D/C) = 0.875 · 1.79mW
PD(87.5%D/C) = 1.57mW
The power dissipation for 100mA load at 87.5% duty
cycle is 1.57mW. Now the power dissipation for the
remaining 12.5% of the duty cycle at 3A is calculated:
PD(MAX) = IOUT2 · RDS
High Peak Output Current Applications
PD(3A) = (3A)2 · 178.8m
PD(3A) = 1609mW
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 AAT4282B’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 AAT4282B which has channel A
operates at a continuous 1A load current level, and chan-
nel B operates at a continuous 100mA load current level
and has short 3A current peaks, as in a GSM application.
The current peak occurs for 576ꢀs out of a 4.61ms period.
First, the current duty cycle is calculated:
PD(12.5%D/C) = %DC · PD(3A)
PD(12.5%D/C) = 0.125 · 1609mW
PD(12.5%D/C) = 201.1mW
Finally, the total power dissipation for channels A and B
is determined as follows:
PD(total) = PD(CHA) + PD(100mA) + PD(3A)
PD(total) = 178.8mW + 1.57mW + 201.1mW
PD(total) = 381mW
The maximum power dissipation for the AAT4282B oper-
ating at an ambient temperature of 85°C is 381mW. The
device in this example will have a total power dissipation
of 541mW. This is well within the thermal limits for safe
operation of the device; in fact, at 85°C, the AAT4282B
will handle a 3A pulse for up to 22 duty cycle. At lower
ambient temperatures, the duty cycle can be further
increased.
x
100
576µs
4.61ms
% Peak Duty Cycle =
=
% 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
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DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Printed Circuit Board
Evaluation Board Layout
Layout Recommendations
The AAT4282B evaluation layout follows the printed cir-
cuit board layout recommendations and can be used for
good applications layout. Refer to Figures 1 and Firgure
2.
For proper thermal management, and to take advantage
of the low RDS(ON) of the AAT4282B, 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.
Note: Board layout shown is not to scale.
U1
8
INA
1
7
INA
OUTA
OUTB
GND
OUTA
OUTB
(1.5V - 6.5V)
JP1
FAST/SLOW
C3
0.1µF
C1
3
2
1
2
4
1µF
FAST
INB
1
4
2
3
5
INB
(1.5V - 6.5V)
ENA
3
2
ENA
ENB
C4
0.1µF
ENB
1
3
2
6
C2
1µF
1
AAT4282BIPS
TDFN22-8
C1, C2 1µF 0603 X5R 10V (P/N: GRM188R61A105KA61D)
C3, C4 0.1µF 0603 X5R 10V (P/N: GRM188R71C104KA01D)
Figure 1: AAT4282BIPS Evaluation Board Schematic.
(a) Top Side
(b) Bottom Side
Figure 2: AAT4282BIPS Evaluation Board Layout.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012
DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
AAT4282BIPS-3-T1
TDFN22-8
W9XYY
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 Information3
TDFN22-8
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 manufactur-
ing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
12
201859B
• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012
DATA SHEET
AAT4282B
Slew Rate Controlled Load Switch
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012
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