AAT4282A [ANALOGICTECH]
Dual Slew Rate Controlled Load Switch; 双压摆率受控负载开关
| 型号： | AAT4282A |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | Dual Slew Rate Controlled Load Switch |
| 文件： | 总14页 (文件大小：547K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT4282A
Dual Slew Rate Controlled Load Switch
™
SmartSwitch
General Description
Features
The AAT4282A SmartSwitch™ is a member of
AnalogicTech's Application Specific Power MOS-
FET™ (ASPM™) 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 60mΩ, 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 3µs turn-off times. The
AAT4282A (-3) variation offers a shutdown load dis-
charge 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.
•
•
VIN Range: 1.5V to 6.5V
Low RDS(ON)
— 60mΩ Typical @ 5V
— 140mΩ Typical @ 1.5V
Slew Rate Turn-On Time Options
— 1ms
— 0.5µs
— 100µs
Fast Shutdown Load Discharge Option
Low Quiescent Current
— Typically 1µA
TTL/CMOS Input Logic Level
Temperature Range -40ºC to 85°C
FTDFN22-8 Package
•
•
•
•
•
•
Applications
•
•
•
•
•
•
•
•
Cellular Telephones
Digital Still Cameras
Hotswap Supplies
Notebook Computers
PDA Phones
PDAs
PMPs
Smartphones
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 1µA.
The AAT4282A is available in the Pb-free, low pro-
file 2.0x2.0mm FTDFN22-8 package and is speci-
fied over the -40 to 85°C temperature range.
Typical Application
OUTA
INA
INA
OUTA
OUTB
INB
INB
OUTB
ON/OFF
AAT4282A
ENA
ENB
FAST
ON/OFF
C1
1μF
C2
1μF
C3
0.1μF
C4
0.1μF
FAST/SLOW
GND
N/C
4282A.2007.09.1.1
1
AAT4282A
Dual Slew Rate Controlled Load Switch
Pin Descriptions
Pin #
Symbol
Function
1
INA
This is the pin to the P-channel MOSFET source for Switch A. Bypass to ground
through a 1µF capacitor. INA is independent of INB
2
3
4
5
ENA
ENB
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 capacitor. INB is independent of INA.
OUTB
This is the pin to the P-channel MOSFET drain connection. Bypass to ground through
a 0.1µF capacitor.
6
7
8
GND
FAST
OUTA
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.
Pin Configuration
FTDFN22-8
(Top View)
1
2
3
4
8
7
6
5
INA
ENA
ENB
INB
OUTA
FAST
GND
OUTB
2
4282A.2007.09.1.1
AAT4282A
Dual Slew Rate Controlled Load Switch
Selector Guide
Slew Rate (Typ)
Active
Part Number
FAST (H)
SLOW (L)
Pull-Down
Enable
AAT4282A-1*
AAT4282A-2*
AAT4282A-3
1ms
0.5µs
NO
NO
YES
Active High
Active High
Active High
100µs
1ms
1
Absolute Maximum Ratings
Symbol
Description
Value
Units
VIN
VEN, FAST
VOUT
IMAX
IN to GND
EN, FAST to GND
OUT to GND
Maximum Continuous Switch Current
Maximum Pulsed Current
-0.3 to 7
-0.3 to 7
-0.3 to VIN + 0.3
3
V
V
V
A
A
IDM
Duty Cycle ≤ 10%
5.5
TJ
TLEAD
VESD
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads)
ESD Rating – HBM
-40 to 150
300
°C
°C
V
2
4000
3
Thermal Characteristics
Symbol
Description
Value
Units
θJA
PD
Thermal Resistance
Maximum Power Dissipation
70
1.78
°C/W
W
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 1.5kΩ resistor into each pin.
3. Mounted on a AAT4282A demo board in still 25°C air.
4282A.2007.09.1.1
3
AAT4282A
Dual Slew Rate Controlled Load Switch
1
Electrical Characteristics
VIN = 5V, TA = -40 to 85°C unless otherwise noted. Typical values are at TA = 25°C. Per channel.
Symbol
Description
Conditions
Min Typ Max Units
AAT4282A All Versions
VIN
Operation Voltage
1.5
6.5
1.0
V
ON/OFF = ACTIVE, FAST = VIN,
IOUT = 0
IQ
Quiescent Current
µA
IQ(OFF)
ISD(OFF)
Off Supply Current
Off Switch Current
ON/OFF = Inactive, OUT = Open
ON/OFF = GND, VOUT = 0
VIN = 6.5V
1.0
1.0
µA
µA
56
60
65
76
110
140
VIN = 5V
130
140
160
230
280
VIN = 4.2V
RDS(ON)
On-Resistance A or B
mΩ
VIN = 3.0V
VIN = 1.80V
VIN = 1.5V
On Resistance Temperature
Coefficient
TCRRDS
2800
ppm/°C
VIL
VIH
ISINK
ON/OFF Input Logic Low Voltage VIN = 1.5V
ON/OFF Input Logic High Voltage VIN = 5V
0.4
1.0
40
V
V
µA
1.4
ON/OFF Input Leakage
VON/OFF = 5.5V
2
2
AAT4282A -1
TD(ON)
Output Turn-On Delay Time
Turn-On Rise Time
Output Turn-OFF Delay Time
VIN = 5V, RLOAD =10Ω, TA =25°C
VIN = 5V, RLOAD =10Ω, TA =25°C
VIN = 5V, RLOAD =10Ω, TA =25°C
20
µs
µs
µs
TON
1000 1500
TD(OFF)
AAT4282A -2
TD(ON)
4.0
10
Output Turn-On Delay Time
Turn-On Rise Time
Output Turn-OFF Delay Time
VIN = 5V, RLOAD =10Ω, TA =25°C
VIN = 5V, RLOAD =10Ω, TA =25°C
VIN = 5V, RLOAD =10Ω, TA =25°C
0.5
0.5
4.0
2
1.0
10
µs
µs
µs
TON
TD(OFF)
AAT4282A -3
TD(ON)
Output Turn-On Delay Time
Turn-On Rise Time
VIN = 5V, RLOAD =10Ω, TA =25°C
20
40
µs
µs
V
IN = 5V, RLOAD =10Ω, FAST = 5V,
TA =25°C
IN = 5V, RLOAD =10Ω, FAST = 0V,
TON
100
150
V
TON
TD(OFF)
RPD
Turn-On Rise Time
1000 1500
µs
µs
Ω
TA =25°C
Output Turn-OFF Delay Time
Output Pull-Down Resistance
During OFF
VIN = 5V, RLOAD =10Ω, TA =25°C
4.0
10
ON/OFF = Inactive, TA =25°C
150
250
1. The AAT4282A is guaranteed to meet performance specifications over the -40°C to +85°C 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.
4
4282A.2007.09.1.1
AAT4282A
Dual Slew Rate Controlled Load Switch
Typical Characteristics
VIN = 5V, TA = 25ºC unless otherwise noted.
Quiescent Current vs. Temperature
(No Load; Single Switch)
Quiescent Current vs. Input Voltage
(No Load; Single Switch)
12
10
8
12
10
8
6
4
2
0
VIN = 5V
6
4
VIN = 3V
2
0
-40
-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)
Typical ON/OFF Threshold vs. Input Voltage
1.3
1.2
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.1
V
IH
1
V
IL
0.9
0.8
0.7
0.6
1.5
2
2.5
3
3.5
4
4.5
5
5.5
-40
-15
10
35
60
85
Temperature (°C)
Input Voltage (V)
On-Resistance vs. Temperature
On-Resistance vs. Input Voltage
100
90
80
70
60
50
40
30
20
10
0
220
200
180
160
140
120
100
80
VIN = 3V
ISW = 2A
VIN = 5V
ISW = 100mA
60
40
1.5
2.5
3.5
4.5
5.5
6.5
-40
-15
10
35
60
85
Temperature (°C)
Input Voltage (V)
4282A.2007.09.1.1
5
AAT4282A
Dual Slew Rate Controlled Load Switch
Typical Characteristics
VIN = 5V, TA = 25ºC unless otherwise noted.
Output Turn-On Delay Time
(VINA/VENA = 5V; VINB/VENB = 3V; RLA = 10Ω; RLB = 20Ω)
Output Turn-On Delay Time
(VINA/VINB/VEN = 5V; RL = 10Ω)
6
6
ENA
ENA
4
4
VOUT
VOUT
2
2
0
0
6
ENB
4
4
ENB
VOUT
2
2
VOUT
0
0
Time (50µs/div)
Time (50µs/div)
Output Turn-On Delay Time
(VIN = 5V; RL = 10Ω)
Output Turn-On Delay Time
(VIN = 3V; RL = 20Ω)
6
EN
5
4
4
VOUT
EN
3
3
2
1
0
0.4
0.2
0
2
1
0
1
VOUT
IIN
0.5
0
IIN
Time (50µs/div)
Time (50µs/div)
Output Turn-On
(RL = 10ΩΩ)
Output Turn-On
(VIN = 1.8V; RL = 10Ω)
3.5
3
7
EN
6
5
4
3
2
1
0
VEN
2.5
2
VOUT (FAST = GND)
1.5
1
VOUT (FAST = GND)
0.5
0
VOUT (FAST = VIN)
VOUT (FAST = VIN)
-0.5
Time (500µs/div)
Time (200µs/div)
6
4282A.2007.09.1.1
AAT4282A
Dual Slew Rate Controlled Load Switch
Typical Characteristics
VIN = 5V, TA = 25ºC unless otherwise noted.
Output Turn-Off Delay Time
(VIN = 5V; RL = 10Ω)
Output Turn-Off Delay Time
(VIN = 3V; RL = 20Ω)
6
5
1.2
1
4
4
0.8
0.6
0.4
0.2
0
IIN
3
3
IIN
2
1
0
0.4
0.2
0
2
VOUT
VOUT
1
0
EN
EN
Time (5µs/div)
Time (5µs/div)
Output Turn-Off Delay Time
(VIN = 1.8V; RL = 10Ω)
3.5
3
2.5
2
1.5
1
VOUT
0.5
0
VEN
-0.5
Time (5µs/div)
4282A.2007.09.1.1
7
AAT4282A
Dual 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
* AAT4282A-3 version only
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 slew-
ing, the current ramps linearly until it reaches the
level required for the output load condition. The
Functional Description
The AAT4282A is a family of flexible dual P-chan-
nel 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
8
4282A.2007.09.1.1
AAT4282A
Dual Slew Rate Controlled Load Switch
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 thresh-
old level of the MOSFET. Once at this level, the
current begins to slew as the gate voltage is slow-
ly 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.
Applications Information
Input Capacitor
A 1μF 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, ceram-
ic capacitors are recommended for CIN due to their
inherent capability over tantalum capacitors to with-
stand input current surges from low-impedance
sources, such as batteries in portable devices.
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.
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 spe-
cific capacitor ESR requirement. If desired, COUT
may be increased without limit to accommodate
any load transient condition without adversely
affecting the 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.
Enable Function
The AAT4282A features an enable / disable func-
tion. 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 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, main-
taining a reverse bias on the internal parasitic
diode. Conditions where VOUT might exceed VIN
should be avoided since this would forward bias
4282A.2007.09.1.1
9
AAT4282A
Dual Slew Rate Controlled Load Switch
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 larg-
er value of CIN with respect to COUT will effect a
slower CIN decay rate during shutdown, thus pre-
venting VOUT from exceeding VIN. In applications
where there is a greater danger of VOUT exceeding
VIN for extended periods of time, it is recommend-
ed to place a Schottky diode from VIN to VOUT (con-
necting the cathode to VIN and anode to VOUT). The
Schottky diode forward voltage should be less than
0.45V.
Constants for the AAT4282A are maximum junction
temperature (TJ(MAX) = 125°C) and package ther-
mal resistance (θJA = 70°C/W). Worst case condi-
tions are calculated at the maximum operating tem-
perature, TA = 85°C. Typical conditions are calcu-
lated under normal ambient conditions where TA =
25°C. At TA = 85°C, PD(MAX) = 571mW. At TA =
25°C, PD(MAX) = 1429mW.
The maximum continuous output current for the
AAT4282A is a function of the package power dis-
sipation and the RDS of the MOSFET at TJ(MAX). The
maximum RDS of the MOSFET at TJ(MAX) is calcu-
lated by increasing the maximum room tempera-
ture RDS by the RDS temperature coefficient. The
temperature coefficient (TC) is 2800ppm/°C.
Therefore, at 125°C:
Thermal Considerations and High
Output Current Applications
RDS(MAX) = RDS(25°C) · (1 + TC · ΔT)Ω
RDS(MAX) = 130mΩ · + 0.002800 · (125°C - 25°C))
RDS(MAX) = 166.4mΩ
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.
For maximum current, refer to the following equation:
PD(MAX)
IOUT(MAX)
<
RDS
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.
For example, if VIN = 5V, RDS(MAX) = 166.4mΩ, and
TA = 25°C, IOUT(MAX) = 2.93A. If the output load cur-
rent were to exceed 2.93A or if the ambient tem-
perature were to increase, the internal die temper-
ature 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.
At any given ambient temperature (TA), the maxi-
mum package power dissipation can be deter-
mined by the following equation:
TJ(MAX) - TA
PD(MAX)
=
θJA
1 The actual maximum junction temperature of AAT4282A is 150°C. However, good designed practice is to derate the maximum die tem-
perature down to 125 °C to prevent the possibility of over-temperature damage.
10
4282A.2007.09.1.1
AAT4282A
Dual Slew Rate Controlled Load Switch
PD(87.5%D/C) = 1.53mW
High Peak Output Current Applications
Some applications require the load switch to oper-
ate at a continuous nominal current level with short
duration, high-current peaks. Refer to the IDM spec-
ification in the Absolute Maximum Ratings table to
ensure the AAT4282A’s maximum pulsed current
rating is not exceeded. The duty cycle for both out-
put current levels must be taken into account. To do
so, first calculate the power dissipation at the nom-
inal continuous current level, and then add the
additional power dissipation due to the short dura-
tion, 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 and has short
3A current peaks, as in a GSM application. The
current peak occurs for 576μs out of a 4.61ms peri-
od. First, the current duty cycle is calculated:
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:
2
PD(MAX) = IOUT · RDS
2
PD(3A) = (3A) · 174.7mΩ
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
Finally, the total power dissipation for channels A
and B is determined as follows:
PD(total) = PD(CHA) + PD(100mA) + PD(3A)
PD(total) = 174.7mW + 1.53mW + 196.7mW
PD(total) = 373mW
⎛ x ⎞ ⎛ 576μs ⎞
% Peak Duty Cycle =
=
⎝
⎠
⎝
⎠
4.61ms
100
The maximum power dissipation for the AAT4282A
operating at an ambient temperature of 85°C is
373mW. The device in this example will have a
total power dissipation of 571mW. This is well with-
in the thermal limits for safe operation of the
device; in fact, at 85°C, the AAT4282A will handle
a 3A pulse for up to 25% duty cycle. At lower ambi-
ent temperatures, the duty cycle can be further
increased.
% 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 consult-
ing 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: 130mΩ · 63mΩ /60mΩ = 136.5mΩ . De-
rated for temperature: 136.5mΩ · (1 + 0.002800 ·
(125°C - 25°C)) = 174.7mΩ.
Printed Circuit Board Layout
Recommendations
For channel A, the power dissipation for a continu-
ous 1A load is calculated as follows:
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.
2
2
PD(CHA) = IOUT · RDS = (1A) · 174.7mΩ = 174.7mW
For channel B, the power dissipation for 100mA
load is calculated as follows:
2
PD(MAX) = IOUT · RDS
2
PD(100mA) = (100mA) · 174.7mΩ
PD(100mA) = 1.75mW
PD(87.5%D/C) = %DC · PD(100mA)
PD(87.5%D/C) = 0.875 · 1.75mW
4282A.2007.09.1.1
11
AAT4282A
Dual Slew Rate Controlled Load Switch
Evaluation Board Layout
The AAT4282A evaluation layout follows the print-
ed 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.
12
4282A.2007.09.1.1
AAT4282A
Dual Slew Rate Controlled Load Switch
Ordering Information
1
2
Device Option
Package
Marking
Part Number (Tape and Reel)
AAT4282A-3
FTDFN22-8
WKXYY
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/pbfree.
3
Package Information
FTDFN22-8
0.400 0.050
Detail "A"
Index Area
Bottom View
2.000 0.050
Top View
0.500 0.050
+
0.100
0.000
- 0.000
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.
4282A.2007.09.1.1
13
AAT4282A
Dual Slew Rate Controlled Load Switch
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14
4282A.2007.09.1.1
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