201908A.pdf

DATA SHEET
AAT4650
5V/3V PC Card Power Switch
General Description
Features
The AAT4650 SmartSwitch is a single channel PC card
(PCMCIA) power switch. It is used to select between two
different voltage inputs, each between 2.7V and 5.5V. An
internal switch powers the circuitry from whichever input
voltage is higher. The device’s output, VCC, is slew rate
controlled and current limited, in compliance with PC
card specifications. The current limit response time to a
short circuit is typically 1μs. The internal P-channel
MOSFET switches are configured to break before make;
that is, both switches cannot be closed at the same time.
Controlled by a 2-bit parallel interface, the four states for
VCC are VCC5, VCC3, high impedance, or ground. When in
the ground state, VCC is pulled to ground by a 5k resistor. An open drain FAULT output is asserted during overcurrent conditions. During power-up slewing, FAULT also
signals that VCC is out of tolerance. An internal overtemperature sensor forces VCC to a high impedance state
when an over-temperature condition exists. Quiescent
current is typically a low 15μA, as long as ICC is less than
approximately 500mA. Above this load current, the quiescent current increases to 200μA.
•
•
•
•
•
•
•
•
•
2.7V to 5.5V Input Voltage Range
80m (5V) Typical RDS(ON)
Low Quiescent Current 15μA (typ)
Reverse-Blocking Switches
Short-Circuit Protection
Over-Temperature Protection
FAULT Flag Output
Temperature Range: -40°C to +85°C
8-Pin SOP Package
Applications
• Notebook Computer
• PDA, Subnotebook
• Power Supply Multiplexer Circuit
The AAT4650 is available in a Pb-free, 8-pin SOP package and is specified over the -40°C to +85°C temperature range.
Typical Application
8
VCC5
VCC3
5
CTL1
CTL0
FAULT
CIN5
1μF
GND
CIN3
1μF
3
2
4
1
VCC5
VCC3
CTL1 AAT4650 VCC
CTL0
FAULT
GND
6,7
VCC
COUT
0.1μF
GND
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1
DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Pin Descriptions
Pin #
Symbol
1
2
3
4
5
6, 7
8
GND
CTL0
CTL1
FAULT
VCC3
VCC
VCC5
Function
Ground connection.
Control input (see Control Logic Table below).
Control input (see Control Logic Table below).
Open drain output; signals over-current condition.
3V supply.
Output (see Control Logic Table below).
5V supply.
Pin Configuration
SOP-8
(Top View)
1
1
2
8
7
2
GND
CTL0
CTL1
FAULT
3
6
4
5
VCC5
VCC
VCC
VCC3
Control Logic Table
2
CTL1
CTL0
Function
Result
0
0
1
1
0
1
0
1
5k
5V
3V
HiZ
VCC to GND
VCC = VCC5
VCC = VCC3
Both FETs OFF
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DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Absolute Maximum Ratings1
Symbol
Description
VCC3, VCC5
VCC
IMAX
TJ
TLEAD
VESD
IN to GND
OUT to GND
Maximum Continuous Switch Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads)
ESD Rating2 — HBM
Value
Units
-0.3 to 6
-0.3 to 6
Current Limited
-40 to 150
300
4000
V
V
A
°C
°C
V
Value
Units
120
1.0
°C/W
W
Thermal Characteristics3
Symbol
JA
PD
Description
Thermal Resistance
Power Dissipation
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 an FR4 board.
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3
DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Electrical Characteristics
VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C; bold values designate full
temperature range.
Symbol
Description
Conditions
High Impedance Output Leakage
Current
Off Mode, VCC = 0V
Min
Typ
Max
Units
1
μA
2.5
A
110
100
m
VCC Output
ICC Hi-Z
Iccsc
Short-Circuit Current Limit
RDS(ON)
On Resistance
Switch Resistance Temperature
Coefficient
VCC Switching Time (Refer to Figure 1)
t1
Output Turn-On Delay Time
t2
Output Turn-On Delay Time
t3
Output Rise Time
t4
Output Rise Time
t5
Output Turn-Off Delay Time
t6
Output Turn-Off Delay Time
t7
Output Fall Time to Off State
t8
Output Fall Time to Off State
t9
Output Fall Time to HiZ State
t10
Output Fall Time to HiZ State
Power Supply
VCC3
VCC3 Operation Voltage
VCC5
VCC5 Operation Voltage
VCC = VCCIN -0.5V, On Mode VCC3 or VCC5 Selected, TA = 25°C
VCC = 3.0V, TA = 25°C
VCC = 5.0V, TA = 25°C
1.0
85
80
Tcrds
ICC3
VCC3 Supply Current
ICC5
VCC5 Supply Current
2800
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
=
=
=
=
=
=
=
=
=
=
0V to 10% of 3.3V, ROUT = 10
0V to 10% of 5.0V, ROUT = 10
10% to 90% of 3.3V, RLOAD = 10
10% to 90% of 5.0V, RLOAD = 10
3.3V to 90% of 3.3V, RLOAD = 10
5.0V to 90% of 5.0V, RLOAD = 10
90% to 10% of 3.3V, RLOAD = 10
90% to 10% of 5.0V, RLOAD = 10
90% to 10% of 3.3V, RLOAD = 10
90% to 10% of 5.0V, RLOAD = 10
300
300
500
500
1000
1000
2.7
2.7
VCC
VCC
VCC
VCC
VCC
VCC
=
=
=
=
=
=
5V or HiZ or Off, VCC3 < VCC5, ICC Out = 0
3.3V, VCC3 < VCC5, ICC Out = 0
Off, VCC5 > VCC3, ICC Out = 0
HiZ, VCC5 > VCC3, ICC Out = 0
3.3V, VCC5 > VCC3, ICC Out = 0
5V, VCC5 > VCC3, ICC Out = 0
5
10
10
15
Parallel Interface
VCTLLOW
CTL Input Low Voltage
VCTLHI
ISINKCTL
VFAULTLOW
ISINKFAULT
Other
OTMP
4
CTL Input High Voltage
CTL Input Leakage
FAULT Logic Output Low Voltage
FAULT Logic Output High
Leakage Current
Over-Temperature Shutdown
ppm/ºC
2000
1500
3000
3000
400
400
200
200
1500
2000
5.5
5.5
1
20
1
40
40
40
0.8
VCC3 or VCC5 = 2.7V to 3.6V
VCC3 or VCC5 = 4.5V to 5.5V
VCTL = 5.5V
ISINK = 1mA
VFAULT = 5.5V
2.0
2.4
μs
V
V
μA
μA
V
V
0.01
1
0.4
μA
V
0.05
1
μA
125
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°C
DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Typical Characteristics
Unless otherwise noted, TA = 25°C.
Quiescent Current vs. Temperature
Current Limit
(ICC5)
(VCC = VCC3)
Quiescent Current (μA)
30
VCC3 = 3V CTL0 = 5V
VCC5 = 5V CTL1 = 0V
25
2
1.5
20
15
1
10
5
0.5
0
-40
-20
0
20
40
60
80
100
0
120
0
0.5
1
1.5
2
2.5
3
Temperature (°C)
Output Voltage (V)
Current Limit
Off-Switch Current vs. Temperature
(VCC = VCC5)
(ICC3)
Off-Switch Current (μA)
2
1.5
1
0.5
0
0
1
2
3
4
5
1.0000
0.1000
VCC3 = 3V
VCC5 = 5V
CTL1 = 0V
CTL0 = 0V
0.0100
0.0010
0.0001
0.0000
6
-40
-20
0
Output Voltage (V)
20
40
60
80
100
120
100
120
Temperature (°C)
Off-Switch Current vs. Temperature
RDS(ON) vs. Temperature
120.0
1.0000
0.1000
VCC3 = 3V
VCC5 = 5V
CTL1 = 0V
CTL0 = 0V
110.0
RDS(ON) (mΩ)
Off-Switch Current (μA)
(ICC3)
0.0100
0.0010
0.0001
VCC = VCC3 = 3.0V
90.0
80.0
VCC = VCC5 = 5.0V
70.0
60.0
0.0000
-40
100.0
-20
0
20
40
60
Temperature (°C)
80
100
120
-40
-20
0
20
40
60
80
Temperature (°C)
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5
DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Typical Characteristics
Unless otherwise noted, TA = 25°C.
Turn-On/Off Response
Turn-On/Off Response
(10Ω, 1μF Load)
(15Ω, 1μF Load)
CTL1 (5V/div)
CTL0 (5V/div)
FAULT (5V/div)
FAULT (5V/div)
VCC (2V/div)
VCC (2V/div)
IVCC3 (200mA/div)
IVCC5 (200mA/div)
Time (500μs/div)
Time (500μs/div)
Short Circuit Through 0.6Ω
Short Circuit Through 0.3Ω
11
4
5
Output Current
2
2
Output Voltage
0
-1
-2
0
2
4
6
8
Time (μs)
10
Input and Output (V)
8
9
6
Input Voltage
6
4
Output Current
3
2
Output Voltage
0
0
-3
-2
0
2
4
6
8
Time (μs)
Thermal Shutdown Response
CTL1 (5V/div)
FAULT (5V/div)
VCC (1V/div)
IVCC5 (500mA/div)
Time (100ms/div)
6
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10
Output (A)
Input Voltage
6
8
Output (A)
Input and Output (V)
8
DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Functional Block Diagram
VCC3
VCC5
Body Control
VCC
OverTemperature
CTL1
CTL0
OverCurrent
OverCurrent
Slew
Rate
Slew
Rate
5kΩ
FAULT
Control
Logic
GND
Functional Description
The AAT4650 is a single channel power switch that can
be used in any application where dual power supply multiplexing is required. Typical applications include PC card
applications not requiring a 12V power supply, or applications where power is switched, for example, between 5V
for operation and 3.3V for standby mode. The AAT4650
operates with input voltages ranging from 2.7V to 5.5V in
any combination and automatically powers its internal
circuitry off of whichever input voltage is higher. Two
identical low RDS(ON) P-channel MOSFETs serve as the
power multiplexing circuit with a common drain as the
VCC output and independent sources as the two VCC3 and
VCC5 inputs. A 2-bit parallel interface determines the state
of the multiplexer: VCC = VCC3, VCC = VCC5, VCC with resistive pull down to ground, or VCC high impedance. When
the state is set to either of the two inputs, the multiplex-
ing circuit will slowly slew the VCC output to the new voltage level which protects the upstream power supply from
sudden load transients. When the resistive pull down is
chosen for VCC, the VCC output is quickly discharged by the
resistive pull down. The AAT4650 always serves as an
electronic fuse by limiting the load current if it exceeds
the current limit threshold. During power-up into a short,
the current will gradually increase until the current limit
is reached. During a sudden short circuit on the output,
the current limit will respond in 1μs to isolate and protect
the upstream power supply from the load short circuit. In
most applications, because the response time is so fast,
a short circuit to VCC will not affect the upstream supply,
so system functionality will not be affected. In the case
of an over-current condition, an open drain FAULT flag
output will signal the event. The FAULT output is also
active during output voltage slew, and becomes inactive
once the output is within regulation.
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7
DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Applications Information
Input Capacitor
A 1μF or larger capacitor is typically recommended for
CIN. A CIN capacitor is not required for basic operation;
however, it is useful in preventing load transients from
affecting up-stream 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.
Output Capacitor
A 0.1μF or greater capacitor is generally required
between VCC and GND. Likewise, with the output capacitor, there is no specific capacitor ESR requirement. If
desired, COUT may be increased to accommodate any load
transient condition.
Parallel Interface / Break Before Make
A 2-bit parallel interface determines the state of the VCC
output. The logic levels are compatible with CMOS or TTL
logic. A logic low value must be less than 0.8V, and a
logic high value must be greater than 2.4V. In cases
where the interface pins rapidly change state directly
from 3V to 5V (or vice versa), internal break-beforemake circuitry prevents any back flow of current from
one input power supply to the other. In addition, the
body connections of the internal P-channel MOSFET
switches are always set to the highest potential of VCC3,
VCC5, or VCC, which prevents any body diode conduction,
power supply backflow, or possible device damage.
FAULT Output
The FAULT output is pulled to ground by an open drain
N-channel MOSFET during an over-current or output slew
condition. It should be pulled up to the reference power
supply of the controller IC via a nominal 100k resistor.
Voltage Regulation
The PC card specification calls for a regulated 5V supply
tolerance of ±5%. Of this, a typical power supply will
drop less than 2% and the PCB traces will drop another
1%. This leaves 2% for the AAT4650 as the PC card
8
switch. In the PC card application, the maximum allowable current for the AAT4650 is dominated by voltage
regulation, rather than by thermal considerations, and is
set by either the current limit or the maximum RDS(ON) of
the P-channel MOSFET. The maximum RDS(ON) at 85°C is
calculated by applying the RDS temperature coefficient to
the maximum room temperature RDS(ON):
RDS(ON)(MAX) = RDS(ON)25 × (1 + [TC ∙ ΔT])
-orRDS(ON)(MAX) = 100mΩ (1 + [0.0028 ∙ 60]) = 116.8mΩ
The maximum current is equal to the 2% tolerance of
the 5V supply (100mV) across the AAT4650 divided by
RDS(ON)(MAX). Or:
IMAX5 =
100mV
= 856.2mA
116.8mΩ
For the 3.3V supply in the PC card application, the conditions are a bit relaxed, with the allowable voltage regulation drop equal to 300mV. With a 2% supply and 1% PCB
trace regulation, the PC card switch can have a 200mV
drop. So:
IMAX3 =
200mV
= 1.5A
134mΩ
Since 1.5A is the nominal current limit value, the
AAT4650 will current limit before IMAX3 is reached.
Thermal issues are not a problem in the SOP-8 package
since JA, the package thermal resistance, is only
120°C/W. At any given ambient temperature (TA) the
maximum package power dissipation can be determined
by the following equation:
PD(MAX) =
TJ(MAX) -TA
θJA
Constants for the AAT4650 are maximum junction temperature, TJ(MAX) = 125°C, and package thermal resistance, JA = 120°C/W. Worst case conditions are calculated at the maximum operating temperature where TA =
85°C. Typical conditions are calculated under normal
ambient conditions where TA = 25°C. At TA = 85°C,
PD(MAX) = 333mW. At TA = 25°C, PD(MAX) = 833mW.
Maximum current is given by the following equation:
IOUT(MAX) =
PD(MAX)
RDS(ON)
For the AAT4650 at 85°C, IOUT(MAX) = 1.65A, a value greater than the internal minimum current limit specification.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Over-Current and
Over-Temperature Protection
Because many AAT4650 applications provide power to
external devices, it is designed to protect its host device
from malfunctions in those peripherals through slew rate
control, current limiting, and thermal limiting. The
AAT4650 current limit and thermal limit serve as an
immediate and reliable electronic fuse without any
increase in RDS(ON) for this function. Other solutions, such
as a poly fuse, do not protect the host power supply and
system from mishandling or short circuiting peripherals;
they will only prevent a fire. The AAT4650 high-speed
current limit and thermal limit not only prevent fires,
they also isolate the power supply and entire system
from any activity at the external port and report a mishap by means of a FAULT signal.
Over-current and over-temperature go hand in hand.
Once an over-current condition exists, the current supplied to the load by the AAT4650 is limited to the overcurrent threshold. This results in a voltage drop across
the AAT4650 which causes excess power dissipation and
a package temperature increase. As the die begins to
heat up, the over-temperature circuit is activated. If the
temperature reaches the maximum level, the AAT4650
automatically switches off the P-channel MOSFETs. While
they are off, the over-temperature circuit remains active.
Once the temperature has cooled by approximately
10°C, the P-channel MOSFETs are switched back on. In
this manner, the AAT4650 is thermally cycled on and off
until the short circuit is removed. Once the short is
removed, normal operation automatically resumes.
To save power, the full high-speed over-current circuit is
not activated until a lower threshold of current (approximately 500mA) is exceeded in the power device. When
the load current exceeds this crude threshold, the
AAT4650 quiescent current increases from 15μA to
200μA. The high-speed over-current circuit works by
linearly limiting the current when the current limit is
reached. As the voltage begins to drop on VCC due to current limiting, the current limit magnitude varies and
generally decreases as the VCC voltage drops to 0V.
Switching VCC Voltage
The AAT4650 meets PC card standards for switching the
VCC output by providing a ground path for VCC, as well as
a high impedance state. The PC card protocol for determining low voltage operations is to first power the peripheral with 5V and poll for 3.3V operation. When transitioning from 5V to 3.3V, VCC must be discharged to less than
0.8V to provide a hard reset. The resistive ground state
(CTL1 = 0, CTL0 = 0) will accommodate this. The ground
state will also guarantee the VCC voltage to be discharged
within the specified amount of time (100ms).
Printed Circuit Board
Layout Recommendations
For proper thermal management, to minimize PCB trace
resistance, and to take advantage of the low RDS(ON) of
the AAT4650, a few circuit board layout rules should be
followed: VCC3, VCC5, and VCC should be routed using wider
than normal traces; the two VCC pins (Pins 6 and 7)
should be connected to the same wide PCB trace; and
GND should be connected to a ground plane. For best
performance, CIN and COUT should be placed close to the
package pins.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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9
DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Timing Diagram
5
0
CTL0,1
5
Vcc
0
t1, t2
t3, t4
t5, t6
t7, t8
t9, t10
Figure 1: VCC Switching Time Diagram.
Refer to VCC Switching Time specifications in the Electrical Characteristics section for definitions of t1 to t10.
Typical PC Card Application Circuit
8
Power 5V
Supply 3.3V
5
3
CIN5
1μF
PC Card
Controller
VCC
CIN3
1μF
2
4
1
100kΩ
VCC5
VCC3
CTL1 AAT4650 VCC
CTL0
FAULT
GND
PC Card
Slot
6,7
VCC
COUT
0.1μF
FAULT
CTL1
CTL0
10
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DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Evaluation Board Layout
The AAT4650 evaluation board layout follows the printed circuit board layout recommendations and can be used for
good applications layout.
Note: Board layout shown is not to scale.
Figure 2: Evaluation Board Top Side
Silk Screen Layout / Assembly Drawing.
Figure 3: Evaluation Board
Component Side Layout.
Figure 4: Evaluation Board
Solder Side Layout.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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11
DATA SHEET
AAT4650
5V/3V PC Card Power Switch
Ordering Information
Package
Marking
Part Number (Tape and Reel)1
SOP-8
4650
AAT4650IAS-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
3.90 ± 0.10
6.00 ± 0.20
SOP-8
4.90 ± 0.10
0.42 ± 0.09 × 8
1.27 BSC
45°
4° ± 4°
0.175 ± 0.075
1.55 ± 0.20
0.375 ± 0.125
0.235 ± 0.045
0.825 ± 0.445
All dimensions in millimeters.
1. Sample stock is generally held on all part numbers listed in BOLD.
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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 environmental 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 published 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.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201908A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012