AAT4618IGV-1.0-T1 - SKYWORKS SOLUTIONS

AAT4618

DATA SHEET

Current Limited Load Switch

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

Typical Application

AAT4618

ON (ON)

IN OUT

FAULT

GND

(ON)

100k

INPUT

GND GND

CIN

1μF

COUT

0.47μF

OUTPUT

FAULT

General Description

The AAT4618 SmartSwitch is a member of Skyworks'

Application Specific Power MOSFET™ (ASPM™) product

family. It is a current limited P-channel MOSFET power

switch designed for high-side load switching applications

operating with inputs ranging from 2.4V to 5.5V, making

it ideal for 2.5V, 3V, and 5V systems. An integrated

current-limiting circuit protects the input supply from

large currents which may cause the supply to fall out of

regulation. In addition, the AAT4618 thermal overload

protection limits power dissipation and junction temper-

atures associated with prolonged periods of operation in

current limit. Due to its low RDS(ON), the AAT4618 can be

used to control loads that require up to factory preset

400mA, 500mA, or 1A. The ultra-fast current limit

response to a sudden short circuit is a mere 400ns which

reduces the requirements of local supply bypassing. An

open drain FAULT flag signals an over-current or over-

temperature condition after a 4ms timeout. Quiescent

current is a low 10μA and the supply current decreases

to less than 1μA in shutdown mode.

The AAT4618 is available in a Pb-free 5-pin SOT-23 or a

8-pin SC70JW package and is specified over the -40°C to

+85°C temperature range.

The AAT4600 series is a family of adjustable and fixed

voltage SmartSwitch products with a range of current

handling capabilities. Single versions with adjustable

current limit (AAT4610, AAT4601) or fixed current limit

(AAT4625) are available, as well as dual versions with

fixed current limit (AAT4626, AAT4670).

Features

• 2.4V to 5.5V Input Voltage Range

• Current Limit Trip Threshold Options:

▪ 400mA Min

▪ 500mA Min

▪ 1A Min

• Fast Transient Response:

▪ 400ns Response to Short Circuit

• Low Quiescent Current:

▪ 10μA Typical

▪ < 1μA with Switch Off

• 125m Typical RDS(ON)

• FAULT Flag with 4ms Blanking

• Under-Voltage Lockout

• Thermal Shutdown

• Temperature Range: -40°C to +85°C

• 4kV ESD Rating

• 5-Pin SOT23 or 8-Pin SC70JW Package

Applications

• Hot Swap Supplies

• Notebook Computers

• Peripheral Ports

• Personal Communication Devices

• USB Ports

AAT4618

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Pin Descriptions

Pin #

Symbol Function

SOT23-5 SC70JW-8

1 5 OUT P-channel MOSFET drain.

2 6, 7, 8 GND Ground connection.

FAULT Open-drain FAULT output.

ON (ON) Enable input: AAT4618 active low, AAT4618-1 active high.

5 3, 4 IN P-channel MOSFET source.

Pin Configuration

SOT23-5 SC70JW-8

(Top View) (Top View)

3ON (ON)

FAULT

GND

OUT

ON (ON)

1 2

GND

OUT

FAULT

AAT4618

DATA SHEET

Current Limited Load Switch

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 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 resistor into each pin.

3. Mounted on a demo board.

Absolute Maximum Ratings1

TA = 25°C, unless otherwise noted.

Symbol Description Value Units

VIN, FAULT IN, FAULT to GND -0.3 to 6 V

VON ON (ON) to GND -0.3 to VIN + 1 V

VOUT OUT to GND -0.3 to VIN + 0.3 V

IOUT Output Current Internally Limited A

TJOperating Junction Temperature Range -40 to 150 °C

VESD ESD Rating2—HBM 4000 V

TLEAD Maximum Soldering Temperature (at Leads) 300 °C

Thermal Characteristics3

Symbol Description Value Units

JA Maximum Thermal Resistance 150 °C/W

PDMaximum Power Dissipation 667 mW

AAT4618

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Current Limited Load Switch

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201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

1. For VIN outside this range, consult Typical ON (ON) Threshold curve.

Electrical Characteristics

VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C; bold values denote full tem-

perature range.

Symbol Description Conditions Min Typ Max Units

VIN Operation Voltage 2.4 5.5 V

IQQuiescent Current VIN = 5V, ON (ON) = Active, IOUT = 0 10 25

μAIQ(OFF) Off Supply Current ON (ON) = Inactive, VIN = 5.5V 1

ISD(OFF) Off Switch Current ON (ON) = Inactive, VIN = 5.5V, VOUT = 0 0.1 1

VUVLO Under-Voltage Lockout VIN Falling 1.9 V

VUVLO(hys) Under-Voltage Lockout Hysteresis 0.3

RDS(ON) On Resistance VIN = 5.0V, TA = 25°C 125 175 m

VIN = 3.0V, TA = 25°C 155 225

TCRDS On Resistance Temperature Coefﬁ cient 2800 ppm/°C

ILIM Current Limit VOUT = VIN to 0.5V

AAT4618-0.4 400 500 600

mAAAT4618-0.5 500 750 1000

AAT4618-1.0 1000 1500 2000

VON(L) ON (ON) Input Low Voltage VIN = 2.7V to 5.5V10.8

VON(H) ON (ON) Input High Voltage VIN = 2.7V to ≤ 4.2V12.0

VIN = > 4.2V to 5.0V12.4

ION(SINK) ON (ON) Input Leakage VON (ON) = 5.5V 0.01 1μA

tRESP Current Loop Response VIN = 5V 400 ns

TOFF Turn-Off Time VIN = 5V, RL = 205μs

TON Turn-On Time VIN = 5V, RL = 201

VFAULTLOW FAULT Logic Output Low ISINK = 1mA 0.4 V

ISINK FAULT Logic Output High Leakage Current VFAULT = 5.5V 0.5 1μA

Tblank FAULT Blanking Time 4ms

TSD Over-Temperature Threshold VIN = 5V 125 °C

AAT4618

DATA SHEET

Current Limited Load Switch

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

Typical Characteristics

Unless otherwise noted, VIN = 5V, TA = 25°C.

Quiescent Current vs. Temperature

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

Quiescent Current (μA)

Quiescent Current vs. Input Voltage

0 123456

Input Voltage (V)

Quiescent Current (μA)

Current Limit vs. VOUT

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

012345

VOUT (V)

Current Limit (A)

RDS(ON) vs. Temperature

100

120

140

160

180

200

220

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

RDS(ON) (mΩ)

VIN = 3V

VIN = 5V

Off-Supply Current vs. Temperature

0.00

0.01

0.10

1.00

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

Off-Supply Current (μA)

Off-Switch Current vs. Temperature

0.00

0.01

0.10

1.00

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

Off-Switch Current (μA)

AAT4618

DATA SHEET

Current Limited Load Switch

6Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

Typical Characteristics

Unless otherwise noted, VIN = 5V, TA = 25°C.

Turn-On

(RL = 20Ω; CL = 0.47μF)

-1

-0.5 0.0 0.5 1.0 1.5 2.0

Time (μs)

Voltage (V)

ON OUT

Turn-Off

(RL = 20Ω; CL = 0.47μF)

-1

-10 0 10 20 30 40 50

Time (μs)

Voltage (V)

ON OUT

Short Circuit Through 0.3Ω

-10 123 45

Time (μs)

Input and Output Voltage (V)

Output Current (A)

Output Current

Output Voltage

Input Voltage

Thermal Shutdown Response

Time (50ms/div)

Output Voltage (5V/div)

Output Current (1A/div)

Fault Delay from Short Circuit

Time (1ms/div)

Output Voltage (5V/div)

Output Current (1A/div)

FAULT (5V/div)

ON (ON) Threshold vs. Input Voltage

0.4

0.6

0.8

1.2

1.4

1.6

1.8

2.2

2.4

22.533.544.555.5

Input Voltage (V)

ON (ON) Threshold (V)

VON(H)

VON(L)

AAT4618

DATA SHEET

Current Limited Load Switch

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

Functional Description

The AAT4618 is a single channel current limited load

switch that protects against short circuits by current limit-

ing to a preset level. A patented fast-acting current limit

loop limits the current in a fraction of a microsecond and

instantly resets to low impedance once the short-circuit

condition is removed. The AAT4618 is internally protected

from thermal damage by an over-temperature detection

circuit. If the die temperature reaches the internal ther-

mal limit, the power device is switched off until the die

temperature cools to a level below the thermal limit

threshold. The device will thermal cycle indefinitely until

the over-current condition is removed. The AAT4618

operates with input voltages ranging from 2.4V to 5.5V

which, along with its extremely low operating current,

makes it ideal for battery-powered applications. In cases

where the input voltage drops below 2.4V, the AAT4618

MOSFET is protected from entering the saturated region

of operation by being automatically shut down by an

under-voltage lockout circuit. A current limit condition is

reported by the open drain FAULT output. A 4ms blanking

interval prevents false reporting during the charging of a

capacitive load, which typically occurs during device turn-

on, but may also occur during a port hot plug-in event.

The AAT4618 is ideally suited for protection of periph-

eral ports such as USB, RS232, and parallel ports.

Applications Information

Input Capacitor

The input capacitor CIN protects the power supply from

current transients generated by the load attached to the

AAT4618. When a short circuit is suddenly applied to the

output of the AAT4618, a large current, limited only by

the RDS(ON) of the MOSFET, will flow for less than 1μs

before the current limit circuitry activates. (See charac-

teristic curve “Short Circuit Through 0.3.") In this

event, a moderately sized CIN will dramatically reduce

the voltage transient seen by the power supply and by

other circuitry upstream from the AAT4618. The extreme-

ly fast short-circuit response time of the AAT4618 reduc-

es the size requirement of CIN.

CIN should be located as close to the device VIN pin as

practically possible. Ceramic, tantalum, or aluminum

electrolytic capacitors are appropriate for CIN. There is no

specific capacitor ESR requirement for CIN. However, for

higher current operation, ceramic capacitors are recom-

mended for CIN due to their inherent capability over tan-

talum capacitors to withstand input current surges from

low impedance sources such as batteries in portable

devices.

Functional Block Diagram

IN OUT

ON (ON)

GND

Under-Voltage

Lockout

Over-Temperature

Protection

Current

Limit

FAULT

4ms Delay

AAT4618

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Output Capacitor

In order to insure stability while current limit is active, a

low capacitance (approximately 0.47μF) is required. No

matter how large the output capacitor, output current is

limited to the value set by the AAT4618 current limiting

circuitry, so very large output capacitors can be used.

For example, USB ports are specified to have at least

120μF of capacitance downstream from their controlling

power switch. The current limiting circuit will allow an

output capacitance of 1000μF or more without disturbing

the upstream power supply.

ON (Enable Input)

In many systems, power planes are controlled by inte-

grated circuits which run at lower voltages than the

power plane itself. The enable input (ON) of the AAT4618

has low and high threshold voltages that accommodate

this condition. The threshold voltages are compatible

with 5V TTL and 2.5V to 5V CMOS systems.

When switching the AAT4618 on into a capacitive load,

the AAT4618 will charge the output capacitive load at a

rate no greater than the current limit setting.

Attaching Loads

Capacitive loads attached to an enabled AAT4618 will

charge at a rate no greater than the current limit set-

ting.

FAULT Output

The FAULT flag is provided to alert the system if an

AAT4618 load is not receiving sufficient voltage to oper-

ate properly. If current limit or over-temperature circuits

in any combination are active for more than approxi-

mately 4ms, the FAULT flag is pulled to ground through

approximately 100. The filtering of voltage or current

transients of less than 4ms prevents capacitive loads

connected to the AAT4618 output from activating the

FAULT flag when they are initially attached. Pull-up resis-

tances of 1k to 100k are recommended. Since FAULT

is an open drain terminal, it may be pulled up to any

unrelated voltage less than the maximum operating volt-

age of 5.5V, allowing for level shifting between circuits.

Thermal Considerations

Since the AAT4618 has internal current limit and over-

temperature protection, junction temperature is rarely a

concern. However, if the application requires large cur-

rents in a hot environment, it is possible that tempera-

ture, rather than current limit, will be the dominant

regulating condition. In these applications, the maxi-

mum current available without risk of an over-tempera-

ture condition must be calculated. The maximum inter-

nal temperature while current limit is not active can be

calculated using Equation 1.

Eq. 1: TJ(MAX) = IMAX2 • RDS(ON)(MAX) • RΘJA + TA(MAX

)

In Equation 1, IMAX is the maximum current required by

the load. RDS(ON)(MAX) is the maximum rated RDS(ON) of the

AAT4618 at high temperature. RJA is the thermal resis-

tance between the AAT4618 die and the board onto

which it is mounted. TA(MAX) is the maximum temperature

that the PCB under the AAT4618 would be if the AAT4618

were not dissipating power. Equation 1 can be rear-

ranged to solve for IMAX, as shown in Equation 2.

Eq. 2: =

IMAX

TSD(MIN) - TA(MAX)

RDS(ON)(MAX) · RΘJA

TSD(MIN) is the minimum temperature required to activate

the AAT4618 over-temperature protection. With the

typical specification of 125°C, 115°C is a safe minimum

value to use.

For example, if an application is specified to operate in

50°C environments, the PCB operates at temperatures

as high as 85°C. The application is sealed and its PCB is

small, causing RJA to be approximately 150 °C/W. Using

Equation 2,

Eq. 3: =

IMAX = 950m

115 - 85

220 · 150

The AAT4618 is safe to operate at the minimum current

limit level of 500mA at 85°C.

AAT4618

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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201942A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

1. XYY = assembly and date code.

2. Sample stock is generally held on all part numbers listed in BOLD.

Ordering Information

Package Enable Current Limit Marking1Part Number (Tape and Reel)2

SOT23-5 Active Low 0.5 AVXYY AAT4618IGV-0.5-T1

SOT23-5 Active High 0.5 DWXYY AAT4618IGV-0.5-1-T1

SOT23-5 Active Low 1.0 EVXYY AAT4618IGV-1.0-T1

SOT23-5 Active High 1.0 EIXYY AAT4618IGV-1.0-1-T1

SC70JW-8 Active Low 0.4

SC70JW-8 Active High 0.4

SC70JW-8 Active Low 0.5 AVXYY AAT4618IJS-0.5-T1

SC70JW-8 Active High 0.5 DWXYY AAT4618IJS-0.5-1-T1

SC70JW-8 Active Low 1.0 EVXYY AAT4618IJS-1.0-T1

SC70JW-8 Active High 1.0 EIXYY AAT4618IJS-1.0-1-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

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

0.60 REF

All dimensions in millimeters

AAT4618

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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, speciﬁ cations 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 conﬂ icts, incompatibilities, or other difﬁ culties 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

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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 speciﬁ cations as a result of design defects, errors, or operation of products outside of pub-

lished parameters or design speciﬁ cations. 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 speciﬁ cations 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

identiﬁ cation 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

2.10

0.30

2.00

0.20

1.75

0.10

0.85

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.