AAT4614IJS-2-T1 - SKYWORKS SOLUTIONS

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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

201939A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

General Description

The AAT4614 SmartSwitch is a current limited P-channel

MOSFET power switch designed for high side load switch-

ing applications. This switch operates with inputs ranging

from 2.4V to 5.5V, making it ideal for both 3V and 5V

systems. An integrated current-limiting circuit protects

the input supply against large currents which may cause

the supply to fall out of regulation. Reverse current

blocking is provided to protect the load switch from

reverse current potentials while the device is shutdown.

The AAT4614 is also protected from thermal overload

which is limited by power dissipation and junction tem-

peratures. Current limit threshold is programmed with a

resistor from SET to ground and may be adjusted for

levels up to 1.4A. The ultra-fast current limit response to

a sudden short circuit is a mere 1s which reduces the

requirements of local supply bypassing. An open drain

FAULT flag signals an over-current or over-temperature

condition after a 4ms blanking time to prevent false

reporting. Quiescent current is a low 10A and the supply

current decreases to less than 1A in shutdown mode.

The AAT4614 is offered in the small Pb-free, 8-pin

SC70JW, SOT23-6 and SOT23-5 packages, and is speci-

fied for operation over the -40°C to +85°C ambient

temperature range.

Features

• Input Voltage Range: 2.4V to 5.5V

• Programmable Over-Current Threshold

• Fast Transient Response:

 1s Response to Short Circuit

• Low Quiescent Current

 10A Typical while Enabled

 1A Max with Switch Off (TA = 25°C)

• 130m Typical RDS(ON)

• Only 2.4V Needed for ON/OFF Control

• Under-Voltage Lockout

• Reverse Blocking During Disable

• 4ms Fault Blanking

• Fault Flag Open Drain Output

(Not Available for SOT23-5 Package)

• Active Hi/Lo Enable Options

• Over-Temperature Protection

• 4kV ESD Rating

• 6-Pin SOT23, 5-Pin SOT23,or 8-Pin SC70JW Package

• Temperature Range: -40°C to +85°C

Applications

• Hot Swap Supplies

• Notebook Computers

• Portable Products

• Proprietary Peripheral Ports

• USB Ports

Typical Application

OUT

ON/ON

SET FLTGND

RSET

100k

Output

Fault Flag

Power Supply Input

AAT4614

1μF 0.47μF

EN/EN

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

2Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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Pin Description

Pin #

Symbol Description

SOT23-6 SOT23-5 SC70JW-8

1 1 5 OUT Current limiting load switch output (high side P-channel MOSFET Drain). Connect

a 0.47F capacitor from OUT to GND for best load transient response.

2 2 6,7,8 GND IC ground connection

3 n/a 1 FLT Current limit fault ﬂ ag pin, open-drain output, active low signal. Pull up with a

10k to 100k resistor.

44 2

ON/ON Load switch enable input. Active high and active low options are available.

5 3 3 SET Current limit set pin. Connect a resistor between this pin and ground to program

the desired current limit set point.

65 4 IN

Load switch power supply input pin (high side P-channel MOSFET source). Bypass

with a 1F capacitor from IN to GND.

Pin Configuration

SOT23-6 SOT23-5

(Top View) (Top View)

GND

SET

ON/ON

FLT

OUT

GND

ON/ON

SET

OUT

SC70JW-8

(Top View)

ON/ON

SET

GND

OUT

FLT 1

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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

201939A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

Absolute Maximum Ratings1

Symbol Description Value Units

VIN IN to GND -0.3 to 6 V

VON,VFLT ON/ON, FLT to GND -0.3 to VIN + 0.3 V

VOUT

, VSET OUT, SET to GND -0.3 to VIN + 0.3 V

IMAX Maximum DC Output Current22000 mA

VESD ESD Rating, HBM 4000 V

TJMaximum Junction Operating temperature -40 to +150 °C

TLEAD Maximum Soldering Temperature (at leads, 10 sec) 300 °C

Thermal Information

Symbol Package Description Value Units

SOT23-6(-5) Maximum Power Dissipation2,3 625 mW

SC70JW8 667 mW

JA

SOT23-6(-5) Maximum Thermal Resistance3150 °C/W

SC70JW8 160 °C/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. Mounted on FR4 circuit board.

3. Derate 6.25mW/°C above 40°C ambient temperature

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

4Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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Electrical Characteristics

VIN = 5V; TA = -40°C to 85°C unless otherwise noted. Typical values are at TA = 25°C.

Symbol Description Conditions Min Typ Max Units

VIN Input Voltage Range 2.4 5.5 V

IQOperation Quiescent Current VIN = 5V, ON/ON = Active, IOUT = 0 10 25

AIQ(OFF) Off Supply Current ON/ON = Inactive, VIN = 5.5V 0.01 1

ISD(OFF) Off Switch Current ON/ON = Inactive, VIN = 5.5V, TA = 25°C 0.01 1

VUVLO Under-Voltage Lockout Rising edge 1.8 2.4 V

VUVLO_HYS Under-Voltage Lockout Hysteresis 0.1

RDS(ON) On-Resistance VIN = 5.0V, TA = 25°C 160 210 m

VIN = 3.0V, TA = 25°C 180 240

TCRDS On-Resistance Temperature Coefﬁ cient 2800 ppm/°C

ILIM Current Limit RSET = 6.8k; VOUT = VIN - 0.5V 0.75 1 1.25 A

VON(L) ON/ON Input Low Voltage VIN = 2.7V to 5.5V 0.6

VON(H) ON/ON Input High Voltage VIN = 2.7V to <4.2V 2.0

VIN  4.2V to 5.5V 2.4

ION(SINK) Input Leakage Current VON = 5.5V 0.01 1 A

TRESP Current Limit Response Time VIN = 5V 1

sTON Turn On Time VIN = 5V; RO = 1012 200

TOFF Turn Off Time VIN = 5V; RO = 1055 100

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

TJ Decreasing 115

TBLANK Fault Flag Blanking Time 4ms

VFLT(LO) Fault Flag Logic Low Output IFLT(SINK) = 1mA 0.4 V

IFLT(SINK) Fault Flag Logic High Leakage Current 0.5 1 A

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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

201939A • 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, RSET = 6.8K.

Quiescent Current vs. Temperature

Temperature (°C)

IQ (µA)

-40 -15 10 35 60 85

Output Current vs. Output Voltage

(RSET = 6.8KΩ)

Output Voltage (V)

Normalized Current Limit (A)

012345

0.2

0.4

0.6

0.8

1.2

1.4

Quiescent Current vs. Input Voltage

Input Voltage (V)

IQ (µA)

01 23 45 6

Off-Switch Current vs. Temperature

Temperature (°C)

Off-Switch Current (µA)

-40 -15 10 35 60 85

100

120

140

160

180

200

220

-40 -15 10 35 60 85

VIN = 5V

VIN = 3V

RDS(ON) vs. Temperature

Temperature (°C)

RDS(ON) (mΩ)

RSET vs. ILIM

ILIM (mA)

RSET (kΩ)

1300900 1100 1500

500 700

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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

201939A • 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, RSET = 6.8K.

ON(ON) Threshold vs. Input Voltage

Input Voltage (V)

ON(ON) Threshold (V)

2 2.5 3 3.5 4 4.5 5 5.5

0.4

0.6

0.8

1.2

1.4

1.6

1.8

2.2

2.4

VON(ON)-Hi

VON(ON)-Lo

Turn-On

(RL = 20Ω; CL = 0.47µF)

Time (10µs/div)

VOUT

(2V/div)

Turn-Off

(VIN = 5.0V; RL = 20Ω; CL = 0µF)

Time (10µs/div)

VOUT

(2V/div)

Short Circuit Through 0.3Ω Resistor

Time (2µs/div)

VOUT

(2V/div)

IOUT

(4A/div)

VIN

(2V/div) 0

Thermal Shutdown Response

(RL = 1Ω; CL = 0.47µF)

Time (50ms/div)

VOUT

(2V/div)

IOUT

(1A/div) 0

Fault Delay from Short Circuit

Time (1ms/div)

VOUT

(5V/div)

FLT

(5V/div)

IOUT

(1A/div)

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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

201939A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

Functional Block Diagram

Over-Temp.

Protection

1.2V

Reference

Current

Limit

Control

Under-

Voltage

Lockout

4ms Delay

OUT

SET

GND

ON/ON

FLT

Reverse

Blocking

Functional Description

The AAT4614 is a single channel current limiting load

switch that is intended to protect against short circuit

and over current events by current limiting to a preset

level. This device also provides a reverse current block-

ing feature, on / off enable control, and a fault flag to

notify a system controller of an over current, short cir-

cuit or over temperature event.

In the event of a load current exceeding a user pro-

grammed current limit level (ILIM), a high speed current

limit loop limits the current in a microsecond and will

reset to low impedance once the short-circuit condition is

removed. The AAT4614 is internally protected from ther-

mal damage by an over-temperature detection circuit. If

the die temperature reaches the internal thermal limit,

the power device is switched off until the die tempera-

ture cools to a level below the thermal limit threshold.

This device may operate in a thermal cycling state indef-

initely or until the over-current condition is removed.

The AAT4614 operates with input voltages ranging from

2.4V to 5.5V which, along with its extremely low operat-

ing current, makes it ideal for battery-powered applica-

tions. In cases where the input voltage drops below 2.4V,

the AAT4614 MOSFET is protected from entering the

saturated region of operation by being automatically

shutting down via an under-voltage lockout circuit.

Current limit or over temperature conditions are reported

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

prevents false reporting during the charging of a capaci-

tive load, which typically occurs during device turn-on,

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

AAT4614 is ideally suited for protection of peripheral

ports such as USB, RS232, and parallel ports.

Reverse Current Blocking

The AAT4614's reverse current blocking feature prevents

current to flow from OUT to IN when the device is dis-

abled. When the device is enabled, the electrical charac-

teristics between IN and OUT is still similar to an ideal

switch; current can flow in either direction.

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

8Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201939A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

Application Information

Setting the Current Limit

In most applications, the variation in ILIM must be taken

into account when determining RSET

. The ILIM variation is

due to processing variations from part to part, as well as

variations in the voltages at IN and OUT, plus the operat-

ing temperature. Together, these three factors add up to

a ±25% tolerance (see ILIM specification in "Electrical

Characteristics" section). Figure 1 illustrates a cold

device with a statistically higher current limit and a hot

device with a statistically lower current limit, both with

RSET equal to 10.5k. While the chart, "RSET vs. ILIM" indi-

cates an ILIM of 0.7A with an RSET of 10.5k, this figure

shows that the actual current limit will be at least 0.525A

and no greater than 0.875A.

0.2

0.4

0.6

0.8

1.2

012345

OUT

(V)

Normalized Current Limit (A)

-40°C

85°C

0.88A

0.53A

Figure 1: Current Limit at High and Low

Temperature Using 10.5kΩ

To determine RSET

, start with the application required cur-

rent limit as the minimum current limit value and multi-

ply it by 1.33 to derive the typical current limit value.

Next, refer to Table 1 to find the approximate RSET value.

For greater precision, use the small current limit range

linear approximation to calculate RSET value. For exam-

ple, for 500mA current limit requirement, first calculate

the typical current limit: 500 · 1.33 = 665mA. Then refer

to Table 1; the nearest small current limit range is

600mA to 700mA with 100mA current limit interval and

0.45kV RSETILIM coefficient interval. Then adopt the meth-

od of linear approximation in small range to calculate the

RSETILIM coefficient.

RSET · ILIM = 7.8 - = 7.51kV

0.45 · (665 - 600)

100

So,

RSET = = 11.3kΩ

7.51kV

665mA

RSET (kΩ)I

LIM Typ. (mA)

RSET∙ILMT

Coefﬁ cient (kV)

16.2 500 8.10

14.7 550 8.09

13.0 600 7.80

10.5 700 7.35

8.87 800 7.10

7.50 900 6.75

6.81 1000 6.81

6.04 1100 6.64

5.49 1200 6.59

4.99 1300 6.49

4.64 1400 6.50

Table 1: Current Limit Standard RSET Values.

Input Capacitor

The input capacitor CIN protects the power supply from

current transients generated by the load attached to the

AAT4614. When a short circuit is suddenly applied to the

output of the AAT4614, a large current, limited only by

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

before the current limit circuitry activates. (See the curve

“Short Circuit Through 0.3” in the "Typical Characteristics"

section of this datasheet.) 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 AAT4614. The extremely fast short-circuit

response time of the AAT4614 reduces the size require-

ment for 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.

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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

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Output Capacitor

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

low capacitance (approximately 0.47F) is required. No

matter how large the output capacitor, output current is

limited to the value set by the AAT4614 current limiting

circuitry, so very large output capacitors can be used.

For example, USB ports are specified to have at least

120F of capacitance downstream from their controlling

power switch. The current limiting circuit will allow an

output capacitance of 1000F or more without disturbing

the upstream power supply.

ON/ON(Enable Input)

In many systems, power planes are controlled by inte-

grated circuits which run at lower voltages than the

power planes themselves. The enable input (ON) of the

AAT4614 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.

Both active high and active low options are available for

all packages.

Connecting to Capacitive Load

When switching the AAT4614 onto a capacitive load, the

AAT4614 will charge the output capacitive load at a rate

no greater than the current limit setting.

FAULT Output

The FAULT Flag (FLT) is provided to alert the system if an

AAT4614 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

an approximately 100 resistor. The filtering of voltage

or current transients of less than 4ms prevents capacitive

loads connected to the AAT4614 output from activating

the FAULT Flag when they are initially attached. Pull-up

resistances of 1k to 100k are recommended. Since

FLT 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.

The FLT Pin is not available for the SOT23-5 package.

Thermal Considerations

Since the AAT4614 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) = IMAX2OUT-SW(MAX) · 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

AAT4614 at high temperature. RJA is the thermal resis-

tance between the AAT4614 die and the board onto

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

that the PCB under the AAT4614 would be if the AAT4614

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 AAT4614's 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 = = 0.93(A)

115 - 85

0.23 · 150

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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Evaluation Board PCB Layout

Figure 2: AAT4614 Evaluation Board Layout Figure 3: AAT4614 Evaluation Board Layout for

for SOT23-6 and SOT23-5 Package (Top View). SOT23-6 and SOT23-5 Package (Bottom View).

Figure 4: AAT4614 Evaluation Board Layout Figure 5: AAT4614 Evaluation Board Layout

for SC70JW-8 Package (Top View). for SC70JW-8 Package (Bottom View).

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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

201939A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

Evaluation Board Schematic

AAT4614

OUT

GND

FLT

3ON/ON 4

SET 5

IN 6

JP1

OUT

TP1

GND

TP2

FAULT/SET

TP3

TP4

SET

TP5

TP6

1μF

0.47μF

6.8K

100K

Note: Do Not Solder R3 for SOT23-6 Device;

Do Not Solder R1,R2 for SOT23-5 Device

Figure 6: AAT4614 Evaluation Board Schematic for SOT23-6 and SOT23-5 Package.

JP1

OUT

TP1

GND

TP2

TP3

TP4

SET

TP5

TP6

6.8K C1

1μF

0.47μF

100K

FLT

ON/ON

SET

4OUT 5

GND 6

GND 7

GND 8

U1 AAT4614

FAULT

Figure 7: AAT4614 Evaluation Board for SC70JW-8 Package.

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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Component Part Number Description Manufacturer

C1 GRM219R61A475KE19 CAP Ceramic 1F 10V X5R 10% 0603 Murata

C2 GRM219R61A475KE19 CAP Ceramic 0.47F10V X5R 10% 0805 Murata

JP1 Device Enable/Disable Selector

R1 Chip Resistor 6.8K, 1/16W 1% 0603 SMD Vishay

R2 Chip Resistor 100K, 1/16W 1% 0603 SMD Vishay

R3 Chip Resistor 6.8K, 1/16W 1% 0603 SMD, for SOT23-5 package device only Vishay

TP1 5010K-ND OUT Keystone

TP2 5011K-ND GND Keystone

TP3 5010K-ND FAULT (SOT23-6) / SET (SOT23-5) Keystone

TP4 5010K-ND IN Keystone

TP5 5010K-ND SET (for SOT23-6 only) Keystone

TP6 5010K-ND ON/ON Keystone

U1 AAT4614AI(GU/GV/JS)-(1/2)-T1 Load Switch Skyworks

Table 2: AAT4614 Evaluation Board Bill of Materials (BOM).

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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

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Ordering Information

Enable Input Package Marking1Part Number (Tape and Reel)2

Active High SOT23-6 5BXYY AAT4614IGU-2-T1

Active High SOT23-5 5CXYY AAT4614IGV-2-T1

Active Low SOT23-6 8YXYY AAT4614IGU-1-T1

Active Low SOT23-5 9GXYY AAT4614IGV-1-T1

Active Low SC70JW-8 AAT4614IJS-1-T1

Active High SC70JW-8 5DXYY AAT4614IJS-2-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

SOT23-6

1.90 BSC

0.95 BSC

0.45

0.15 0.10 BSC

2.85

0.15

0.075

0.40

0.10

1.575

0.125

1.20

0.25

1.10

0.20

2.80

0.20

0.15

0.07

GAUGE PLANE

0.60 REF

All dimensions in millimeters.

1. XYY = assembly and date code.

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

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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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

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.

AAT4614

DATA SHEET

Adjustable Current Limited Load Switch with Fault Flag

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

201939A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 14, 2012

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