AAT4625IHS-1-T1 - AnalogicTech

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

4625.2009.11.1.2 1

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General Description

The AAT4625 SmartSwitch is part of AnalogicTech’s

Application Specific Power MOSFET™ (ASPM™) product

family. It is a 1.0A current limited P-channel MOSFET

power switch designed for high-side load-switching

applications. This switch operates with inputs ranging

from 2.7V to 5.5V, making it ideal for both 3V and 5V

systems. An integrated current-limiting circuit protects

the input supply against large changes in load current

which may cause the supply to fall out of regulation. The

AAT4625 is also protected from thermal overload which

limits power dissipation and junction temperatures. The

current limit threshold is factory programmed at 1.5A,

with a maximum of 2.0A. The quiescent supply current

is typically a low 16μA. In shutdown mode, the supply

current decreases to less than 1μA.

The AAT4625 is available in Pb-free, 8-pin SOP, TSSOP,

or MSOP packages, and is specified over the -40°C to

+85°C temperature range.

The AAT4600 series is a family of adjustable and fixed

SmartSwitch products with a range of current handling

capabilities. Single versions with adjustable current limit

(AAT4601) or fixed current limit (AAT4625) as well as dual

versions with fixed current limit (AAT4626) are available.

Features

• Compliant with USB 1.1 and 2.0 Specifications

• 2.7V to 5.5V Input Voltage Range

• 1.0A Minimum Continuous Current

• 2.0A Maximum Current Limit

• 60mΩ Typical RDS(ON)

• Low Quiescent Current:

▪ Typically 16μA

▪ 1μA Maximum with Switch Off

• Thermal Shutdown

• Slew Rate Limited Turn On

• Fault Flag with 10ms Blanking

• Under-Voltage Lockout (UVLO)

• Temperature Range: -40°C to +85°C

• UL Approved—File No. E217765

• 8-Pin SOP, TSSOP, or MSOP Package

Applications

• General Purpose Power Switching

• Hot Swap Supplies

• Notebook Computers

• USB Ports and Peripherals

UL Recognized Component

Typical Application

120μF

GNDGND

OUTPUT

OUT

EN (EN)EN (EN)

0.1μF

VCC 5.0V

100k

FLG

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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Pin Descriptions

Pin # Symbol Function

1 EN (EN) Enable input: logic-compatible enable input. High input > 2.1V typical. Low input < 1.9V typical. Active

high or active low option available; see Ordering Information for details.

2FLG Fault ﬂ ag output: active-low, open-drain output. Indicates over-current, UVLO, and thermal shutdown.

3 GND Ground.

4,5 NC Not internally connected.

6,8 OUT Switch output: These pins are the P-channel MOSFET drain connection.

7IN

Supply input: This pin is the P-channel MOSFET source connection. Also supplies the IC’s internal cir-

cuitry.

Pin Configuration

SOP-8

TSSOP-8

MSOP-8

(Top View)

1 2

OUT

EN (EN)

FLG

GND

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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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 an FR4 printed circuit board.

Absolute Maximum Ratings1

TA = 25°C, unless otherwise noted.

Symbol Description Value Units

VIN IN to GND -0.3 to 6 V

VFLG FLG to GND -0.3 to 6 V

IFLG FLG Current 50 mA

VOUT OUT to GND -0.3 to VIN + 0.3 V

IOUT Output Current (Internally Limited) 2.0 A

VEN EN to GND -0.3 to 6 V

TSStorage Temperature 150 °C

TLEAD Maximum Soldering Temperature (at Leads) 300 °C

Thermal Information2

Symbol Description Value Units

ΘJA Maximum Thermal Resistance

SOP-8 120

°C/WTSSOP-8 150

MSOP-8 150

PDMaximum Power Dissipation

SOP-8 1.0 W

TSSOP-8 833 mW

MSOP-8 833

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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Electrical Characteristics

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

perature range.

Symbol Description Conditions Min Typ Max Units

VIN Operation Voltage 2.7 5.5 V

IQQuiescent Current VIN = 5V, EN = Active 16 30 μA

IQ(OFF) Off Supply Current VIN = 5.5V, EN (EN) = Inactive 1μA

VEN-THRSH Enable Input Threshold Low-to-High Transition 2.4 V

High-to-Low Transition 0.8

IEN Enable Input Current VEN = 0V to 5.5V 0.01 1μA

CEN Enable Input Capacitance 1pF

RDS(ON) On-Resistance VIN = 5V, TA = 25°C 60 100 mW

VIN = 3.0V, TA = 25°C 70 115

TON Output Turn-On Delay VIN = 5V, RL = 10W 0.25 ms

TON-RISE Output Turn-On Rise Time VIN = 5V, RL = 10W 0.2 ms

TOFF Output Turn-Off Delay VIN = 5V, RL = 10W 5 20 μs

TOFF-FALL Output Turn-Off Fall Time VIN = 5V, RL = 10W 20 μs

ISD(OFF) Output Leakage Current EN = Inactive, VIN = 5.5V, VOUT = 0V 0.03 15 μA

ILIMIT Current Limit Threshold Ramped Load Applied to Enable Output, VOUT < 4.0V 1.0 1.5 2.0 A

OTMP Over-Temperature Shutdown TJ Increasing 125 °C

TJ Decreasing 115

RFLG Error Flag Output Resistance VIN = 5V, IL = 1mA 30 W

ISINK Error Flag Off Current VFLG = 5.5V 0.05 1μA

VUVLO Under-Voltage Lockout VIN = Increasing, 1% Hysteresis 2.0 2.3 2.7 V

TBLANK FAULT Blanking 10 ms

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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Typical Characteristics

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

Quiescent Current vs. Temperature

-40 -20 0 20 40 60 80 100 120

Temp

Quiescent Current (

erature (

Quiescent Current

0123456

Input Voltage (V)

Input Current (

Current Limit

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

012345

Output Voltage (V)

Output Current (A)

Off-Supply Current vs. Temperature

0.0010

0.0100

0.1000

1.0000

-40 -20 0 20 40 60 80 100 120

Temperature (

Off-Supply Current (

Off-Switch Current vs. Temperature

0.0000

0.0001

0.0010

0.0100

0.1000

1.0000

-40 -20 0 20 40 60 80 100 120

Temperature (

Off-Switch Current (

Turn On/Off Response with 10

F Load

Time (100

s/div)

5V/div

FAULT

5V/div

VOUT

2V/div

IIN

200mA/div

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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Typical Characteristics

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

Start Into 1

Load

Time (1ms/div)

5V/div

FAULT

5V/div

VOUT

1V/div

IIN

500mA/div

Thermal Shutdown Response

Time (50ms/div)

5V/div

FAULT

5V/div

VOUT

1V/div

IIN

500mA/div

Short-Circuit Through 0.3

-1012345

Tim

Input and Output Voltage (V)

Output Current (A)

-4

Inpu t Voltage

Out put Current

Out put Voltage

-1012345

Time (

-3

Input Voltage

Output Current

Output Voltage

Short-Circuit Through 0.6

Input and Output Voltage (V)

Output Current (A)

RDS(ON) vs. Temperature

40.0

45.0

50.0

55.0

60.0

65.0

70.0

75.0

80.0

-40 -20 0 20 40 60 80 100 120

Temperature (

RDS(ON) (m

)

VCC = 3V

VCC = 5V

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

4625.2009.11.1.2 7

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Functional Block Diagram

1.2V

Reference

Current

Limit

Over-Temperature

Protection

Under-

voltage

Lockout

EN (EN)

GND

FLG

OUT

Functional Description

The AAT4625 is an integrated MOSFET load switch with

a fixed current limit, over-temperature protection, level

shifted input, and a fault flag. The current limit control is

combined with an over-temperature thermal limit circuit

to provide a comprehensive system to protect the load

switch under short-circuit or other adverse operating

conditions. The AAT4625 is ideally suited for control and

protection of peripheral ports such as USB, RS232, and

parallel ports.

The current limit and over-temperature circuits will act

independently. The device current limit is activated when

the output load current exceeds a preset internal thresh-

old level. The minimum current limit threshold charac-

teristic is specified by ILIM(MIN). If the load switch ambient

temperature becomes excessive or if a short-circuit con-

dition persists, the die temperature will rise, causing the

over-temperature protection circuit to activate.

If the current limit or over-temperature protection cir-

cuits are active for more than two milliseconds, the sys-

tem will be informed via the FAULT flag. A 10ms fault

blanking delay allows the AAT4625 to be turned on into

large capacitive loads without activating the FAULT flag.

The open drain FAULT output can be connected directly to

system controllers driven by voltage levels less than the

IN pin voltage without additional level shifting circuitry.

The load switch is turned on and off by applying a logic

level signal to the EN pin. The AAT4625 enable function

is available in both active high and active low logic level

versions. The AAT4625 typically consumes 16μA when

operating; when off, the device draws less than 1μA. In

the off state, current is prevented from flowing between

the input and output. The EN function has logic level

thresholds that allow the AAT4625 to be TTL compatible

and may also be controlled by 2.5V to 5.0V CMOS cir-

cuits. The voltage level on either EN or FAULT should not

exceed the input supply level present on the IN pin.

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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Applications Information

Operation in Current Limit

If an excessive load is applied to the output of the

AAT4625, the load current will be limited by the device’s

current limit circuitry. Refer to the “Current Limit” curve

in the Typical Characteristics section of this datasheet. If

a short circuit were to occur on the load, there would be

a demand for more current than allowed by the internal

current limiting circuit and the voltage at the device out-

put will drop. This causes the AAT4625 to dissipate more

power than in normal operation, causing the die tempera-

ture to increase. When die temperature exceeds the inter-

nal over-temperature threshold, the AAT4625 will shut

down. After shutting down, the AAT4625 cools to a level

below the over-temperature threshold, at which point it

will start up again. The AAT4625 will continue to cycle off

and on until one of the following events occurs: the load

current is reduced to a level below the AAT4625’s current

limit setting; the input power is removed; or the output is

turned off by a logic high level applied to the EN pin.

Thermal Considerations

Since the AAT4625 has internal current limit and over-

temperature protection, junction temperature is rarely a

concern. If an application requires a large load current in

a high-temperature operating environment, there is the

possibility that the over-temperature protection circuit

(rather than the current limit circuit) will regulate the

current available to the load. In these applications, the

maximum current available without risk of activation of

the over-temperature circuit can be calculated. The

maximum internal 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

AAT4625 at high temperature. RθJA is the thermal resis-

tance between the device die and the board onto which it

is mounted. TA(MAX) is the maximum ambient temperature

for the printed circuit board assembly under the AAT4625

when the load switch is not dissipating power. Equation 1

can be transformed to provide IMAX; Refer to Equation 2.

Eq. 2: =

IMAX

TSD(MIN) - TA(MAX)

RDS(ON)(MAX) · RΘJA

TSD(MIN) is the minimum temperature required to activate

the device over-temperature protection. The typical

thermal limit temperature specification is 125°C for the

AAT4625; for calculations, 115°C is a safe minimum

value.

For example, a portable device is specified to operate in

a 50°C environment. The printed circuit board assembly

will operate at temperatures as high as 85°C. This por-

table device has a sealed case and the area of the

printed board assembly is relatively small, causing RθJA to

be approximately 120°C/W. Using Equation 2,

IMAX = 1.4

115 - 85

130 · 120

If this system requires less than 1.4A, the thermal limit

will not activate during normal operation.

Input Capacitor

The input capacitor serves two purposes. First, it pro-

tects the source power supply from transient current

effects generated by the application load circuit. If a

short circuit is suddenly applied to the output of an

AAT4625, there is a microsecond long period during

which a large current can flow before the current limit

circuit becomes active. Refer to the characteristic curve

“Short Circuit Through 0.3Ω." A properly sized input

capacitor can dramatically reduce the load switch input

transient response effects seen by the power supply and

other circuitry upstream from the AAT4625.

The second purpose of the input capacitor is to prevent

transient events generated by the load circuit from

affecting the operation of the AAT4625. For example, if

an AAT4625 is used in a circuit that operates from a 5V

power supply with poor step load response, turning on

the load switch could cause the input power supply to

drop below the AAT4625's under-voltage lockout thresh-

old. This drop in voltage would cause the AAT4625 to

turn off until the input power supply voltage level recov-

ers. Since this cycle would be self-perpetuating, the

entire circuit could be seen to be unstable. In the very

rare case where capacitor cost is prohibitive and the

input capacitor is omitted, the output load circuit should

be slew rate limited when turned on.

Output Capacitor

In order to insure stability while the device current limit

is active, a small capacitance of approximately 1μF

should be used. When the AAT4625 is activated using

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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10kΩ

100kΩ

0.1μF

AAT4625

FLG

GND

NC NC

OUT

V+

USB Controller

Over-Current

Flag Input

Figure 1: Fault Flag Delay RC Filter.

the ON function, there are no momentary current tran-

sients, as in the case when a short circuit is suddenly

applied to a device that is already on. Refer to the “Turn-

On/Off Response” characteristics curve. Regardless of

output capacitor size, output current is limited to the

value allowed by the threshold determined by the inter-

nal current limiting circuitry. Refer to the internal current

limit threshold specifications stated in the Electrical

Characteristics section of this datasheet. This permits

very large output capacitors to be used.

For example, USB ports are specified to have at least

120μF of downstream capacitance from their controlling

power switch. An output capacitance as large as 1000μF

would not disturb the input power supply to an AAT4625

used to control a USB port.

EN Input

The AAT4625 is available in both active high and active

low enable versions. For specific part numbers, refer to

the Ordering Information section of this datasheet. When

the AAT4625 is in the off state, the output is an open

circuit and the device quiescent current consumption is

reduced to less than 1μA. The EN threshold voltage is set

to allow the AAT4625 to be controlled by 5V TTL levels,

as well as CMOS-compatible levels ranging from 2.5V to

5V. The EN function control voltage level should not

exceed the input supply level applied to the IN pin.

Fault Flag Output

The AAT4625 features an active low fault flag output. The

fault flag is provided to alert the system if the over-cur-

rent or over-temperature circuits become active or if the

load switch is not receiving a sufficient voltage level to

properly operate. If either the current limit or over-tem-

perature circuits in any combination are constantly active

for more than approximately 10ms, the FAULT pin is

pulled to ground internally through an open drain device.

The 10ms delay on the FAULT function is intended to

prevent capacitive loads connected to the load switch

output from activating the FAULT flag when the device is

turned on. The placement of a pull-up resistor between

the FAULT pin and the IN pin is recommended. Reasonable

values for the pull-up resistor should range from 10kΩ to

100kΩ. Since the FAULT flag is an open drain terminal, it

may be pulled up to any voltage that is not greater than

the level present on the IN pin. This is done to allow the

AAT4625 to signal ancillary circuitry that is powered by

voltage levels less than the level on the IN pin.

If a fault flag delay greater than 10ms is required, addi-

tion delay may be added by use of an RC filter. An RC

filter can be added to the fault flag output, as shown in

Figure 1.

Reverse Voltage

The AAT4625 is designed to control current flowing from

IN to OUT. If a voltage is applied to OUT which is great-

er than that on IN, a large reverse current may flow,

potentially damaging the device.

Under-Voltage Lockout

The AAT4625 has been designed with an under-voltage

lockout control circuit. The under-voltage lockout pre-

vents the output MOSFET device from turning on until VIN

exceeds the typical UVLO threshold of 2.3V. During

operation, the device will automatically shut down if VIN

falls below the UVLO threshold and the fault flag will be

toggled.

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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0.1μF

AAT4625

FLG

GND

NC NC

OUT

BULK

(120μF)

Card

Application

Circuit

GND Inrush Current Protected

Application Card

Cable / Connector

to Hot-Plug Port

BUS

GND

Hot-Plug

Receptacle

Figure 2: AAT4625 Inrush Current Protected Application.

Trace Resistance

0.01Ω

(5mV)

CBULK 0.1μF CBULK 0.1μF

Cable, Connector,

and Contact

Resistance

0.03Ω

(15mV)

V+

GND

Input

Power Supply

4.50V to 5.25V

P-Channel MOSFET

Switch On Resistance

0.06Ω

(30mV)

AAT4625

Ferrite Bead

and PCB Trace

Resistance

0.02Ω

(10mV)

VBUS

GND

Downstream

Peripheral Port

500mA Max.

Load Current

Total Voltage Drop = 60mV

Figure 3: Summary of Typical Circuit Voltage Drops Caused by AAT4625

Circuit Components and PCB Trace Resistance.

Hot-Plug Applications

Application circuit cards with a high inrush current poten-

tial can be limited by use of the AAT4625. The AAT4625

has both slew rate limited turn-on characteristics and a

current limit controlled output which make it ideally suited

for power port hot-plug applications. A host power back

plane or hot-plug receptacle may be sensitive to short

duration, high power surges. The AAT4625 will turn on in

a linear ramping fashion and regulate the inrush current

within the specified current limit for the device. The error

flag usually will not be affected during application turn-on,

since the 10ms flag blanking time is intended for these

types of events. If an application turn-on current surge

exceeds 10ms, an RC delay filter may be added to the flag

output to prevent the system from receiving an error dur-

ing the start-up sequence (see Figure 2).

PCB Layout Information

In order to obtain maximum performance from the

AAT4625, very careful consideration must be given to

the printed circuit board layout. In most port power

switch and port protection applications, high voltage and

current transient events will occur. Proper PCB layout can

help reduce the effects of transient events. PCB trace

resistance will affect overall circuit transient response; in

addition, small voltage drops will be incurred.

Refer to the following guidelines for power port PCB lay-

out:

1. PCB traces should be kept as short and direct as pos-

sible to minimize the effects of the PCB on circuit

performance.

2. Make component solder pads large to minimize con-

tact resistance.

3. The AAT4625 output bulk capacitor and ferrite beads

should be placed as close to the device as possible.

PCB traces to the output connector should be kept as

short as possible to minimized trace resistance and

the associated voltage drop (I2R loss).

4. If ferrite beads are used in the circuit, select ferrite

beads with a minimum series resistance.

5. The use of PCB trace vias should be avoided on all

traces that conduct high currents. If vias are neces-

sary, make the vias as large as possible and use

multiple vias connected in parallel to minimize their

effect.

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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Figure 4: AAT4625 Evaluation Board Figure 5: AAT4625 Evaluation Board

Component Side Layout. Solder Side Layout.

Figure 6: AAT4625 Evaluation Board Top Side

Silk Screen Layout/Assembly Drawing.

Evaluation Board Layout

The AAT4625 evaluation layout (shown in Figures 4, 5,

and 6) follows the recommend printed circuit board lay-

out procedures and can be used as an example for good

application layouts. Note that ferrite beads are not used

on this simple device evaluation board. The board layout

shown is not to scale.

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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Application Circuits

CIN

0.1μFR1

100kΩ

On/Off

Error Flag

USB Controller

AAT4625

VBUS = 5.0V IN OUT

FLG

EN(EN)

6,8

4,5

COUT1

0.1μFCOUT2

120μF

DATA

D+

D-

VBUS

GND

Ferrite Beads

Figure 7: Typical USB Host Port Application.

120μF0.1μF

100kΩ

1μF1μF

AAT3220-3.3 3.3V USB Controller AAT4625 Ferrite Beads

Vcc

5.0V

Data Data

BUS

D+

D-

GND

BUS

D+

D-

GND

USB Port

4.50V to 5.25V

Upstream V

BUS

100mA Maximum

VIN ON/OFF

Over-Current

Flag

IN OUT

GND GND

EN OUT

FLG

GND

NC NC

OUT

Figure 8: Self-Powered Single Port USB Hub.

120μF0.01μF

100kΩ

1μF1μF

AAT3220-3.3 3. 3V USB Controller AAT4625 Ferrite Beads

Data Data

BUS

D+

D-

GND

BUS

D+

D-

GND

USB PortUSB Host

VIN ON/OFF

Over-Current

Flag

IN OUT

GND GND

EN OUT

FLG

GND

NC NC

OUT

Figure 9: USB Bus Powered Single Port USB Hub.

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

4625.2009.11.1.2 13

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1. XYY = assembly and date code.

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

Ordering Information

Package Enable Marking1Part Number (Tape and Reel)2

SOP-8 EN (Active-high) 4625-1 AAT4625IAS-1-T1

SOP-8 EN (Active-low) 4625 AAT4625IAS-T1

TSSOP-8 EN (Active-low) 4625 AAT4625IHS-T1

MSOP-8 EN (Active-high) DDXYY AAT4625IKS-1-T1

MSOP-8 EN (Active-low) DCXYY AAT4625IKS-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/aboutus/quality.php.

Package Information

SOP-8

0.175 ±

0.075 6.00

0.20

3.90

0.10

1.55

0.20

1.27 BSC0.42

0.09

4.90

0.10

0.375

0.125

0.235

0.045

0.825

0.445

All dimensions in millimeters.

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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TSSOP-8

DETAIL A

4.40

0.10

6.40

0.20

0.65 BSC

3.00

0.10

0.245

0.055

8 0.10

0.05

0.60

0.15

0.145

0.055

1.05 MAX

1.20 MAX

REF

1.00

REF

MSOP-8

PIN 1

1.95 BSC

0.254 BSC

0.155

0.075

0.60

0.20

3.00

0.10

0.95

0.15

0.95 REF

0.85

0.10

3.00

0.10

0.65 BSC 0.30

0.08

0.075

4.90

0.10

GAUGE PLANE

All dimensions in millimeters.

AAT4625

USB Single-Channel Power SwitchSmartSwitchTM

PRODUCT DATASHEET

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Phone (408) 737-4600

Fax (408) 737-4611

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