AAT3698IWO-4.2-2-T1 - Skyworks Solutions, Inc.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Typical Application

AAT3698-x

VIN

ON/OFF

BAT

ISET

INCHR

1μF

LDOOUT LDOOUT

ABI

ABO

TERM

NOBAT

Battery Pack

GND R3R4

R1R2

STAT

POK

1μF

10.9mm

11.5mm

U1 AAT3698-x

C1 GRM31MR71H105KA88

C2, C3 GRM188R61A225KE34

C4 GRM21BR71C105KA01L

R1 1.5kΩ, 5%, 1/4W, 0603

R2 1.5kΩ, 5%, 1/4W, 0603

R3 13.3kΩ, 1%, 1/4W, 0603

R4 1.58kΩ, 1%, 1/4W, 0603

General Description

The AAT3698-1/-2 BatteryManager™ is a single-cell lithi-

um-ion (Li-Ion)/Li-Polymer battery charger IC designed

to operate from a USB port or AC adapter with an input

voltage of up to 7.0V. For increased safety, the AAT3698-

1/-2 also includes over-voltage input protection (OVP)

up to 28V.

The AAT3698-1/-2 precisely regulates battery voltage

for 4.2V Li-Ion/Polymer battery cells through a low

RDS(ON) switch. The charging current can be set by an

external resistor up to 1.6A. If an over-voltage condition

occurs from the input, the series switch quickly opens

and a fault flag is activated, preventing damage to the

battery and the charging circuitry.

Other fault conditions are monitored in real time. In case

of an over-current, battery over-voltage, short circuit, or

over-temperature failure, the device will automatically

shut down, thus protecting the charging device, control

system, and the battery under charge. A status monitor-

ing output pin (STAT) is provided to indicate charging

activity. This open drain output pin can be used to drive

an external LED as a charging indicator.

The AAT3698-1/-2 also includes a 5.0V LDO linear regu-

lator with over-voltage protection that can supply loads

of up to 50mA.

The AAT3698-1/-2 is available in the Pb-free, thermally

enhanced, space-saving 3x3mm TDFN33-14 package and

is rated over the -40°C to +85°C temperature range.

Features

• USB or AC Adapter System Power Charger

• 3.0V ~ 7.0V Input Voltage Range

• Fast Over-Voltage Protection Turn Off

• OVP Trip Threshold: 7.25V (typ)

• High Level of Integration with Internal:

 Power Device

 Reverse Current Blocking

 Current Sensing

• 5V/50mA LDO Output

• Programmable Fast Charge Current from 50mA to

1.6A

• Programmable Charge Termination Current

• Charge Status Indicator

• Power OK Indicator

• Battery Absence Detection Input Pin

• Automatic Termination and Recharge Sequencing

(AAT3698-1 Only)

• Automatic Trickle Charge For Battery Pre-Conditioning

• Emergency Thermal Shutdown Protection

• Digitally Controlled Thermal Loop Regulation

• Active Low Enable with Internal 200k Pull-Down

Resistor

• Output for Auto-Booting

• 14-pin 3x3mm TDFN Package

Applications

• Bluetooth™ Headsets, Headphones, Accessories

• Digital Still Cameras

• Mobile Telephones

• Personal Data Assistants (PDAs)

• MP3 Players

• Other Lithium-Ion/Polymer Battery-Powered Devices

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Pin Description

Pin # Name Type Function

1 INCHR I/O OVP output switch and battery charger input; decouple to GND with 1F capacitor.

2 IN I Input from USB port or adapter connector.

3 LDOOUT O 5V/50mA LDO output through OVP device; bypass to GND with 1F capacitor.

4POK O Power OK ﬂ ag pin; open drain, active low.

5STAT O Charge status indicator pin; open drain, active low.

6 ABO O Auto booting output.

7 TERM I

Connect the RTERM resistor between the TERM pin and ground to set the charge termination

current. When the TERM pin is connected to INCHR, charge current termination level is set

to 10% of the programmed fast charge current.

8 GND I Power ground.

9EN I Enable pin, active low. Internally connected to ground through a 200k pull-down resistor.

10 ISET I Connect RSET resistor to this pin to set charging current. Connect a 10k resistor from this

pin to the system to monitor this pin's voltage.

11 IC I Internally connected; connect this pin to ground.

12 NOBAT I No battery detection input. If the NOBAT pin is left unconnected, charging is disabled. Inter-

nally pulled to LDOOUT pin through a 1.6M pull-up resistor.

13 ABI I Auto booting input. Internally connected to ground through a 200k pull-down resistor.

14 BAT O Connect to Li-Ion battery.

EP Exposed paddle; connect to ground.

Pin Configuration

TDFN33-14

(Top View)

INCHR

LDOOUT

POK

STAT

ABO

BAT

ABI

NOBAT

ISET

TERM 7

GND

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 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. Mounted on an FR4 board.

Absolute Maximum Ratings1

Symbol Description Value Units

VIN IN continuous -0.3 to 30 V

VPINCHR, EN, STATB, POK, ABI, NOBAT -0.3 to 7.5 V

VNBAT, ISET, TERM, LODOUT, ABO, IC -0.3 to VINCHR + 0.3 V

TJJunction Temperature Range -40 to 150 °C

TAOperating Temperature Range -40 to 85 °C

TLEAD Maximum Soldering Temperature (at leads) 300 °C

Thermal Information2

Symbol Description Value Units

JA Maximum Thermal Resistance (TDFN33-14) 50 C/W

PDMaximum Power Dissipation 2 W

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

1. The AAT3698-1/-2 is guaranteed to meet performance specifications over the -40 to +85°C operating temperature range and is assured by design, characterization and cor-

relation with statistical process controls.

2. When no battery is connected, the BAT pin output voltage is regulated at 4.2V.

3. Internal Termination function is selected when VTREM > VEXTREM_DIS.

4. External Termination function is selected when VTREM < VEXTREM_EN.

Electrical Characteristics1

VIN = 5V, RSET = 3.16k, VENB = VNOBAT = 0V, CIN = 1F, C INCHR = 1F, C BAT = 1F, C LDOOUT = 1F, TERM = ABI = IC = open,

TA = -40 to +85°C, unless otherwise noted. Typical values are at TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Operation

VIN_MAX Input Over-Voltage Protection Range 28 V

VIN Normal Operating Input Voltage Range 3.0 7.0 V

IOP Operating Current VBAT = 4.3V, RSET = 15.8k300 450 A

ISD Charge Function Shutdown Supply Current VENB = 5V, VBAT = 4.3V 190 250 A

IBAT_LEAK Leakage Current from BAT Pin VBAT = 4V, IN Pin Open 2 5 A

Over-Voltage Protection

VOVP Over-Voltage Protection Trip Voltage VIN Rising Edge 7.05 7.25 7.45 V

VOVP_HYS Hysteresis 200 mV

VIN_BAT_OS VIN – VBAT Offset Voltage VIN Rising, VBAT = 4V 300 mV

VIN Falling, VBAT = 4V 200

VINCHR_DO Drop Out Voltage Between IN and INCHR Pins VIN = 5V, IBAT = 500mA, RSET = 1.58k200 mV

Battery Charger

VUVLO Under-Voltage Lockout Threshold VIN Rising Edge 2.6 2.8 3.0 V

VUVLO_HYS Hysteresis 200 mV

VCHG_DO

Drop Out Voltage Between INCHR and BAT

Pins

VIN = 4.2V, IBAT = 500mA, RSET =

1.58k100 mV

VBOVP Battery Over-Voltage Protection Threshold 4.4 V

BAT Pin Voltage Regulation

VCO(REG) Constant Regulated Output Voltage2RISET = 31.6k, IBAT = 10mA 4.20 V

VCO/VCO Constant Output Voltage Tolerance

RISET = 31.6k, IBAT = 10mA, TA= 25°C -0.5 +0.5

RISET = 31.6k, IBAT = 10mA, TA= -40

to +85°C -1 +1

VRCH

Battery Recharge Voltage Threshold

(AAT3698-1 only) VBAT falling VCO(REG)

- 0.1

VMIN Preconditioning Voltage Threshold VBAT rising 2.4 2.6 2.8 V

Current Regulation

ICC_RANGE Charge Current Programmable Range 100 1600 mA

ICH_CC Constant-Current Mode Charge Current

RSET = 15.8k, VBAT = 3.6V -15% 100 +15%

mARSET = 3.16k, VBAT = 3.6V -10% 500 +10%

RSET = 1.58k, VBAT = 3.6V -10% 1000 +10%

VISET ISET Pin Voltage VBAT = 3.6V TA = 25°C 1.97 2 2.03 V

TA = -40 to +85°C 1.9 2 2.1 V

ICH_TRK% Trickle Charge Current Ratio RSET = 3.16k, VBAT = 2.0V 5 10 20 % of

ICH_CC

KISET Charge Current Set Factor: ICH_CC/IISET

RSET = 15.8k, VBAT = 3.6V 790

RSET = 3.16k, VBAT = 3.6V 790

VTERM TERM Pin Voltage Range From off to full charge 0 2.0 V

VEXTERM_DIS External Termination Disable Threshold3VIN = 5V, measured on TERM pin 4.8 V

VEXTERM_EN External Termination Enable Threshold4VIN = 5V, measured on TERM pin 3.5 V

ITERM TERM Pin Output Current VTERM = 0.2V -10% 15 +10% A

ICH_TERM% Charge Termination Threshold Current Ratio VTERM = 0.2V or tied to INCHR pin 5 10 20 % of

ICH_CC

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

1. The AAT3698-1/-2 is guaranteed to meet performance specifications over the -40 to +85°C operating temperature range and is assured by design, characterization and cor-

relation with statistical process controls.

Electrical Characteristics (continued)1

VIN = 5V, RSET = 3.16k, VENB = VNOBAT = 0V, CIN = 1F, C INCHR = 1F, C BAT = 1F, C LDOOUT = 1F, TERM = ABI = IC = open,

TA = -40 to +85°C, unless otherwise noted. Typical values are at TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Logic Control / Battery Protection

VEN(H) Input High Threshold 1.2 V

VEN(L) Input Low Threshold 0.4 V

REN Input Pull Down Resistor 200 k

VNOBAT(H) Input High Threshold 1.2 V

VNOBAT(L) Input Low Threshold 0.4 V

RNOBAT Input Pull Up Resistor 1600 k

VABI(H) Input High Threshold VIN = 0V, VBAT = 4.2V 1.2 V

VABI(L) Input Low Threshold VIN = 0V, VBAT = 4.2V 0.4 V

RABI Input Pull Down Resistor 200 k

VABO(H) Output High Voltage VBAT = 4.2V, IABO = -5mA (sourcing) VBAT – 1V V

VABO(L) Output Low Voltage VBAT = 4.2V, IABO = 5mA (sinking) 0.4 V

VSTAT Output Low Voltage 0.4 V

ISTAT_OFF STAT Pin Leakage Current VSTAT = 5.5V, VEN = 5V 1 A

VPOK Output Low Voltage IPOK = 5mA 0.4 V

IPOK_OFF POK Pin Leakage Current VPOK = 5.5V, VIN = 7V 1 A

TOVPRES Over-Voltage Response Time VIN voltage step up from 6V to 8V, RLOAD =

100, CINCHR = 1F0.1 s

TOVPON

OVP Switch OVP Release Turn-On

Delay Time

VIN voltage step down from 8V to 6V, RLOAD =

100, CINCHR = 1F60 s

TDLY_POK

POK OFF Delay Time from Over-

Voltage

VIN voltage step up from 6V to 8V, RLOAD =

100, CINCHR = 1F0.1 s

TREDLY_POK

POK ON Delay Time from Over-

Voltage

VIN voltage step down from 8V to 6V, RLOAD =

100, CINCHR = 1F1.5 s

TOVPSTARTON

OVP Switch Startup Turn-On Delay

Time

VIN voltage step up from 0V to 5V, RLOAD =

100, CINCHR = 1F220 s

Thermal Protection

THREG Thermal Loop Regulation 110 ºC

THSHDN

Chip Thermal Shutdown

Temperature

Threshold 140 ºC

Hysteresis 15

5V LDO

VLDOOUT LDOOUT Voltage Tolerance VIN = 5.5V, ILDOOUT

= 0mA to 30mA

TA = 25°C 4.9 5.0 5.1 V

TA = -40 to +85°C 4.75 5.0 5.25

VDO Dropout Voltage from IN IOUT = 30mA, VIN = 5.0V 160 300 mV

IOUT_LIM LDO Output Current Limit VIN = 5.5V, VLDOOUT = 4.5V 55 90 125 mA

VLDOOUT_LR Line Regulation VIN = 5.4V to 6.4V, ILDOOUT = 30mA 10 mV

VLDOOUT_DM LR Dynamic Line Regulation IOUT = 30mA, VIN = 5.4V to 6.4V, TR/TF = 2s 200 mV

VLDOOUT_DM LD Dynamic Load Regulation IOUT = 1mA to 30mA, TR = <5s, VIN = 5.5V 60 mV

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Typical Characteristics−Battery Charger

Constant Charging Current vs.

RSET Resistor Values

RSET (KΩ

)

Constant Charging Current (mA)

100

1000

10000

1100.1 100

Operating Current vs. RSET Resistor Values

RSET (KΩ

)

Operating Current (mA)

1100.1 100

300

600

900

1200

1500

1800

2100

2400

Preconditioning Mode

Constant Current Mode

Battery Charging Current vs. Temperature

(RSET = 1.58KΩ; ICH_CC = 1000mA)

Temperature (°C)

Battery Charge Current (mA)

-15 10-40 35 60 85

900

920

940

960

980

1000

1020

1040

1060

1080

1100

Battery Charging Current vs. Temperature

(RSET = 3.16KΩ; ICH_CC = 500mA)

Temperature (°C)

Battery Charge Current (mA)

-15 10-40 35 60 85

450

460

470

480

490

500

510

520

530

540

550

Battery Charging Current vs. Input Voltage

(RSET = 1.58KΩ)

Input Voltage (V)

Battery Charging Current (mA)

4.3 4.64.0 4.9 5.2 5.5 5.8 6.1 6.4 6.7 7.0

700

750

800

850

900

950

1000

1050

VBAT = 3.3V

VBAT = 3.6V

VBAT = 3.9V

VBAT = 4.1V

Battery Charging Current vs. Input Voltage

(RSET = 3.16KΩ)

Input Voltage (V)

Battery Charging Current (mA)

4.3 4.64.0 4.9 5.2 5.5 5.8 6.1 6.4 6.7 7.0

400

420

440

460

480

500

520

540

560

VBAT = 3.3V

VBAT = 3.6V

VBAT = 3.9V

VBAT = 4.1V

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Typical Characteristics−Battery Charger

Battery Charging Current vs. Battery Voltage

Battery Voltage (V)

Battery Charging Current (mA)

2.5 2.82.2 3.1 3.4 3.7 4.0 4.3

200

400

600

800

1000

1200

RSET = 1.5KΩ

RSET = 1.96KΩ

RSET = 2.61KΩ

RSET = 3.16KΩ

RSET = 7.87KΩ

Shutdown Current vs. Input Voltage

Input Voltage (V)

Shutdown Current (μA)

5.5 6.05.0 6.5 7.0

100

140

180

220

260

300

85°C

25°C

-40°C

Preconditioning Charge Current

vs. Temperature

(RSET = 1.58KΩ; ICH_CC = 1000mA)

Temperature (°C)

Preconditioning Charge

Current (mA)

-15 10-40 35 60 85

102

106

110

Preconditioning Charge Current

vs. Temperature

(RSET = 3.16KΩ; ICH_CC = 500mA)

Temperature (°C)

Preconditioning Charge

Current (mA)

-15 10-40 35 60 85

Constant Output Voltage vs. Temperature

(RSET = 1.58KΩ; ICH_CC = 1000mA)

Temperature (°C)

Constant Output Voltage (V)

-15 10-40 35 60 85

4.10

4.13

4.16

4.19

4.22

4.25

4.28

4.31

Constant Output Voltage vs. Temperature

(RSET = 3.16KΩ; ICH_CC = 500mA)

Temperature (°C)

Constant Output Voltage (V)

-15 10-40 35 60 85

4.10

4.13

4.16

4.19

4.22

4.25

4.28

4.31

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Typical Characteristics−Battery Charger

Enable Low Voltage vs. Input Voltage

Input Voltage (V)

Enable Low Voltage (V)

5.4 5.85.0 6.2 6.6 7.05.6 6.05.2 6.4 6.8

0.68

0.70

0.72

0.74

0.76

0.78

0.80

85°C

25°C

-40°C

Enable High Voltage vs. Input Voltage

Input Voltage (V)

Enable High Voltage (V)

5.4 5.85.0 6.2 6.6 7.05.6 6.05.2 6.4 6.8

0.880

0.885

0.890

0.895

0.900

0.905

0.910

85°C

25°C

-40°C

Battery Recharge Voltage Threshold

vs. Temperature

(RSET = 1.58KΩ; ICH_CC = 1000mA; AAT3698-1)

Temperature (°C)

Battery Recharge

Voltage Threshold (V)

-15 10-40 35 60 85

4.00

4.02

4.04

4.06

4.08

4.10

4.12

4.14

4.16

4.18

4.20

Battery Recharge Voltage Threshold

vs. Temperature

(RSET = 3.16KΩ; ICH_CC = 500mA; AAT3698-1)

Temperature (°C)

Battery Recharge

Voltage Threshold (V)

-15 10-40 35 60 85

4.00

4.02

4.04

4.06

4.08

4.10

4.12

4.14

4.16

4.18

4.20

Typical Characteristics−OVP

OVP On Time

(RLOAD = 100Ω)

Time (50μs/div)

Input Voltage (top) (V)

INCHR Voltage (bottom) (V)

5.0

6.0

7.0

8.0

9.0

-2

OVP Response Time

(RLOAD = 100Ω)

Time (50μs/div)

Input Voltage (top) (V)

INCHR Voltage (bottom) (V)

5.0

6.0

7.0

8.0

9.0

-2

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Typical Characteristics−OVP

OVP Trip Point Threshold Voltage

vs. Temperature

Temperature (°C)

OVP Trip Point

Threshold Voltage (V)

-15 10-40 35 60 85

6.95

7.00

7.05

7.10

7.15

7.20

7.25

Rising Threshold

Falling Threshold

POK ON Delay Time

(RLOAD = 100Ω)

Time (2μs/div)

Input Voltage (top) (V)

POK Voltage (bottom) (V)

6.0

7.0

8.0

9.0

-4

-2

Typical Characteristics−LDO

LDO Load Transient

(VIN = 5.4V; IOUT = 1mA to 30mA; COUT = 1μF)

Time (100μs/div)

Output Current

(top) (mA)

Output Voltage

(bottom) (mV)

-100

-50

100

LDO Load Transient

(VIN = 5.4V; IOUT = 10mA to 30mA; COUT = 1μF)

Time (100μs/div)

Output Current

(top) (mA)

Output Voltage

(bottom) (mV)

-100

-80

-60

-40

-20

-100

-50

100

150

200

250

300

LDO Line Transient

(VIN = 5.4V to 6.4V; IOUT = 30mA; COUT = 1μF)

Time (100μs/div)

Input Voltage

(top) (V)

Output Voltage

(bottom) (V)

4.6

4.7

4.8

4.9

5.1

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Typical Characteristics−LDO

LDO Output Voltage Accuracy vs. Temperature

(IOUT = 10mA)

Temperature (°C)

LDO Output Voltage Error (%)

-15 10-40 35 60 85

-0.500

-0.400

-0.300

-0.200

-0.100

0.000

0.100

0.200

0.300

0.400

0.500

LDO Output Voltage vs. Temperature

(IOUT = 10mA)

Temperature (°C)

LDO Output Voltage (V)

-15 10-40 35 60 85

4.980

4.985

4.990

4.995

5.000

5.005

5.010

LDO Output Voltage Accuracy vs. Input Voltage

(IOUT = 30mA)

Input Voltage (V)

Output Voltage Error (%)

5.4 5.65.2 5.8 6.0 6.2 6.4 6.6 6.8 7.0

-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

85°C

25°C

-40°C

LDO Output Voltage Accuracy vs. Output Current

(VIN = 5.5V)

Output Current (mA)

LDO Output Voltage Error (%)

1.00.1 10 100

-1

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

0.8

85°C

25°C

-40°C

Dropout Voltage vs. Output Current

Output Current (mA)

Dropout Voltage (mV)

51001520253035

100

150

200

250

85°C

25°C

-40°C

Dropout Voltage vs. Temperature

(IOUT = 30mA)

Temperature (°C)

Dropout Voltage (mV)

-15 10-40 35 60 85

100

150

200

250

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Functional Description

The AAT3698-1/-2 is a high performance battery charger

IC which is designed to charge single-cell Lithium-Ion or

Polymer batteries with up to 1.6A of current from an

external power source. It is a stand-alone charging solu-

tion requiring minimum input components. The AAT3698-

1/-2 also includes a fast turn-off over-voltage protection

(OVP) circuit with +28V which consists of a low-resis-

tance MOSFET in series with the charge control circuit.

The AAT3698-1/-2 also features under-voltage lockout

protection, power OK, charge status monitoring, and a

5.0V LDO with 50mA output through the OVP switch.

Battery Charging Profile

Figure 1 illustrates the entire battery charging operation

profile, which consists of three (AAT3698-2) or four

(AAT3698-1) phases:

1. Preconditioning (Trickle) Charge

2. Constant Current Charge (CC)

3. Constant Voltage Charge (CV)

4. Automatic Recharge (AAT3698-1 only)

Preconditioning Charge

Battery charging commences only after the AAT3698-1/-

2 checks several conditions in order to maintain a safe

charging environment. The input supply must be above

the minimum operating voltage (VMIN) or under-voltage

lockout threshold (VUVLO) and the enable pin must be low

for the charging sequence to begin. When these condi-

tions have been met and a battery is connected to the

BAT pin, the AAT3698-1/-2 checks the state of the bat-

tery and determines which charging mode to apply. If

the battery voltage is below the preconditioning voltage

threshold (VMIN), then the AAT3698-1/-2 begins precon-

ditioning the cell (trickle charging) by charging at 10%

of the programmed constant current. For example, if the

programmed fast charge current is 1000mA, then the

preconditioning (trickle) charge current is 100mA.

Battery cell preconditioning is a safety precaution for

deeply discharged cells and will also reduce the power

dissipation in the internal series pass transistor when the

voltage across the device is at greatest potential.

Functional Block Diagram

Charge

Control

Current

Sense

BAT

GND

INCHR

TERM

OVP

Control

OVP

Switch

UVLO

OVP Flag

Reverse

Blocking

LDOOUT

POK

5V LDO

BATS

ABI

ABO

POK

200kΩ

BAT

ISET

NOBAT

1600kΩ

STAT

BAT

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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Constant Current Fast Charge

Battery cell preconditioning charge continues until the

battery voltage reaches the preconditioning voltage

threshold (VMIN). At this point, the AAT3698-1/-2 begins

the constant current charge phase. The current level for

this mode is programmed using a single resistor from the

ISET pin to ground. The programmed current can be set

from a minimum of 100mA up to a maximum of 1.6A.

Constant Voltage Charge

Constant current charging will continue until the battery

voltage reaches the constant output voltage, VCO. The

AAT3698-1/AAT3698-2 then transitions to constant volt-

age mode, in which the charge IC regulates the battery

voltage to a constant output voltage (factory programmed

to 4.2V). The charging current decreases during this

phase. The charger regulates battery voltage at 4.2V and

continues to charge the battery until the charge current

reaches the termination level set by RTERM. When the

charge current reaches its termination level ITERM, charg-

ing is terminated.

AAT3698-1

The charger turns off the series pass device even if the

EN pin is held low and the device automatically enters a

power-saving sleep state. During this time, the series

pass device blocks current in both directions, preventing

the battery from discharging through the IC. The device

remains in sleep mode even if the charger source is dis-

connected. When the battery terminal voltage drops

below the VRCH threshold, the AAT3698-1 resumes charg-

ing operation if no fault is detected.

AAT3698-2

The charger regulates the battery voltage at 4.2V and

continues to charge the battery with a current lower

than the charge termination current until a logic high is

applied to the EN pin to stop charging.

Battery

Voltage

Battery

Current

Preconditioning Charge Constant Current Charge Constant Voltage Charge

ICH _CC

VCO(REG)

ICH _TRK

VMIN

ICH _TERM

STAT

Turns

OFF

Charger Turns OFF when

EN = high (AAT3698-2)

STAT

Charger Turns OFF when

ICH_CC = ICH_TERM (AAT3698-1)

Figure 1: AAT3698-1/-2 Battery Charging Profile.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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Power Fail

STAT = POK = high

POK = high

Pre-Charge

STAT = POK = low

EN = low & VIN ≥ VBAT ≤ VBOVP

Fast Charge

VBAT < VMIN

Voltage Mode

Charge

Any States

Charger Off

STAT = high,

POK = low

STAT = POK = low STAT = POK = low

EN = high or VIN ≤ VBAT or VBOVP ≤ VBAT

Charge Complete

TLOOP TLOOP

VBAT ≥ VMIN

VBAT < VRCH

(AAT3698-1 only) IBAT = ITERM

VBAT ≥ VCO(REG)

STAT = high, POK = low

Charge Off for AAT3698-1

Charge On for AAT3698-2

POK = low

Figure 2: Charger Operational State Diagram.

Charge Status Output

The AAT3698-1/-2 provides battery charging status via

the charge status indication pin (STAT). This pin is inter-

nally connected to an N-channel open-drain MOSFET,

which can be used as a logic signal or to drive an exter-

nal LED. The STAT pin pulls high to indicate charge

completion. The charge completion occurs only when the

EN pin is pulled high or the charge current reaches its

charge termination current level. The status pin indicates

the conditions as described in Table 1.

Charge Status STAT

VIN > VUVLO High

VIN > VOVP High

The charge current is below its termination level High

EN pin is pulled high High

Battery is charging and the charge current is above

its termination level. Low

Table 1: LED Status Indicator.

Enable / Disable

The AAT3698-1/-2 provides an enable function to turn the

charger IC on and off. The enable (EN) pin is internally

pulled down with 200k. When EN is pulled down or left

floating, the device begins normal operation. When EN is

pulled to a logic high level, the AAT3698-1/-2's charging

circuit will be shut down and forced into sleep state. The

over-voltage protection/LDO circuit remains active even

in sleep state. In sleep state, charging is halted regardless

of the battery voltage or charging state. When the device

is re-enabled, the charge control circuit automatically

resets and resumes charging functions with the appropri-

ate charging mode based on the battery charge state and

measured cell voltage at the BAT pin.

Under-Voltage Lockout (UVLO)

The AAT3698-1/-2 has a typical under-voltage lockout

threshold of 3V. When the input voltage is less than the

UVLO level, OVP and the charger are turned off. The

UVLO is designed with 150mV hysteresis to ensure circuit

stability.

Over-Voltage Protection

In normal operation, the OVP protection device acts as a

load switch, connecting the power source from IN to

INCHR. This switch is designed with very low resistance

to minimize the voltage drop between the power source

and the charger and to reduce the power dissipation.

When the voltage on the power source exceeds the OVP

trip point, VOVP

, the switch immediately turns off and dis-

connects the load and the charger from the power source

and preventing damage to any downstream components.

Simultaneously, the fault flag is raised, alerting the sys-

tem. If an over-voltage condition is applied at the time of

the device enable, the switch remains open (OFF).

Power OK Output Flag

The Power OK flag (POK) is an active-low open-drain

power good reporting output. A pull-up resistor should

be connected from POK to another system power volt-

age. In the event of an under-voltage or over-voltage

condition, POK will be de-asserted. After the over-volt-

age fault is released, POK will be asserted. POK will be

also de-asserted when VIN is lower than VBAT when

EN is low. When EN is high, POK is asserted only after

UVLO and OVP conditions.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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Power Status POK

VIN < VUVLO High

VIN > VOVP High

VIN < VBAT + VIN_BAT_OS, EN = low High

VUVLO  VBAT + VIN_BAT_OS  VIN  VOVP Low

Table 2: POK Flag Indicator.

Automatic Booting

An auxiliary OR gate provides a booting enable signal

from two inputs, an internal power OK signal and an

external ABI signal. The ABO states are listed in Table 3.

VBAT POK ABI ABO

Yes Low X High

Yes High High High

Yes High Low Low

No X X Low

Table 3: Automatic Booting.

Battery Detection

When the NOBAT pin is set to logic high level, the char-

ger is disabled. When it is set to logic low level, the

charger is enabled. This pin is internally pulled to the

LDOOUT pin through a 1.6M resistor.

Battery Over-Voltage Protection

An over-voltage event is defined as a condition where

the voltage at the BAT pin exceeds the maximum battery

charge voltage and is set by the battery over-voltage

protection threshold (VBOVP). If an over-voltage condition

is sensed by the BATS pin, the AAT3698-1/-2 charge

control shuts down the device until the voltage at the

BAT pin drops below VBOVP

. The AAT3698-1/-2 resumes

normal charging operation after the over-voltage condi-

tion is removed.

Digital Thermal Loop Control

The AAT3698-1/-2 includes a thermal management sys-

tem. The system is activated when the die temperature

reaches its preset internal temperature threshold (110°C)

and maintains the die temperature by reducing the con-

stant charge current.

Over-Temperature Shutdown

The AAT3698-1/-2 has a thermal protection control cir-

cuit which shuts down charging functions if the internal

die temperature exceeds the preset thermal limit thresh-

old (140°C). Once the internal die temperature falls

below the thermal limit, normal operation resumes in the

previous charging state.

Linear Dropout Regulator

The AAT3698-1/-2's linear dropout regulator output

(LDOOUT) provides 5V output with 30mA typical load

current capabilities.

IC Input

The AAT3698-1/-2 has an IC input pin that is internally

connected to ground through a 100k resistor. Float or

ground this pin for normal operation.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

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Application Information

Constant Charge Current

The constant current charge level is user programmed

with a set resistor connected between the ISET pin and

ground. The tolerance of the set resistor determines the

accuracy of the constant charge current as well as the

preconditioning trickle charge current. For this reason, a

1% tolerance metal film resistor is recommended for the

set resistor function. The constant charge current level

from 100mA to 1.6A is set by selecting the appropriate

resistor value from Table 4.

The approximate charge current (ICH_CC_typ) can be found

using the following formula:

ISET

CH_CC_TYP

=· K

ISET

= V

ISET

· GM

OUT

Where:

CH_CC_TYP

ISET

SET

OUT

= = 250ms=

When RSET = 3.16k and KISET = 790.

Typical Constant Charge

Current (mA)

Set Resistor Value

(kΩ)

50 31.6

100 15.8

200 7.87

400 3.92

500 3.16

600 2.67

800 1.96

1000 1.58

1580 1.00

Table 4: RSET Values

Figure 3 shows the relationship of constant charging cur-

rent and set resistor values for the AAT3698-1/-2.

RSET (KΩ

)

Constant Charging Current (mA)

100

1000

10000

1100.1 100

Figure 3: Constant Charging Current vs.

Set Resistor Values.

Charge Termination Current

The charge termination current level is programmed by

an external resistor (RTERM) connected between the TERM

pin and ground. Use the resistor values listed in Table 5

to set the desired charge termination current.

RTERM (KΩ)I

CH_TERM (%)

6.65 5%

13.3 10%

26.7 20%

40.2 30%

53.6 40%

Table 5: Charge Termination Current

Programming Resistor Values.

RTERM (kΩ

)

ICH_TERM (%)

10%

20%

30%

40%

50%

10 20030405060

Figure 4: Charge Termination Current vs. RTERM.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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Use the following formula to set the charge termination

current, ICH_TERM.

15µA · R

TERM

CH_TERM

=· I

CH_CC

ICH_TERM is set by default to 10% of ICH_CC when the TERM

pin is connected to the INCHR pin.

When the charge current reaches the termination current,

the STAT pin will be set to high impedance, but the charge

termination current will continue to flow until the EN pin

is toggled high. To set charge termination current thresh-

old to the lowest level, connect the TERM pin to ground.

Battery Connection

A single cell Li-Ion/Polymer battery should be connected

between the BAT pin and ground.

Status Indicator Display

Simple system charging status can be displayed using a

single LED in conjunction with the AAT3698-1/-2's STAT

pin. This pin has a simple switch connecting the LED’s

cathode to ground. Refer to Table 1 for LED display

definitions. The LED anodes should be connected to

INCHR or other system power supply that does not

exceed 7V, depending upon system design require-

ments. The LED should be biased with as little current as

necessary to create reasonable illumination; therefore, a

ballast resistor should be placed between the LED cath-

ode and the STAT pin. LED current consumption will add

to the overall thermal power budget for the device pack-

age, so it is wise to keep the LED drive current to a

minimum. 2mA should be sufficient to drive most low-

cost green or red LEDs. Driving an individual status LED

with over 8mA is not recommended.

The required ballast resistor value can be estimated

using the following formulas:

When connecting to the adapter supply with a red LED:

ADP

- V

F(LED)

LED(STAT)

B(STAT)

Example:

5.5V - 2.0V

2mA

B(STAT)

= = 1.75kΩ

Note: Red LED forward voltage (VF) is typically 2.0V @

2mA.

When connecting to the USB supply with a green LED:

USB

- V

F(LED)

LED(STAT)

B(STAT)

Example:

5.0V - 3.2V

2mA

B(STAT)

= = 900Ω

Note: Green LED forward voltage (VF) is typically 3.2V @

2mA.

Capacitor Selection

Input Capacitor (IN)

A 1F or larger capacitor is typically recommended for

CIN. CIN should be located as close to the device IN 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 opera-

tion, 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.

Typically, 50V rated capacitors are required for the appli-

cation to prevent any surge voltage. Ceramic capacitors

selected as small as 1206 are available which can meet

these requirements. Capacitors with other voltage rating

can also be used for known input voltage applications.

Charger Input Capacitor (INCHR)

A 1F decoupling capacitor is recommended to be placed

between INCHR and GND. This capacitor should be locat-

ed as closely and routed as directly as practically possible

to the device's INCHR pin with a good ground return path

for maximum device over-voltage protection perfor-

mance.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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Charger Output Capacitor (BAT)

The AAT3698-1/-2 only requires a 1F ceramic capacitor

on the BAT pin to maintain circuit stability. This value

should be increased to 10F or more if the battery con-

nection is made at any distance from the charger output.

If the AAT3698-1/-2 is used in applications where the

battery can be removed from the charger, such as desk-

top charging cradles, an output capacitor greater than

10F may be required to prevent the device from cycling

on and off when no battery is present.

Linear Regulator Output Capacitor (LDOOUT)

For proper load voltage regulation and operational stabil-

ity, a capacitor is required between LDOOUT and GND.

The output capacitor connection to the LDO regulator

ground pin should be made as directly as practically pos-

sible for maximum device performance. Since the regu-

lator has been designed to function with very low ESR

capacitors, multilayer ceramic capacitors in the 1.0F to

10F range are recommended for best performance.

Applications utilizing the exceptionally low output noise

and optimum power supply ripple rejection of the

AAT3698-1/-2 should use a value of 2.2F or greater for

the LDO’s output capacitor.

Printed Circuit Board

Layout Recommendations

For proper thermal management and to take advantage

of the low RDS(ON) of the AAT3698-1/-2, a few circuit

board layout rules should be followed: IN and BAT should

be routed using wider than normal traces, and GND

should be connected to a ground plane. To maximize

package thermal dissipation and power handling capac-

ity of the AAT3698-1/-2 TDFN33-14 package, solder the

exposed paddle of the IC to the thermal landing of the

PCB, where the thermal landing is connected to the

ground plane. If heat is still an issue, multi-layer boards

with dedicated ground planes are recommended. Also,

adding more thermal via holes on the thermal landing

would help transfer heat to the PCB effectively.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

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Figure 5: AAT3698-1/-2 Evaluation Board Figure 6: AAT3698-1/-2 Evaluation Board

Top Side Layout. Mid1 Layer Layout.

Figure 7: AAT3698-1/-2 Evaluation Board Figure 8: AAT3698-1/-2 Evaluation Board

Mid2 Layer Layout. Bottom Side Layout.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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

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1µF

JP1

VIN

GND

C1 1206 X7R 1µF 50V GRM31MR71H105KA88

C2, C3, C4 0603 X5R 1µF 10V GRM188R61A105KE34

BATGND

Green LED

Red LED

+5 R1

13.3k

3.16k

1µF

LDOOUT

TP3

INCHR

TP1

1µF

TP2

BAT

INCHR

LDOOUT 3

POK

STAT

ABI 13

TERM 7

GND

NOBAT 12

ISET 10

IC 11

ABO 6

BAT 14

AAT3698-TDFN33-14

AAT3698-X

NOBAT

JP2

R5 (optional)

ABI

TP4

ABO

TP5

5V TP6

R6 (optional)

Figure 7: AAT3698-1/-2 Evaluation Board Schematic.

Component Part Number Description Manufacturer

U1 AAT3698IWO-1/-2 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-14 Package Skyworks

C1 GRM31MR71H105KA88 Ceramic 1F/50V, 10%, X7R, 1206 Murata

C2, C3, C4 GRM188R61A105KE34 Ceramic 1F/10V, 10%, X5R, 0603 Murata

R1, R2 Chip Resistor 1.5k, 5%, 1/4W, 0603 Vishay

R3 Chip Resistor 13.3k, 1%, 1/4W, 0603 Vishay

R4 Chip Resistor 1.58k, 1%, 1/4W, 0603 Vishay

R5 Chip Resistor 10k, 1%, 1/4W, 0603 Vishay

R6 Chip Resistor 0, 5%, 1/4W, 0603 Vishay

D1 LST-C190CKT Red LED, 0603 Lite-On Inc.

D2 LST-C190GKT Green LED, 0603 Lite-On Inc.

JP1, JP2 PRPN401PAEN Conn. Header, 2mm zip Sullins Electronics

Table 6: AAT3698-1/-2 Evaluation Board Bill of Materials (BOM).

Product

Constant Regulated

Output Voltage (V)

Automatic Charge Termination

and Recharge Sequencing

when IBAT ≤ ITERM

Input OVP

Trip Point (V)

Preconditioning

Voltage Threshold (V)

AAT3698-1 4.2 Yes 7.25 2.6

AAT3698-2 4.2 No 7.25 2.6

Table 7: AAT3698 Options.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

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, 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.

Ordering Information

Product Package Marking1Part Number (Tape and Reel)2

AAT3698-1 TDFN33-14 A5XYY AAT3698IWO-4.2-1-T1

AAT3698-2 TDFN33-14 D6XYY AAT3698IWO-4.2-2-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

TDFN33-14

Top View Bottom View

3.000 ±

0.050

Index Area

3.000 ±

0.050

Detail "A"

1.650 ±

0.050

2.500 ±

0.050

0.203 REF

0.750 ±

0.050

0.000

0.100

- 0.000

Detail "A"

Side View

0.425 ±

0.050

0.400 BSC

0.180 ±

0.050

Pin 1 Indicator

(Optional)

All dimensions in millimeters.

AAT3698

DATA SHEET

1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

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201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

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

PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES

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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

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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

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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

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