AAT2869IDT-T1 - Skyworks Solutions, Inc.

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

General Description

The AAT2869 is a low-noise, constant-frequency charge

pump DC/DC converter that uses a dual-mode load

switch (1x) and fractional (1.5x) conversion to maximize

efficiency for white LED applications. The AAT2869 is

capable of driving 4 white LEDs at a total of 124mA from

a 2.7V to 5.5V input. The current sinks may be operated

individually or in parallel for driving higher-current LEDs.

A low external parts count (two 1F flying capacitors and

two small 1F capacitors at IN and OUTCP) makes the

AAT2869 ideally suited for small battery-powered appli-

cations. The fade-in/fade-out feature makes backlight

turn-on/turn-off more visual comfortable. The AAT2869

also includes two 150mA low, drop-out linear regulators

as additional power supplies for display and related cam-

era power. The LDO voltage is also programmable.

Skyworks’ Advanced Simple Serial Control™ (AS2Cwire™)

serial digital input is used to enable, disable and set the

maximum LED current to one of 32 levels for the LEDs,

to enable/disable the LDOs, and to set the LDO's output.

The programmable LED current ranges from 31mA to

0.4mA.

Each output of the AAT2869 is equipped with built-in

protection for short-circuit and auto-disable for load

short-circuit conditions. The soft-start circuitry prevents

excessive inrush current at charge pump start-up and

mode transitions. The AAT2869 is available in the Pb-free,

space-saving TQFN3.0x2.2-18L package, and operates

over the -40°C to 85°C ambient temperature range.

Features

•2.7V to 5.5V Supply Voltage Range

•Charge Pump for LED Driver

 Dual Mode 1x/1.5x

 Drives up to 4 LEDs with up to 31mA each

 Linear LED Output Control Options

•Maximum LED Current Set by AS2Cwire Interface,

32 Steps

•Fade In and Fade Out

•0.9MHz Constant Frequency

•Automatic Soft-Start Limits Inrush Current

•Dual 150mA LDOs

 Five Voltages with 1.2V, 1.5V, 1.8V, 2.8V, and 3.0V,

Sixteen Combinations Set by AS2Cwire

 Enable Control Independently by AS2Cwire

 Integrated Discharge Resistor when Disabled

•< 1.0A in Shutdown

•Short Circuit Protection

•Small Application Circuit

•-40°C to 85°C Temperature Range

•RoHS Compliant, Halogen-Free TQFN3.0x2.2-18

Package

Applications

•Camera Phones

•Digital Still Cameras (DSCs)

•LED Photo Flash/Torch

•MP3 Players

•PDAs and Notebook PCs

•Smartphones

Typical Application

C1+

C1-

C2+

C2-

OUTCP

AGND

AAT2869

1μF

CIN

2.2μF

COUT

1μF

1μF CLDOB

2.2μF

CLDOA

2.2μF

WLEDs

FCAP

GND

LDOA

LDOB

INLDO D3D2D1

LDOA

LDOB

VIN

2.7~5.5V

EN/SET

AS2Cwire

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Pin Descriptions

Pin # Symbol Function Description

1 C1+ I Flying capacitor C1 positive terminal. Connect a 1F capacitor between C1+ and C1-.

2 LDOB O LDOB output. Four output voltages can be programmed by AS2Cwire: 1.2V, 1.5V, 1.8V, and 2.5V.

2.8V is the default output voltage.

3 LDOA O LDOA output. Four output voltages can be programmed by AS2Cwire: 1.5V, 1.8V, 2.5V, and 3.0V.

1.8V is the default output voltage.

4, 8 GND PG Ground connection.

5 AGND AG Analog ground connection.

6 INLDO P Input power supply pin to LDOs. Connect this pin to IN. A 1F capacitor is recommended for

bypass use from this pin to ground.

7 IN P Input power supply pin. Connect a 1F bypass capacitor from this pin to ground.

9 FCAP I Fade-in/fade-out ﬁ lter. Connect a 1F capacitor to enable fade-in time of 1s at 20mA LED current

each. If the fade-in/fade-out function is not used, leave this pin ﬂ oating.

10 D1 I LED driver current sink D1. Connect LED cathode to this pin. If not used, please tie to OUTCP.

11 D2 I LED driver current sink D2. Connect LED cathode to this pin. If not used, please tie to OUTCP.

12 D3 I LED driver current sink D3. Connect LED cathode to this pin. If not used, please tie to OUTCP.

13 D4 I LED driver current sink D4. Connect LED cathode to this pin. If not used, please tie to OUTCP.

14 EN/SET I

Charge pump enable/set. When in the low state, AAT2869 is powered down, and consumes less

than 1A. When EN/SET jumps from low to high, the charge pump is active and 20mA LED cur-

rent each are set. The two LDOs are still inactive until data 3 is written to address 4 through the

AS2Cwire interface. This pin should not be left ﬂ oating.

15 C2- I Flying capacitor C2 negative terminal. Connect a 1F capacitor between C1+ and C1-.

16 C2+ I Flying capacitor C2 positive terminal. Connect a 1F capacitor between C2+ and C2-.

17 OUTCP O Charge pump output. Connect a 1F bypass capacitor between this pin to ground.

18 C1- I Flying capacitor C1 negative terminal. Connect a 1F capacitor between C2+ and C2-.

EP Exposed pad. Connect to ground directly beneath the package.

Pin Configuration

TQFN3.0x2.2 -18

(Top View)

AGND

INLDO

GND

FCAP

C2-

C2+

EN/SET

OUTCP

C1-

C1+

LDOB

LDOA

GND

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 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. Based on long-term current density limitation.

3. Mounted on an FR4 board.

Absolute Maximum Ratings1

Symbol Description Value Units

VIN Input Voltage -0.3 to 6.0 V

VEN EN to GND Voltage -0.3 to 6.0 V

VEN(MAX) Maximum EN to Input Voltage or GND VIN + 0.3 V

IOUT Maximum DC Output Current (continuous)2470 mA

TJMaximum Junction Operating Temperature -40 to +150 OC

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

Thermal Information3

Symbol Description Value Units

JA Thermal Resistance from Junction to Ambient 65.83 OC/W

JC Thermal Resistance from Junction to Case 38.90 OC/W

PDMaximum Power Dissipation 1.5 W

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

1. The AAT2869 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assuredby design, characterization, and correlation

with statistical process controls.

2. Determined by the average of all active channels.

3. Current matching is defined as the deviation of any sink current from the average of all active channels.

4. The EN/SET pin must remain logic low (less than VIL) for the duration of longer than 500s to guarantee the off timeout.

5. The EN/SET pin must remain logic high (greater than VIH) for the duration of longer than 500s to guarantee the latch timeout.

6. VDO[A/B] is defined as VIN – LDO[A/B] when LDO[A/B] is 98% of nominal.

Electrical Characteristics1

VIN = 3.6V; CIN = 1F; COUT = 1F; CFLY = 1F; CFLT = 56nF; TA = -40°C to 85°C, unless otherwise noted. Typical values

are TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Input Power Supply

VIN Input Voltage Range 2.7 5.5 V

VOUT (max) Maximum Output Voltage 5.5 V

Icc Operating Current

1x Mode, No Load Current, CP enabled 0.5 1

1.5x Mode, ID1 = FS, excluding ID1, VD2 = VD3 =

VD4 = IN 24

ISHDN(MAX) Shutdown Current EN = 0 1.0 A

Charge Pump Section

IOUT(MAX) Maximum Output Current VF = 3.6V 124 mA

fosc Oscillator Frequency 0.9 MHz

tSS Charge Pump Setup Time 100 s

VIN_(TH) Charge Pump Mode Hysteresis 1.5x to 1x Transition; ID1 = ID2 = ID3 = ID4 = 31mA 300 mV

LED Current Sink Outputs

IDX ISINK Current Accuracy2Data 1, TA = 25OC -10 +10

Data 32 only ±15

IDX(MATCH)

Current Marching Between Any Two

Current Sinks3VF; D1:D4 = 3.6V -5 +5

VD_(TH) Charge Pump Mode Transition 1x to 1.5x Mode, ID1 = ID2 = ID3 = ID4 = 31mA 120 250 mV

AS2Cwire Control and EN/SET Control

VEN/SET (L) EN/SET 0.4 V

VEN/SET (H) EN/SET 1.4 V

ILEAK EN/SET Input Leakage -1 1 mA

tEN/SET(LOW) EN/SET Input Low Time 0.3 75 s

tEN/SET(HI_MIN) EN/SET Minimum High Time 50 ns

tEN/SET(HIMAX) EN/SET Maximum High Time 75 s

tEN/SET(OFF) EN/SET Input Off Timeout4 500 s

tEN/SET(LAT) EN/SET Latch Timeout5 500 s

Linear Regulators

VOUT[A/B]/

VOUT[A/B]

LDOA, LDOB Output Voltage

Tolerance

IOUT = 1mA to 150mA; TA = 25°C -2 2 %

IOUT = 1mA to 150mA; TA = -40°C to +85°C -3.0 3.0 %

IOUT[A/B](MAX) LDOA, LDOB Maximum Load Current 200 - mA

VOUT[A/B](DO) LDOA, LDOB6VOUT[A/B]  3.0V; IOUT = 150mA 100 150 mV

VOUT/

VOUT*VIN

Line Regulation VIN = (VOUT[A/B] + 1V) to 5V 0.09 %/V

PSRR[A/B]

LDOA, LDOB Power Supply Rejection

Ratio IOUT[A/B] =10mA, 1kHz 50 dB

ROUT_(DCHG)

LDOA, LDOB Auto-Discharge

Resistance 720 

Thermal

TSD TJ Thermal Shutdown Threshold 140 OC

THYS TJ Thermal Shutdown Hysteresis 20 OC

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Typical Characteristics

CP Operating Current vs. Input Voltage

(1x Mode)

Input Voltage (V)

IQ (mA)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

0.0

0.1

0.2

0.3

0.4

0.5

0.6

85°C

25°C

-40°C

CP Operating Current vs. Input Voltage

(1.5x Mode)

Input Voltage (V)

IQ (mA)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

85°C

25°C

-40°C

CP Input Current vs. Input Voltage

Input Voltage (V)

Input Current (A)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

120

160

200

VF = 3.3V, ILED = 31mA

VF = 3.2V, ILED = 20mA

VF = 3.1V, ILED = 10mA

VF = 2.9V, ILED = 5mA

Shutdown Current vs. Temperature

Temperature (°

ISD (µA)

-40 -15 10 35 60 85

0.00

0.02

0.04

0.06

0.08

0.10 VIN = 3.6V

VIN = 5.5V

LDO Operating Current vs. Input Voltage

(LDOA + LDOB)

Input Voltage (V)

IOP (mA)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

0.00

0.05

0.10

0.15

0.20

0.25

85°C

25°C

-40°C

LDO Operating Current vs. Input Voltage

(LDOA Only)

Input Voltage (V)

IOP (mA)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

0.00

0.05

0.10

0.15

0.20

0.25

85°C

25°C

-40°C

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Typical Characteristics

CP Efficiency vs. Input Voltage

Input Voltage (V)

Efficiency (%)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

100

VF = 3.3V, ILED = 31mA

VF = 3.2V, ILED = 20mA

VF = 3.1V, ILED = 10mA

VF = 2.9V, ILED = 5mA

Frequency vs. Temperature

Temperature (°

Frequency (KHz)

-40 -15 10 35 60 85

850

870

890

910

930

950

CP Current Matching vs. Temperature

(VIN = 3.6V; VF = 3.3V; 31mA/ch)

Temperature (°C)

Current (mA)

-40 -15 10 35 60 85

28.5

29.3

30.1

30.9

31.7

32.5

CP Current Matching vs. Temperature

(VIN = 3.6V; VF = 3.3V; 0.5mA/ch)

Temperature (°C)

Current (mA)

-40 -15 10 35 60 85

0.30

0.34

0.38

0.42

0.46

0.50

LDO Line Regulation vs. Input Voltage

(VOUT = 1.2V)

Input Voltage (V)

Output Error (%)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

-1.0

-0.6

-0.2

0.2

0.6

1.0

85°C

25°C

-40°C

LDO Load Regulation vs. Output Current

(VOUT = 1.2V)

Load Current (mA)

Output Error (%)

0.1 1 10 100 1000

-1.8

-1.2

-0.6

0.0

0.6

1.2

1.8

85°C

25°C

-40°C

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Typical Characteristics

EN Input High Threshold Voltage

vs. Input Voltage

Input Voltage (V)

VEN(H) (V)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

0.2

0.4

0.6

0.8

1.0

1.2

-40°C

25°C

85°C

EN Input Low Threshold Voltage

vs. Input Voltage

Input Voltage (V)

VEN(L) (V)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

0.2

0.4

0.6

0.8

1.0

1.2

-40°C

25°C

85°C

PWM Input High Threshold Voltage

vs. Input Voltage

Input Voltage (V)

VPWM(H) (V)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

0.2

0.4

0.6

0.8

1.0

1.2

-40°C

25°C

85°C

PWM Input Low Threshold Voltage

vs. Input Voltage

Input Voltage (V)

VPWM(L) (V)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

0.2

0.4

0.6

0.8

1.0

1.2

-40°C

25°C

85°C

EN/SET Input Latch Time vs. Input Voltage

Input Voltage (V)

tEN/SET(LAT) (µs)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

120

160

200

240

280

320

85°C

25°C

-40°C

EN/SET Input Off Time vs. Input Voltage

Input Voltage (V)

tEN/SET(OFF) (µs)

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

120

180

240

300

360

85°C

25°C

-40°C

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Typical Characteristics

CP Turn On

(VIN = 3.6V; CIN = COUT = 1µF; CF = 56nF; 20mA/ch)

Time (100µs/div)

(2V/div)

VOUT

(2V/div)

ILED

(20mA/div)

IIN

(200mA/div)

CP Turn Off

(VIN = 3.6V; CIN = COUT = 1µF; CF = 56nF; 31mA/ch)

Time (100µs/div)

(2V/div)

VOUT

(2V/div)

ILED

(20mA/div)

IIN

(100mA/div) 0

CP Current Transient

(VIN = 3.6V; 31mA to 0.5mA)

Time (40µs/div)

VEN

(2V/div)

VOUT

(5V/div)

IIN

(200mA/div)

ILED

(20mA/div)

CP Current Transient

(VIN = 3.6V; 0.5mA to 31mA)

Time (100µs/div)

VEN

(2V/div)

VOUT

(5V/div)

IIN

(200mA/div)

ILED

(20mA/div)

LDO Turn On

(VIN = 3.6V; CIN = 2.2µF; CLDOA = CLDOB = 2.2µF;

VLDOA = 2.8V; VLDOB = 1.2V)

Time (40µs/div)

(2V/div)

VLDOA

(2V/div)

VLDOB

(2V/div)

IIN

(1A/div) 0

LDO Turn On

(VIN = 3.6V; CIN = 2.2µF; CLDOA = CLDOB = 2.2µF;

VLDOA = 3.0V; VLDOB = 1.8V)

Time (40µs/div)

(2V/div)

VLDOA

(2V/div)

VLDOB

(2V/div)

IIN

(1A/div) 0

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Typical Characteristics

LDO Turn Off

(VIN = 3.6V; CIN = 2.2µF; CLDOA = CLDOB = 2.2µF;

VLDOA = 2.8V; VLDOB = 1.2V)

Time (1ms/div)

(2V/div)

VLDOA

(2V/div)

VLDOB

(2V/div)

LDO Turn Off

(VIN = 3.6V; CIN = 2.2µF; CLDOA = CLDOB = 2.2µF;

VLDOA = 3.0V; VLDOB = 1.8V)

Time (1ms/div)

(2V/div)

VLDOA

(2V/div)

VLDOB

(2V/div)

1.5x Mode Operating Characteristics

(VIN = 3.2V; CIN = COUT = 1µF; 31mA/ch)

Time (1µs/div)

VIN

(AC coupled)

(50mV/div)

VOUT

(AC coupled)

(50mV/div)

IIN

(200mA/div)

ILED

(20mA/div)

CP Mode Transient

(VIN = 3.6V to 4.2V; CIN = COUT = 1µF; 31mA/ch)

Time (100µs/div)

VIN

(2V/div)

VOUT

(2V/div)

ILED

(20mA/div)

3.6V

4.2V

LDO Load Transient

(VIN = 3.6V; VOUTB = 1.2V; CIN = COUTB = 2.2µF;

10mA to 150mA)

Time (40µs/div)

VOUT

(2V/div)

IOUTB

(50mA/div)

PSRR vs. Frequency

(VIN = 3.6V, VRIPPLE = 500mVPP, CIN = COUT = 2.2μF, IL = 10mA)

Frequency (KHz)

PSRR (dB)

0.1 1 10 100

100

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Typical Characteristics

Dropout Characteristics

(VOUTA = 2.8V)

Input Voltage (V)

Output Voltage (V)

2.7 2.8 2.9 3.0 3.1 3.2

2.4

2.6

2.8

3.0

3.2

3.4

IOUT = 0mA

IOUT = 10mA

IOUT = 50mA

IOUT = 100mA

IOUT = 150mA

IOUT = 200mA

Dropout Characteristics

(VOUTA = 3.0V)

Input Voltage (V)

Output Voltage (V)

2.7 2.8 2.9 3.0 3.1 3.2

2.4

2.6

2.8

3.0

3.2

3.4

3.6

IOUT = 0mA

IOUT = 10mA

IOUT = 50mA

IOUT = 100mA

IOUT = 150mA

IOUT = 200mA

Fade In From CP Disable To Enable

(VIN = 3.6V; CIN = CF = 1µF; 31mA/ch)

Time (400ms/div)

VOUT

(2V/div)

ILED

(20mA/div)

VIN

(2V/div)

Fade Out From CP Enable To Disable

(VIN = 3.6V; CIN = CF = 1µF; 31mA/ch)

Time (400ms/div)

VOUT

(2V/div)

ILED

(20mA/div)

VIN

(2V/div)

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Functional Block Diagram

Dual-mode

Charge Pump

1X/1.5X

C1+

OUTCP

AGND

EN/SET

C1-

C2+

C2-

32-step AS2Cwire

Backlight Control

and LDO Setting

Control

Logic

Fade Filter

FCAP

LDOA

LDOB

INLDO

GND

Functional Description

The AAT2869 is a high efficiency charge pump white LED

driver for portable applications. It can drive up to 4 white

LEDs. The two integrated LDOs can provide 1.2V, 1.5V,

1.8V, 2.8V and 3.0V output voltages in 16 combinations

with up to 150mA load capability.

The AAT2869's charge pump is a fractional charge pump

and can multiply the input voltage by 1 or 1.5 times. The

charge pump switches at a fixed frequency of 0.9MHz.

The internal mode-selection circuit automatically switch-

es the mode between 1x and 1.5x based on the input

voltage, white LED forward voltage VF

, and the pro-

grammed LED current. This mode switching maximizes

the efficiency throughout the entire LED load range.

When the input voltage is high enough, the charge pump

operates in 1x mode (no charge pump) to provide max-

imum efficiency. If the input voltage is too low to supply

the programmed LED current, typically when the battery

discharges and the voltage decays, the 1.5x charge

pump mode is automatically enabled. When the battery

is connected to a charger and the input voltage rises suf-

ficiently, the device will switch back to 1x mode.

Six registers are designed for charge pump enable/dis-

able control, LED current programming, fade-in, fade-

out enable/disable, two LDOs enable/disable control and

LDO output voltage combination setting through the

AS2Cwire interface. After writing address 3, the LED cur-

rent value is programmed by the EN/SET serial data

AS2Cwire interface. The AS2Cwire interface records rising

edges of the EN/SET pin and decodes them into 32 indi-

vidual current level settings from 0.4mA to 31mA. To get

a visual fade in and fade out effect, a small external

capacitor is used to set LED current rising exponentially

to the programmed value and decreasing exponentially

to the programmed floor LED current level.

The AAT2869 has five registers with up to four bits each

to control LED backlighting enable/disable, LED current,

enable/disable for the two LDOs, output voltages, etc. as

shown in Table 1. Each data register can be written with

1 to 16 EN/SET rising edges. Some bits are internally

reserved and should only be written with data 0, such as

address 0, bit D0, D1 and D3, etc. in order to avoid

unexpected results. Address 0 is the default address.If

EN/SET is pulled high after a low level lasting for at least

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

AS2Cwire Registers

Address

Function

Data

Number

EN/SET Rising

Edges D3 D2 D1 D0

EN/SET Rising

Edges

0 [Default] 17 Backlight Enable 0 BL_ENB FADE_EN FADE_IN 1 ~ 8

1 18 Backlight Floor Level 0 0 FLOOR[1] FLOOR[2] 1 ~ 4

2 19 Backlight MSB 0 0 0 BL[4] 1 or 2

3 20 Backlight LSBs BL[3] BL[2] BL[1] BL[0] 1 ~ 16

4 21 LDO Enable Control 0 0 LDOA_EN LDOB_EN 1 ~ 4

5 22 LDO Output Voltage LDO[3] LDO[2] LDO[1] LDO[0] 1 ~ 16

Table 1: AAT2869 AS2Cwire Registers.

500s tOFF time, data 0 is written to address 0 and LED

backlighting is enabled with default 20mA LED current

each.

Address 0 – Backlight Enable and Fade Enable

The BL_ENB bit of address register 0 is adopted to

enable or disable the white LED backlighting. 0 enables

backlighting; 1 disables backlighting. The FADE_EN and

FADE_IN bits are adopted to enable/disable the fade-in/

fade-out function. The other bits of the register should

be written with data 0.

For example, to enable a 20mA fade-in visual effect,

send 4 data EN/SET rising edges after an EN/SET low

lasting for tLAT or send 4 data EN/SET rising edges after

17 address EN/SET rising edges.

Address 1 – Backlight Fade Floor Settings

When the fade-out function is enabled, the LED current

decreases to the programmed floor level instead of

decreasing to zero. The other bits of the register should

be written with data 0.

Addresses 2 and 3 –

LED Current Level Settings

The LED current level is set via the AS2Cwire interface in

a linear scale by 32 codes where the LED current of each

higher code is higher than the lower one, as shown in

Table 4. In this manner, the LED current decreases lin-

early with each decreasing code.

Description BL_ENB FADE_EN FADE_IN EN/SET Rising Edges

Backlight on [default] 0 0 0 1

Backlight on 0 0 1 2

Backlight on, Fade enabled: fade out 0 1 0 3

Backlight on, Fade enabled: fade in 0 1 1 4

Backlight off 1 0/1 0/1 5 ~ 8

Table 2: AS2Cwire Register Address 0.

Description FLOOR[1] FLOOR[2]

Floor 0.5mA [default] 0 0

Floor 1.0mA 0 1

Floor 2.0mA 1 0

Floor 3.0mA 1 1

Table 3: AS2Cwire Register Address 1.

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

LED

Current

Codes

Address 2 Address 3 LED

Current

(mA)BL4 BL3 BL2 BL1 BL0

1 0 0 0 0 0 0.4

2 0 0 0 0 1 0.9

3 0 0 0 1 0 1.9

4 0 0 0 1 1 2.9

5 0 0 1 0 0 3.9

6 0 0 1 0 1 4.9

7 0 0 1 1 0 6.0

8 0 0 1 1 1 7.0

9 0 1 0 0 0 8.0

10 0 1 0 0 1 9.0

11 0 1 0 1 0 10.0

12 0 1 0 1 1 11.0

13 0 1 1 0 0 12.0

14 0 1 1 0 1 13.0

15 0 1 1 1 0 14.0

16 0 1 1 1 1 15.0

17 1 0 0 0 0 16.0

18 1 0 0 0 1 17.0

19 1 0 0 1 0 18.0

20 1 0 0 1 1 19.0

21 1 0 1 0 0 20.0

[default]

22 1 0 1 0 1 21.0

23 1 0 1 1 0 22.0

24 1 0 1 1 1 23.0

25 1 1 0 0 0 24.0

26 1 1 0 0 1 25.0

27 1 1 0 1 0 26.0

28 1 1 0 1 1 27.0

29 1 1 1 0 0 28.0

30 1 1 1 0 1 29.0

31 1 1 1 1 0 30.0

32 1 1 1 1 1 31.0

Table 4: AS2Cwire Register Addresses 2 and 31.

Address 4 – LDO Enable Control

The AAT2869 includes two low dropout (LDO) linear

regulators. These regulators are powered from the bat-

tery and produce a fixed output voltage which is set using

the AS2Cwire serial interface. AS2Cwire address register

4 turns the two LDOs on/off through the AS2Cwire serial

interface. An internal resistor is used to discharge the

LDO output voltage when the LDO is disabled.

Description

Data

LDOA_EN LDOB_EN

EN/SET

Rising Edges

LDOA Off,

LDOB Off

[Default]

00 1

LDOA Off,

LDOB On 01 2

LDOA On,

LDOB Off 10 3

LDOA On,

LDOB On 11 4

Table 5: AS2Cwire Register Address 4.

Address 5 - LDO Voltage Output Setting

output voltage levels. Sixteen combinations of the two

LDOs can be programmed by the 4 bits of the register.

LDOA can be set to one of four levels: 1.5V, 1.8V, 2.8V, or

3.0V. LDOB can be set to one of four levels: 1.2V, 1.5V,

1.8V, or 2.8V. The LDO regulators require only a small

2.2F ceramic output capacitor for stable operation. If

improved load transient response is required, larger-val-

ued capacitors can be used without stability degradation.

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

AS2Cwire EN/SET Interface

The AAT2869 is dynamically programmable using the

AS2Cwire single-wire interface. AS2Cwire records rising

edges detected at the EN/SET pin to address and load

the data registers. The timing diagram in Figure 1 shows

the typical transmission protocol.

The AAT2869 latches address or data after the EN/SET

input has been held high for time tLAT (500s) through the

AS2Cwire interface. Address and data are differentiated by

the number of EN/SET rising edges. An address has from

17 to 22 EN/SET rising edges; data has from 1 to 16 EN/

SET rising edges. A typical AS2Cwire interface write pro-

tocol is a burst of EN/SET rising edges identifying a par-

ticular address, followed by a pause with EN/SET held

high for the tLAT timeout period, then a burst of rising

edges signifying data, and another tLAT timeout after the

data has been sent. Once an address is set, multiple

writes to that address are allowed since the address is not

reset after each write. Address edges are needed when

changing the address, or writing to an address other than

the default after shutdown. Address 0 is the default

address after shutdown. If the part is enabled with only

one rising edge after shutdown, then Address 0 will be

programmed and LED backlight channels BL1-BL4 will be

enabled to the default setting of 20mA each.

When EN/SET is held low for a time longer than tOFF

(500s), the AAT2869 enters shutdown mode with the

charge pump and both LDOs all turning off and draws

less than 1A of current from IN. At shutdown, the data

and address registers are reset to 0.

Short Circuit and

Over-Temperature Protection

The AAT2869 integrates short circuit protection to limit

the input current in case of the charge pump output or

the two LDO outputs are shorted to ground by fault. The

backlight and the two LDOs will recover to normal oper-

ation once the fault is removed.

The AAT2869 also includes over-temperature protection

circuitry. When the junction temperature is too high, the

over-temperature protection circuitry is active and the IC

enters standby mode, turning off the LED current and

LDO outputs. When the fault is removed, the LED back-

lighting and the LDO outputs all recover.

Description

Data

LDO[3] LDO[2] LDO[1] LDO[0] EN/SET Rising Edges

LDOA = 3.0V, LDOB = 2.8V 0 0 0 0 1

LDOA = 3.0V, LDOB = 1.8V 0 0 0 1 2

LDOA = 3.0V, LDOB = 1.5V 0 0 1 0 3

LDOA = 3.0V, LDOB = 1.2V 0 0 1 1 4

LDOA = 2.8V, LDOB = 2.8V 0 1 0 0 5

LDOA = 2.8V, LDOB = 1.8V 0 1 0 1 6

LDOA = 2.8V, LDOB = 1.5V 0 1 1 0 7

LDOA = 2.8V, LDOB = 1.2V 0 1 1 1 8

LDOA = 1.8V, LDOB = 2.8V [default] 1 0 0 0 9

LDOA = 1.8V, LDOB = 1.8V 1 0 0 1 10

LDOA = 1.8V, LDOB = 1.5V 1 0 1 0 11

LDOA = 1.8V, LDOB = 1.2V 1 0 1 1 12

LDOA = 1.5V, LDOB = 2.8V 1 1 0 0 13

LDOA = 1.5V, LDOB = 1.8V 1 1 0 1 14

LDOA = 1.5V, LDOB = 1.5V 1 1 1 0 15

LDOA = 1.5V, LDOB = 1.2V 1 1 1 1 16

Table 6: AS2Cwire Register Address 5 LDOA and LDOB Output Voltage Settings.

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Application Information

LED Selection

The AAT2869 is designed to drive high intensity white

flash LEDs with forward voltages up to 4.4V. Though

AAT2869 switches the charge pump mode 1x and 1.5x

mode automatically to maintain the continuous LED cur-

rent accuracy, to obtain higher efficiency lower VF white

LEDs should be selected.

Maximum LED Current Setting

32 maximum LED current codes from 0.4mA to 31mA can

be set by two registers using addresses 2 and 3 through

the EN/SET AS2Cwire interface as shown in Figure 2. To

obtain linear LED current change, the AAT2869 will not

change the LED current when only address 2 is written.

The control circuit only loads data to the address 2 and

address 3 registers after address 3 is written to deter-

mine which LED current code is programmed. The

address 2 BL4 default value is 0 after one EN/SET rising

edge.

Codes 1 to 16 with LED current from 0.4mA to 15mA can

be set after sending 20 rising edges to address 3 and

sending data with 1 to 16 rising edges after tLAT

. Codes

17 to 32 with LED current from 16mA to 31mA can be

obtained after writing both address 2 and address 3.

This operation is performed using the following steps:

1. Select address 2 by sending 19 rising edges to EN/SET

and holding high for tLAT;

2. Send data 1 to set DL4 by sending 2 rising edges and

holding high for tLAT;

3. Select address 3 by sending 20 rising edges on EN/

SET and holding high for tLAT;

4. Send data 15 to enable LED current code 32 setting

by sending 16 rising edges on EN/SET and holding

high for tLAT

1 2 19 20

TLAT TLAT

TLO

THI

Address Data

Address

EN/SET

Data Reg

12 n≤16

Figure 1: AS2Cwire Timing Diagram.

LED Current Code

ILED (V)

1357911132 4 6 8 10 12 14 15 1716 18 19 2120 22 23 2524 26 27 28 29 3130 32

Figure 2: AAT2869 Total 32 LED Current Codes vs. LED Current.

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Fade In and Fade Out

AAT2869 adopts several linear current change segments

to approximate the exponential LED current change to

get a fashion fade-in visual effect. The fade-in time is

mainly determined by the external capacitor CF and the

charge current. The following formula can be used to

estimate how much capacitance is suitable for an expect-

ed fade-in time.

CF (μF) = tFADE-IN

48.7 · ILED

For example, for a 1 second fade-in time at 20mA LED

current each, a 1F CF capacitor can be used. Table 7

shows the fade-in time with CF of 560nF and 1F CF at

different LED current settings.

CF (μF) ILED (mA) tFADE-IN (s)

0.56 10 0.273

0.56 15 0.409

0.56 20 0.545

0.56 25 0.682

0.56 30 0.818

1 10 0.5

1 15 0.7

1 20 1.0

1 25 1.2

1 30 1.5

Table 7: Fade-in Time Examples

at Different CF and LED Current Settings.

Fade-out time is determined by the discharging time of

the CF through an internal 200k resistor R. For exam-

ple, 1F CF generates 800ms fade-out time; 560nF CF

generates 450ms fade-out time.

tFADE-OUT (s) = 4 · RCF = 0.8 · CF

Charge Pump Efficiency

1x Mode Efficiency

The AAT2869's 1x mode is operational at all times and

functions alone to enhance device power conversion effi-

ciency when VIN is higher than the voltage across the

load. When in 1x mode, voltage conversion efficiency is

defined as output power divided by input power.

η = POUT

The ideal efficiency () in 1X charge pump mode can be

expressed as:

η = POUT = VF · IOUT ≈ VF

PIN VIN · IIN VIN

-or-

η(%) = 100 VF

VIN

1.5x Charge Pump Mode Efficiency

The AAT2869 contains a fractional charge pump which

will boost the input supply voltage in the event where VIN

is less than the voltage required to supply the output.

The efficiency () can be simply defined as a linear volt-

age regulator with an effective output voltage that is

equal to one and one half times the input voltage.

Efficiency () for an ideal 1.5x charge pump can be cal-

culated by the following equation:

== ≈

VF · IOUT

VIN · IIN

1.5 · VIN

VF · IOUT

VIN · 1.5 · IOUT

η = POUT

-or-

η(%) = 100 VOUT

1.5 · VIN

Capacitor Selection

The AAT2869 requires seven capacitors in its typical

application: CIN, COUT

, C1, C2, CFLT and CLOA, CLOB. Among

them, CIN, C1, C2 and COUT are required for 1.5x mode

charge pump operation. 1F surface-mount multi-layer

ceramic capacitors with low (less than 100m) equiva-

lent series resistance (ESR) are recommended. Though

ESR of the capacitors will not affect the ability of the

capacitor to store energy, it has a large effect on perfor-

mance such as equivalent output resistance, efficiency,

and output voltage ripple of the charge pump. Tantalum

and aluminum electrolytic capacitors are not recom-

mended due to their high ESR. A value of 2.2F or above

is required for the LDOA and LDOB output capacitors for

proper load voltage regulation and stable operation.

Some recommended capacitors are listed in Table 6.

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

For most applications, ceramic capacitors with X5R tem-

perature characteristic are preferred for AAT2869 appli-

cation. These capacitors have good capacitor tolerance

over wide temperature (X5R: ±15% over -55°C to

+85°C). Capacitors with Y5V or Z5U temperature char-

acteristic are generally not recommended for AAT2869.

They have wide capacitance tolerance over special tem-

perature (Y5V: +22%, -82% over -30°C to +85°C, Z5U:

+22%, -56% over +10°C to +85°C).

Careful selection of the four external capacitors CIN, C1,

C2, COUT is important because they will affect turn on

time, output ripple and transient performance. Optimum

performance will be obtained when low ESR (<100m)

ceramic capacitors are used. In general, low ESR may be

defined as less than 100m. A capacitor value of 1uF for

all four capacitors is a good starting point when choosing

capacitors. If the LED current sinks are only programmed

for light current levels, then the capacitor size may be

decreased.

Additional Applications

The current sinks of the AAT2869 can be combined to

drive higher current levels through a single LED. As an

example, Figure 3 shows the AAT2869 driving a single

white LED with up to 124mA by connecting D1-D4

together to the LED cathode.

Printed Circuit Board

Layout Recommendations

When designing a PCB for the AAT2869, the key require-

ments are:

1. Place the flying capacitors C1 and C2 as close to the

chip as possible; otherwise 1.5x mode performance

will be compromised.

2. Place the input and output decoupling capacitors as

close to the chip as possible to reduce switching

noise and output ripple.

3. Connect the exposed pad to GND plane for optimal

power dissipation.

Manufacturer Part Number Value (μF) Voltage Temp. Co. ESR (mΩ) at 1MHz Case

Murata

GRM188R61C105KA93 1 16 X5R 18 0603

GRM185R60J105KE21 1 6.3 X5R 16 0603

GRM188R61A225KE34 2.2 10 X5R 12 0603

TDK C1608X5R1C105K 1 16 X5R 5.5 0603

C1608X5R0J225K 2.2 6.3 X5R 3.3 0603

Table 6: AAT2869 Recommended Capacitors.

C1+

C1-

C2+

C2-

OUTCP

AGND

AAT2869

1μF

CIN

2.2μF

COUT

1μF

1μF CLDOB

2.2μF

CLDOA

2.2μF

FCAP

GND

LDO

LDOB

INLDO D1

Up to

124mA

LDOA

LDOB

VIN

2.7~5.5V

EN/SET

AS2Cwire

Figure 3: Higher Current, Single LED Application.

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Schematic and Layout

AS2Cwire

Microcontroller

AAT2869

White LED

Driver

1μF

2.2μF

CIN

0.1uF

R10

V _MCU

SELECT

DETAIL

SEND

R11

R1 2

VDD

GP5

GP4

GP3

4GP2 5

GP1 6

GP0 7

VSS 8

PIC12F675U2

LED2

Red

1μF

DC+

DC-

1μF

COUT

D2 D3 D4

1μF

EN/SET

50k

AAT2869

C1+

GND

EN/SET

FCAP

LDOB 2

LDOA 3

D4 13

D3 12

D2 11

C1-

D1 10

OUTCP 17

C2- 15

C2+ 16

GND

INLDO

AGND

CLDOA

CLDOB

LDOA

LDOB

V_LDO

LED1

Green

VOUT

2.2μF

Figure 4: AAT2869 Evaluation Board Schematic.

Figure 5: AAT2869 Evaluation Board Figure 6: AAT2869 Evaluation Board

Top Side Layout. Bottom Side Layout.

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012

Component Part Number Description Manufacturer

U1 AAT2869IDT Fade-in/Fade-out 4 Channel 1X/1.5X Charge Pump for

White LEDs with Dual LDOs Skyworks

U2 PIC12F675 8-Pin Flash-Based 8-Bit CMOS Microcontroller Microchip

R1, R2, R3, R4 RC0603FR-070RL Res 0 1/10W 1% 0603 SMD

YageoR8 RC0603FR-0749K9L Res 49.9K 1/10W 1% 0603 SMD

R6, R9, R10, R11, R12 RC0603FR-071KL Res 1K 1/10W 1% 0603 SMD

C1, C2, COUT

, CFGRM188R71C105K Cap Ceramic 1F 0603 X7R 16V 10%

MurataCLA, CLB, CIN GRM188R61A225K Cap Ceramic 2.2F 0603 X5R 10V 10%

C3 GRM188R71C104K Cap Ceramic 0.1F 0603 X7R 16V 10%

D1, D2, D3, D4 RS-0805UW 20mA White LED 0805 Realstar

LED1 0805KGCT Green LED 0805 HB

LED2 0805KRCT Red LED 0805 HB

CYCLE, UP, DOWN 6*6*5 12V 50mA Pushbutton E-LT

Table 8: AAT2869IDT-DB1 Evaluation Board Bill of Materials.

AAT2869

DATA SHEET

Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs

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

202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 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

NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, IN-

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.

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

Package Marking1Part Number (Tape and Reel)2

TQFN3.0x2.2-18L F3XYY AAT2869IDT-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

TQFN3.0x2.2-183

2.20

0.05

3.00

0.05

Index Area

1.10

0.05

0.40 BSC 0.20

0.05

1.90

0.05

0.30

0.05

Top View Bottom View

Side View

0.05

0.203 REF

0.75

0.05

Pin 1 Indicator

(optional)

All dimensions in millimeters.