AAT3158ITP-T1 - Skyworks Solutions, Inc.

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012 1

Typical Application

2.7V to 5.5V

EN/SET

VIN

EN/SET

C2+

C2-

C1+

C1-

VOUT

GND

AAT3158

CIN

1µF

COUT

1µF

D1 D2 D3 D4

General Description

The AAT3158 is a low noise, constant frequency charge

pump DC/DC converter that uses a tri-mode load switch

(1X), fractional (1.5X), and doubling (2X) conversion to

maximize efficiency for white LED applications. The

AAT3158 is capable of driving up to four LED channels at

20mA per channel from a 2.7V to 5.5V input. The current

sinks may be operated individually or in parallel for driv-

ing higher current LEDs. A low external parts count (two

1µF flying capacitors and two small 1µF capacitors at VIN

and VOUT) make this part ideally suited for small, battery-

powered applications.

Skyworks' S2Cwire™ (Simple Serial Control) serial digital

input is used to enable, disable, and set current for each

LED with 16 settings down to 50µA. The low current

mode supply current can be as low as 50µA to save

power.

Each output of the AAT3158 is equipped with built-in

protection for VOUT short circuit and auto disable for load

short-circuit conditions. Built-in soft-start circuitry pre-

vents excessive inrush current during start-up. A low

current shutdown feature disconnects the load from VIN

and reduces quiescent current to less than 1µA.

The AAT3158 is available in a Pb-free, space-saving

2.85x3.0mm TSOPJW-12 package.

Features

• VIN Range: 2.7V to 5.5V

• Fully Programmable Current with Single Wire

▪ 16 Current Levels

▪ Four Low Current Settings Down to 50µA

• Low IQ (50µA) for Low Current Mode

• Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum

Efficiency and VF Coverage

• Drives Up to Four LED Channels

• No Inductors, Low Noise Operation

• 1MHz Constant Switching Frequency

• Small Application Circuit

• Built-In Thermal Protection

• Automatic Soft-Start

• IQ <1µA in Shutdown

• 2.85x3mm TSOPJW-12 Package

Applications

• Color (RGB) Lighting

• Programmable Current Sinks

• White LED Backlighting

• White Photo Flash for Digital Still Cameras

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012

Pin Descriptions

Pin # Symbol Function

1 D4 Current sink input #4.

2 EN/SET S2Cwire serial interface control pin.

3 C1+ Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.

4 C1- Flying capacitor 1 negative terminal.

5 VOUT Charge pump output to drive load circuit. Requires 1µF capacitor connected between this pin and ground.

6 C2+ Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.

7 C2- Flying capacitor 2 negative terminal.

8 VIN Input power supply. Requires 1µF capacitor connected between this pin and ground.

9 GND Ground.

10 D3 Current sink input #3.

11 D2 Current sink input #2.

12 D1 Current sink input #1.

Pin Configuration

TSOPJW-12

(Top View)

EN/SET

C1+

C1-

VOUT

C2+

GND

VIN

C2-

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 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.

4. Derate 6.25mW/°C above 25°C.

Absolute Maximum Ratings1

Symbol Description Value Units

VIN Input Voltage -0.3 to 6 V

VEN/SET EN/SET to GND Voltage -0.3 to VIN + 0.3 V

IOUT2Maximum DC Output Current 150 mA

TJOperating Junction Temperature Range -40 to 150 °C

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

Thermal Information3

Symbol Description Value Units

PDMaximum Power Dissipation40.625 W

qJA Maximum Thermal Resistance 160 °C/W

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012

1. The AAT3158 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-

tion with statistical process controls.

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

Electrical Characteristics1

CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C, VIN = 3.6V.

Symbol Description Conditions Min Typ Max Units

Input Power Supply

VIN Operation Range 2.7 5.5 V

ICC Operating Current

1X Mode, 3.0 ≤ VIN ≤ 5.5, Active, No Load Current 0.3 1

1.5X Mode, 3.0 ≤ VIN ≤ 5.5, Active, No Load Current 1 3

2X Mode, 3.0 ≤ VIN ≤ 5.5, Active, No Load Current 1

50µA Setting, 1X Mode 50 µA

ISHDN Shutdown Current EN/SET = 0 1 µA

IDX ISINK Average Current Accuracy 18 20 22 mA

I(D-Match) Current Matching2VF:D1:D4 = 3.6V 0.5 1 %

VTH

1X to 1.5X or 1.5X to 2X Transi-

tion Threshold at Any ISINK Pin 150 mV

Charge Pump Section

TSS Soft-Start Time 100 µs

FCLK Clock Frequency 1000 kHz

EN/SET

VEN(L) Enable Threshold Low VIN = 2.7V 0.4 V

VEN(H) Enable Threshold High VIN = 5.5V 1.4 V

TEN/SET LO EN/SET Low Time 0.3 75 µs

TEN/SET HI MIN Minimum EN/SET High Time 50 ns

TEN/SET HI MAX Maximum EN/SET High Time 75 µs

TOFF EN/SET Off Timeout 500 µs

TLAT EN/SET Latch Timeout 500 µs

IEN/SET EN/SET Input Leakage -1 1 µA

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012

Typical Characteristics

Efficiency vs. Supply Voltage

Supply Voltage (V)

Efficiency (%)

100

2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5

6mA/ch

VF = 3V

500µA/ch

VF = 2.7V

20mA/ch

VF = 3.4V

Turn-On to 1X Mode

(VIN = 4.2V; 20mA/ch Load)

Time (100µs/div)

EN/SET

(2V/div)

VOUT

(2V/div)

IIN

(100mA/div)

VSINK

(1V/div)

Turn-On to 1.5X Mode

(VIN = 3.5V; 20mA/ch Load)

Time (100µs/div)

EN/SET

(2V/div)

VOUT

(2V/div)

IIN

(200mA/div)

VSINK

(1V/div)

Turn-On to 2X Mode

(VIN = 2.8V; 20mA/ch Load)

Time (100µs/div)

EN/SET

(2V/div)

VOUT

(2V/div)

IIN

(500mA/div)

VSINK

(500mV/div)

Turn-Off from 1.5X Mode

(VIN = 3.5V; 20mA/ch Load)

Time (100µs/div)

EN/SET

(2V/div)

(1V/div)

IIN

(100mA/div)

Diode Current vs. Temperature

(20mA/channel)

Temperature (°C)

Diode Current (mA)

18.0

18.5

19.0

19.5

20.0

20.5

21.0

21.5

22.0

-40 -25 -10 5203550658

ID1

ID4

ID2

ID3

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012

Typical Characteristics

Load Characteristics

(VIN = 3.7V; 1.5X Mode; 20mA/ch Load)

Time (500ns/div)

VIN

(20mV/div)

VSINK

(20mV/div)

VCP

(40mV/div)

Load Characteristics

(VIN = 3.5V; 1.5X Mode; 14mA/ch Load)

Time (500ns/div)

VIN

(20mV/div)

VSINK

(20mV/div)

VCP

(40mV/div)

Load Characteristics

(VIN = 2.9V; 2X Mode; 20mA/ch Load)

Time (500ns/div)

VIN

(20mV/div)

VSINK

(40mV/div)

VCP

(40mV/div)

Load Characteristics

(VIN = 2.9V; 2X Mode; 14mA/ch Load)

Time (500ns/div)

VIN

(20mV/div)

VSINK

(40mV/div)

VCP

(40mV/div)

Input Ripple vs. Input Voltage

Input Voltage (V)

Input Ripple (mV)

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

2.5 3.0 3.5 4.0 4.5 5.0 5.5

20mA/ch

14mA/ch

10mA/ch

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012

Typical Characteristics

EN/SET Latch Timeout vs. Input Voltage

Input Voltage (V)

EN/SET Latch Timeout (µs)

100

150

200

250

300

350

2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5

-40°C

25°C85°C

EN/SET Off Timeout vs. Input Voltage

Input Voltage (V)

EN/SET Off Timeout (µs)

100

150

200

250

300

350

2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5

-40°C

25°C85°C

Enable Threshold High vs. Input Voltage

Input Voltage (V)

Enable Threshold High (V)

0.4

0.6

0.8

1.0

1.2

1.4

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

-40°C

25°C85°C

Enable Threshold Low vs. Input Voltage

Input Voltage (V)

Enable Threshold Low (V)

0.4

0.6

0.8

1.0

1.2

1.4

2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5

-40°C

25°C85°C

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012

Functional Description

The AAT3158 is a tri-mode load switch (1X) and high

efficiency (1.5X or 2X) charge pump device intended for

white LED backlight applications. To maximize power

conversion efficiency, an internal sensing circuit moni-

tors the voltage required on each constant current sink

input and sets the load switch and charge pump modes

based on the input battery voltage and the current sink

input voltage. As the battery discharges over time, the

AAT3158 charge pump is enabled when any of the four

current sink inputs nears dropout. The charge pump ini-

tially starts in 1.5X mode. If the charge pump output

droops enough for any current source output to become

close to dropout, the charge pump will automatically

transition to 2X mode. The AAT3158 requires only four

external components: two 1µF ceramic capacitors for the

charge pump flying capacitors (C1 and C2), one 1µF

ceramic input capacitor (CIN), and one 0.33µF to 1µF

ceramic charge pump output capacitor (COUT).

The four constant current sink inputs (D1 to D4) can

drive four individual LEDs with a maximum current of

20mA each. The unused sink inputs must be connected

to VOUT; otherwise, the part will operate only in 2X charge

pump mode. The S2Cwire serial interface enables the

AAT3158 and sets the current sink magnitudes.

Constant Current Output Level Settings

The constant current sink levels for D1 to D4 are set via

the serial interface according to a logarithmic scale for

the first 12 codes, and a separate low current scale for

the last 4 codes. For the first 12 codes, each code is

approximately 1.5dB lower than the previous code. In

this manner, LED brightness appears linear with each

increasing code count. Because the inputs D1 to D4 are

true independent constant current sinks, the voltage

observed on any single given input will be determined by

the actual forward voltage (VF) for the LED being driven.

Functional Block Diagram

1X, 1.5X, 2X

Charge Pump

D/A

6 x 16 bit

ROM

S2Cwire

Interface

Soft-Start

Control

1MHz

Oscillator

Voltage

Reference

VIN

EN/SET

D/A D4

GND

VOUT

C1+ C1- C2+ C2-

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012

S2Cwire Serial Interface Timing

EN/SET

2 n n <= 16

Data Reg

THI

TLO TLAT TOFF

Since the input current sinks of the AAT3158 are pro-

grammable, no PWM (pulse width modulation) or addi-

tional control circuitry is needed to control LED bright-

ness. This feature greatly reduces the burden on a

microcontroller or system IC to manage LED or display

brightness, allowing the user to “set it and forget it.”

With its high-speed serial interface (1MHz data rate),

the input sink current of the AAT3158 can be changed

successively to brighten or dim LEDs in smooth transi-

tions (e.g., to fade-out) or in abrupt steps, giving the

user complete programmability and real-time control of

LED brightness.

S2Cwire Serial Interface

The current level magnitude is controlled by Skyworks'

Simple Serial Control (S2Cwire) serial interface. The

interface records rising edges of the EN/SET pin and

decodes them into 16 different states. The 16 current

level settings available are indicated in Table 1.

Data

Output

(mA/Ch) Data

Output

(mA/Ch)

1 20 9 6

2 18 10 4

3 16 11 3

4 14 12 2

5 12.5 13 1

6 11 14 0.5

7 9.5 15 0.1

8 8 16 0.05

Table 1: Current Level Settings.

The S2Cwire serial interface has flexible timing. Data can

be clocked-in at speeds greater than 1MHz, or much

slower, such as 15kHz. After data is submitted, EN/SET

is held high to latch the data. Once EN/SET has been

held in the logic high state for time TLAT, the programmed

current becomes active and the internal data register is

reset to zero. For subsequent current level program-

ming, the number of rising edges corresponding to the

desired code must be entered on the EN/SET pin.

When EN/SET is held low for an amount of time greater

than TOFF

, the AAT3158 enters into shutdown mode and

draws less than 1µA from VIN. The internal data register

is reset to zero during shutdown.

Auto-Disable Feature

The AAT3158 is equipped with an auto-disable feature for

each LED channel. After the IC is enabled and started up,

a test current of 100µA (typical) is forced through each

sink channel. The channel will be disabled if the voltage

of that particular SINK pin does not drop to certain

threshold. This feature is very convenient for disabling an

unused channel or during an LED fail short event.

Thermal Protection

The AAT3158 has built-in thermal protection circuit that

will shut down the charge pump if the die temperature

rises above the thermal limit, as is the case during a

short circuit of the VOUT pin.

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012

Applications Information

LED Selection

Although AAT3158 is specifically intended for driving

white LEDs, the device can also be used to drive most

types of LEDs with forward voltage specifications ranging

from 2.0V to 4.7V. LED applications may include main

and sub-LCD display backlighting, camera photo-flash

applications, color (RGB) LEDs, infrared (IR) diodes for

remotes, and other loads benefiting from a controlled

output current generated from a varying input voltage.

Since the D1 to D4 input current sinks are matched with

negligible voltage dependence, the LED brightness will be

matched regardless of the specific LED forward voltage

(VF) levels. In some instances (e.g., in high-luminous-

output applications such as photo flash), it may be neces-

sary to drive high-VF type LEDs. The low dropout current

sinks in the AAT3158 make it capable of driving LEDs

with forward voltages as high as 4.7V at full current from

an input supply as low as 3.0V. Outputs can be paralleled

to drive high-current LEDs without complication.

Device Switching Noise Performance

The AAT3158 operates at a fixed frequency of approxi-

mately 1MHz to control noise and limit harmonics that

can interfere with the RF operation of cellular telephone

handsets or other communication devices. Back-injected

noise appearing on the input pin of the charge pump is

20mV peak-to-peak, typically ten times less than induc-

tor-based DC/DC boost converter white LED backlight

solutions. The AAT3158 soft-start feature prevents noise

transient effects associated with inrush currents during

start-up of the charge pump circuit.

Capacitor Selection

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 Equivalent Series

Resistance (ESR) ceramic capacitors are used; in gen-

eral, low ESR may be defined as less than 100mW. A

value of 1µF for all four capacitors is a good starting

point when choosing capacitors. If the LED current

sources are only programmed for light current levels,

then the capacitor size may be decreased.

Capacitor Characteristics

Ceramic composition capacitors are highly recommended

over all other types of capacitors for use with the

AAT3158. Ceramic capacitors offer many advantages

over their tantalum and aluminum electrolytic counter-

parts. A ceramic capacitor typically has very low ESR, is

lowest cost, has a smaller PCB footprint, and is non-

polarized. Low ESR ceramic capacitors help maximize

charge pump transient response. Since ceramic capaci-

tors are non-polarized, they are not prone to incorrect

connection damage.

Equivalent Series Resistance

ESR is an important characteristic to consider when

selecting a capacitor. ESR is a resistance internal to a

capacitor that is caused by the leads, internal connec-

tions, size or area, material composition, and ambient

temperature. Capacitor ESR is typically measured in mil-

liohms for ceramic capacitors and can range to more

than several ohms for tantalum or aluminum electrolytic

capacitors.

Ceramic Capacitor Materials

Ceramic capacitors less than 0.1µF are typically made

from NPO or C0G materials. NPO and C0G materials

typically have tight tolerance and are stable over tem-

perature. Larger capacitor values are typically composed

of X7R, X5R, Z5U, or Y5V dielectric materials. Large

ceramic capacitors, typically greater than 2.2µF, are

often available in low-cost Y5V and Z5U dielectrics, but

capacitors greater than 1µF are typically not required for

AAT3158 applications. Capacitor area is another con-

tributor to ESR. Capacitors that are physically large will

have a lower ESR when compared to an equivalent

material smaller capacitor. These larger devices can

improve circuit transient response when compared to an

equal value capacitor in a smaller package size.

AAT3158

DATA SHEET

AAT3158 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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

202153A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 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, speci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 conicts, incompatibilities, or other dif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.

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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-

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Ordering Information

Package Marking1Part Number (Tape and Reel)2

TSOPJW-12 RHXYY AAT3158ITP-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

TSOPJW-12

0.20 + 0.10

- 0.05

0.055 ± 0.045 0.45 ± 0.15

7° NOM

4° ± 4°

3.00 ± 0.10

2.40 ± 0.10

2.85 ± 0.20

0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC

0.15 ± 0.05

0.9625

0.0375

1.00 + 0.10

- 0.065

0.04 REF

0.010

2.75 ± 0.25

All dimensions in millimeters.

1. XYY = assembly and date code.

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