AAT3167IFO-T1 - AnalogicTech

AAT3167

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

PRODUCT DATASHEET

3167.2009.09.1.5 1

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General Description

The AAT3167 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

AAT3167 is capable of driving five LEDs for a total of

135mA 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 1μF flying

capacitors and two small 1μF capacitors at IN and

OUTCP) make this part ideally suited for small, battery-

powered applications.

AnalogicTech’s AS2Cwire™ (Advanced Simple Serial

Control™) serial digital input is used to enable, disable,

and set current for each LED with a 16-level logarithmic

scale plus four low-current settings down to 115μA. For

optimized efficiency, low-current settings require only

50μA of housekeeping current.

Each output of the AAT3167 is equipped with built-in

protection for output short circuit and auto-disable for

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

prevents excessive inrush current during start-up. A low-

current shutdown feature disconnects the load from the

input and reduces quiescent current to less than 1μA.

The AAT3167 is available in a Pb-free, space-saving,

thermally-enhanced, 14-pin 3x3mm STDFN or 16-pin

4x4mm QFN package and is rated over the -40°C to

+85°C temperature range.

Features

• V

IN Range: 2.7V to 5.5V

• Fully Programmable Current with Single Wire

▪ 16-Step Logarithmic Scale

▪ 14/18/27mA Max Current

▪ Four Low-Current Settings Down to 115μA

▪ Low IQ (50μA) for Single-Channel, Low-Current

Mode

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

Efficiency and VF Coverage

• Drives Up to Five LEDs

• Individual Main-Sub (4-1) Group Control

• No Inductors, Low Noise Operation

• 1MHz Constant Switching Frequency

• Small Application Circuit

• Built-In Thermal Protection

• Built-In Auto-Disable for Open Circuit

• Automatic Soft Start

• I

Q <1μA in Shutdown

• STDFN33-14 or QFN44-16 Package

Applications

• Color (RGB) Lighting

• Programmable Current Sink

• Transmissive LCD Display

• White LED Backlighting

• White Photo Flash for Digital Still Cameras

Typical Application

1μF

D1 D2 D3 D4 D5 COU

1μF

CIN

1μF

2.7V to 5.5V

EN/SET

C1+

C1-

C2+

C2-

OUTCP

GND

AAT3167

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

PRODUCT DATASHEET

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Pin Descriptions

Pin Number

Symbol Function

AAT3167ISN AAT3167IFO

1, 3 n/a N/C No connection.

2 3 EN/SET AS2Cwire serial interface control pin.

4 6 OUTCP Charge pump output to drive load circuit. Requires 1μF ceramic capacitor connected

between this pin and ground.

5 7 C2+ Flying capacitor 2 positive terminal. Connect a 1μF ceramic capacitor between C2+

and C2-.

6 4 C1+ Flying capacitor 1 positive terminal. Connect a 1μF ceramic capacitor between C1+

and C1-.

7 5 C1- Flying capacitor 1 negative terminal.

8 8 C2- Flying capacitor 2 negative terminal.

9, 11 9, 11 GND Ground.

10 10 IN Input power supply. Requires 1μF ceramic capacitor connected between this pin and

ground.

12 12 D1 Current sink input #1.

13 13 D2 Current sink input #2.

14 14 D3 Current sink input #3.

15 1 D4 Current sink input #4.

16 2 D5 Current sink input #5.

EP EP Exposed paddle (bottom); connect to ground as closely as possible to the package.

Pin Configuration

QFN44-16 STDFN33-14

(Top View) (Top View)

N/C

EN/SET

N/C

OUTCP

C2+

C1+

C1-

C2-

GND

EN/SET

C1+

C1-

OUTCP

C2+

GND

C2-

D5 2

AAT3167

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

PRODUCT DATASHEET

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1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions

specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.

2. Based on long-term current density limitation.

3. Mounted on a FR4 board.

4. Derate 20mW/°C above 25°C.

Absolute Maximum Ratings1

Symbol Description Value Units

VIN Input Voltage to GND -0.3 to 6 V

VEN/SET EN/SET Voltage to GND -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 Dissipation QFN44-164

2.0 W

STDFN33-144

θJA Maximum Thermal Resistance QFN44-16 50 °C/W

STDFN33-14

AAT3167

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

PRODUCT DATASHEET

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1. The AAT3167 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, High Current Mode 0.3

1.5X Mode, 3.0≤ VIN ≤ 5.5, Active,

No Load Current, High Current Mode 1

2X Mode, 3.0 ≤ VIN ≤ 5.5, Active,

No Load Current, High Current Mode 1

1X Mode, 3.0 ≤ VIN ≤ 5.5, D5 Active,

IDS = 100μA, Low Current Mode 50

ISHDN Shutdown Current VEN/SET = 0V 1 μA

IDX

High Current Accuracy ISET = 18mA, TA = 25°C -10 10 %

Low Current Accuracy ISET = 400μA, TA = 25°C 15 %

I(D-Match) Current Matching2VF:D1:D5 = 3.6V 0.5 1 %

VTH

1X to 1.5X or 1.5X to 2X Transition

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 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

AAT3167

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

PRODUCT DATASHEET

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Typical Characteristics

CIN = COUT = C1 = C2 = 1.0μF; TA = 25°C, VIN = 3.6V, unless otherwise noted.

Efficiency vs. Supply Voltage

Supply Voltage (V)

Efficiency (%)

100

2.5 2.8 3.0 3.3 3.5 3.8 4.0 4.3 4.5 4.8 5.0 5.3 5.5

18mA

VF = 3.4V

5.1mA

VF = 3.0V

350µA

VF = 2.7V

Turn-On to 1X Mode

(VIN = 4.2V; 18mA Load)

Time (100µs/div)

(2V/div)

OUT

(2V/div)

IIN

(200mA/div)

VSINK

(500mV/div)

Turn-On to 1.5X Mode

(VIN = 3.5V; 18mA Load)

Time (100µs/div)

(2V/div)

OUT

(2V/div)

IIN

(200mA/div)

VSINK

(500mV/div)

Turn-On to 2X Mode

(VIN = 2.8V; 18mA Load)

Time (100µs/div)

(2V/div)

OUT

(2V/div)

IIN

(200mA/div)

VSINK

(500mV/div)

Turn-Off from 1.5X Mode

(VIN = 3.5V; 18mA Load)

Time (100µs/div)

(2V/div)

IIN

(100mA/div)

(1V/div)

Current Matching vs. Temperature

Temperature (°

Current (mA)

17.0

17.2

17.4

17.6

17.8

18.0

18.2

18.4

18.6

18.8

19.0

-40 -20 0 20 40 60 80

Channel 1

Channel 4

Channel 2 Channel 3

Channel 5

AAT3167

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

PRODUCT DATASHEET

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Typical Characteristics

CIN = COUT = C1 = C2 = 1.0μF; TA = 25°C, VIN = 3.6V, unless otherwise noted.

Load Characteristics

(VIN = 3.9V; 1.5X Mode; 18mA Load)

Time (500ns/div)

(40mV/div)

VSINK

(40mV/div)

VIN

(40mV/div)

Load Characteristics

(VIN = 2.9V; 2X Mode; 18mA Load)

Time (500ns/div)

(40mV/div)

VSINK

(40mV/div)

VIN

(40mV/div)

Load Characteristics

(VIN = 4.2V; 1.5X Mode; 27mA Load)

Time (500ns/div)

(40mV/div)

VSINK

(40mV/div)

VIN

(40mV/div)

Load Characteristics

(VIN = 3.3V; 2X Mode; 27mA Load)

Time (500ns/div)

(40mV/div)

VSINK

(40mV/div)

VIN

(40mV/div)

Input Ripple vs. Input Voltage

Input Voltage (V)

Input Ripple (mV)

2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5

27mA

18mA

14mA

AAT3167

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

PRODUCT DATASHEET

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Typical Characteristics

CIN = COUT = C1 = C2 = 1.0μF; TA = 25°C, VIN = 3.6V, unless otherwise noted.

TLAT vs. VIN

VIN (V)

TLAT (µ

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°C 85°C

TOFF vs. VIN

VIN (V)

TOFF (µ

100

150

200

250

300

350

400

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

VIH vs. VIN

VIN (V)

VIH (V)

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.1

1.2

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°C 85°C

VIL vs. VIN

VIN (V)

VIL (V)

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.1

1.2

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°C 85°C

AAT3167

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

PRODUCT DATASHEET

8 3167.2009.09.1.5

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Functional Description

The AAT3167 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

AAT3167 charge pump is enabled when any of the five

current sink inputs near 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 AAT3167 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 five constant current sink inputs (D1 to D5) can

drive five individual LEDs with a maximum current of

27mA nominal each. Unused sink inputs should be con-

nected to OUTCP, otherwise the part will operate only in

2X charge pump mode. The AS2Cwire serial interface

enables the AAT3167 and sets the current sink magni-

tudes. AS2Cwire addressing allows independent control

of two groups of current sink input: D1~D4 and D5.

Constant Current Output Level Settings

The constant current sink levels for D1 to D5 are set via

the serial interface according to a logarithmic scale, where

each code is approximately 1.8dB lower than the previous

code. In this manner, LED brightness appears linear with

each increasing code count. Because the inputs D1 to D5

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.

Since the input current sinks of the AAT3167 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 micro-

controller or system IC to manage LED or display bright-

ness, allowing the user to “set it and forget it.” With its

high-speed serial interface (1MHz data rate), the input

sink current of the AAT3167 can be changed successively

to brighten or dim LEDs in smooth transitions (e.g., to

fade-out) or in abrupt steps, giving the user complete

programmability and real-time control of LED brightness.

Functional Block Diagram

D/A

AS2Cwire

Interface

Voltage

Reference

6 x 16 Bit

ROM

6 x 16 Bit

ROM

1MHz

Oscillator

Soft-Start

Control

1X, 1.5X, 2X

Charge Pump

EN/SET

GND

OUTCP

C1+ C1- C2+ C2-

D/A

AAT3167

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

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The 16 individual current level settings are each approx-

imately 2dB apart (see Table 1); the spacing at higher

settings is less than 2dB, whereas at lower settings it is

greater. Code 1 is full scale; Code 15 is full scale attenu-

ated by approximately 30dB; and Code 16 is reserved as

a “no current” setting.

Data 27mA Max

IOUT (mA) 18mA Max

IOUT (mA) 14mA Max

IOUT (mA)

127 18 14

222 15 11

3 18 12 8.8

4 14 10 7.1

5 12 7.9 6.0

6 10 6.3 4.8

7 8 5.1 3.8

8 6.2 4.1 3.1

9 5.2 3.5 2.6

10 4.3 2.9 2.1

11 3.3 2.2 1.7

12 2.9 1.9 1.4

13 2.4 1.6 1.2

14 1.9 1.3 1.0

15 1.4 1.0 0.7

16 0 0 0

Table 1: Current Level Settings.

AS2Cwire Serial Interface

The current sink input magnitude on AAT3167 is con-

trolled by AnalogicTech’s AS2Cwire serial digital input.

AS2Cwire adds addressing capability for multiple data

registers over the Simple Serial Control™ (S2Cwire™)

interface, which is only capable of controlling a single

Max Current, and Low Current.

Three addresses are used to control the two registers.

Address 0 addresses both registers simultaneously to

allow the loading of both registers with the same data

using a single write protocol. Address 1 addresses

addresses Register 2 for D5 current level settings.

AS2Cwire relies on the number of rising edges of the EN/

SET pin to address and load the registers. AS2Cwire

latches data or address after the EN/SET pin has been

held high for time TLAT

. Address or data is differentiated

by the number of EN/SET rising edges. Since the data

registers are 4 bits each, the differentiating number of

pulses is 24 or 16, so that Address 0 is signified by 17

rising edges, Address 1 by 18 rising edges, and Address

2 by 19 rising edges. Data is set to any number of rising

edges between 1 and including 16. A typical write proto-

col is a burst of EN/SET rising edges signifying a particu-

lar address, followed by a pause with EN/SET held high

for the TLAT timeout period, a burst of rising edges signify-

ing data, and a TLAT timeout for the data registers. Once

an address is set, then multiple writes consisting of data

only (without address) to the corresponding data register

are allowed. Address 0 is the default address on the first

rising edge after the AAT3167 has been disabled. If data

is presented on the first rising edge with no prior address,

both data registers are simultaneously loaded.

AS2Cwire Serial Interface Timing

Address Data

EN/SET

217 18

Address

Data Reg 1

Data Reg 2

12 . . . n <= 16

THI

TLO TLAT TLAT

AAT3167

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

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The maximum current level is determined by the value

set in Register 3, the Max Current register. Three scales

are available for high operating currents with maximum

current levels of 27mA, 18mA, or 14mA. Each scale

maintains approximately 1.8dB steps between settings.

A separate mode is available for ultra-low LED current

operation. When the Max Current register (Register 3) is

set to the Low Current setting, the Low Current register

(Register 4) must be programmed. The two most sig-

nificant bits of the Low Current register control whether

or not a given bank of current sinks is enabled. The least

two significant bits of the Low Current register set the

current level for both banks. For low-current settings,

the charge pump may be enabled if required by the bat-

tery voltage and LED forward voltage conditions, and 1X

mode quiescent current is approximately 100μA for mul-

tiple channels or 50μA for Channel 5 operation only. Both

banks of current sinks must be in the same high- or low-

current mode of operation.

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

than TOFF

, the AAT3167 enters shutdown mode and draws

less than 1μA from VIN. Data and Address registers are

reset to 0 during shutdown.

AS2Cwire Serial Interface Addressing

Address EN/SET

Rising Edges Data Register

AAT3167

0 17 1&2: D1~D5 Current

1 18 1: D1~D4 Current

2 19 2: D5 Current

3 20 3: Max Current

4 21 4: Low Current

Data Max Current

1 18mA

2 27mA

3 14mA

4Low Current

(see Low Current Register for values)

Low Current Register (Address 4)

Data Main Low

Current On Sub Low

Current On Current

1No No

2No No

3No No

4No No

5 No Yes 115μA

6 No Yes 175μA

7 No Yes 280μA

8 No Yes 400μA

9 Yes No 115μA

10 Yes No 175μA

11 Yes No 280μA

12 Yes No 400μA

13 Yes Yes 115μA

14 Yes Yes 175μA

15 Yes Yes 280μA

16 Yes Yes 400μA

Auto-Disable Feature

The AAT3167 is equipped with an auto-disable feature for

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

a test current of 120μA (typical) is forced through each

sink channel. The channel will be disabled if the voltage

of that particular SINK pin does not drop to a certain

threshold. This feature is very convenient for disabling an

unused channel or during an LED fail-short event.

Thermal Protection

The AAT3167 has a built-in thermal protection circuit

that will shut down the charge pump if the die tempera-

ture rises above the thermal limit, as would be the case

during a short circuit of the OUTCP pin.

AAT3167

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

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Applications Information

LED Selection

Although the AAT3167 is designed for driving white LEDs,

the device also can 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 diodes for remotes, and other

loads benefiting from a controlled output current gener-

ated from a varying input voltage. Since the D1 to D5

input current sinks are matched with negligible voltage

dependence, the LED brightness will be matched regard-

less of the specific LED forward voltage (VF) levels.

In some instances (e.g., in high luminous output applica-

tions such as photo flash), it may be necessary to drive

high-VF type LEDs. The low-dropout current sinks in the

AAT3167 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 AAT3167 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 AAT3167 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) (<100mΩ) ceramic capacitors are used.

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

point when choosing capacitors. If the LED current

sources are programmed only 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

AAT3167. 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

generally have tight tolerance and are very stable over

temperature. Larger capacitor values are usually com-

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

Large ceramic capacitors (i.e., greater than 2.2μF) are

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

capacitors greater than 1μF are not typically required for

AAT3167 applications.

Capacitor area is another contributor 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.

AAT3167

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

PRODUCT DATASHEET

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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

STDFN33-14 UCXYY AAT3167IFO-T1

QFN44-16 PWXYY AAT3167ISN-T1

All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor

products that are in compliance with current RoHS standards, including the requirement that lead not

exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at

http://www.analogictech.com/aboutus/quality.php.

Package Information3

STDFN33-14

Top View Bottom View

3.000

0.050

Index Area

3.000

0.050

Detail "A"

1.700

0.050

2.570

0.050

0.152 REF

0.550

0.050

0.025

Detail "A"

Side View

0.425

0.050

0.400 BSC

0.210

0.050

Pin 1 Indicator

(Optional)

R0.2

All dimensions in millimeters.

AAT3167

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

PRODUCT DATASHEET

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Advanced Analogic Technologies, Inc.

3230 Scott Boulevard, Santa Clara, CA 95054

Phone (408) 737-4600

Fax (408) 737-4611

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property rights are implied. AnalogicTech reserves the right to make changes to their products or speciﬁ cations or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and

conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties

relating to ﬁ tness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate

design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to

support this warranty. Speciﬁ c testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other

brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.

QFN44-16

4.000

0.050

Pin 1 Dot By Marking

2.400

0.050

0.550

0.020

2.400

0.050

4.000

0.050 2.280 REF

0.650 BSC

0.900

0.100

Pin 1 Identification

C0.3

13 16

0.025

0.214

0.036

0.330

0.075

Top View Bottom View

Side View

All dimensions in millimeters.