AAT3169IFO-T1 [ANALOGICTECH]
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications; 高效率1X / 1.5X / 2X电荷泵白光LED应用
| 型号： | AAT3169IFO-T1 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications |
| 文件： | 总13页 (文件大小：854K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
General Description
Features
The AAT3169 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
AAT3169 is capable of driving six LEDs for a total of
180mA 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.
• VIN Range: 2.7V to 5.5V
• Fully Programmable Current with Single Wire
16-Step Logarithmic Scale
15/20/30mA Max Current
Four Low-Current Settings Down to 115µA
Low IQ (65µA) for Single-Channel, Low-Current
▪
▪
▪
▪
Mode
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum
Efficiency and VF Coverage
• Drives Up to Six LEDs
• Individual Main-Sub (5-1) 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
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
65µA of housekeeping current.
• IQ <1µA in Shutdown
Each output of the AAT3169 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.
• Thermally-Enhanced STDFN33-14 or QFN44-16
Package
Applications
• Color (RGB) Lighting
• Programmable Current Sink
• Transmissive Displays
• White LED Backlighting
The AAT3169 is available in a Pb-free, space-saving,
thermally-enhanced 16-pin 4x4mm QFN package or a
low-profile 14-pin 3x3mm STDFN package and is rated
over the -40°C to +85°C temperature range.
• White Photo Flash for Digital Still Cameras
Typical Application
C1+
C1-
C2+
C1
C2
1µF
1µF
Main
D3
Sub
D6
C2-
OUTCP
COUT
1µF
IN
2.7V to 5.5V
CIN
1µF
D1
D2
D4
D5
AAT3169
D1
D2
D3
D4
D5
D6
EN/SET
EN/SET
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3169.2008.03.1.3
1
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Pin Descriptions
Pin #
AAT3169ISN AAT3169IFP
Symbol Function
1
2
3
2
3
n/a
D6
EN/SET
N/C
Current sink input #6.
AS2Cwire serial interface control pin.
No connection.
Charge pump output to drive load circuit. Requires 1µF capacitor connected between
this pin and ground.
4
6
OUTCP
5
6
7
7
4
5
8
10
9
11
12
13
14
1
C2+
C1+
C1-
C2-
GND
IN
D1
D2
D3
D4
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.
Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.
Flying capacitor 1 negative terminal.
Flying capacitor 2 negative terminal.
8
9, 11
10
12
13
14
15
16
EP
Ground.
Input power supply. Requires 1µF capacitor connected between this pin and ground.
Current sink input #1.
Current sink input #2.
Current sink input #3.
Current sink input #4.
Current sink input #5.
Exposed paddle (bottom); connect to ground as closely as possible to the package.
D5
n/a
Pin Configuration
QFN44-16
(Top View)
STDFN33-14
(Top View)
1
2
14
13
D5
D6
EN/SET
C1+
C1-
D4
D3
D2
D1
GND
IN
C2-
1
12
11
10
9
D6
D1
3
4
5
6
7
12
11
10
9
2
EN/SET
GND
IN
3
N/C
OUTCP
C2+
8
4
OUTCP
GND
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3169.2008.03.1.3
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Absolute Maximum Ratings1
Symbol
Description
Value
Units
VIN
Input Voltage to GND
EN/SET Voltage to GND
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
-0.3 to 6
-0.3 to VIN + 0.3
210
V
V
mA
°C
°C
VEN/SET
2
IOUT
TJ
TLEAD
-40 to 150
300
Thermal Information3
Symbol
Description
Value
Units
QFN44-164
STDFN33-144
QFN44-16
W
V
°C/W
°C
PD
Maximum Power Dissipation
2.0
50
θJA
Maximum Thermal Resistance
STDFN33-14
-40 to 150
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 20mW/°C above 25°C.
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3
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Electrical Characteristics1
CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C, VIN = 3.6V.
Symbol
Description
Conditions
Min
Typ
Max Units
Input Power Supply
VIN Operation Range
2.7
5.5
V
1X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
No Load Current, High Current Mode
1.5X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
No Load Current, High Current Mode
0.3
1
mA
ICC
Operating Current
2X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
1
No Load Current, High Current Mode
1X Mode, 3.0 ≤ VIN ≤ 5.5, D6 Active,
No Load Current, Low Current Mode
VEN/SET = 0V
65
90
µA
µA
ISHDN
IDX
Shutdown Current
Current Accuracy
1
ISET = 20mA, TA = 25°C
ISET = 2.4mA, TA = 25°C
ISET = 400µA, TA = 25°C
VF:D1:D6 = 3.6V
-10
-20
-20
10
20
20
1
%
Low Current Accuracy
Current Matching2
1X to 1.5X or 1.5X to 2X Transition
Threshold at Any ISINK Pin
I(D-Match)
VTH
0.5
%
ISET = 20mA
150
mV
Charge Pump Section
TSS
Soft-Start Time
100
µs
FCLK
Clock Frequency
1000
kHz
EN/SET
VEN(L)
VEN(H)
TEN/SET LO
TEN/SET_HI_MIN
TEN/SET_HI_MAX
TOFF
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
Minimum EN/SET High Time
Maximum EN/SET High Time
EN/SET Off Timeout
VIN = 2.7V
VIN = 5.5V
0.4
75
V
V
1.4
0.3
µs
ns
µs
µs
µs
µA
50
75
500
500
1
TLAT
IEN/SET
EN/SET Latch Timeout
EN/SET Input Leakage
-1
1. The AAT3169 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.
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3169.2008.03.1.3
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF, VIN = 3.6V, TA = 25°C, unless otherwise noted.
Turn-On to 1X Mode
(VIN = 4.2V; 20mA/Channel)
Efficiency vs. Supply Voltage
100
4.9mA/ch
VF = 2.9V
10.9mA/ch
VF = 3.1V
20mA/ch
VF = 3.4V
EN
(2V/div)
90
80
70
60
50
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Time (100µs/div)
Supply Voltage (V)
Turn-On to 1.5X Mode
(VIN = 3.8V; 20mA/Channel)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA/Channel)
EN
(2V/div)
EN
(2V/div)
CP
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
VSINK
(500mV/div)
IIN
(200mA/div)
IIN
(200mA/div)
Time (100µs/div)
Time (100µs/div)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA/Channel)
Current Matching vs. Temperature
20.2
20.0
19.8
19.6
19.4
19.2
Channel 1
Channel 2
EN
(2V/div)
Channel 5
VF
(1V/div)
Channel 3
IIN
(100mA/div)
Channel 4
Channel 6
60
-40
-20
0
20
40
80
Time (100µs/div)
Temperature (°C)
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3169.2008.03.1.3
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PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF, VIN = 3.6V, TA = 25°C, unless otherwise noted.
Load Characteristics
(VIN = 3.8V; 1.5X Mode; 15mA/Channel)
Load Characteristics
(VIN = 2.9V; 2X Mode; 15mA/Channel)
VIN
(40mV/div)
VIN
(40mV/div)
CP
(40mV/div)
CP
(40mV/div)
VSINK
(40mV/div)
VSINK
(40mV/div)
Time (500ns/div)
Time (500ns/div)
Load Characteristics
(VIN = 4.0V; 1.5X Mode; 20mA/Channel)
Load Characteristics
(VIN = 3.1V; 2X Mode; 20mA/Channel)
VIN
(40mV/div)
VIN
(40mV/div)
CP
(40mV/div)
CP
(40mV/div)
VSINK
(40mV/div)
VSINK
(40mV/div)
Time (500ns/div)
Time (500ns/div)
Load Characteristics
(VIN = 4.3V; 1.5X Mode; 30mA/Channel)
Load Characteristics
(VIN = 3.6V; 2X Mode; 30mA/Channel)
VIN
(40mV/div)
VIN
(40mV/div)
CP
(40mV/div)
CP
(40mV/div)
VSINK
(40mV/div)
VSINK
(40mV/div)
Time (500ns/div)
Time (500ns/div)
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3169.2008.03.1.3
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF, VIN = 3.6V, TA = 25°C, unless otherwise noted.
TLAT vs. VIN
TOFF vs. VIN
350
300
250
200
150
100
50
400
350
300
250
200
150
100
50
-40°C
-40°C
85°C
25°C
25°C
85°C
0
0
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
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
VIN (V)
VIN (V)
Input Ripple vs. VIN
VIH vs. VIN
1.2
1.1
25
20
15
10
5
1
30mA/ch
-40°C
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
25°C
85°C
20mA/ch
10.9mA/ch
0
2.50 2.67 2.84 3.01 3.18 3.35 3.52 3.69 3.86 4.03 4.20
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
VIN (V)
VIN (V)
VIL vs. VIN
1.2
1.1
1
-40°C
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
25°C
85°C
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
VIN (V)
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PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Functional Block Diagram
C1+ C1- C2+ C2-
1X, 1.5X, 2X
Charge Pump
IN
OUTCP
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
D1
D/A
D/A
D/A
D/A
D/A
D2
D3
D4
D5
Main
6 x 16 Bit
ROM
AS2Cwire
Interface
EN/SET
Sub
6 x 16 Bit
ROM
D/A
D6
GND
tudes. AS2Cwire addressing allows independent control
of two groups of current sink input: D1~D5 and D6.
Functional Description
The AAT3169 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
AAT3169 charge pump is enabled when any of the six
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 AAT3169 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).
Constant Current Output Level Settings
The constant current sink levels for D1 to D6 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 D6 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 AAT3169 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 AAT3169 can be changed suc-
cessively 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.
The six constant current sink inputs (D1 to D6) can drive
six individual LEDs with a maximum current of 30mA
nominal each. Unused sink inputs should be connected
to OUTCP, otherwise the part will operate only in 2X
charge pump mode. The AS2Cwire serial interface
enables the AAT3169 and sets the current sink magni-
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3169.2008.03.1.3
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
The 16 individual current level settings are each approx-
imately 1.8dB apart (see Table 1). Code 1 is full scale;
Code 15 is full scale attenuated by approximately 25dB;
and Code 16 is reserved as a “no current” setting.
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 AAT3169 has been disabled. If data
is presented on the first rising edge with no prior address,
both data registers are simultaneously loaded.
Mean
Mean
Mean
Data
30mA Max 20mA Max 15mA Max
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
30.0
29.3
27.8
25.2
22.8
20.9
18.5
16.1
13.7
10.0
9.4
20.0
19.5
18.5
17.5
15.4
14.2
12.5
10.9
9.3
8.0
6.5
4.9
3.3
15.0
14.6
13.9
12.7
11.5
10.5
9.3
8.1
7.0
6.0
4.9
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 30mA, 20mA, or 15mA. 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 sets the
current level for both banks. For low current settings, the
charge pump may be enabled if required by the battery
voltage and LED forward voltage conditions, and 1X
mode quiescent current is approximately 130µA for mul-
tiple channels or 65µA for Channel 6 operation only. Both
banks of current sinks must be in the same high or low
current mode of operation.
7.0
4.7
3.3
1.9
3.7
2.6
1.9
1.2
2.4
1.5
0.0
0.0
0.0
Table 1: Mean Table of AAT3169 Output Current.
AS2Cwire Serial Interface
The current sink input magnitude on the AAT3169 is con-
trolled by AnalogicTech’s Advanced Simple Serial Control
(AS2Cwire) serial digital input. AS2Cwire adds addressing
capability for multiple data registers over the Simple
Serial Control™ (S2Cwire™), which is only capable of
controlling a single register. The AAT3169 has four regis-
ters: Bank1, Bank2, Max Current, and Low Current.
When EN/SET is held low for an amount of time greater
than TOFF, the AAT3169 enters shutdown mode and draws
less than 1µA from the input. Data and Address registers
are reset to 0 during shutdown.
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
Register 1 for D1 to D5 current level settings. Address 2
addresses Register 2 for D6 current level settings.
AS2Cwire Serial Interface Addressing
EN/SET
Address Rising Edges
Data Register
AAT3169
0
1
2
3
4
17
18
19
20
21
1&2: D1~D6 Current
1: D1~D5 Current
2: D6 Current
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
3: Max Current
4: Low Current
Data
Max Current
1
2
3
4
20mA
30mA
15mA
Low Current (see Low Current Register for values)
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3169.2008.03.1.3
9
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Low Current Register (Address 4)
Auto-Disable Feature
AAT3169 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.
Main Low
Current On
Sub Low
Current On Current
Data
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Yes
Yes
115µA
175µA
280µA
400µA
115µA
175µA
280µA
400µA
115µA
175µA
280µA
400µA
Thermal Protection
The AAT3169 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.
AS2Cwire Serial Interface Timing
Address
Data
THI
TLAT
TLO
TLAT
EN/SET
1
2
17
18
1
2 . . .
n <= 16
0
Address
Data Reg 1
Data Reg 2
1
0
0
n
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3169.2008.03.1.3
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Capacitor Characteristics
Applications Information
Ceramic composition capacitors are highly recommend-
ed over all other types of capacitors for use with the
AAT3169. Ceramic capacitors offer many advantages
over their tantalum and aluminum electrolytic counter-
parts. A ceramic capacitor typically has very low equiva-
lent series resistance (ESR), is lowest cost, has a small-
er PCB footprint, and is non-polarized. Low ESR ceramic
capacitors help maximize charge pump transient
response. Since ceramic capacitors are non-polarized,
they are not prone to incorrect connection damage.
LED Selection
Although the AAT3169 is designed for driving white
LEDs, the device also can be used to drive most types of
LEDs with forward voltages from 2.0V to 4.7V. LED appli-
cations may include main and sub-LCD display back-
lighting, 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 D6 input
current sinks are matched with negligible voltage depen-
dence, the LED brightness will be matched regardless of
the specific LED forward voltage (VF) levels.
Equivalent Series Resistance
ESR is an important characteristic to consider when
selecting a capacitor. ESR is 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.
In some instances (e.g., in high luminous output appli-
cations such as photo flash), it may be necessary to
drive high-VF type LEDs. The low dropout current sinks
in the AAT3169 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.
Ceramic Capacitor Materials
Device Switching Noise Performance
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
AAT3169 applications.
The AAT3169 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 AAT3169 soft-start feature prevents noise
transient effects associated with inrush currents during
start-up of the charge pump circuit.
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.
Capacitor Selection
Careful selection of the four external capacitors (CIN, C1,
C2, and COUT) is important because they will affect turn-
on time, output ripple, and transient performance.
Optimum performance will be obtained when low ESR
ceramic capacitors are used; in general, low ESR may be
defined as less than 100mΩ. A value of 1µF for all four
capacitors is a good starting point when choosing capac-
itors. If the LED current sources are programmed only
for light current levels, then the capacitor size may be
decreased.
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3169.2008.03.1.3
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PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
STDFN33-14
QFN44-16
UNXYY
RVXYY
AAT3169IFO-T1
AAT3169ISN-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/about/quality.aspx.
Package Information3
STDFN33-14
Detail "A"
Index Area
1.700 ± 0.050
3.000 ± 0.050
Top View
Bottom View
0.425 ± 0.050
R0.2
0.025 ± 0.025
Pin 1 Indicator
(Optional)
Side View
Detail "A"
All dimensions in millimeters.
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.
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12
3169.2008.03.1.3
PRODUCT DATASHEET
AAT3169
TM
SwitchReg
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
QFN44-16
2.400 ± 0.050
Pin 1 Identification
0.330 ± 0.075
Pin 1 Dot By Marking
13
16
1
4
C0.3
9
8
5
4.000 ± 0.050
2.280 REF
Top View
Bottom View
0.214 ± 0.036
Side View
All dimensions in millimeters.
Advanced Analogic Technologies, Inc.
3230 Scott Boulevard, Santa Clara, CA 95054
Phone (408) 737-4600
Fax (408) 737-4611
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual
property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications 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 fitness 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. Specific 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.
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3169.2008.03.1.3
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