202158A.pdf

DATA SHEET
AAT3169
AAT3169 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, batterypowered 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
• IQ <1µA in Shutdown
• Thermally-Enhanced TDFN33-14, STDFN33-14,
QFN44-16, or TSOPJW-14 Package
Skyworks' 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.
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 lowcurrent shutdown feature disconnects the load from the
input and reduces quiescent current to less than 1µA.
The AAT3169 is available in a Pb-free, space-saving,
thermally-enhanced 16-pin 4x4mm QFN package, a
14-pin 3x3mm TDFN package, a low-profile 14-pin
3x3mm STDFN package or a 14-pin TSOPJW package and
is rated over the -40°C to +85°C temperature range.
Applications
•
•
•
•
•
Color (RGB) Lighting
Programmable Current Sink
Transmissive Displays
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
C1+
C2+
C1
1µF
C2
1µF
C1-
OUTCP
IN
2.7V to 5.5V
CIN
1µF
Main
C2-
AAT3169
Sub
COUT
1µF
D1
D2
D3
D4
D5
D6
D1
D2
D3
EN/SET
EN/SET
D4
D5
D6
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
1
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Pin Descriptions
Pin Number
AAT3169ISN
AAT3169IWO,
AAT3169IFO
AAT3169ITO
Symbol
1
2
3
2
3
n/a
13
12
n/a
D6
EN/SET
N/C
4
6
9
OUTCP
5
7
8
C2+
6
4
11
C1+
7
8
9, 11
5
8
10
10
7
5
C1C2GND
10
9
6
IN
12
13
14
15
16
11
12
13
14
1
4
3
2
1
14
D1
D2
D3
D4
D5
EP
n/a
n/a
Function
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.
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.
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.
Pin Configuration
QFN44-16
(Top View)
15
13
16
12
D1
EN/SET
2
11
GND
N/C
3
10
4
9
D5
D6
EN/SET
C1+
C1OUTCP
C2+
IN
GND
1
14
2
13
3
12
4
11
5
10
6
9
7
8
D4
D3
D2
D1
GND
IN
C2-
D4
D3
D2
D1
GND
IN
C2-
TSOPJW-14
(Top View)
1
14
2
13
3
12
4
11
5
10
6
9
7
8
D5
D6
EN/SET
C1+
C1OUTCP
C2+
8
7
6
5
C2C1-
C1+
C2+
2
14
D4
D2
D3
D5
D6
1
OUTCP
TDFN33-14,
STDFN33-14
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Absolute Maximum Ratings1
Symbol
VIN
VEN/SET
IOUT2
TJ
TLEAD
Description
Input Voltage to GND
EN/SET Voltage to GND
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
Units
-0.3 to 6
-0.3 to VIN + 0.3
210
-40 to 150
300
V
V
mA
°C
°C
Value
Units
Thermal Information3
Symbol
PD
qJA
Description
Maximum Power Dissipation
Maximum Thermal Resistance
QFN44-164
STDFN33-144
TDFN33-14
TSOPJW-14
QFN44-16
TDFN33-14
STDFN33-14
TSOPJW-14
2.0
W
0.625
50
°C/W
160
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
3
DATA SHEET
AAT3169
AAT3169 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
Input Power Supply
VIN
Operation Range
ICC
ISHDN
IDX
Operating Current
Shutdown Current
Current Accuracy
Low Current Accuracy
I(D-Match)
Current Matching2
1X to 1.5X or 1.5X to 2X Transition
VTH
Threshold at Any ISINK Pin
Charge Pump Section
TSS
Soft-Start Time
FCLK
Clock Frequency
EN/SET
VEN(L)
Enable Threshold Low
VEN(H)
Enable Threshold High
TEN/SET LO
EN/SET Low Time
TEN/SET_HI_MIN
Minimum EN/SET High Time
TEN/SET_HI_MAX
Maximum EN/SET High Time
TOFF
EN/SET Off Timeout
TLAT
EN/SET Latch Timeout
IEN/SET
EN/SET Input Leakage
Min
Typ
2.7
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
2X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
No Load Current, High Current Mode
1X Mode, 3.0 ≤ VIN ≤ 5.5, D6 Active,
No Load Current, Low Current Mode
VEN/SET = 0V
ISET = 20mA, TA = 25°C
ISET = 2.4mA, TA = 25°C
ISET = 400µA, TA = 25°C
VF:D1:D6 = 3.6V
Units
5.5
V
0.3
1
mA
1
65
-10
-20
-20
ISET = 20mA
VIN = 2.7V
VIN = 5.5V
Max
90
µA
1
10
20
20
µA
%
0.5
%
150
mV
100
1000
µs
kHz
0.4
1.4
0.3
75
50
-1
75
500
500
1
V
V
µs
ns
µs
µs
µs
µA
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 correlation with statistical process controls.
2. Current matching is defined as the deviation of any sink current from the average of all active channels.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3169
AAT3169 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
Efficiency vs. Supply Voltage
(VIN = 4.2V; 20mA/Channel)
100
4.9mA/ch
VF = 2.9V
10.9mA/ch
VF = 3.1V
20mA/ch
VF = 3.4V
EN
(2V/div)
Efficiency (%)
90
CP
(2V/div)
VSINK
(500mV/div)
80
70
60
IIN
(200mA/div)
50
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
Turn-On to 2X Mode
(VIN = 3.8V; 20mA/Channel)
EN
(2V/div)
(VIN = 2.8V; 20mA/Channel)
EN
+25°C
(2V/div)+85°C
CP
(2V/div)
VSINK
(500mV/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
IIN
(200mA/div)
Time (100µs/div)
Time (100µs/div)
Turn-Off from 1.5X Mode
Current Matching vs. Temperature
(VIN = 3.5V; 20mA/Channel)
20.2
Channel 1
Channel 2
EN
(2V/div)
Current (mA)
20.0
VF
(1V/div)
IIN
(100mA/div)
19.8
Channel 5
19.6
Channel 3
19.4
Channel 4
Channel 6
19.2
-40
Time (100µs/div)
-20
0
20
40
60
80
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
5
DATA SHEET
AAT3169
AAT3169 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
Load Characteristics
(VIN = 3.8V; 1.5X Mode; 15mA/Channel)
(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
Load Characteristics
(VIN = 4.0V; 1.5X Mode; 20mA/Channel)
(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
Load Characteristics
(VIN = 4.3V; 1.5X Mode; 30mA/Channel)
(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)
6
Time (500ns/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3169
AAT3169 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
400
350
300
-40°C
-40°C
300
TOFF (µs)
TLAT (µs)
250
200
150
25°C
85°C
100
250
200
25°C
150
85°C
100
50
50
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
25
1
-40°C
0.9
15
10
VIH (V)
Amplitude (mV)
1.1
30mA/ch
20
20mA/ch
0.8
0.7
25°C
0.6
85°C
0.5
10.9mA/ch
5
0.4
0.3
0.2
0
2.50
2.67
2.84
3.01
3.18
3.35
3.52
3.69
3.86
4.03
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
4.20
VIN (V)
VIN (V)
VIL vs. VIN
1.2
1.1
1
VIL (V)
0.9
-40°C
0.8
0.7
0.6
0.5
25°C
85°C
0.4
0.3
0.2
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
VIN (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
7
DATA SHEET
AAT3169
AAT3169 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
Main
6 x 16 Bit
ROM
EN/SET
AS2Cwire
Interface
Sub
6 x 16 Bit
ROM
D/A
D1
D/A
D2
D/A
D3
D/A
D4
D/A
D5
D/A
D6
GND
Functional Description
of two groups of current sink input: D1~D5 and D6.
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 monitors 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 initially 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 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 magnitudes. AS2Cwire addressing allows independent control
8
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 programmable, no PWM (pulse width modulation) or additional control circuitry is needed to control LED brightness. 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 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.
The 16 individual current level settings are each approximately 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Data
Mean
30mA Max
Mean
20mA Max
Mean
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
11.5
9.4
7.0
4.7
3.3
1.9
0.0
20.01
19.5
18.5
17.0
15.4
14.2
12.5
10.9
9.3
8.0
6.5
4.9
3.3
2.4
1.5
0.0
15.0
14.6
13.9
12.7
11.5
10.5
9.3
8.1
7.0
6.0
4.9
3.7
2.6
1.9
1.2
0.0
Table 1: Mean Table of AAT3169 Output Current.
AS2Cwire Serial Interface
The current sink input magnitude on the AAT3169 is controlled by Skyworks' 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 registers: Bank1, Bank2, 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
Register 1 for D1 to D5 current level settings. Address 2
addresses Register 2 for D6 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 protocol is a burst of EN/SET rising edges, signifying a particular address, followed by a pause with EN/SET held
high for the TLAT timeout period, a burst of rising edges
signifying 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.
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 significant 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 multiple 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.
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. During shutdown, the
address register is reset to 0 and data registers are reset
to their default values.
AS2Cwire Serial Interface Addressing
Address
EN/SET
Rising Edges
Data Register
AAT3169
01
1
2
3
4
17
18
19
20
21
1&2: D1~D6 Current
1: D1~D5 Current
2: D6 Current
3: Max Current
4: Low Current
Data
Max Current
11
2
3
4
20mA
30mA
15mA
Low Current (see Low Current Register for values)
1. Denotes the default values after EN/SET is toggled high.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
9
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Low Current Register (Address 4)
Auto-Disable Feature
Data
Main Low
Current On
Sub Low
Current On
Current
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
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.
Thermal Protection
The AAT3169 has a built-in thermal protection circuit
that will shut down the charge pump if the die temperature 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
TLO
TLAT
TLAT
EN/SET
1
Address
10
2
17
18
1
0
2...
n <= 16
1
Data Reg 1
0
Data Reg 2
0
n
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DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Applications Information
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 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 D6 input
current sinks are matched with negligible voltage dependence, the LED brightness will be matched regardless of
the specific LED forward voltage (VF) levels.
Capacitor Characteristics
Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the
AAT3169. Ceramic capacitors offer many advantages
over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low
Equivalent Series Resistance (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 capacitors are non-polarized, they are not prone to incorrect connection damage.
Equivalent Series Resistance
In some instances (e.g., in high luminous output applications 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.
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 connections, size or area, material composition, and ambient
temperature. Capacitor ESR is typically measured in milliohms for ceramic capacitors and can range to more
than several ohms for tantalum or aluminum electrolytic
capacitors.
Device Switching Noise Performance
Ceramic Capacitor Materials
The AAT3169 operates at a fixed frequency of approximately 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 inductor-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.
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 composed 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.
Capacitor Selection
Careful selection of the four external capacitors (CIN, C1,
C2, and COUT) is important because they will affect turnon 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 100mW. 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 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
11
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
DC-
DC+
J1
1
2
3
4
5
6
7
C1
1µF
C3
1µF
JP8
DC+
U1
D5
D6
EN/SET
C1+
C1OUTCP
C2+
14
13
12
11
10
9
8
D4
D3
D2
D1
GND
IN
C2-
AAT3169-STDFN33-14
C2
1uF
JP1
JP2
JP3
JP4
JP5
JP6
D1
D2
D3
D4
D5
D6
C4
1µF
C2
1µF
JP7
R7
R6
100K
220
J2
DC+
R3 R2 R1
1K 1K 1K
CYCLE
SW3
SW2
SW1
12
34
5
12
34
5
12
34
5
0
0
0
UP
DOWN
1
2
3
4
U2
VDD
GP5
GP4
GP3
VSS
GP0
GP1
GP2
PIC12F675
VR4
POT10K
8
7
6
5
C5
10µF
LED2
RED
R8
1.5K
LED1
GRN
Figure 1: AAT3169IFO Evaluation Board Schematic.
12
R5
1.5K
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
DC+
JP7
4
OUTCP
D3
D2
D1
12
GND
11
IN
10
9
GND
JPx
C4
1µF
C2-
NC
C1-
ENSET
3
C1+
D6
2
C2+
1
8
7
6
(QFN44-16)
5
GND
D4
AAT3169
D5
U1
C3
1µF
DC+
13
14
15
16
JP8
DC-
J1
GND
C1
1µF
D1
D2
D3
D4
D5
D6
C2
1µF
R7
220
J2
R6
100K
DC+
GND
R3 R2 R1
1K 1K 1K
SW3
SW2
SW1
GND
12
34
5
12
34
5
12
34
5
0
0
0
CYCLE
UP
DOWN
1
2
3
4
U2
PIC12F675
VDD
GP5
GP4
GP3
VSS
GP0
GP1
GP2
VR4
POT10K
8
7
6
5
C5
10µF
R5
1.5k
LED7
RED
R8
1.5k
GND
GND
LED0
GRN
GND
Figure 2: AAT3169ISN Evaluation Board Schematic.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
13
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
DC+
DC+
JP8
DC-
J1
GND
U1
1
2
3
4
5
6
7
IN
JPx
C4
1µF
D6
D5
D4
D3
D2
TSOPJW14
D4
D3
D2
D1
GND
IN
C2-
14
13
12
11
10
9
8
C1
1µF
C3
1µF
AAT3169
JP7
C2
1µF
D1
GND
D5
D6
EN/SET
C1+
C1OUTCP
C2+
GND
GND
R7
220
J2
R6
100K
GND
R3
1K
CYCLE
SW3
SW2
SW1
12
34
5
12
34
5
12
34
5
0
UP
R2
1K
R1
1K
U2
1
2
3
4
VDD
GP5
GP4
GP3
DC+
PIC12F675
VSS
GP0
GP1
GP2
VR4
POT10K
8
7
6
5
0
DOWN
R8
1.5k
GND
LED0
GRN
GND
Figure 3: AAT3169ITO Evaluation Board Schematic.
14
R5
1.5k
LED7
RED
0
GND
C5
10µF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
GND
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Figure 4: AAT3169IFO Evaluation Board
Top Side Layout.
Figure 5: AAT3169IFO Evaluation Board
Bottom Side Layout.
Figure 6: AAT3169ISN Evaluation Board
Top Side Layout.
Figure 7: AAT3169ISN Evaluation Board
Bottom Side Layout.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
15
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
16
Figure 8: AAT3169ITO Evaluation Board
Top Side Layout.
Figure 9: AAT3169ITO Evaluation Board
Bottom Side Layout.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3169
AAT3169 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
TSOPJW-14
TDFN33-14
UNXYY
RVXYY
7LXYY
7ZXYY
AAT3169IFO-T1
AAT3169ISN-T1
AAT3169ITO-T1
AAT3169IWO-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 Information3
TDFN33-14
Detail "A"
3.000 ± 0.050
2.500 ± 0.050
Index Area
3.000 ± 0.050
1.650 ± 0.050
Top View
Bottom View
+ 0.100
- 0.000
Pin 1 Indicator
(Optional)
0.180 ± 0.050
Side View
0.400 BSC
0.000
0.203 REF
0.750 ± 0.050
0.425 ± 0.050
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
17
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
STDFN33-14
Detail "A"
3.000 ± 0.050
2.570 ± 0.050
Index Area
3.000 ± 0.050
1.700 ± 0.050
Top View
Bottom View
0.152 REF
0.025 ± 0.025
Pin 1 Indicator
(Optional)
0.210 ± 0.050
Side View
R0.2
0.400 BSC
0.550 ± 0.050
0.425 ± 0.050
Detail "A"
QFN44-16
2.400 ± 0.050
16
1
2.400 ± 0.050
C0.3
0.650 BSC
4
8
5
2.280 REF
Top View
0.025 ± 0.025
Bottom View
0.214 ± 0.036
0.900 ± 0.100
4.000 ± 0.050
13
9
4.000 ± 0.050
Pin 1 Identification
0.330 ± 0.075
0.550 ± 0.020
Pin 1 Dot By Marking
Side View
All dimensions in millimeters.
18
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202158A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3169
AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
TSOPJW-14
2.85 ± 0.20
2.40 ± 0.10
0.20 +- 0.10
0.05
0.40 BSC
Top View
0.04 REF
0.05 +- 0.05
0.04
Side View
0.15 ± 0.05
+ 0.05
1.05 - 0.00
+ 0.000
1.00 - 0.075
3.05 +- 0.05
0.10
4° ± 4°
0.45 ± 0.15
2.75 ± 0.25
End View
All dimensions in millimeters.
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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. Skyworks may change its documentation, products, services, specifications 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 conflicts, incompatibilities, or other difficulties 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 hereunder, 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, INCLUDING 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 environmental 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 specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. 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 specifications 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
identification 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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19