aat3167 data sheet - Skyworks Solutions, Inc.

DATA SHEET
AAT3167
AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
General Description
Features
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, batterypowered applications.
•VIN 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
•IQ <1µA in Shutdown
• STDFN33-14 or QFN44-16 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 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 lowcurrent 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.
Applications
• Color (RGB) Lighting
• Programmable Current Sink
• Transmissive LCD Display
• White LED Backlighting
• White Photo Flash for Digital Still Cameras
Typical Application
C1+
C2+
C1
1µF
C2
1µF
C1-
C2-
IN
2.7V to 5.5V
CIN
1µF
OUTCP
AAT3167
GND
D1
D2
D3
D4
D5
COUT
1µF
D1
D2
EN/SET
EN/SET
D3
D4
D5
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
1
DATA SHEET
AAT3167
AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Pin Descriptions
Pin Number
AAT3167ISN
AAT3167IFO
Symbol
1, 3
2
n/a
3
N/C
EN/SET
4
6
OUTCP
5
7
C2+
6
4
C1+
7
8
9, 11
5
8
9, 11
C1C2GND
10
10
IN
12
13
14
15
16
EP
12
13
14
1
2
EP
D1
D2
D3
D4
D5
Function
No connection.
AS2Cwire serial interface control pin.
Charge pump output to drive load circuit. Requires 1µF ceramic capacitor connected
between this pin and ground.
Flying capacitor 2 positive terminal. Connect a 1µF ceramic capacitor between C2+
and C2-.
Flying capacitor 1 positive terminal. Connect a 1µF ceramic capacitor between C1+
and C1-.
Flying capacitor 1 negative terminal.
Flying capacitor 2 negative terminal.
Ground.
Input power supply. Requires 1µF ceramic 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
1
12
EN/SET
2
11
N/C
3
10
OUTCP
4
9
D1
D4
D5
EN/SET
C1+
C1OUTCP
C2+
GND
IN
GND
1
14
2
13
3
12
4
11
5
10
6
9
7
8
D3
D2
D1
GND
IN
GND
C2-
8
7
6
5
C2C1-
C1+
C2+
2
14
D4
D2
D3
D5
N/C
STDFN33-14
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3167
AAT3167 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
150
-40 to 150
300
V
V
mA
°C
°C
Value
Units
2.0
W
50
°C/W
Thermal Information3
Symbol
Description
PD
Maximum Power Dissipation
qJA
Maximum Thermal Resistance
QFN44-164
STDFN33-144
QFN44-16
STDFN33-14
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
3
DATA SHEET
AAT3167
AAT3167 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 TA = 25°C, VIN = 3.6V.
Symbol
Description
Conditions
Input Power Supply
VIN
Operation Range
ICC
ISHDN
Operating Current
Shutdown Current
High Current Accuracy
IDX
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
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, D5 Active,
IDS = 100µA, Low Current Mode
VEN/SET = 0V
ISET = 18mA, TA = 25°C
ISET = 400µA, TA = 25°C
VF:D1:D5 = 3.6V
VIN = 2.7V
VIN = 5.5V
Max
Units
5.5
V
0.3
1
mA
1
50
1
10
-10
15
0.5
1
µA
%
%
%
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 AAT3167 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
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3167
AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF; TA = 25°C, VIN = 3.6V, unless otherwise noted.
Efficiency vs. Supply Voltage
Turn-On to 1X Mode
(VIN = 4.2V; 18mA Load)
100
90
5.1mA
VF = 3.0V
18mA
VF = 3.4V
EN
(2V/div)
Efficiency (%)
80
70
OUT
(2V/div)
VSINK
(500mV/div)
60
50
40
30
350µA
VF = 2.7V
20
IIN
(200mA/div)
10
0
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
Supply Voltage (V)
Time (100µs/div)
Turn-On to 1.5X Mode
Turn-On to 2X Mode
(VIN = 3.5V; 18mA Load)
(VIN = 2.8V; 18mA Load)
EN
(2V/div)
EN
(2V/div)
OUT
(2V/div)
OUT
(2V/div)
VSINK
(500mV/div)
VSINK
(500mV/div)
IIN
(200mA/div)
IIN
(200mA/div)
Time (100µs/div)
Time (100µs/div)
Current Matching vs. Temperature
Turn-Off from 1.5X Mode
(VIN = 3.5V; 18mA Load)
19.0
EN
(2V/div)
18.8
Channel 2
Current (mA)
18.6
VF
(1V/div)
IIN
(100mA/div)
Channel 3
18.4
18.2
18.0
17.8
Channel 4
Channel 1
17.6
17.4
Channel 5
17.2
17.0
Time (100µs/div)
-40
-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
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
5
DATA SHEET
AAT3167
AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF; TA = 25°C, VIN = 3.6V, unless otherwise noted.
Load Characteristics
Load Characteristics
(VIN = 3.9V; 1.5X Mode; 18mA Load)
(VIN = 2.9V; 2X Mode; 18mA Load)
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 = 4.2V; 1.5X Mode; 27mA Load)
(VIN = 3.3V; 2X Mode; 27mA Load)
VIN
(40mV/div)
VIN
(40mV/div)
CP
(40mV/div)
CP
(40mV/div)
VSINK
(40mV/div)
VSINK
(40mV/div)
Time (500ns/div)
Time (500ns/div)
Input Ripple vs. Input Voltage
18
Input Ripple (mV)
16
27mA
14
18mA
12
10
8
6
14mA
4
2
0
2.5
2.7
2.9
3.1
3.3
3.5
3.7
Input Voltage (V)
6
3.9
4.1
4.3
4.5
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3167
AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF; TA = 25°C, VIN = 3.6V, 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
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)
VIH vs. VIN
VIL vs. VIN
1.2
1.2
1.1
1.1
1
-40°C
1
0.9
0.9
0.8
0.8
0.7
25°C
0.6
85°C
VIL (V)
VIH (V)
250
0.7
0.6
0.5
0.5
0.4
0.4
0.3
0.3
0.2
-40°C
25°C
85°C
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
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)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
7
DATA SHEET
AAT3167
AAT3167 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
6 x 16 Bit
ROM
EN/SET
AS2Cwire
Interface
6 x 16 Bit
ROM
D/A
D1
D/A
D2
D/A
D3
D/A
D4
D/A
D5
GND
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 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
AAT3167 charge pump is enabled when any of the five
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 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 connected to OUTCP, otherwise the part will operate only in
2X charge pump mode. The AS2Cwire serial interface
8
enables the AAT3167 and sets the current sink magnitudes. 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 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 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3167
AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
The 16 individual current level settings are each approximately 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 attenuated 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)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
27
22
18
14
12
10
8
6.2
5.2
4.3
3.3
2.9
2.4
1.9
1.4
0
18
15
12
10
7.9
6.3
5.1
4.1
3.5
2.9
2.2
1.9
1.6
1.3
1.0
0
14
11
8.8
7.1
6.0
4.8
3.8
3.1
2.6
2.1
1.7
1.4
1.2
1.0
0.7
0
registers over the Simple Serial Control™ (S2Cwire™)
interface, which is only capable of controlling a single
register. The AAT3167 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 D4 current level settings. Address 2
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 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 AAT3167 has been disabled. If data
is presented on the first rising edge with no prior address,
both data registers are simultaneously loaded.
Table 1: Current Level Settings.
AS2Cwire Serial Interface
The current sink input magnitude on AAT3167 is controlled by Skyworks' AS2Cwire serial digital input.
AS2Cwire adds addressing capability for multiple data
AS2Cwire Serial Interface Timing
Address
Data
THI
TLO
TLAT
TLAT
EN/SET
1
Address
2
17
18
1
0
2...
n <= 16
1
Data Reg 1
0
Data Reg 2
0
n
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
9
DATA SHEET
AAT3167
AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
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 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 set 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 100µA for multiple channels or 50µA for Channel 5 operation only. Both
banks of current sinks must be in the same high- or lowcurrent 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
1
2
3
4
17
18
19
20
21
1&2: D1~D5 Current
1: D1~D4 Current
2: D5 Current
3: Max Current
4: Low Current
Data
Max Current
1
2
3
18mA
27mA
14mA
Low Current
(see Low Current Register for values)
4
10
Low Current Register (Address 4)
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
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 temperature rises above the thermal limit, as would be the case
during a short circuit of the OUTCP pin.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3167
AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
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 generated 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 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 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 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 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) (<100mW) 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 counterparts. A ceramic capacitor typically has very low ESR, is
lowest cost, has a smaller PCB footprint, and is nonpolarized. 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
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 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.
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 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
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
11
DATA SHEET
AAT3167
AAT3167 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
UCXYY
PWXYY
AAT3167IFO-T1
AAT3167ISN-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
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
Pin 1 Indicator
(Optional)
0.210 ± 0.050
Side View
R0.2
0.400 BSC
0.025 ± 0.025
0.152 REF
0.550 ± 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.
12
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202157A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 11, 2012
DATA SHEET
AAT3167
AAT3167 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
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.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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