AAT3164IRN-T1 [ANALOGICTECH]
High Efficiency 1X/1.5X/2X Charge Pump for Six-Channel White LED Applications; 高效率1X / 1.5X / 2X电荷泵六路白光LED应用
| 型号： | AAT3164IRN-T1 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | High Efficiency 1X/1.5X/2X Charge Pump for Six-Channel White LED Applications |
| 文件： | 总14页 (文件大小：393K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
™
ChargePump
General Description
Features
The AAT3164 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-
mode load switch (1X), fractional (1.5X), and dou-
bling (2X) conversion to maximize efficiency for
white LED applications. The device is capable of
driving up to six channels of LEDs at up to 30mA
per channel 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 OUT) makes this part ideally
suited for small, battery-powered applications.
•
•
VIN Range: 2.7V to 5.5V
Tri-Mode (1X/1.5X/2X) Charge Pump Operation
— Maximizes Efficiency and LED VF
Coverage
— 1MHz Constant Switching Frequency
— No Inductors, Low Noise Operation
Drives Six Channels of LEDs up to 30mA/
Channel
— User-Programmable RSET Sets Maximum
LED Current
— Excellent LED Channel-to-Channel
Current Match
•
•
Digitally Programmable LED Current with
AnalogicTech's patented single-wire Simple Serial
Control™ (S2Cwire™) serial digital input is used to
enable, disable, and set current for each LED with
16 levels from a maximum of 40mA down to 50µA.
The maximum current level is programmed via an
external resistor. To save power, the low-current
mode supply current can be programmed as low
as 70µA.
Single-Wire S2Cwire Interface
— 16 Current Levels From ILED_MAX to 50µA
Low IQ (70µA) for Low Current Mode Operation
True Load Disconnect in Shutdown; IQ < 1µA
Built-In Thermal Protection
Built-In Auto-Disable for Open LED Circuit
Automatic Soft-Start Minimizes Inrush Startup
Current
•
•
•
•
•
Each output of the AAT3164 is equipped with built-
in protection for VOUT short-circuit and auto-disable
for LED short-circuit conditions. Built-in soft-start
circuitry prevents excessive inrush current during
start-up. A low-current shutdown feature discon-
nects the load from VIN and reduces quiescent cur-
rent to less than 1µA.
•
Small 3x4mm TDFN34-16 Package
Applications
•
•
•
•
Color (RGB) Lighting
Programmable Current Sinks
White LED Backlighting
The AAT3164 is available in a Pb-free, space-saving,
ultra-thin (3x4x0.75mm), thermally-enhanced 16-pin
TDFN package.
White Photo Flash for Digital Still Cameras
Typical Application
1µF
1µF
C1+ C1- C2+ C2-
IN
OUT
Li-Ion
Battery
NOM = 3.6V
AAT3164
CIN
µF
COUT
µF
D1 D2 D3 D4 D5 D6
1
1
V
OSRAM
LW M67C
GND
D1
D2
D3
D4
D5
EN/SET
EN/SET
RSET
D6
26.1K
1%
3164.2006.07.1.0
1
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
Pin Descriptions
Pin #
Symbol
Function
1
2
3
4
5
6
7
D5
D6
Current sink input #5.
Current sink input #6.
RSET
EN/SET
C1+
Connect resistor here to set maximum output current level. 1% resistor is recommended.
Enable Input or S2Cwire serial interface control.
Flying Capacitor 1 positive terminal. Connect a 1µF ceramic capacitor between C1+ and C1-.
Flying Capacitor 1 negative terminal.
C1-
OUT
Charge pump output to drive load circuit. Requires 1µF ceramic capacitor connected between
this pin and ground.
8
9
C2+
C2-
GND
IN
Flying Capacitor 2 positive terminal. Connect a 1µF ceramic capacitor between C2+ and C2-.
Flying Capacitor 2 negative terminal.
10, 12
11
Ground.
Input power supply. Requires 1µF ceramic capacitor connected between this pin and ground.
Current sink input #1.
13
D1
14
D2
Current sink input #2.
15
D3
Current sink input #3.
16
D4
Current sink input #4.
EP
Exposed paddle; connect to GND directly beneath the package.
Pin Configuration
TDFN34-16
(Top View)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
D4
D3
D2
D1
GND
IN
GND
C2-
D5
D6
RSET
EN/SET
C1+
C1-
OUT
C2+
2
3164.2006.07.1.0
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
Absolute Maximum Ratings1
Symbol
Description
Value
Units
VIN
Input Voltage
-0.3 to 6
-0.3 to VIN + 0.3
300
V
V
VEN/SET
EN/SET to GND Voltage
2
IOUT
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
mA
°C
°C
TJ
-40 to 150
300
TLEAD
Thermal Information3
Symbol
Description
Value
Units
PD
Maximum Power Dissipation4
2
W
θJA
Maximum Thermal Resistance
50
°C/W
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.
3164.2006.07.1.0
3
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
Electrical Characteristics1
CIN = COUT = C1 = C2 = 1µF; 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
1
V
1X Mode, 3.0V ≤ VIN ≤ 5.5V,
Active, No Load Current
1.5X Mode, 3.0V ≤ VIN ≤ 5.5V,
Active, No Load Current
2X Mode, 3.0V ≤ VIN ≤ 5.5V,
Active, No Load Current
50µA LED Current Setting, 1X Mode
EN/SET = 0
0.3
1
3
3
mA
ICC
Operating Current
Shutdown Current
1
70
µA
µA
ISHDN
1
7
TA = -20°C to +85°C, RSET = 26.1kΩ,
Data = 1 (100%)
-7
-8
±2
±2
TA= -40°C to +85°C, RSET = 26.1kΩ,
Data = 1 (100%)
ISINK Average Current
Accuracy
8
IDX
%
TA= -40°C to +85°C, RSET = 26.1kΩ,
Data = 12 (14%)
-20
-10
20
TA= 25°C, Data = 14 (1mA)
10
1
I(D-Match)
VTH
Current Matching2
1X to 1.5X or 1.5X to 2X
Transition Threshold at
Any ISINK Pin
0.5
%
150
mV
ISET
Current Set Ratio
RSET Pin Voltage
ISINK/IRSET
870
0.6
A/A
V
VRSET
Charge Pump Section
TSS
FCLK
Soft-Start Time
Output Ramp Up Time
100
µs
Clock Frequency
1000
kHz
EN/SET
VEN(L)
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
0.4
75
V
V
VEN(H)
1.4
0.3
TEN/SET LO
µs
ns
µs
µs
µs
µA
TEN/SET HI(MIN) Minimum EN/SET High Time
TEN/SET HI(MAX) Maximum EN/SET High Time
50
75
500
500
1
TOFF
TLAT
EN/SET Off Timeout
EN/SET Latch Timeout
EN/SET Input Leakage
IEN/SET
VEN/SET = 5V
-1
1. The AAT3164 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
3164.2006.07.1.0
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF; TA = 25°C, RSET = 26.1kΩ, VIN = 3.6V, unless otherwise noted.
Efficiency vs. Supply Voltage
Turn-On to 1X Mode
(VIN = 4.2V; 20mA/Channel; Data 1)
100
90
80
70
60
50
5.0mA/ch
VF = 2.9V
10.2mA/ch
VF = 3.1V
20mA/ch
VF = 3.4V
EN
(2V/div)
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
Supply Voltage (V)
Time (100µs/div)
Turn-On to 1.5X Mode
(VIN = 3.8V; 20mA/Channel; Data 1)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA/Channel; Data 1)
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; Data 1)
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
Channel 4
Channel 6
IIN
(100mA/div)
60
-40
-20
0
20
40
80
Time (100µs/div)
Temperature (°°C)
3164.2006.07.1.0
5
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF; TA = 25°C, RSET = 26.1kΩ, VIN = 3.6V, unless otherwise noted.
Load Characteristics
(VIN = 3.8V; 1.5X Mode; 14.2mA/Channel; Data 3)
Load Characteristics
(VIN = 2.9V; 2X Mode; 14.2mA/Channel; Data 3)
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; Data 1)
Load Characteristics
(VIN = 3.1V; 2X Mode; 20mA/Channel; Data 1)
VIN
(40mV/div)
VIN
(40mV/div)
CP
(40mV/div)
CP
(40mV/div)
VSINK
(40mV/div)
VSINK
(40mV/div)
Time (500ns/div)
Time (500ns/div)
TOFF vs. VIN
-40°C
TLAT vs. VIN
350
300
250
200
150
100
50
400
350
300
250
200
150
100
50
-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)
6
3164.2006.07.1.0
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1.0µF; TA = 25°C, RSET = 26.1kΩ, VIN = 3.6V, unless otherwise noted.
Maximum LED Current vs. RSET
VIH vs. VIN
1.2
1.1
45
40
35
30
25
20
15
10
5
1
-40°C
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
25°C
85°C
0
10 15 20 25 30 35 40 45 50 55 60 65 70 75
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
RSET (kΩ)
VIN (V)
VIL vs. VIN
Input Ripple vs. VIN
1.2
1.1
1
20
18
16
14
12
10
8
20mA/ch
-40°C
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
25°C
85°C
6
10.2mA/ch
4
2
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 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
VIN (V)
VIN (V)
3164.2006.07.1.0
7
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
Functional Block Diagram
C1+ C1- C2+ C2-
1x, 1.5x and 2x
Charge Pump
OUT
IN
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
D/A
D/A
D/A
D/A
D1
D2
D3
D4
S2Cwire
Interface
6 x 16 bit
ROM
EN/SET
D/A
D/A
D5
D6
Maximum
Current
Adjustment
GND
RSET
The S2Cwire serial interface enables the AAT3164
and sets the current sink magnitudes. Since all cur-
rent sinks are truly independent constant current
sinks, the voltage observed on any single given
input will be determined by the actual forward volt-
age (VF) for the LED being driven. Unused sink
inputs must be connected to OUT, otherwise the
part will operate in 2X charge pump mode only.
Functional Description
The AAT3164 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 AAT3164
charge pump is enabled when any of the six cur-
rent sink inputs near dropout. The charge pump
initially starts in 1.5X mode. If the charge pump
output droops enough for any current sink input to
become close to dropout, the charge pump will
automatically transition to 2X mode. The AAT3164
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 current sink magnitude is controlled by
AnalogicTech's S2Cwire serial digital input. The
maximum current is programmed by an external
resistor at the RSET pin. Since each current sink is
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 man-
age LED or display brightness, allowing the user to
"set it and forget it." With its high-speed serial inter-
face (1MHz data rate), the input sink current can be
changed quickly and easily. The code settings for
the AAT3164 are listed in Table 1.
8
3164.2006.07.1.0
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
operation. This mode is enabled by setting Data 13
to 16. While the AAT3164 is operating in low current
and 1X mode, the total quiescent current is reduced
to typically 70µA. When EN/SET is held low for an
amount of time longer than TOFF (500µs), the
AAT3164 enters shutdown mode and draws less
than 1µA from IN. Data register is reset to 0 during
shutdown.
Data
All Outputs D1~D6
1
2
100%
84%
71%
60%
51%
43%
35%
30%
25%
21%
17%
14%
1.8mA
1mA
530µA
50µA
3
4
5
6
7
8
Auto-Disable Feature
9
The AAT3164 is equipped with an auto-disable fea-
ture for each LED channel. After the IC is enabled,
a test current of 150µA (typical) is forced through
each sink channel. The LED must develop a for-
ward voltage of 0.8V for the channel to turn on.
This allows individual channels to be disabled by
connecting the respective sink pin to OUT. This
feature is convenient for disabling an unused chan-
nel or protecting against an LED fail short event.
10
11
12
13
14
15
16
Table 1: Current Level Settings as a
Percentage of the Maximum Level Set by RSET
.
Thermal Protection
The built-in S2Cwire interface records rising edges of
the EN/SET pin and decodes them into these cur-
rent level settings. S2Cwire latches data after the
EN/SET pin has been held high for time TLAT. A sep-
arate mode is available for ultra-low LED current
The AAT3164 has a built-in thermal protection cir-
cuit that will shut down the charge pump if the die
temperature rises above the thermal limit, as is the
case during a short-circuit of the OUT pin.
THI
TOFF
TLO
TLAT
EN/SET
1
2
n - 1
n ≤ 16
1
n
Data Reg
0
Figure 1: S2Cwire Serial Interface Timing Diagram.
3164.2006.07.1.0
9
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
45
40
35
30
25
Applications Information
LED Selection
Although the AAT3164 is specifically designed to
drive white LEDs, the device can also be used to
drive most types of LEDs with forward voltage
specifications ranging from 2.0V to 4.7V. LED
applications may include LCD display backlight-
ing, 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 bright-
ness will be matched regardless 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 (~0.1V
@ 20mA ILED) current sinks in the AAT3164 make
it capable of driving LEDs with forward voltages
as high as 4.7V from an input supply as low as
3.0V. Outputs can be paralleled to drive high-cur-
rent LEDs without complication.
20
15
10
5
0
10 15 20 25 30 35 40 45 50 55 60 65 70 75
RSET (kΩ)
Figure 2: Maximum LED Current vs. RSET
.
Brightness Control Using the RSET Pin
Additional methods of brightness control can be
achieved with the RSET pin. For example, using an
additional resistor to connect the RSET pin with a
digital output provides a HI/LO control. Figure 3
illustrates a configuration of the RSET pin utilizing
two resistors.
AAT3164
Determining the Maximum LED Current
Level
HI/LO
or
VDAC
R2
RSET
The value of RSET determines the maximum LED
current level. In the typical application, selecting
RSET = 26.1kΩ results in 20mA/channel LED cur-
rent. From this reference point, the RSET value
required for other current levels can be calculated
as:
R1
Figure 3: RSET Configuration Using
Two Resistors.
When the digital output is asserted high, the result-
ing brightness level is LO and the individual LED
currents are:
20mA · 26.1kΩ
ILED(MAX)
RSET
=
A visual representation of the maximum LED cur-
rent per channel versus RSET value is shown in
Figure 2.
⎛
⎝
0.6
VIO
⎞
⎠
-
ILED(LO) = 870
R1 // R2 R2
When the digital output is asserted low, the result-
ing brightness level is HI and the individual LED
currents are:
⎛
⎝
0.6
R1 // R2
⎞
⎠
ILED(HI) = 870
10
3164.2006.07.1.0
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
Additionally, a digital-to-analog converter can be
used with the RSET pin to control the brightness
level. The result is like the equation above, where
Due to the very low 1X mode quiescent current, the
input current nearly equals the total output current
delivered to the LEDs. Further, the low resistance
bypass switch introduces negligible voltage drop
from input to output.
VIO is replaced with VDAC
:
The AAT3164 further maintains optimized perform-
ance and efficiency by detecting when the input
voltage is not sufficient to sustain LED drive cur-
rent. The device automatically switches to 1.5X
mode when the input voltage drops too low in rela-
tion to the LED forward voltages.
⎛
0.6
R1 // R2
VDAC
R2
⎞
⎠
-
ILED(LO) = 870
⎝
For cases where PWM dimming is preferred, the
PWM signal can be applied directly to the RSET resis-
tor, as shown in Figure 4. In order for the LED current
to go to zero, the voltage level of the PWM signal
must exceed the RSET pin voltage level of 0.6V.
In 1.5X mode, the output voltage can be boosted to
3/2 the input voltage. The 3/2 conversion ratio
introduces a corresponding 1/2 increase in input
current. For ideal conversion, the 1.5X mode effi-
ciency is given by:
AAT3164
VF · ILED VF
VIN · 1.5IIN 1.5 · VIN
R1
PWM
η =
≈
RSET
Similarly, when the input falls further, such that
1.5X mode can no longer sustain LED drive cur-
rent, the device will automatically switch to 2X
mode. In 2X mode, the output voltage can be
boosted to twice the input voltage. The doubling
conversion ratio introduces a corresponding dou-
bling of the input current. For ideal conversion, the
2X mode efficiency is given by:
Figure 4: RSET Configuration for PWM
Dimming Control.
Device Power Efficiency
The AAT3164 power conversion efficiency
depends on the charge pump mode. By definition,
device efficiency is expressed as the output power
delivered to the LEDs divided by the total input
power consumed.
VF · ILED
VIN · 2IIN
VF
2 · VIN
η =
≈
POUT
PIN
η =
Additional Applications
The current sinks of the AAT3164 can be combined
to drive higher current levels through a single LED.
As an example, each LED of a three-die arrange-
ment can be driven at 80mA each, or 240mA total
(see Figure 5).
When the input voltage is sufficiently greater than
the LED forward voltages, the device optimizes
efficiency by operating in 1X mode. In 1X mode,
the device is working as a bypass switch and pass-
ing the input supply directly to the output. By sim-
plifying the conditions such that the LEDs have uni-
form VF, the power conversion efficiency can be
approximated by:
Other applications that require constant current
can also be accommodated by combining constant
current channels to achieve the necessary current
levels.
VF · ILED
VIN · IIN
VF
VIN
η =
≈
3164.2006.07.1.0
11
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
1µF
1µF
C1+ C1- C2+ C2-
OUT
IN
3 LED pack
VBAT
AAT3164
CIN
1µF
COUT
1µF
GND
80mA
each
D1
D2
D3
D4
D5
EN/SET
EN/SET
RSET
D6
26.1K
Figure 5: Configuration for a Typical Three-LED Application.
low ESR, is lowest cost, has a smaller PCB footprint,
Device Switching Noise Performance
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.
The AAT3164 operates at a fixed frequency of
approximately 1MHz to control noise and limit har-
monics that can interfere with the RF operation of
cellular telephone handsets or other communica-
tion 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 solu-
tions. The AAT3164 soft-start feature prevents
noise transient effects associated with inrush cur-
rents during start-up of the charge pump circuit.
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 compo-
sition, and ambient temperature. Capacitor ESR is
typically measured in milliohms for ceramic capac-
itors and can range to more than several ohms for
tantalum or aluminum electrolytic capacitors.
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 per-
formance. Optimum performance will be obtained
when low equivalent series resistance (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 capacitors. If the LED current
sources are only programmed for light current lev-
els, then the capacitor value may be decreased.
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 dielec-
tric 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 AAT3164 applications.
Capacitor Characteristics
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.
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use with
the AAT3164. Ceramic capacitors offer many advan-
tages over their tantalum and aluminum electrolytic
counterparts. A ceramic capacitor typically has very
12
3164.2006.07.1.0
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
AAT3164IRN-T1
TDFN34-16
QBXYY
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/pbfree.
Package Information
TDFN34-16
Detail "B"
Index Area
(D/2 x E/2)
0.35 0.10
0.20 MIN
0.075 0.075
Detail "A"
3.00 0.05
Pin 1 Indicator
(optional)
Top View
Bottom View
7.5° 7.5°
Detail "B"
0.05
0.229 0.051
0.05
Option A:
Option B:
C0.30 (4x) max
Chamfered corner
R0.30 (4x) max
Round corner
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.
3164.2006.07.1.0
13
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
© 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.
Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold sub-
ject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech
warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality con-
trol 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 regis-
tered trademarks or trademarks of their respective holders.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
14
3164.2006.07.1.0
相关型号：
©2020 ICPDF网 联系我们和版权申明