AAT3166IWP-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
AAT3166IWP-T1
型号: AAT3166IWP-T1
厂家: ADVANCED ANALOGIC TECHNOLOGIES    ADVANCED ANALOGIC TECHNOLOGIES
描述:

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

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AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
ChargePump  
General Description  
Features  
The AAT3166 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 AAT3166 is capable of  
driving four LEDs for a total of 108mA 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  
— 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 Four LEDs  
Individual Main-Sub (3-1) Group Control  
No Inductors, Low Noise Operation  
1MHz Constant Switching Frequency  
Small Application Circuit  
AnalogicTech's AS2Cwire™ (Advanced Simple Serial  
Control™) serial digital input is used to enable, dis-  
able, 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 set-  
tings require only 50µA of housekeeping current.  
Built-In Thermal Protection  
Built-In Auto-Disable for Open Circuit  
Automatic Soft Start  
IQ <1uA in Shutdown  
TDFN33-12 Package  
Each output of the AAT3166 is equipped with built-  
in protection for output short-circuit and auto-dis-  
able for load short-circuit condition. Built-in soft-  
start circuitry prevents excessive inrush current  
during start-up. A low-current shutdown feature dis-  
connects the load from the input and reduces qui-  
escent current to less than 1µA.  
Applications  
Color (RGB) Lighting  
Programmable Current Sink  
Transmissive LCD Display  
White LED Backlighting  
The AAT3166 is available in a Pb-free, space sav-  
ing, 3×3mm TDFN33-12 package and is rated over  
the -40°C to +85°C temperature range.  
White Photo Flash for Digital Still Cameras  
Typical Application  
C1+  
C2+  
C1  
1μF  
C2  
1μF  
C2-  
C1-  
IN  
OUTCP  
2.7V to 5.5V  
COUT  
1μF  
D1  
D2  
D3  
D4  
CIN  
1μF  
AAT3166  
GND  
D1  
D2  
D3  
D4  
EN/SET  
EN/SET  
3166.2006.05.1.2  
1
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
Pin Descriptions  
Pin #  
Symbol  
Function  
1
2
3
4
5
D4  
EN/SET  
C1+  
Current sink input #4.  
AS2Cwire serial interface control pin.  
Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.  
Flying capacitor 1 negative terminal.  
C1-  
OUTCP  
Charge pump output to drive load circuit. Requires 1µF capacitor connected between this  
pin and ground.  
6
7
C2+  
C2-  
IN  
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.  
Flying capacitor 2 negative terminal.  
8
Input power supply. Requires 1µF capacitor connected between this pin and ground.  
Ground.  
9
GND  
D1  
10  
11  
12  
EP  
Current sink input #1.  
D2  
Current sink input #2.  
D3  
Current sink input #3.  
Exposed paddle; connect to ground as closely as possible to package.  
Pin Configuration  
TDFN33-12  
(Top View)  
1
2
3
4
5
6
12  
11  
10  
9
D4  
EN/SET  
C1+  
D3  
D2  
D1  
C1-  
GND  
IN  
8
OUTCP  
C2+  
7
C2-  
2
3166.2006.05.1.2  
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
Absolute Maximum Ratings1  
Symbol  
Description  
Value  
Units  
VIN  
Input Voltage to GND  
-0.3 to 6  
-0.3 to VIN + 0.3  
150  
V
V
VEN/SET  
EN/SET Voltage to GND  
2
IOUT  
Maximum DC Output Current  
mA  
°C  
°C  
TJ  
Operating Junction Temperature Range  
Maximum Soldering Temperature (at leads, 10 sec)  
-40 to 150  
300  
TLEAD  
Thermal Information3  
Symbol  
Description  
Value  
Units  
PD  
Maximum Power Dissipation4  
2.0  
50  
W
θJA  
Maximum Thermal Resistance  
°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.  
3166.2006.05.1.2  
3
AAT3166  
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  
2X Mode, 3.0 VIN 5.5, Active,  
No Load Current, High Current Mode  
1X Mode, 3.0 VIN 5.5, Active,  
No Load Current, Low Current Mode  
VEN/SET = 0V  
0.3  
1
mA  
ICC  
Operating Current  
1
50  
µA  
ISHDN  
IDX  
Shutdown Current  
1
µA  
%
%
%
High Current Accuracy  
Low Current Accuracy  
Current Matching2  
ISET = 18mA, TA = 25°C  
-10  
10  
ISET = 400µA, TA = 25°C  
15  
I(D-Match)  
VTH  
VF:D1:D4 = 3.6V  
0.5  
1
1X to 1.5X or 1.5X to 2X Transition  
Threshold at Any ISINK Pin  
150  
mV  
Charge Pump Section  
TSS  
FCLK  
Soft-Start Time  
100  
µs  
Clock Frequency  
1000  
kHz  
EN/SET  
VEN(L)  
Enable Threshold Low  
Enable Threshold High  
EN/SET Low Time  
VIN = 2.7V  
VIN = 5.5V  
0.4  
75  
V
V
VEN(H)  
1.4  
0.3  
TEN/SET LO  
µs  
ns  
µs  
µs  
µs  
µA  
TEN/SET  
Minimum EN/SET High Time  
Maximum EN/SET High Time  
EN/SET Off Timeout  
50  
_
_
HI MIN  
TEN/SET  
75  
500  
500  
1
_
_
HI MAX  
TOFF  
TLAT  
EN/SET Latch Timeout  
EN/SET Input Leakage  
IEN/SET  
-1  
1. The AAT3166 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
3166.2006.05.1.2  
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
Typical Characteristics  
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C.  
Efficiency vs. Supply Voltage  
Turn-On to 1X Mode  
(VIN = 4.2V; 18mA Load)  
100  
18mA  
F = 3.4V  
90  
V
EN  
(2V/div)  
80  
70  
60  
50  
40  
30  
20  
10  
0
VOUT  
(2V/div)  
VSINK  
(500mV/div)  
5.1mA  
F = 3.0V  
V
350μA  
F = 2.7V  
IIN  
(200mA/div)  
V
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)  
100μμs/div  
Turn-On to 1.5X Mode  
(VIN = 3.5V; 18mA Load)  
Turn-On to 2X Mode  
(VIN = 2.8V; 18mA Load)  
EN  
(2V/div)  
EN  
(2V/div)  
VOUT  
(2V/div)  
VOUT  
(2V/div)  
VSINK  
(500mV/div)  
VSINK  
(500mV/div)  
IIN  
(200mA/div)  
IIN  
(200mA/div)  
100μs/div  
100μs/div  
Turn-Off from 1.5X Mode  
(VIN = 3.5V; 18mA Load)  
Current Matching vs. Temperature  
19.0  
18.8  
18.6  
18.4  
18.2  
18.0  
17.8  
17.6  
17.4  
17.2  
17.0  
EN  
(2V/div)  
Channel 2  
VF  
(1V/div)  
Channel 3  
Channel 4  
Channel 1  
IIN  
(100mA/div)  
-40  
-20  
0
20  
40  
60  
80  
100μs/div  
Temperature (°C)  
3166.2006.05.1.2  
5
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
Typical Characteristics  
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C.  
Load Characteristics  
(VIN = 3.8V; 1.5X Mode; 18mA Load)  
Load Characteristics  
(VIN = 2.8V; 2X Mode; 18mA Load)  
VIN  
(40mV/div)  
VIN  
(40mV/div)  
VOUT  
(40mV/div)  
VOUT  
(40mV/div)  
VSINK  
(40mV/div)  
VSINK  
(40mV/div)  
500ns/div  
500ns/div  
Load Characteristics  
(VIN = 4.1V; 1.5X Mode; 27mA Load)  
Load Characteristics  
(VIN = 3.2V; 2X Mode; 27mA Load)  
VIN  
(40mV/div)  
VIN  
(40mV/div)  
VOUT  
(40mV/div)  
VOUT  
(40mV/div)  
VSINK  
(40mV/div)  
VSINK  
(40mV/div)  
500ns/div  
500ns/div  
Input Ripple vs. Input Voltage  
12  
10  
8
27mA  
18mA  
6
4
14mA  
2
0
2.5  
2.7  
2.9  
3.1  
3.3  
3.5  
3.7  
3.9  
4.1  
4.3  
4.5  
Input Voltage (V)  
6
3166.2006.05.1.2  
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
Typical Characteristics  
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C.  
EN/SET Latch Timeout vs. Input Voltage  
EN/SET Off Timeout vs. Input Voltage  
400  
350  
300  
250  
200  
150  
100  
50  
350  
300  
250  
200  
150  
100  
50  
-40°C  
-40°C  
25°C  
85°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  
Input Voltage (V)  
Input Voltage (V)  
Enable Threshold High vs. Input Voltage  
Enable Threshold Low vs. Input Voltage  
1.2  
1.1  
1
1.2  
1.1  
1
-40°C  
0.9  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.9  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
-40°C  
25°C  
85°C  
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  
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  
Input Voltage (V)  
Input Voltage (V)  
3166.2006.05.1.2  
7
AAT3166  
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  
D/A  
D/A  
D/A  
D1  
6 x 16 Bit  
ROM  
D2  
D3  
AS2Cwire  
Interface  
EN/SET  
6 x 16 Bit  
ROM  
D/A  
D4  
GND  
capacitors (C1 and C2), one 1µF ceramic input  
capacitor (CIN), and one 0.33µF to 1µF ceramic  
charge pump output capacitor (COUT).  
Functional Description  
The AAT3166 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 AAT3166  
charge pump is enabled when any of the four cur-  
rent sink inputs near dropout. The charge pump  
initially starts in 1.5X mode. If the charge pump  
output drops enough for any current source output  
to become close to dropout, the charge pump will  
automatically transition to 2X mode. The AAT3166  
requires only four external components: two 1µF  
ceramic capacitors for the charge pump flying  
The four constant current sink inputs (D1 to D4)  
can drive four individual LEDs with a maximum cur-  
rent 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 enables the AAT3166  
and sets the current sink magnitudes. AS2Cwire  
addressing allows independent control of two  
groups of current sink input: D1~D3 and D4.  
Constant Current Output Level Settings  
The constant current sink levels for D1 to D4 are  
set via the serial interface according to a logarith-  
mic scale where each code is approximately 1.8dB  
lower than the previous code. In this manner, LED  
8
3166.2006.05.1.2  
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
AS2Cwire Serial Interface  
brightness appears linear with each increasing  
code count. Because the inputs D1 to D4 are true  
independent constant current sinks, the voltage  
observed on any single given input will be deter-  
mined by the actual forward voltage (VF) for the  
LED being driven.  
The current sink input magnitude of the AAT3166 is  
controlled 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 capable of controlling only a  
single register. The AAT3166 has four registers:  
Bank1, Bank2, Max Current, and Low Current.  
Since the input current sinks of the AAT3166 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 AAT3166 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.  
Three addresses are used to control the two regis-  
ters. Address 0 addresses both registers simultane-  
ously to allow the loading of both registers with the  
same data using a single write protocol. Address 1  
addresses Register 1 for D1 to D3 current level set-  
tings. Address 2 addresses Register 2 for D4 cur-  
rent 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 ris-  
ing 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 signify-  
ing 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 regis-  
ter are allowed. Address 0 is the default address  
on the first rising edge after the AAT3166 has been  
disabled. If data is presented on the first rising  
edge with no prior address, both data registers are  
simultaneously loaded.  
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.  
27mA Max 18mA Max 14mA Max  
Data  
IOUT (mA)  
IOUT (mA)  
IOUT (mA)  
1
2
27  
22  
18  
14  
12  
10  
8
18  
15  
14  
11  
3
12  
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
4
10  
5
7.9  
6.3  
5.1  
4.1  
3.5  
2.9  
2.2  
1.9  
1.6  
1.3  
1.0  
0
6
7
8
6.2  
5.2  
4.3  
3.3  
2.9  
2.4  
1.9  
1.4  
0
9
10  
11  
12  
13  
14  
15  
16  
The maximum current level is determined by the  
value set in Register 3, the Max Current register.  
Three scales are available for high operating cur-  
rents with maximum current levels of 27mA, 18mA,  
or 14mA. Each scale maintains approximately  
1.8dB steps between settings. A separate mode is  
Table 1: Current Level Settings.  
3166.2006.05.1.2  
9
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
available for ultra-low LED current operation.  
When the Max Current register (Register 3) is set  
to the Low Current setting, the Low Current regis-  
ter (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 multi-  
ple channels or 50µA for Channel 4 operation only.  
Both banks of current sinks must be in the same  
high or low current mode of operation.  
Low Current Register (Address 4)  
Main Low  
Sub Low  
Data  
Current On Current On Current  
1
2
No  
No  
No  
No  
3
No  
No  
4
No  
No  
5
No  
Yes  
Yes  
Yes  
Yes  
No  
115µA  
175µA  
280µA  
400µA  
115µA  
175µA  
280µA  
400µA  
115µA  
175µA  
280µA  
400µA  
6
No  
7
No  
8
No  
9
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
10  
11  
12  
13  
14  
15  
16  
No  
No  
When EN/SET is held low for an amount of time  
greater than TOFF, the AAT3166 enters shutdown  
mode and draws less than 1µA from VIN. Data and  
Address registers are reset to 0 during shutdown.  
No  
Yes  
Yes  
Yes  
Yes  
AS2Cwire Serial Interface Addressing  
Auto-Disable Feature  
EN/SET  
Address Rising Edges  
Data Register  
AAT3166  
The AAT3166 is equipped with an auto-disable fea-  
ture 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.  
0
1
2
3
4
17  
18  
19  
20  
21  
1&2: D1~D4 Current  
1: D1~D3 Current  
2: D4 Current  
3: Max Current  
4: Low Current  
Data  
Max Current  
1
2
3
4
18mA  
27mA  
Thermal Protection  
The AAT3166 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 would  
be the case during a short circuit of the OUTCP pin.  
14mA  
Low Current  
(see Low Current Register for values)  
10  
3166.2006.05.1.2  
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
AS2Cwire Serial Interface Timing  
Address  
Data  
THI  
TLAT  
TLO  
TLAT  
EN/SET  
Address  
1
2
17  
18  
1
2 . . .  
n <= 16  
0
1
0
0
n - 1  
Data Reg 1  
Data Reg 2  
Device Switching Noise Performance  
Applications Information  
The AAT3166 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 AAT3166 soft-start feature prevents  
noise transient effects associated with inrush cur-  
rents during start-up of the charge pump circuit.  
LED Selection  
Although the AAT3166 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 (IR) diodes for remotes, and other  
loads benefiting from a controlled output current  
generated from a varying input voltage. Since the  
D1 to D4 input current sinks are matched with neg-  
ligible voltage dependence, the LED brightness will  
be matched regardless of the specific LED forward  
voltage (VF) levels.  
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 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 programmed only for light current lev-  
els, then the capacitor size may be decreased.  
In some instances (e.g., in high-luminous-output  
applications such as photo flash), it may be neces-  
sary to drive high-VF type LEDs. The low-dropout  
current sinks in the AAT3166 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.  
3166.2006.05.1.2  
11  
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
Capacitor Characteristics  
Ceramic Capacitor Materials  
Ceramic composition capacitors are highly recom-  
mended over all other types of capacitors for use  
with the AAT3166. Ceramic capacitors offer many  
advantages over their tantalum and aluminum elec-  
trolytic counterparts. A ceramic capacitor typically  
has very low ESR, is lowest cost, has a smaller  
PCB footprint, and is non-polarized. Low ESR  
ceramic capacitors help maximize charge pump  
transient response. Since ceramic capacitors are  
non-polarized, they are not prone to incorrect con-  
nection damage.  
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 val-  
ues 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  
AAT3166 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.  
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 con-  
nections, 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.  
12  
3166.2006.05.1.2  
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for White LED Applications  
Ordering Information  
Package  
Marking1  
Part Number (Tape and Reel)2  
AAT3166IWP-T1  
TDFN33-12  
PXXYY  
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  
TDFN33-12  
Index Area  
(D/2 x E/2)  
Detail "B"  
0.3 0.10 0.16 0.375 0.125  
0.075 0.075  
0.1 REF  
3.00 0.05  
1.70 0.05  
Detail "A"  
Top View  
Bottom View  
Pin 1 Indicator  
(optional)  
7.5° 7.5°  
Detail "B"  
Option A:  
Option B:  
C0.30 (4x) max  
Chamfered corner  
R0.30 (4x) max  
Round corner  
0.05 0.05  
Detail "A"  
Side View  
All dimensions in millimeters.  
1. XYY = assembly and date code.  
2. Sample stock is generally held on part numbers listed in BOLD.  
3166.2006.05.1.2  
13  
AAT3166  
High Efficiency 1X/1.5X/2X Charge  
Pump for 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  
3166.2006.05.1.2  

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