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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Features
* Input Supply Voltage Range: 2.7V to 5.5V * Tri-Mode (1X/1.5X/2X) Charge Pump * Maximizes Efficiency * 1MHz Constant Switching Frequency * No Inductors, Low Noise Operation * Drives Four Channels of LEDs up to 40mA/ Channel * User-Programmable LED Current * Excellent LED Channel-to-Channel Current Matching * Digitally Programmable LED Current with Single-Wire S2Cwire Interface * 16 Current Levels From 40mA to 50A * Low IQ (50A) for Low Current Mode Operation * True Load Disconnect in Shutdown; IQ < 1A * Built-In Thermal Protection * Built-In Auto-Disable for Open LED Circuit * Automatic Soft-Start Minimizes Inrush Startup Current * 2.85x3x1mm TSOPJW-14 Package
General Description
The AAT3159 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 device is capable of driving up to four channels of LEDs at up to 40mA per channel from a 2.7V to 5.5V input supply voltage. The current sinks may be operated individually or in parallel for driving higher-current LEDs. A low external parts count (two 1F flying capacitors [C1 and C2] and two small 1F capacitors [CIN and COUT]) makes this part ideally suited for small battery-powered applications. AnalogicTech's patented single-wire Simple Serial ControlTM (S2CwireTM) serial digital interface is used to enable, disable, and set the current for each LED with 16 levels from a maximum of 40mA down to 50A. The maximum current level is programmed via an external resistor. To save power, low-current mode supply current will be as low as 50A. Each output of the AAT3159 is equipped with built- in protection for VOUT short-circuit operation and auto-disable functionality for LED open-circuit conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from IN and reduces quiescent current to less than 1A. The AAT3159 is available in a Pb-free, space-saving 2.85x3x1mm TSOPJW-14 package.
Applications
* * * * Cellphones, DSC, Handheld Devices LED Photo Flash Programmable Current Sinks White LED Backlighting
Typical Application
C1 1F VBATTERY 3.6V CIN 1F
C1+ C2+
C2 1F
C1IN
C2OUT
WLEDs OSRAM LW M67C or equivalent
AAT3159
GND D1
D1
D2
D3
D4
COUT 1F
EN/SET S Cwire Serial Control
2
EN/SET SET
D2 D3 D4
RSET 26.1k
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Pin Descriptions
Pin #
1 2 3 4 5 6 7 8 9, 11 10 12 13 14
Symbol
D4 SET EN/SET C1+ C1OUT C2+ C2GND IN D1 D2 D3
Function
Current sink input #4. Connect to the cathode of LED4. If not used, connect LED current setting resistor input/connection. S2Cwire serial interface control input for LED current magnitude control. Positive terminal of charge pump capacitor 1. Negative terminal of charge pump capacitor 1. Charge pump output. Connect all LED anodes to OUT. Positive terminal of charge pump capacitor 2. Negative terminal of charge pump capacitor 2. Ground. Input power supply connection. Current sink input #1. Connect to the cathode of LED1. If not used, connect Current sink input #2. Connect to the cathode of LED2. If not used, connect Current sink input #3. Connect to the cathode of LED3. If not used, connect D4 to the OUT pin.
D1 to the OUT pin. D2 to the OUT pin. D3 to the OUT pin.
Pin Configuration
TSOPJW-14 (Top View)
D4 SET EN/SET C1+ C1OUT C2+
1 2 3 4 5 6 7
14 13 12 11 10 9 8
D3 D2 D1 GND IN GND C2-
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3159.2007.10.1.0
PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Absolute Maximum Ratings1
Symbol
VN VN VN TJ TLEAD
Description
[IN, OUT, D1, D2, D3, D4] to GND [C1-, C2-, EN/SET, SET] to GND [C1+, C2+] to GND Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6 -0.3 to VIN + 0.3 -0.3 to VOUT + 0.3 -40 to 150 300
Units
V V V C C
Thermal Information2
Symbol
PD JA
Description
Maximum Power Dissipation3 Maximum Thermal Resistance
Value
0.625 160
Units
W 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. Mounted on a FR4 board. 3. Derate 6.25mW/C above 25C.
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Electrical Characteristics1
VIN = 3.6V; CIN = COUT = C1 = C2 = 1.0F; TA = -40C to +85C, unless otherwise noted. TA = 25C. Symbol Description Conditions Min
2.7 1X Mode, 3.0 VIN 5.5, Active, No Load Current 1.5X Mode, 3.0 VIN 5.5, Active, No Load Current 2X Mode, 3.0 VIN 5.5, Active, No Load Current 50A Setting, 1X Mode EN/SET = 0 TA= -40C to +85C, RSET = 26.1k, Data = 1 (100%) VF:D1:D4 = 3.6V 0.3 1 1 50 18 20 0.5 150 ISINK/IRSET 870 0.6 100 1000 VIN = 2.7V VIN = 5.5V 0.4 1.4 0.3 50 75 500 500 1 75
Typical values are
Typ
Max
5.5 1 3
Units
V mA A A mA % mV A/A V s kHz V V s ns s s s A
Input Power Supply VIN Input Supply Voltage Range ICC ISHDN IDX I(D-Match) Operating Input Current Shutdown Current DX Pin Current
2
1 22 1
Current Matching 1X to 1.5X or 1.5X to 2X TranVTH sition Threshold at Any DX Pin ISET Current Set Ratio VSET SET Pin Voltage Charge Pump Section TSS Soft-Start Time FCLK Clock Frequency EN/SET Logic Control VIL(EN/SET) Enable Logic Low Threshold VIH(EN/SET) Enable Logic High Threshold EN/SET Low Time TEN/SET LO 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
-1
1. The AAT3159 is guaranteed to meet performance specifications over the -40C to +85C 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.
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Typical Characteristics
VIN = 3.6V; CIN = COUT = C1 = C2 = 1.0F; TA = -40C to +85C, unless otherwise noted. TA = 25C. Typical values are
Efficiency vs. Input Voltage
100 90 6mA/channel VF = 3V 20mA/channel VF = 3.4V
Turn-On to 1X Mode
(VIN = 4.2V; 20mA/Channel Load)
Efficiency (%)
80 70 60 50 40 30 2.7 2.9 3.1 3.3 500A/channel VF = 2.7V
VEN/SET (1V/div) VOUT (2V/div) VDX (1V/div) IIN (100mA/div) Time (100s/div)
3.5
3.7
3.9
4.1
4.3
4.5
Input Voltage (V)
Turn-On to 1.5X Mode
(VIN = 3.5V; 20mA/Channel Load)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA/Channel Load)
VEN/SET (1V/div) VOUT (4V/div) VDX (1V/div) IIN (200mA/div) Time (100s/div)
VEN/SET (1V/div) VOUT (4V/div) VDX (500mV/div) IIN (500mA/div) Time (100s/div)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA/Channel Load)
22.0 21.5
LED Current vs. Temperature
(20mA/Channel)
VEN/SET (1V/div) VF (4V/div) IIN (100mA/div)
LED Current (mA)
21.0 20.5 20.0 19.5 19.0 18.5 18.0 -40 -15 10
ID1
ID4 ID2 ID3
35
60
85
Time (100s/div)
Temperature (C)
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Typical Characteristics
VIN = 3.6V; CIN = COUT = C1 = C2 = 1.0F; TA = -40C to +85C, unless otherwise noted. TA = 25C. Typical values are
Operating Characteristics
(VIN = 3.7V; 1.5X Mode; 20mA/Channel Load; AC Coupled) VIN (20mV/div) VOUT (40mV/div) VDX (20mV/div) VIN (20mV/div) VOUT (40mV/div) VDX (20mV/div)
Operating Characteristics
(VIN = 3.5V; 1.5X Mode; 14mA/Channel Load; AC Coupled)
Time (500ns/div)
Time (500ns/div)
Operating Characteristics
(VIN = 2.9V; 2X Mode; 20mA/Channel Load; AC Coupled) VIN (20mV/div) VOUT (40mV/div) VDX (40mV/div) VIN (20mV/div) VOUT (40mV/div) VDX (40mV/div)
Operating Characteristics
(VIN = 2.9V; 2X Mode; 14mA/Channel Load; AC Coupled)
Time (500ns/div)
Time (500ns/div)
Input Ripple vs. Input Voltage
14.0 12.0
20mA/channel 14mA/channel
Input Ripple (mV)
10.0 8.0 6.0 4.0 2.0 0.0 2.7
10mA/ channel
3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
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3159.2007.10.1.0
PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Typical Characteristics
VIN = 3.6V; CIN = COUT = C1 = C2 = 1.0F; TA = -40C to +85C, unless otherwise noted. TA = 25C. Typical values are
EN/SET Latch Timeout vs. Input Voltage
EN/SET Latch Timeout (s)
350 350
EN/SET Off Timeout vs. Input Voltage
EN/SET Off Timeout (s)
300 250 200 150 100 50 0 2.7 3.1 3.5
300 250 200 150 100 50 0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
-40C
-40C
25C
85C
25C
3.9 4.3
85C
4.7 5.1 5.5
Input Voltage (V)
Input Voltage (V)
EN/SET Logic High Threshold (V)
EN/SET High Threshold Voltage vs. Input Voltage
EN/SET Logic Low Threshold (V)
1.4 1.2 1.0 0.8 0.6 0.4 2.7 1.4 1.2 1.0 0.8 0.6 0.4
EN/SET Low Threshold Voltage vs. Input Voltage
-40C
-40C
25C
85C
25C
2.7 3.1 3.5 3.9 4.3
85C
4.7 5.1 5.5
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Functional Block Diagram
C1+ C1- C2+ C2-
IN
1x, 1.5x and 2x Charge Pump
OUT
Soft Start Control 1MHz Oscillator Voltage Reference D/A D/A 6x16 bit ROM D/A D/A Max Current Adjustment
D1 D2 D3 D4
EN/SET
S2Cwire Interface
GND (2)
SET
ceramic input capacitor (CIN), and one 0.33F to 1F ceramic output capacitor (COUT). The four constant current sink inputs (D1 to D4) can drive four individual LEDs with a maximum current of 40mA each. The unused sink inputs must be connected to VOUT; otherwise, the part will operate only in 2X charge pump mode. The S2Cwire serial interface enables the AAT3159 and sets the LED current magnitudes.
Functional Description
The AAT3159 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 AAT3159 charge pump is enabled when any of the four current sink inputs nears 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 AAT3159 requires only four external components: two 1F ceramic capacitors for the charge pump flying capacitors (C1 and C2), one 1F
Constant Current Output Level Settings
The LED current magnitude is controlled by AnalogicTech's S2Cwire serial digital interface. The maximum current is programmed by an external resistor at the SET pin. Since the current sinks are programmable, no PWM (pulse width modulation) or additional control circuitry is needed to control LED brightness. This feature greatly
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
The S2Cwire serial interface has flexible timing. Data can be clocked-in at speeds greater than 1MHz, or much slower, such as 15kHz. After data is submitted, EN/SET is held high to latch the data. Once EN/SET has been held in the logic high state longer than TLAT (500s), the programmed current becomes active. For subsequent current level programming, the number of rising edges corresponding to the desired code must be entered on the EN/SET pin. When EN/SET is held logic low longer than TOFF (500s), the AAT3159 enters into shutdown mode and draws less than 1A from IN. The internal data register is reset to zero during shutdown. 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 LED current 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 code settings for the AAT3159 are listed in Table 1.
S2Cwire Serial Interface
The current level magnitude is controlled by AnalogicTech's Simple Serial Control (S2Cwire) serial interface. The interface records rising edges of the EN/SET pin and decodes them into 16 different states. The 16 current level settings available are indicated in Table 1. Data
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Auto-Disable Feature
The AAT3159 is equipped with an auto-disable feature for each LED channel. After the IC is enabled and started up, a test current of 100A (typical) is forced through each sink channel. The channel will be disabled if the voltage of that particular current sink (DX pin) does not drop to a specific threshold. This feature is very convenient for disabling an unused channel or during an LED fail short event.
All LED Outputs D1 - D4
100% 90% 79% 70% 62% 55% 48% 40% 31% 21% 15% 11% 1mA 500A 100A 50A
Thermal Protection
The AAT3159 has built-in thermal protection circuit that will shut down the charge pump if the die temperature rises above the thermal limit, as is the case during a short-circuit event with the OUT pin.
Table 1: AAT3159 LED Current Levels as a Percentage of the Maximum Level Set by RSET.
S2Cwire Serial Interface Timing
T HI T LO TLAT TOFF
EN/SET
1 2 n n <= 16
Data Reg
1
n
0
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
45 40 35 30
Applications Information
LED Selection
Although the AAT3159 is specifically intended for driving 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 main and sub-LCD display backlighting, camera photoflash 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 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 AAT3159 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.
ID (mA)
25 20 15 10 5 0 10 15 20 25 30 35 40 45 50 55 60 65 70 75
RSET (k)
Figure 1: Maximum LED Current vs. RSET.
AAT3159
HI/LO or VDAC R2 SET R1
Determining the Maximum LED Current Level
The value of RSET determines the maximum LED current level. In the typical application, selecting RSET = 26.1k results in 20mA/channel LED current. From this reference point, the RSET value required for other current levels can be calculated as:
Figure 2: SET Pin Configuration Using Two Resistors. When the digital output is asserted high, the resulting brightness level is LO and the individual LED currents are:
RSET =
20mA * 26.1k ILED(MAX)
A visual representation of the maximum LED current per channel versus RSET value is shown in Figure 1. Since the AAT3159's LED current control circuits were optimzed for full-scale current settings higher than 15mA, RSET values smaller than or equal to 33.2k are recommended.
0.6V VIO ILED(LO) = ISET R // R - R 1 2 2
When the digital output is asserted low, the resulting brightness level is HI and the individual LED currents are:
Brightness Control Using the SET Pin
Additional methods of brightness control can be achieved with the SET pin. For example, using an additional resistor to connect the SET pin with a digital output provides a HI/LO control. Figure 2 illustrates a configuration of the SET pin utilizing two resistors.
0.6V ILED(HI) = ISET R // R 1 2
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
= 4 * VLEDX * ILEDX ; x = 1, 2, 3 or 4 and IIN = 4 * ILEDX VIN * IIN
Additionally, a digital-to-analog converter can be used with the SET pin to control the brightness level. The result is like the equation above, where VIO is replaced with VDAC:
VLEDX = V IN
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 a negligible voltage drop from input to output. The AAT3159 further maintains optimized performance and efficiency by detecting when the input voltage is not sufficient to sustain the LED bias current. The device automatically switches to 1.5X mode when the input voltage drops too low in relation to the LED forward voltages. In 1.5X mode, the output voltage can be boosted to 1.5X the input voltage. The 1.5X conversion ratio introduces a corresponding 0.5X increase in input current. For ideal conversion, the 1.5X mode efficiency is given by:
0.6V VDAC ILED(LO) = ISET R // R - R 1 2 2
For cases where PWM dimming is preferred, the PWM signal can be applied directly to the SET resistor, as shown in Figure 3. In order for the LED current to go to zero, the voltage level of the PWM signal must be higher than the SET pin voltage of 0.6V.
AAT3159
PWM R1 SET
=
Figure 3: SET Pin Configuration for PWM Dimming Control.
PLEDs VLED1 * ILED1 + ... + VLED4 * ILED4 = PIN VIN * IIN
=
4 * VLEDX * ILEDX ; x = 1, 2, 3 or 4 and IIN = 1.5(4 * ILEDX) VIN * IIN
IN
Device Power Efficiency
The AAT3159's power conversion efficiency depends on the charge pump mode of operation. By definition, device efficiency is expressed as the output power delivered to the LEDs divided by the total input power consumed.
VLEDX = 1.5V
=
PLEDs VLED1 * ILED1 + ... + VLED4 * ILED4 = PIN VIN * IIN
Similarly, when the input falls further, such that 1.5X mode can no longer sustain the LED bias currents, the AAT3159 will automatically switch to 2X mode. In 2X mode, the output voltage can be boosted to 2X the input voltage. The 2X conversion ratio introduces a corresponding 1X increase in input current. For ideal conversion, the 2X mode efficiency is given by:
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 passing the input supply directly to the output. By simplifying the conditions such that the LEDs have uniform VF, the power conversion efficiency can be approximated by:
= =
PLEDs VLED1 * ILED1 + ... + VLED4 * ILED4 = PIN VIN * IIN
4 * VLEDX * ILEDX ; x = 1, 2, 3 or 4 and IIN = 2(4 * ILEDX) VIN * IIN
VLEDX = 2V IN
=
PLEDs VLED1 * ILED1 + ... + VLED4 * ILED4 = PIN VIN * IIN
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
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.
Device Switching Noise Performance
The AAT3159 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 AAT3159 soft-start feature prevents noise transient effects associated with inrush currents during start-up of the charge pump circuit.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1F are typically made from NPO or C0G materials. NPO and C0G materials typically have tight tolerance and are stable over temperature. Larger capacitor values are typically composed of X7R, X5R, Z5U, or Y5V dielectric materials. Large ceramic capacitors, typically greater than 2.2F, are often available in low-cost Y5V and Z5U dielectrics, but capacitors greater than 1F are typically not required for AAT3159 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.
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) ceramic capacitors are used; in general, low ESR may be defined as less than 100m. A value of 1F for all four capacitors is a good starting point when choosing capacitors. If the LED current sources are only programmed 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 AAT3159. 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.
PCB Layout
To achieve adequate electrical and thermal performance, careful attention must be given to the printed circuit board (PCB) layout of the AAT3159. Figures 5 and 6 illustrate an example PCB layout for the AAT3159 (evaluation board). The flying capacitors (C1 and C2), input capacitor (C4), and output capacitor (C3) should be connected as close as possible to the IC. In addition to the external passive components being placed as close as possible to the IC, all traces connecting the AAT3159 should be as short and wide as possible to minimize path resistance and potential coupling.
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Evaluation Board Schematic
DCTP1 DCDC+ TP2 DC+ ON OFF GND JP6 J1 R1 24.9K C1 1F
1 2 3 4 5 6 7
TP3 GND
TP4 GND
GND VIN
U1 D4 SET EN/SET C1+ C1VOUT C2+ AAT3159 C2 1F D3 D2 D1 GND VIN GND C214 13 12 11 10 9 8
GND
C3 1F GND JP5
C4 1F GND
JP1 D1 WHITE
JP2 D2 WHITE
JP3 D3 WHITE
JP4 D4 WHITE
ON OFF J2
R8 220
R7 100K GND VIN R4 1K CYCLE UP SW3 SW2 SW1 R3 1K R2 1K U2
1 2 3 4
VDD GP5 GP4 GP3 PIC12F675
VSS 7 GP0 6 GP1 5 GP2 R5 330 LED0 GREEN GND
8
VR1 10K-POT
C5 1F
R6 330 LED7 RED GND
GND
DOWN
GND
Figure 4: AAT3159 Evaluation Board Schematic.
Evaluation Board Layout
Figure 5: AAT3159 Evaluation Board Top Side Layout.
Figure 6: AAT3159 Evaluation Board Bottom Side Layout.
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Ordering Information
Package
TSOPJW-14
Marking1
TLXYY
Part Number (Tape and Reel)2
AAT3159ITO-T1
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
TSOPJW-14
0.20 + 0.10 - 0.05
2.40 0.10 0.40 BSC
Top View
0.04 REF 3.05 + 0.05 - 0.10
+ 0.000 1.00 - 0.075
2.85 0.20
+ 0.05 1.05 - 0.00
0.05 + 0.05 - 0.04
4 4 2.75 0.25
0.15 0.05
0.45 0.15
Side View
All dimensions in millimeters.
End View
1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.
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PRODUCT DATASHEET
AAT3159
ChargePumpTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611
(c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech's terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
3159.2007.10.1.0
www.analogictech.com
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