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PRODUCT DATASHEET
AAT3104178
ChargePumpTM
General Description
The AAT3104 is a charge-pump based, current-source white LED driver capable of driving one to four LEDs up to 30mA, each. It automatically switches between 1x mode and 2x mode to maintain the highest efficiency and optimal LED current accuracy and matching. The AAT3104 charge pump's 1x mode (bypass mode) has very low resistance allowing LED current regulation to be maintained with input supply voltage approaching the LED forward voltage. LED brightness is controlled using AnalogicTech's patented S2CwireTM single wire interface. The AAT3104 is available in a 2x2mm 10-lead SC70JW-10 package.
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Features
* * * * * Drives up to 4 LEDs at up to 31mA each Automatic Switching Between 1x and 2x Modes 1MHz Switching Frequency Linear LED Output Current Control Single-wire, S2Cwire Interface AAT3104-1: 16-step AAT3104-2: 32-step 10% LED Output Current Accuracy 3% LED Output Current Matching Low-current Shutdown Mode Built-in Thermal Protection Automatic Soft-start Available in 2x2mm SC70JW-10 Package
* * * * * *
Applications
* * * * Cordless Phone Handsets Digital Cameras Mobile Phone Handsets MP3 and PMP Players
Typical Application
Input Voltage 2.7V to 5.5V C IN 1F IN C+ CP 1F CEN/SET S2Cwire Interface OUT C OUT 1F
AAT3104
D1 D2 D3 EN/SET GND D4
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM
Pin Descriptions
Pin#
1 2 3 4 5 6 7 8 9 10
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Name
D2 D1 OUT CC+ GND EN/SET IN D4 D3
Description
LED2 Current Source Output. D2 is the output of LED2 current source. Connect LED2's anode to D2 and its cathode to GND. LED1 Current Source Output. D1 is the output of LED1 current source. Connect LED1's anode to D1 and its cathode to GND. Charge Pump Output. OUT is the output of the charge pump. Bypass OUT to GND with a 1F or larger ceramic capacitor. Charge Pump Capacitor Negative Node. Charge Pump Capacitor Positive Node. Connect a 1F ceramic capacitor between C+ and C-. Analog Ground. Connect this pin to the system's analog ground plane. LED Enable and serial control input. EN/SET is the ON/OFF control for the LED and the S2Cwire digital input for the AAT3104-1/-2 to control serially the LED brightness according to the maximum current. Power source input. Connect IN to the power source, typically the battery. Bypass IN to GND with a 1F or larger ceramic capacitor. LED4 Current Source Output. D4 is the output of LED4 current source. Connect LED4's anode to D4 and its cathode to GND. LED3 Current Source Output. D3 is the output of LED3 current source. Connect LED3's anode to D3 and its cathode to GND.
Pin Configuration
SC70JW-10 (Top View)
D2 D1 OUT CC+
1 2 3 4 5
10 9 8 7 6
D3 D4 IN EN/SET GND
2
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Absolute Maximum Ratings1
Symbol
VIN, VOUT, VC+, VC-, VD1...4 VEN/SET TS TJ TLEAD
Description
IN, C+, C-, OUT, D1, D2, D3, and D4 Pin Voltages to GND EN/SET Pin Voltage to GND Storage Temperature Range Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6.0 -0.3 to VIN + 0.3 -65 to 150 -40 to 150 300
Units
V V C C C
Thermal Information
Symbol
PD JA
Description
Maximum Power Dissipation2, 3 Maximum Thermal Resistance3
Value
625 160
Units
mW 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 an FR4 circuit board. 3. Derate 6.25mW/C above 40C ambient temperature.
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM
Electrical Characteristics1
IN = EN = 3.6V, CIN = 1F, COUT = 1F, C1 = 1F, TA = -40C to 85C unless otherwise noted. Typical values are at TA = 25C. Symbol Description Conditions Min
2.7 IN = 5.5V, EN = IN, VD1 = VD2 = VD3 = 0V IN = 5.5V, EN = IN, ID1 = ID2 = ID3 = ID4 = FS, VD1 = VD2 = VD3 = VD4 = IN - 1.5V, Exclude IDN current, 1x mode Operating, ID1 = ID2 = ID3 = ID4 = OPEN, 2x mode EN/SET = GND 6 3.5 6 1 150 5 0.8 150 190 30 31
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Typ
Max
5.5
Units
V mA mA mA A mA V MHz mV s mA mA % mA mA mV mV V V A s s s ns s
Input Power Supply VIN Input Voltage Range Iq Quiescent Current
IIN
No Load Operating Current
IIN(SHDN) Input Shutdown Current Charge Pump Section IOUT OUT Maximum Output Current VOUT Charge Pump Output Voltage fOSC Charge Pump Oscillator Frequency VIN_(TH) Charge Pump Mode Hysteresis tOUT LED Output Current Start-up Time AAT3104-1/-2: LED Current Source Outputs D1 - D4 Current Accuracy ID_(MAX) (AAT3104-1 only) D1 - D4 Current Accuracy ID_(MAX) (AAT3104-2 only) ID_(MAX) D1 - D4 Current Matching D1 - D4 Current Accuracy ID_(DATA15) (AAT3104-1 only) D1 - D4 Current Accuracy ID_(DATA29) (AAT3104-2 only) VD_(TH) D1- D4 Charge Pump Mode Transition Threshold
2
When charge pump is on 0.6 ID1 = ID2 = ID3 = ID4 =30mA EN/SET =IN DATA = 1, VIN - VF = 1.5V DATA = 1, VIN - VF = 1.5V DATA = 1, VIN - VF = 1.5V DATA = 15, VIN - VF = 1.5V DATA = 29, VIN - VF = 1.5V ID1 = ID2 = ID3 = ID4 = 30mA, VIN - VD1 is measured ID1 = ID2 = ID3 = ID4 = 20mA, VIN - VD1 is measured 1.4 EN/SET = IN = 5V -1 27 28 -3 1.6 1.6
1.05 250
33 34 +3
2.0 2.0 380 350
2.4 2.4
AAT3104-1/-2: EN/SET and S Cwire Control VENH EN/SET Input High Threshold Voltage VENL EN/SET Input Low Threshold Voltage IEN(LKG) EN/SET Input Leakage Current tEN/SET(OFF) EN/SET Input OFF Timeout tEN/SET(LAT) EN/SET Input Latch Timeout tEN/SET(LOW) EN/SET Input Low Time tENSET(H-MIN) EN/SET Minimum High Time tENSET(H-MAX) EN/SET Maximum High Time
0.3 50
0.4 1 500 500 75 75
1. The AAT3104 is guaranteed to meet performance specification over the -40C to 85C operating temperature range and are assured by design, characterization and correlation with statistical process controls.
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM
Typical Characteristics
VIN = 3.6V, CIN = COUT = C1 = 1F; TA = 25C, unless otherwise noted.
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
1X Mode Turn-On Waveform
(VIN = 4.2V; Load = 120mA)
2X Mode Turn-On Waveform
(VIN = 3.6V; Load = 120mA)
VLED (2V/div) IIN (200mA/div) VOUT (2V/div) EN (1V/div)
0 0
VLED (2V/div) IIN (250mA/div) VOUT (2V/div) EN (1V/div) Time (200s/div)
0 0
0 0
0
0
Time (200s/div)
2X Mode Turn-Off Waveform
(VIN = 3.6V; Load = 120mA)
2X Mode Output Ripple
(VIN = 3.6V; Load = 120mA)
IIN (250mA/div)
0
VLED (2V/div)
0
VOUT (AC Coupled) (20mV/div)
0
EN (1V/div)
0
VIN (AC Coupled) (5mV/div)
0
Time (200s/div)
Time (0.4s/div)
1mA to 30mA LED Current Step
(VIN = 4.2V) VLED 2V/div IIN 200mA/div VOUT 2V/div EN 1V/div
0 0 0
30mA to 1mA LED Current Step
(VIN = 4.2V) VLED (2V/div) IIN (200mA/div) VOUT (2V/div) EN (1V/div)
0 0 0
0
0
Time (80s/div)
Time (80s/div)
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM
Typical Characteristics
VIN = 3.6V, CIN = COUT = C1 = 1F; TA = 25C, unless otherwise noted.
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Current Matching vs. Temperature
(AAT3104-2; Code = 1)
33.0 32.5 90
Efficiency vs. Input Voltage
(ILED = 31mAx4; Voltage Sweep Upwards)
D1 D2 D3 D4 VF = 2.7V VF = 3.0V VF = 3.3V VF = 3.6V
80
Efficiency (%)
85
Current (mA)
32.0 31.5 31.0 30.5 30.0 29.5 29.0 -40 -15 10 35 60
70 60 50 40 30 2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Temperature (C)
Input Voltage (V)
Efficiency vs. Input Voltage
(ILED = 31mAx4; Voltage Sweep Downwards)
90 6.5
Quiescent Current vs. Input Voltage
Quiescent Current (mA)
6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 2.7 3.1 3.5 3.9 4.3 4.7 5.1
80
Efficiency (%)
70 60 50 40 30 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VF = 2.7V VF = 3.0V VF = 3.3V VF = 3.6V
85C 25C -40C
5.5
Input Voltage (V)
Input Voltage (V)
Shutdown Current vs. Temperature
25 850
Frequency vs. Temperature
ShutdownnCurrent (nA)
Frequency (KHz)
-40 -15 10 35 60 85
20
VIN = 5.5V VIN = 2.7V
840 830 820 810 800 790 780 770 760
15
10
5
0
750 -40
-15
10
35
60
85
Temperature (C)
Temperature (C)
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3104.2008.09.1.0
PRODUCT DATASHEET
AAT3104178
ChargePumpTM
Typical Characteristics
VIN = 3.6V, CIN = COUT = C1 = 1F; TA = 25C, unless otherwise noted.
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
No Load Operating Current vs. Input Voltage
(2x Mode)
6.4 1.2
EN Input High Threshold Voltage vs. Input Voltage
1.0
Operating Current (mA)
6.2 6.0 5.8 5.6 5.4
85C 25C -40C
VEN(H) (V)
0.8
0.6
0.4 5.2 5.0 2.7 0.2 2.7
85C 25C -40C
3.1 3.5 3.9 4.3 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)
EN Input Low Threshold Voltage vs. Input Voltage
1.2 330 300 1.0
EN/SET Input Latch Timeout vs. Input Voltage
TEN/SET(LAT) (s)
VEN(L) (V)
270 240 210 180 150 2.7
0.8
0.6
0.4
85C 25C -40C
3.1 3.5 3.9 4.3 4.7 5.1 5.5
0.2 2.7
85C 25C -40C
3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
Input Voltage (V)
EN/SET Input OFF Timeout vs. Input Voltage
400 350
TEN/SET(OFF) (s)
300
250
200
85C 25C -40C
3.1 3.5 3.9 4.3 4.7 5.1 5.5
150 2.7
Input Voltage (V)
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM
Functional Block Diagram
C+ C- OUT
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
D1
Two-Mode CP Control
IN
4
D2
VF Monitoring
D3
2x
D4
1x
GND
5 IREF
EN/SET
S2Cwire Control
5 Bits DAC
Functional Description
The AAT3104 is a low-cost charge-pump solution designed to drive up to four white LEDs. The charge pump operates from a 2.7V to 5.5V power source and converts it to voltage levels necessary to drive the LEDs. LED current is individually controlled through integrated current sources powered from the output of the charge pump. Low 1x charge-pump output resistance and lowdrop voltage current sources allow the charge pump to remain in 1x mode with an input voltage as low as 3.8V and LED forward voltages of 3.5V. Once in 2x mode, the charge pump monitors the input supply voltage and automatically switches back to 1x mode when there is sufficient input voltage. The AAT3104 requires only three external components: one 1F ceramic capacitor for the charge pump flying capacitor (CP), one 1F ceramic input capacitor (CIN), one
1F ceramic output capacitor (COUT). The four constant current outputs of the AAT3104 (D1 to D4) can drive four individual LEDs with a maximum current of 30mA each. AnalogicTech's S2Cwire serial interface enables the AAT3104-1/-2 and changes the current source magnitudes through the EN/SET pin.
S2Cwire Serial Interface
The LED output current of the AAT3104 is controlled by AnalogicTech's S2Cwire serial interface. Since the LED current is programmable, no PWM 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 LED current can be changed quickly and easily. Also, the non-pulsating LED
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Data
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
current reduces system noise and improves LED reliability. The S2Cwire interface relies on the number of rising edges to the EN/SET pin to set the register. A typical write protocol is a burst of EN/SET rising edges, followed by a pause with EN/SET held high for at least tLAT (500s). The programmed current is then seen at the current source outputs. When EN/SET is held low for an amount of time longer than tOFF (500s), the AAT3104 enters into shutdown mode and draws less than 1A from the input and the internal data register is reset to zero. The AAT3104-1/2's serial interface reduces the LED current on each rising pulse of the enable input. If the AAT3104 is in shutdown, the first rising edge of the EN/ SET input turns on the LED driver to the maximum current. Successive rising edges decrease the LED current as shown in Table 1 and Figure 2 for the AAT3104-1. For the AAT3104-2, Table 2 and Figure 3 illustrate a 32-step LED current control profile. EN Rising Edges
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
EN Rising Edges
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
D1-D4 Current (mA)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0.5
Data
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
D1-D4 Current (mA)
30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0.5
Table 2: AAT3104-2 LED Current Settings.
Table 1: AAT3104-1 LED Current Settings.
tHI
tLO
tOFF
OFF
1
2
3
OFF
Figure 1: EN/SET Timing Diagram.
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM
30.0
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Dx Output Current (mA)
30 25 20 15 10 5 0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
Dx Output Current (mA)
22.5
15.0
7.5
0 1 2 3 4
2
5
6
7
8
9
10 11 12 13 14 15 16
S C Wire Interface Data Code
S2C Wire Interface Data Code
Figure 2: AAT3104-1 Current Control Profile.
Figure 3: AAT3104-2 Current Control Profile.
Applications Information
LED Selection
The AAT3104 is specifically designed for driving white LEDs. However, the device design will allow the AAT3104 to drive most types of LEDs with forward voltage specifications ranging from 2.2V to 4.7V. LED applications may include mixed arrangements for display backlighting, keypad display, and any other application needing a constant current source generated from a varying input voltage. Since the D1 to D4 constant current sources are matched with negligible supply voltage dependence, the constant current channels will be matched regardless of the specific LED forward voltage (VF) levels. The low dropout current sources in the AAT3104 maximize performance and make it capable of driving LEDs with high forward voltages. Multiple channels can be combined to obtain a higher LED drive current without complication. All unused LED source pins should be connected to GND or left floating. Do not connect to the OUT pin.
Shutdown
Since the current switches are the only power returns for all loads, there is no leakage current when all source switches are disabled. To enter shutdown operation, the EN/SET input for the AAT3104-1/2 should be strobed low. After tOFF (500s), AAT3104 will be shut down and typically draws less than 1A from the input. Registers are reset to 0 in shutdown.
Power Efficiency and Device Evaluation
The charge pump efficiency discussion in the following sections accounts only for efficiency of the charge pump section itself. Due to the unique circuit architecture and design of the AAT3104, it is very difficult to measure efficiency in terms of a percent value comparing input power over output power. Since the AAT3104 outputs are pure constant current sources and typically drive individual loads, it is difficult to measure the output voltage for a given output to derive an overall output power measurement. For any given application, white LED forward voltage levels can differ, yet the output drive current will be maintained as a constant. This makes quantifying output power a difficult task when taken in the context of comparing to other white LED driver circuit topologies. A better way to quantify total device efficiency is to observe the total input power to the device for a given LED current drive level. The best white LED driver for a given application should be based on trade-offs of size, external component count, reliability, operating range, and total energy usage, not just output power over input power efficiency. The AAT3104 efficiency may be quantified under very specific conditions and is dependent upon the input voltage versus the output voltage across the loads applied
Device Switching Noise Performance
The AAT3104 operates at a fixed frequency of approximately 1MHz to control noise and limit harmonics that can interfere with the RF operation of mobile 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 AAT3104 soft-start feature prevents noise transient effects associated with inrush currents during start-up of the charge pump circuit.
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
-orto outputs D1 through for a given constant current setting. Depending on the combination of VIN and voltages sensed at the current sources, the device will operate in load switch mode. When any one of the voltages sensed at the current sources nears dropout, the device will operate in 2X charge pump mode. Each of these modes will yield different efficiency values. Refer to the following two sections for explanations for each operational mode.
VF (%) = 2 * V * 100
IN
1X Mode Efficiency
The AAT3104 1X mode is operational at all times and functions alone to enhance device power conversion efficiency when VIN is higher than the voltage across the load. When in 1X mode, voltage conversion efficiency is defined as output power divided by input power. An expression for the ideal efficiency () in 1X chargepump mode can be expressed as:
For a charge pump current source driver with VF of 3.2V and 2.7V input voltage, the theoretical efficiency is 59%. Due to internal switching losses and IC quiescent current consumption, the actual efficiency can be measured at 57%. Efficiency will decrease substantially as load current drops below 1mA or when the voltage level at VIN approaches the voltage level at VOUT.
Additional Applications
The current sources of the AAT3104 can be combined freely to drive higher current levels through one LED. As an example, a single LED can be driven at 120mA by combining together D1 through D4 outputs. For lower-cost applications, the flying capacitor can be removed; C+ and C- should be floating. This will force AAT3104 to operate in 1X mode. To maintain regulated LED current, the input supply voltage has to be higher than the charge-pump's dropout voltage in 1X mode plus the forward voltage of the LED at the preset LED current.
POUT VF * ILED VF * ILED VF = P = V *I =V *I VIN IN IN IN IN OUT
-or-
VF (%) = V * 100 IN
For a charge pump led driver with VF of 3.2V and 4.2V input voltage, the theoretical efficiency is 76%. Due to internal switching losses and IC quiescent current consumption, the actual efficiency can be measured at 73%.
Capacitor Selection
Careful selection of the three external capacitors CIN, CP, and 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 constant current sources are only programmed for light current levels, then the capacitor size may be decreased.
2X Charge Pump Mode Efficiency
The AAT3104 contains a charge pump which will boost the input supply voltage in the event where VIN is less than the voltage required to supply the output. The efficiency () can be simply defined as a linear voltage regulator with an effective output voltage that is equal to one and two times the input voltage. Efficiency () for an ideal 2X charge pump can typically be expressed as the output power divided by the input power.
Capacitor Characteristics
Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT3104. 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 maximizing charge pump transient response. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage.
=
PF PIN
In addition, with an ideal 2X charge pump, the output current may be expressed as 1/3 of the input current. The expression to define the ideal efficiency () can be rewritten as
POUT VF * ILED VF * ILED VF = P = V *I =V *2*I 2*V IN IN IN IN OUT IN
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM
Input Voltage 2.7V to 5.5V C IN 1F
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
IN C+ CP 1F CEN/SET S2Cwire Interface OUT C OUT 1F
AAT3104
D1 D2 D3 EN/SET GND D4
Figure 4: Higher Current, Single LED Application.
Input Voltage > VF + VDROP C IN 1F
IN C+
OUT C OUT 1F
AAT3104
D1 CD2 D3 EN/SET GND D4
EN/SET S2Cwire Interface
Figure 5: Lower Cost 1X Mode Application.
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.
itors larger than 1F are not typically required for AAT3104 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.
Evaluation Board Layout
When designing a PCB for the AAT3104, the key requirements are: 1. Place two flying capacitors C1 and C2 as close to the chip as possible; otherwise 2x mode performance will be compromised. Place input and output decoupling capacitors as close to the chip as possible to reduce switching noise and output ripple.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1F 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., larger than 2.2F) are often available in low cost Y5V and Z5U dielectrics, but capac-
2.
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AAT3104178
ChargePumpTM Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Evaluation Board Schematic
J1 DC + DC DC+ C 10uF
1 2 3
VIN C2 1F JP 1
OUT
D4 D3 D2 D1 JP2 U1 JP5 C1 1F CC+ IN
1 2 3 4 5 10 9 8 7 6
JP3
JP4
D2 D3 D1 D4 OUT VIN CEN/SET C+ GND AAT3104 EN
EN
C3 1F
S2C R2 20K
C6 4.7F
R5 R4 R3 1K 1K 1K S1 S1 UP S2 DOWN S3 S3 CYCLE
U2 PIC12F675 1 2 3 4 VDD GP5 GP4 GP3 VSS GP0 GP1 GP2 8 7 6 5 R6 330 LED1 Green S2C VR1 POT10K
C4 0.1F
R7 330 LED2 Red MCU Power
S2
Figure 6: AAT3104 Evaluation Board Schematic.
Figure 6: AAT3104 Evaluation Board Top Layer.
Figure 7: AAT3104 Evaluation Board Bottom Layer.
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PRODUCT DATASHEET
AAT3104178
ChargePumpTM
Ordering Information
Package
SC70JW-10 SC70JW-10
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Interface
S2Cwire S2Cwire
Current Control, Inverting
16-step 32-step
Marking1
4DXYY
Part Number (Tape and Reel)2
AAT3104IJQ-1-T1 AAT3104IJQ-2-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/about/quality.aspx.
Package Information
SC70JW-10
0.40 BSC
1.75 0.10 0.225 0.075
Top View
2.00 0.20 0.15 0.05
0.85 0.15
2.20 0.20 1.10 MAX
0.100
0.45 0.10 2.10 0.30
4 4
7 3
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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0.05 0.05
3104.2008.09.1.0
PRODUCT DATASHEET
AAT3104178
ChargePumpTM Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
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.
3104.2008.09.1.0
www.analogictech.com
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