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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications General Description
The AAT3151 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 AAT3151 is capable of driving four-channel LEDs at a total of 120mA 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 1F flying capacitors and two small 1F capacitors at VIN and VOUT) makes the AAT3151 ideally suited for small battery-powered applications. AnalogicTech's AS2CwireTM (Advanced Simple Serial ControlTM) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 50A for optimized efficiency, with a low housekeeping current of only 40A. Each output of the AAT3151 is equipped with builtin protection for VOUT short-circuit and auto-disable for LED failure condition. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1A. The AAT3151 is available in a space-saving, thermally-enhanced, 12-pin 3x3mm DFN package.
Features
* *
ChargePumpTM
* * * * * * * * * * *
VIN Range: 2.7V to 5.5V Fully Programmable Current with Single Wire * 16-Step Logarithmic Scale * 15/20/30mA Max Current * Four Low Current Settings Down to 50A * Low IQ (40A) for Low Current Mode Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage Drives Four Channels of LEDs Individual Main/Sub-Group Control No Inductors, Low Noise Operation 1MHz Constant Switching Frequency Small Application Circuit Built-In Thermal Protection Built-In Auto-Disable for Short-Circuit Automatic Soft-Start IQ <1A in Shutdown Thermally Enhanced 3x3mm 12-Pin DFN Package
Preliminary Information
Applications
* * * * Color (RGB) Lighting Programmable Current Sinks White LED Backlighting White Photo-Flash for DSCs
Typical Application
2.7V to 5.5V
CIN 1F
VIN
C1+
C1 1F
C1C2+
AAT3151
C2VOUT
C2 1F
D1
D2
D3
D4
COUT 1F
EN/SET
EN/SET
D1 D2 D3 GND D4
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications Pin Descriptions
Pin #
1 2 3 4 5 6 7 8 9 10 11 12 EP
Symbol
D4 EN/SET C1+ C1VOUT C2+ C2IN GND D1 D2 D3
Function
Current sink input #4. AS2Cwire serial interface control pin. Flying capacitor 1 + terminal. Connect a 1F capacitor between C1+ and C1-. Flying capacitor 1 - terminal. Charge pump output to drive load circuit. Requires 1F capacitor connected between this pin and ground. Flying capacitor 2 + terminal. Connect a 1F capacitor between C2+ and C2-. Flying capacitor 2 - terminal. Input power supply. Requires 1F capacitor connected between this pin and ground. Ground. Current sink input #1. Current sink input #2. Current sink input #3. Exposed paddle (bottom). Connect to ground.
Pin Configuration
DFN33-12 (Top View)
D4 EN/SET C1+ C1VOUT C2+
1 2 3 4 5 6
12 11 10 9 8 7
D3 D2 D1 GND VIN C2-
2
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications Absolute Maximum Ratings1
Symbol
VIN VEN/SET IOUT 2 TJ TLEAD
Description
Input Voltage EN/SET to GND Voltage Maximum DC Output Current Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6 -0.3 to VIN + 0.3 150 -40 to 150 300
Units
V V mA C C
Notes: 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.
Thermal Information
Symbol
PD JA
Description
Maximum Power Dissipation Maximum Thermal Resistance1
1, 2
Value
TBD TBD
Units
W C/W
Notes: 1. Mounted on an FR4 board. 2. Derate 6.25 mW/C above 25C.
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications Electrical Characteristics1
CIN = COUT = C1 = C2 = 1.0F; TA = -40C - 85C, unless otherwise noted. Typical values are at TA = 25C, VIN = 3.5V. Symbol Description Conditions Min
2.7 0.3 1 TBD 40 27 30 0.5 150 1 33 5
Typ
Max
5.5 1 3 TBD
Units
V
Input Power Supply VIN Operation Range 1X Mode, 3.0 VIN 5.5, Active, No Load Current 1.5X Mode, 3.0 VIN 5.5, Active, ICC Operating Current No Load Current 2X Mode, 3.0 VIN 5.5, Active, No Load Current 50A Setting, 1X Mode ISHDN Shutdown Current EN/SET = 0 IDX ISINK Current Accuracy 2 ISET = 30mA, TA = 25C 3 I(D-Match) Current Matching VF:D1:D4 = 3.6V VTH 1X to 1.5X or 1.5X to 2X Transition ISET = 20mA Threshold at Any ISINK Pin Charge Pump Section TSS Soft Start Time FCLK Clock Frequency EN/SET VEN(L) Enable Threshold Low VIN = 2.7V VEN(H) Enable Threshold High VIN = 5.5V TEN/SET LO EN/SET Low Time TEN/SET HI Minimum EN/SET High Time TOFF EN/SET Off Timeout TLAT EN/SET Latch Timeout EN/SET Input Leakage IEN/SET
mA
A A mA % mV
100 1000 0.4 1.4 0.3 50 500 500 1 75
s kHz V V s ns s s A
-1
Notes: 1. The AAT3151 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. Determined by the average of all active channels. 3. Current matching is defined as the deviation of any sink current from the average of all active channels.
4
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications Typical Characteristics
Efficiency vs. Supply Voltage
100
Turn On to 1X Mode VIN = 4.2V, DX = 20mA
EN (2V/div) CP (2V/div) VSINK (500mV/div) IIN (100mA/div)
4.1mA
90
10.2mA
20mA
Efficiency (%)
80
70
60
50 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2
Supply Voltage (V)
100s/div
Turn On to 1.5X Mode VIN = 3.5V, DX = 20mA
EN (2V/div) CP (2V/div) VSINK (500mV/div) IIN (100mA/div) 100s/div EN (2V/div) CP (2V/div) VSINK (500mV/div) IIN (100mA/div)
Turn On to 2X Mode VIN = 2.8V, DX = 20mA
100s/div
Turn Off from 1.5X Mode VIN = 3.5V, DX = 20mA
EN (2V/div) VF (1V/div) IIN (200mA/div)
200s/div
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
Functional Block Diagram
C1+
C1- C2+
C2-
VIN
1X, 1.5X and 2X Charge Pump
VOUT
Soft-Start Control 1MHz Oscillator Voltage Reference D/A 6 x 16 bit ROM D/A D/A
D1 D2 D3
EN/SET
AS 2 Cwire Interface
6 x 16 bit ROM
D/A
D4 GND
Functional Description
The AAT3151 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 AAT3151 charge pump is enabled when any of the four current sinks near dropout. The charge pump initially starts in 1.5X mode. If the charge pump output drops enough for any current sink to become close to dropout, the charge pump will automatically transition to 2X mode. The AAT3151 requires only four external components: two 1F ceramic capacitors for the charge pump flying capacitors (C1 and C2), one 1F ceramic input capacitor (CIN), and one 1F ceramic charge pump output capacitor (COUT). The AAT3151 constant current sinks can drive four individual LEDs with a maximum current of 30mA 6
per channel. The AS2Cwire serial interface enables the AAT3151 and sets the constant current sink magnitudes. AS2Cwire addressing allows the LED main channels D1-D3 to be controlled independently from the LED sub-channel D4.
Constant Current Output Level Settings
The constant current level for the LED channels is set via the AS2Cwire serial interface according to a logarithmic scale. In this manner, LED brightness appears to change linearly when the settings in the scale are traversed. Because the inputs D1 to D4 are true independent constant current sinks, the voltage observed on any single given input will be determined by the difference between VOUT and the actual forward voltage (VF) of the LED being driven. Since the constant current levels for the AAT3151 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
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
(>1MHz data rate), the LED current drive 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. For each Max current scale, there are 16 current level settings separated from one another by approximately 1dB. Code 1 is full-scale current and Code 15 is full-scale current attenuated by roughly 14dB. Code 16 is reserved as a "no current" setting. The AAT3151 has an additional Low Current mode with reduced quiescent current. This mode is especially useful for low current applications where a continuous, low current state is maintained. The reduction in quiescent current significantly reduces the impact due to maintaining a continuous backlighting state.
AS2Cwire Serial Interface
The Advanced Simple Serial Control (AS2Cwire) single wire interface is used to set the possible combinations of current levels and LED channel states. AS2Cwire has addressing capability for multiple data registers. With multiple data registers, the AAT3151 main and sub-channels can be programmed together or independently from one another. AS2Cwire relies on the number of rising edges of the EN/SET pin to address and load the registers. AS2Cwire latches data or address after the EN/SET pin has been held high for time TLAT. Address or data is differentiated by the number of EN/SET rising edges. Since the data registers are 4 bits each, the differentiating number of pulses is 24 or 16, so that Address 1 is signified by 17 rising edges, Address 2 by 18 rising edges, and so forth. Data is set to any number of rising edges between 1 and including 16. A typical write protocol is a burst of EN/SET rising edges, signifying a particular Address, followed by a pause with EN/SET held high for the TLAT timeout period, a burst of rising edges signifying Data, and a TLAT timeout for the data registers. Once an address is set, then multiple writes to the corresponding data register are allowed. When EN/SET is held low for an amount of time greater than TOFF, the AAT3151 enters into shutdown mode and draws less than 1A from the supply. Address 1 is the default address on the first rising edge after the AAT3151 has been disabled. Whenever shutdown mode is entered, all registers are reset to 1.
Constant Current Programming Levels (mA)1
Data
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
20mA Max IOUT (mA)
20.0 17.8 15.9 14.3 12.7 11.1 10.2 8.9 7.9 7.0 6.3 5.7 5.1 4.4 4.1 0.0
2
30mA Max 15mA Max IOUT (mA) IOUT (mA)
30.0 26.7 23.8 21.4 19.0 16.7 15.2 13.3 11.9 10.5 9.5 8.6 7.6 6.7 6.2 0.0 15.0 13.3 11.9 10.7 9.5 8.3 7.6 6.7 6.0 5.2 4.8 4.3 3.8 3.3 3.1 0.0
1. There is an additional Low Current mode with currents down to 50A. See the Low Current Register Settings section. 2. The device defaults to the 20mA Max scale. Use the Max Current Register to change the Max Scale.
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
AS2Cwire Serial Interface Timing
Address
T HI T LO TLAT TLAT
Data
EN/SET
1 2 17 18 1 2... n <= 16
Address
1
2
Data Reg 1
1
n
Data Reg 2
1
AS2Cwire Addressing
Five addresses are available to enable all of the part's functionality. Two 4-bit registers control the main and sub-channel, giving 16 settings for each. The main and sub-channel are programmed to the same constant current level by using Address 1. Use Addresses 2 and 3 to program the main and subchannel independently. Use Address 4 to program the Max Current register, which sets the Max Current scale. Lastly, Address 5 programs the Low Current register. The Low Current register controls the efficient Low Current mode. When the Max Current register is programmed to 1, 2, or 3, changing the data for Addresses 1-3 will result in the corresponding values found in the Constant Current Programming Levels table. When the Max Current register is programmed to 4, the part is programmed to operate in Low Current mode and the Data for Addresses 1-3 is irrelevant. In Low Current mode, the Low Current register takes precedence. See the Low Current Register Settings table below for the current level settings and main/ sub-configurations that result. EN/SET Edges
17 18 19 20 21
Max Current and Low Current Registers
Use the Max Current and Low Current registers to program constant current settings outside of the 20mA Max scale. By default (without changing the Max Current register), the AAT3151 operates in the 20mA Max scale (see Constant Current Programming Levels). For example, to change to the 30mA Max scale, address the Max Current register with 20 rising edges and pause for TLAT. Program the Max Current register with 2 rising edges and pause for TLAT. The part will next operate in the same Data row, but for the setting found in the 30mA Max column. Next, to change to a different setting on the 30mA Max scale, address the D1-D4 register with 17 rising edges. Program the new constant current level with 1-16 rising edges. The part will update to the new Data setting according to the Constant Current Programming Levels table. The AAT3151 has a distinct Low Current mode with ultra-low quiescent current. For drive currents of 2mA or less, the part operates with significantly reduced quiescent current. This is particularly useful for applications requiring an "always on" condition such as transmissive displays. As an example, to change to Low Current mode, address the Max Current register with 20 rising edges and pause for TLAT. Program the Max Current register with 4 rising edges and pause for TLAT. Address the Low Current register with 21 rising edges and pause for TLAT. Program the Low Current register with 1-16 rising edges. The part will update to the new Low Current mode setting and operate with significantly reduced quiescent current.
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Address
1 2 3 4 5
Addressed Register
1&2: D1-D4 Current 1: D1-D3 Current 2: D4 Current 3: Max Current 4: Low Current
8
AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
Max Current Register Settings--Address 4 Data
1 2 3 4
Thermal Protection
The AAT3151 has a 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 of the VOUT pin.
Max Current
20mA Max scale 30mA Max scale 15mA Max scale Low Current Mode
3
Low Current Register Settings--Address 5 Data
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Applications Information
LED Selection
The AAT3151 is specifically intended for driving white LEDs. However, the device design will allow the AAT3151 to drive most types of LEDs with forward voltage specifications ranging from 2.0V to TBDV. LED applications may include main and subLCD display backlighting, camera photo-flash applications, color (RGB) LEDs, infrared (IR) diodes for remotes, and other loads benefiting from a regulated output current generated from a varying input voltage. Since the D1 to D4 constant 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 AAT3151 make it capable of driving LEDs with forward voltages as high as TBDV at full current from an input supply as low as 3.0V. Current sinks can be paralleled to drive highcurrent LEDs without complication.
D1-D3 (mA)
0 0 0 0 0 0 0 0 0.05 0.5 1 2 0.05 0.5 1 2
D4 (mA)
0 0 0 0 0.05 0.5 1 2 0 0 0 0 0.05 0.5 1 2
Disabled Current Sinks
Current sink inputs that are not used should be disabled. To disable and properly terminate unused current sink inputs, they must be tied to VOUT. If left unconnected or terminated to ground, the part will be forced to operate in 2X charge pump mode. Properly terminating unused current sink inputs is important to prevent the charge pump modes from activating prematurely. When properly terminated, only a small sense current flows for each disabled channel. The sense current for each disabled channel is less than 10A. The AAT3151 is also equipped with an "auto-disable" feature to protect against an LED failure condition.
Device Switching Noise Performance
The AAT3151 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-topeak, typically ten times less than inductor-based DC/DC boost converter white LED backlight solutions. The AAT3151 soft-start feature prevents noise transient effects associated with in-rush currents during the start up of the charge pump circuit.
3. Low Current mode requires the Max Current register to be set to Low Current Mode. Low Current mode is unaffected by the settings for Addresses 1-3.
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
Power Efficiency and Device Evaluation
The charge pump efficiency discussion in the following sections only account for the efficiency of the charge pump section itself. Due to the unique circuit architecture and design of the AAT3151, it is very difficult to measure efficiency in terms of a percent value comparing input power over output power. Since the AAT3151 outputs are pure constant current sinks and typically drive individual loads, it is difficult to measure the output voltage for a given output (D1 to D4) 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 "% efficiency". The AAT3151 efficiency may be quantified under very specific conditions and is dependent upon the input voltage versus the output voltage seen across the loads applied to outputs D1 through D4 for a given constant current setting. Depending on the combination of VIN and voltages sensed at the current sinks, the device will operate in "Load Switch" mode. When any one of the voltages sensed at the current sinks nears dropout, the device will operate in 1.5X or 2X charge pump mode. Each of these modes will yield different efficiency values. One should refer to the following two sections for explanations for each operational mode. POUT PIN
=
The expression to define the ideal efficiency () can be rewritten as: POUT VOUT x IOUT VOUT = = PIN VIN x IOUT VIN
= -or-
(%) = 100
VOUT VIN
Charge Pump Section Efficiency
The AAT3151 contains a fractional charge pump that will boost the input supply voltage in the event where VIN is less than the voltage required on the constant current source outputs. The efficiency () can be simply defined as a linear voltage regulator with an effective output voltage that is equal to one and a half or two times the input voltage. Efficiency () for an ideal 1.5X charge pump can typically be expressed as the output power divided by the input power. POUT PIN
=
In addition, with an ideal 1.5X charge pump, the output current may be expressed as 2/3 of the input current. The expression to define the ideal efficiency () can be rewritten as: = POUT VOUT x IOUT VOUT = = PIN VIN x 1.5IOUT 1.5VIN VOUT 1.5VIN
Load Switch Mode Efficiency
The AAT3151 load switch mode is operational at all times and functions alone to enhance device power conversion efficiency when VIN is greater than the voltage across the load. When in "Load Switch" mode, the voltage conversion efficiency is defined as output power divided by input power:
(%) = 100
10
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
For a charge pump with an output of 5 volts and a nominal input of 3.5 volts, the theoretical efficiency is 95%. Due to internal switching losses and IC quiescent current consumption, the actual efficiency can be measured at 93%. These figures are in close agreement for output load conditions from 1mA to 100mA. Efficiency will decrease as load current drops below 0.05mA or when level of VIN approaches VOUT. ceramic capacitors help maximize charge pump transient response. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage.
Equivalent Series Resistance
ESR is an important characteristic to consider when selecting a capacitor. ESR is a resistance internal to a capacitor, which 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.
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 performance. Optimum performance will be obtained when low equivalent series resistance (ESR) (<100m) ceramic capacitors are used. In general, low ESR may be defined as less than 100m. A capacitor value of 1F for all four capacitors is a good starting point when choosing capacitors. If the constant current sinks are only programmed for light current levels, then the capacitor size may be decreased.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1F are typically made from NPO or COG materials. NPO and COG 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 lowcost Y5V and Z5U dielectrics, but capacitors greater than 1F are typically not required for AAT3151 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 Characteristics
Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT3151. 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 non-polarized. Low ESR
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AAT3151
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications Ordering Information
Package DFN33-12 Marking Part Number (Tape and Reel)
Package Information
Index Area (D1/2 x E1/2) Index Area (D/2 x E/2) Detail "B"
2.85 0.10
3.00 0.05
Pin 1 Indicator (optional) 0.16 0.35 0.10 0.075 0.075 0.1 REF
Detail "A"
Top View (Punch Type)
Bottom View Top View (Saw Type)
7.5 7.5 7.5 7.5
0.229 0.51
1.00
Detail "B"
CD_30 (4x) max Chamfered corner (optional)
0.05 0.05
Side View (Punch Type)
All dimensions in millimeters.
Side View (Saw Type)
Detail "A"
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, and advise customers 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 subject 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 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.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 12
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0.21 0.05
0.45 0.05
2.85 0.10
3.00 0.05
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