AAT3113

AAT3113_08 ANALOGICTECH | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 15

Technical content

Features

• AAT3113: Four Outputs
• AAT3114/14A: Six Outputs
• 20mA Full-Scale Current
• Simple Serial Control (S 2Cwire) Interface ▪ 32-Position Logarithmic Scale with Digital Control
• Low Noise Constant Frequency Operation
• 33% Less Input Current Than Doubler Charge Pump
• High Accuracy Brightness Matching
• Small Application Circuit
• Regulated Output Current
• Automatic Soft Start
• V IN Range: 2.7V to 5.5V
• No Inductors
• 600kHz Switching Frequency
• I Q <1µA in Shutdown
• Temperature Range: -40°C to 85°C
• 12-Pin TSOPJW Package (AAT3113)
• 16-Pin QFN Package (AAT3114/14A)

Applications

• Programmable Current Source
• White LED Backlighting Typical Application CIN 1µFVBATTERY COUT 1µF EN/SET 1µF 1µF D4 D3 D2 D1 VIN OUT C1+ C1- C2+ C2- EN/SET GND AAT3113 CIN 1µF VBATTERY COUT 1µF EN/SET 1µF 1µF D4 D3 D2 D1 VIN OUT C1+ C1- C2+ C2- EN/SET GND AAT3114/14A D5D6

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET Pin Descriptions Pin Number Symbol FunctionAAT3114/14A AAT3113 1 7 D2 Current source output 2. If not used, leave pin fl oating. 2 6 D3 Current source output 3. If not used, leave pin fl oating. 3 5 D4 Current source output 4. If not used, leave pin fl oating. 4 N/A D5 Current source output 5. If not used, leave pin fl oating. 5 N/A D6 Current source output 6. If not used, leave pin fl oating. 6 4 C1+ Flying capacitor 1 positive terminal. 7 3 C1- Flying capacitor 1 negative terminal. 8 N/A NC No connect. 9 2 OUT Charge pump output. Requires 1µF bypass capacitor to ground. 10 1 C2+ Flying capacitor 2 positive terminal. 11 12 C2- Flying capacitor 2 negative terminal. 12 11 GND Ground. 13 N/A NC No connect. 14 10 VIN Input power supply. Requires 1µF bypass capacitor to ground. 15 9 EN/SET Control pin using S 2Cwire serial interface. 16 8 D1 Current source output 1. Required reference current source. Do not leave pin fl oating. EP Exposed paddle (bottom); connect to GND directly beneath package. Pin Configuration TSOPJW-12 QFN44-16 (Top View) (Top View) AAT3113 AAT3114/14A C2+ OUT C1- C1+ C2- GND VIN EN/SET C1+ C1- NC OUT C2+ C2- GND NC VIN EN/SET

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET Part Number Descriptions Part Number V IN Range Number of LED Outputs, 20mA Full-Scale LED Present Detect Current Package AAT3113ITP 3.0V ≤ VIN ≤ 5.5V 4 2µA TSOPJW-12 AAT3114ISN 3.2V ≤ VIN ≤ 5.5V 6 2µA QFN44-16AAT3114AISN 150µA Absolute Maximum Ratings TA = 25°C, unless otherwise noted. Symbol Description Value Units VIN Input Voltage -0.3 to 6 V VOUT Charge Pump Output -0.3 to 6 V VEN/SET EN/SET to GND Voltage -0.3 to 6 V VEN/SET(MAX) Maximum EN/SET to Input Voltage 0.3 V IOUT Maximum DC Output Current (sum of IOUT and D currents) 150 mA θJA Thermal Resistance 37 °C/W TJ Operating Junction Temperature Range -40 to 150 °C

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET

Electrical Characteristics

VIN = 3.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at T A = 25°C. Symbol Description Conditions Min Typ Max Units Input Power Supply VIN Operation Range 2.7 5.5 V ICC Operating Current Active, No Load Current 1 2 mA ISHDN Shutdown Current EN = 0 1µ A IDX Output Current AAT3113: 3.0V ≤ VIN ≤ 5.5V TA = 25°C, All Outputs Max Current 18 20 22 mAAAT3114/14A: 3.2V ≤ VIN ≤ 5.5V ∆ID/∆VIN Output Current Line Regulation 3.0V ≤ VIN ≤ 5.5V -2 2 %/V I(D-Match) Current Matching Between Any Two Outputs VD1:Dn = 3.6V, VIN = 3.3V 0.3 % η Effi ciency V IN = 3.5V, IOUT(total) = 40mA 93 % Charge Pump tSS Soft-Start Time 400 µs FCLK Clock Frequency 300 600 900 kHz EN/SET VEN(L) Enable Threshold Low V IN = 2.7V to 5.5V 0.5 V VEN(H) Enable Threshold High V IN = 2.7V to 5.5V 1.4 V tLO EN/SET Low Time 0.3 75 µs tHI Minimum EN/SET High Time 50 ns tOFF EN/SET Off Timeout 300 500 µs Input Current EN/SET Input Leakage V IN = 5.5V -1 1 µA

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET Typical Characteristics VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF; TA = 25°C, unless otherwise noted. Quiescent Current vs. Temperature 0.86 0.88 0.90 0.92 0.94 0.96 0.98 1.00 -40 -20 0 20 40 60 80 100 Temperature (°C) IQ (mA) Efficiency vs. Supply Voltage 100 Supply Voltage (V) Efficiency (%)120mA 80mA 60mA 40mA 30mA 20mA Quiescent Current vs. Supply Voltage 0.6 0.7 0.8 0.9 1.0 1.1 1.2 Supply Voltage (V) IQ (mA) Efficiency vs. Load Current 0 20 40 60 80 100 120 Load Current (mA) Efficiency (%) Shutdown Current vs. Temperature 0.001 0.010 0.100 1.000 -40 -20 0 20 40 60 80 100 Temperature (°C) Shutdown Current (µA) Oscillator Frequency vs. Temperature 610 620 630 640 650 660 670 680 690 700 710 -40 -20 0 20 40 60 80 100 Temperature (°C) FOSC (kHz)

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET Typical Characteristics VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF; TA = 25°C, unless otherwise noted. Normalized IDIODE vs. Temperature 0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02 - 4 0 - 2 0 0 2 04 06 08 01 0 0 Temperature (°C) IDIODE IDIODE Response (-31dB to 0dB) Time (10µs/div) ENSET (2V/div) IDIODE -31dB 0dB IDIODE vs. VIN 100 120 140 3.0 3.5 4.0 4.5 VIN (V) IDIODE (mA) IDIODE Response (-9dB to -10dB) Time (10µs/div) ENSET (2V/div) IDIODE -9dB 0dB -10dB -31dB IDIODE vs. VDIODE 100 120 140 VDIODE (V) IDIODE (mA) 0.750 0.775 0.800 0.825 0.850 0.875 0.900 0.925 0.950 0.975 1.000 VIN (V) VIH and VIL (V) VIH VIL VIH and VIL vs. VIN

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET Typical Characteristics VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF; TA = 25°C, unless otherwise noted. Turn-On Time (100µs/div) ENSET (2V/div) OUT (5V/div) VDIODE (2V/div) IIN (50mA/div) Turn-Off Time (200µs/div) ENSET (2V/div) OUT (5V/div) VDIODE (5V/div) IIN (50mA/div) 40mA Load Characteristics Time (1µs/div) 10mV/div IN OUT VDIODE 60mA Load Characteristics Time (1µs/div) 20mV/div IN OUT VDIODE 80mA Load Characteristics Time (1µs/div) 20mV/div IN OUT VDIODE 120mA Load Characteristics Time (1µs/div) 20mV/div IN OUT VDIODE

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET Functional Description The AAT3113 and AAT3114/14A devices are high effi- ciency 1.5X fractional charge pumps intended for white LED backlight applications. The fractional charge pump consists of a linear regulator followed by a 1.5X charge pump. The AAT3113 and AAT3114/14A require only four external components: two 1µF ceramic capacitors for the charge pump flying capacitors (C1 and C2), one 1µF ceramic capacitor for C IN, and one 0.33µF to 1µF ceram- ic capacitor for C OUT. The charge pump output is con- verted into four or six constant current outputs (D1 to D4 or D6) to drive four or six individual LEDs with a maximum of 20mA each. The current source output magnitude is controlled by the EN/SET serial data S 2Cwire interface. The interface records rising edges of the EN/SET pin and decodes them into 32 individual cur- rent level settings each 1dB apart (see Table 1, Current Level Settings). Code 32 is full scale, and Code 1 is full scale attenuated by 31dB. The modulo 32 interface wraps states back to state 1 after the 32nd clock. With each EN/SET pulse, the output current increases by 1dB. To decrease the output current by 1dB, 31 EN/SET clock pulses are required. The counter can be clocked at speeds up to 1MHz, so intermediate states are not visi- ble. The first rising edge of EN/SET enables the IC and initially sets the output LED current to -31dB, the lowest setting equal to 525µA. Once the final clock cycle is input for the desired brightness level, the EN/SET pin is held high to maintain the device output current at the pro- grammed level. The device is disabled 500µs after the EN/SET pin transitions to a logic low state. Functional Block Diagram Voltage Reference Soft Start 600kHz Oscillator 1.5X Charge Pump S2Cwire Interface 32x8 bit ROM Current Mode DAC VIN C1+ C1- C2+ C2- OUT GND * AAT3114/14A only EN/SET D5* D6*

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET Applications Information Current Level Settings LED current level is set via the serial interface according to a logarithmic scale where each code is 1dB greater than the previous code. In this manner, the LED bright- ness appears linear with each increasing code. Code 20mA max Code 20mA max 1 0.549 17 3.529 2 0.627 18 4.000 3 0.706 19 4.471 4 0.784 20 5.020 5 0.863 21 5.647 6 1.020 22 6.353 7 1.098 23 7.059 8 1.255 24 7.922 9 1.412 25 8.941 10 1.569 26 10.039 11 1.804 27 11.216 12 1.961 28 12.627 13 2.275 29 14.118 14 2.510 30 15.843 15 2.824 31 17.804 16 3.137 32 20.000 Table 1: Current Level Settings. EN/SET Serial Interface The current source output magnitude is controlled by the EN/SET pin using AnalogicTech’s Simple Serial Control 2Cwire) interface. The interface records rising edges of the EN/SET pin and decodes them into 32 individual cur- rent level settings each 1dB apart. Code 32 is full scale, and Code 1 is full scale attenuated by 31dB. The modulo 32 interface wraps states back to state 1 after the 32nd clock, so 1dB of attenuation is achieved by clocking the EN/SET pin 31 times (see graph titled, “I DIODE Response -9dB to -10dB”). The counter can be clocked at speeds up to 1MHz, so intermediate states are not visible. The first rising edge of EN/SET enables the IC and initially sets the output LED current to -31dB, the lowest setting equal to 525µA. Once the final clock cycle is input for the desired brightness level, the EN/SET pin is held high to maintain the device output current at the programmed level. The device is disabled 500µs after the EN/SET pin transitions to a logic low state. The EN/SET timing is designed to accommodate a wide range of data rates. After the first rising edge of EN/SET, the charge pump is enabled and reaches full capacity after the soft-start time (T SS). During the soft-start time, multiple clock pulses may be entered on the EN/SET pin to set the final output current level with a single burst of clocks. Alternatively, the EN/SET clock pulses may be entered one at a time to gradually increase the LED brightness over any desired time period. A constant cur- rent is sourced as long as EN/SET remains in a logic high state. The current source outputs are switched off after EN/SET has remained in a low state for at least the t OFF timeout period (see Figure 2). 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1 2 3 4 5 6 7 8 9 1 01 11 21 31 41 51 61 71 81 92 02 12 22 32 42 52 62 72 82 93 03 13 2 Code Normalized Current to Full Scale Figure 1: Normalized Current Level Settings.

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET 100 200 300 400 500 600 700 0 20 40 60 80 100 120 140 Output (LED) Current (mA) Input Power (mW) VIN = 3.6V Figure 3: AAT3113/AAT3114 Input Power vs. LED Current Capacitor Selection Careful selection of the four external capacitors C IN, 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) ceramic capacitors are used. In gen- eral, low ESR may be defined as less than 100m Ω. A value of 1µF for all four capacitors is a good starting point when choosing capacitors. If the LED current sources are only programmed for minimal current levels, then the capacitor size may be decreased. Capacitor Characteristics Ceramic composition capacitors are highly recommend- ed over all other types of capacitors for use with the AAT3113 and AAT3114/14A products. Ceramic capaci- tors 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 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 that is caused by the leads, internal connec- tions, size or area, material composition, and ambient temperature. Capacitor ESR is typically measured in mil- liohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. Ceramic Capacitor Materials Ceramic capacitors less than 0.1µF are typically made from NPO or C0G materials. NPO and C0G materials generally have tight tolerance and are very stable over temperature. Larger capacitor values are usually com- posed 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 AAT3113 or AAT3114/14A 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. Test Current/Channel Disable Each channel of the output is equipped with a test cur- rent function. The AAT3113 and AAT3114 use a small (~2µA) current source injected into each output pin to detect the presence of an LED. Unused channels other than channel 1 should be left open and will be automati- cally diasbled instead of wasting the programmed output current. The test current in the AAT3114A is higher (~150µA) to accommodate LEDs with lower impedance in failure mode. Thermal Protection The AAT3113 and AAT3114/14A have a thermal protec- tion circuit that will shut down the charge pump and current outputs if the die temperature rises above the thermal limit. However, thermal resistance of the QFN package is so low that if, in the case of the AAT3114/14A, all six outputs are shorted to ground at maximum 20mA output level, the die temperature will not rise sufficient- ly to trip the thermal protection. The thermal protection will only trip if C OUT is shorted to ground and the ambient temperature is high.

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET Driving White LED Display Module Backlights and Individual White LEDs Connected in Parallel The AAT3114/14A D1 to D6 outputs are true constant current sources capable of driving up to 20mA each over the operation input voltage range. Since these outputs are true constant current sources, they may be con- nected in parallel to drive a single power output. Any combination of outputs (D1 to D6) may be connected in parallel. The maximum total output current is a sum of parallel-connected current sources. This feature is par- ticularly useful to power pre-manufactured display mod- ules that are pre-wired with white LED backlights con- nected in a parallel circuit configuration. All outputs can be connected in parallel to drive groups of LEDs as well. The internal current source reference circuit bases feed- back from current sensed on the D1 output. For best operation, the only requirement for this application is that the output D1 should always be connected to the load circuit.

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET

Ordering Information

Package Marking 1 Part Number (Tape and Reel)2 TSOPJW-12 HTXYY AAT3113ITP-20-T1 QFN44-16 FGXYY AAT3114ISN-20-T1 QFN44-16 OVXYY AAT3114AISN-20-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

4.000 ± 0.050 Pin 1 Dot By Marking 2.400 ± 0.050 0.550 ± 0.020 2.400 ± 0.050 4.000 ± 0.050 2.280 REF

0.650 BSC

0.900 ± 0.100 Pin 1 Identification C0.3 13 16 0.025 ± 0.025 0.214 ± 0.036 0.330 ± 0.075 Top View Bottom View Side View All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on all part numbers listed in BOLD. 3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.

AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET AAT31 13, AAT31 14/14A High Efficiency 1.5X Fractional Charge Pumps For White LED ApplicationsChargePump TM PRODUCT DATASHEET Advanced Analogic Technologies, Inc.

3230 Scott Boulevard, Santa Clara, CA 95054

Phone (408) 737-4600 Fax (408) 737-4611 © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech pr oduct. 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 specifi cations 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 fi tness 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. Specifi c 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. TSOPJW-12 0.20 + 0.10 - 0.05 0.055 ± 0.045 0.45 ± 0.15 7° NOM 4° ± 4° 3.00 ± 0.10 2.40 ± 0.10 2.85 ± 0.20 0.15 ± 0.05 0.9625 ± 0.0375 1.00 + 0.10 - 0.065

0.04 REF

0.010 2.75 ± 0.25 All dimensions in millimeters.