AAT3142 Advanced Analogic Technologies, Inc., AAT3142 Datasheet
AAT3142
Available stocks
Related parts for AAT3142
AAT3142 Summary of contents
Page 1
... A high charge pump switch- ing frequency enables the use of very small external capacitors. In shutdown mode, the device discon- nects the load from V and reduces quiescent cur- IN rent to less than 1µA. The AAT3142 is available in the very small, Pb-free 12-pin TSOPJW package. Typical Application V BATTERY 3142.2007.03.1.2 High Efficiency 1X/1 ...
Page 2
... Input power supply. Requires 1µF capacitor connected between this pin and ground. 11 GND Ground pin; must be connected to Pin 7. 12 C2- Flying capacitor 2 negative terminal. Pin Configuration 2 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications TSOPJW-12 (Top View) C2+ C2 GND C1+ EN/SET GND 6 7 AAT3142 3142.2007.03.1.2 ...
Page 3
... Only one Absolute Maximum Rating should be applied at any one time. 2. Based on long-term current density limitation. 3. Mounted on an FR4 board. 4. Derate 6.25mW/°C above 25°C. 3142.2007.03.1.2 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications 1 4 AAT3142 Value Units - ...
Page 4
... I EN/SET Input Leakage EN/SET 1. The AAT3142 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. Codes 2 through 7 are guaranteed to be within ±15% of stated current level. 3. Current matching is defined as I ...
Page 5
... Efficiency vs. Input Voltage (D1-D2 = 3.5V 3.2V) 100 90 Code Code 32 40 Code 28 30 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Input Voltage (V) 3142.2007.03.1.2 High Efficiency 1X/1.5X/2X Charge Pump = 25°C, unless otherwise noted. A 100 Code Code 28 3. 3.8 3.9 4.0 4.1 4.2 2.9 3.0 3.8 3.9 4.0 4.1 4.2 AAT3142 for White LED Applications Efficiency vs. Input Voltage (D1 = 3.5V 3.3V 3.2V) Code 32 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 Input Voltage (V) 4.1 4.2 5 ...
Page 6
... White LED Applications = 25°C, unless otherwise noted. A EN/SET (2V/div (4V/div) V DIODE (2V/div (100mA/div) EN/SET (2V/div (4V/div) V DIODE (2V/div (100mA/div) AAT3142 Turn- Mode (3x30mA Load) Time (100µs/div) Turn-On to 1.5X Mode (3x30mA Load) Time (100µs/div) 3142.2007.03.1.2 ...
Page 7
... Charge Pump to Load Switch V IN (500mV/div (1V/div) V DIODE (500mV/div (50mA/div) Load Switch to Charge Pump V IN (1V/div (4V/div) V DIODE (500mV/div (50mA/div) AAT3142 (1.5X Mode, 3x30mA Load) Time (5ms/div) (2X Mode, 3x30mA Load) Time (5ms/div) (1.5X Mode, 3x30mA Load) Time (2ms/div) 7 ...
Page 8
... I D (10mA/div (0.5V/div) V LED (20mV/div (0.5V/div (10mA/div (20mV/div (10mA/div (20mV/div) AAT3142 Line Response (1X Mode, 3x30mA Load) Time (1ms/div) Line Response (1X Mode, 3x30mA Load) Time (1ms/div) Load Characteristics (1.5X Mode, 3x30mA Load) Time (1µs/div) 3142.2007.03.1.2 ...
Page 9
... DIODE 0.775 0.750 0.725 0.700 0.675 = 3.4V DIODE 0.650 0.625 0.600 2.5 4.7 5.1 5.5 AAT3142 for White LED Applications Input Current vs. Input Voltage (3x30mA 3.4V DIODE V = 3.0V DIODE 3.1 3.5 3.9 4.3 4.7 5.1 Input Voltage (V) V and V vs 3.0 3.5 4.0 4.5 5.0 Input Voltage (V) 5 ...
Page 10
... S Cwire EN/SET Interface Functional Description The AAT3142 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 source output and sets the ...
Page 11
... Because the outputs are true independent constant current sources, the voltage observed on any single given output will be determined by the actual forward voltage (V ) for the LED being driven. F Since the output current of the AAT3142 is pro- grammable, no PWM (pulse width modulation) or additional control circuitry are needed to control 1.00 0.10 0.01 ...
Page 12
... LED Selection The AAT3142 is specifically intended for driving white LEDs. However, the device design will allow the AAT3142 to drive most types of LEDs with for- ward voltage specifications ranging from 1.0V to 4.3V. LED applications may include main and sub- LCD display backlighting, camera photo-flash appli- ...
Page 13
... The charge pump efficiency discussion in the follow- ing sections only accounts for efficiency of the charge pump section itself. Due to the unique circuit architecture and design of the AAT3142 very dif- ficult to measure efficiency in terms of a percent value comparing input power over output power. ...
Page 14
... IN equal value capacitor in a smaller package size. Thermal Protection The AAT3142 has a thermal protection circuit that will shut down the charge pump if the die temperature rises above the thermal limit the case during a short-circuit of the CP pin. ...
Page 15
... XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3142.2007.03.1.2 High Efficiency 1X/1.5X/2X Charge Pump Marking 1 Part Number (Tape and Reel) PJXYY AAT3142ITP-T1 TSOPJW-12 0.20 + 0.10 - 0.05 7° NOM 4° ± 4° 0.055 ± 0.045 0.010 AAT3142 for White LED Applications 2 0.04 REF 0.45 ± 0.1 5 2.75 ± 0.25 15 ...
Page 16
... All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737- 4600 Fax (408) 737- 4611 16 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications AAT3142 3142.2007.03.1.2 ...