DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator General Description Features The AAT3220 PowerLinear NanoPower low dropout (LDO) linear regulator is ideal for portable applications where extended battery life is critical. This device features extremely low quiescent current, typically 1.1µA. Dropout voltage is also very low, typically less than 225mV at the maximum output current of 150mA. The AAT3220 has output short-circuit and over-current protection. In addition, the device also has an over-temperature protection circuit which will shut down the LDO regulator during extended over-current events. • • • • • • • • The AAT3220 is available in a Pb-free, space-saving SC59 package. The device is rated over the -40°C to +85°C temperature range. Since only a small, 1µF ceramic output capacitor is required, often the only space used is that occupied by the AAT3220 itself. The AAT3220 is truly a compact and cost-effective voltage conversion solution. The AAT3221/2 are similar products for this application, especially when a shutdown mode is required for further power savings. 1.1µA Quiescent Current Low Dropout: 200mV (typ) Guaranteed 150mA Output High Accuracy: ±2.0% Current Limit and Over-Temperature Protection Low Temperature Coefficient Factory-Programmed Output Voltages: 1.8V to 3.5V Stable Operation With Virtually Any Output Capacitor Type • 3-Pin SC59 Package • 4kV ESD Rating Applications • • • • • • • Cellular Phones Digital Cameras Handheld Electronics Notebook Computers PDAs Portable Communication Devices Remote Controls Typical Application INPUT IN AAT3220 OUT OUTPUT GND GND GND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 1 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Pin Descriptions Pin Number Symbol 1 2 3 GND OUT IN Function Ground connection. Output. Should be decoupled with 1µF or greater output capacitor. Input. Should be decoupled with 1µF or greater capacitor. Pin Configuration SC59 (Top View) GND 1 3 OUT 2 IN 2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Absolute Maximum Ratings1 Symbol VIN IOUT TJ TLEAD VESD Description Input Voltage DC Output Current Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec.) ESD Rating2 — HBM Value Units -0.3 to 6 PD / (VIN - VO) -40 to 150 300 4000 V mA Rating Units 200 500 °C/W mW Rating Units (VOUT + VDO) to 5.5 -40 to +85 V °C °C V Thermal Information3 Symbol Description Maximum Thermal Resistance Maximum Power Dissipation QJA PD Recommended Operating Conditions Symbol VIN T Description Input Voltage4 Ambient Temperature Range 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. 2. Human body model is a 100pF capacitor discharged through a 1.5kW resistor into each pin. 3. Mounted on a demo board. 4. To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 3 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Electrical Characteristics VIN = VOUT(NOM) + 1V, IOUT = 1mA, COUT = 1µF, TA = 25°C, unless otherwise noted. Symbol Description Conditions VOUT IOUT ISC IQ DVOUT/VOUT DC Output Voltage Tolerance Output Current Short-Circuit Current Ground Current Line Regulation VOUT > 1.2V VOUT < 0.4V VIN = 5V, No Load VIN = 4.0 to 5.5V DVOUT/VOUT VDO PSRR TSD THYS eN TC Load Regulation IOUT = 1 to 100mA Dropout Voltage1,2 IOUT = 100mA Power Supply Rejection Ratio Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Output Noise Output Voltage Temperature Coefficient 100Hz 10Hz through 10kHz Min Typ -2.0 150 VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT = = = = = = = = = = = = 1.8 2.0 2.7 2.8 2.9 3.0 3.3 2.7 2.8 2.9 3.0 3.3 350 1.1 0.15 1.0 0.9 0.7 0.6 0.5 200 190 180 50 140 20 350 80 Max Units 2.0 % mA 2.5 0.4 1.65 1.60 1.25 1.20 1.18 1.15 1.00 240 235 228 225 220 1. VDO is defined as VIN - VOUT when VOUT is 98% of nominal. 2. For VOUT < 2.3V, VDO = 2.5V - VOUT. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 µA %/V % mV dB °C µV ppm/°C DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Typical Characteristics VIN = VOUT + 1V, TA = 25°C, output capacitor is 1µF ceramic, IOUT = 40mA, unless otherwise noted. Output Voltage vs. Input Voltage 3.03 3.1 3.02 3 Output Voltage (V) Output Voltage (V) Output Voltage vs. Output Current 3.01 -30°C 3 25°C 2.99 80°C 2.98 1mA 2.9 40mA 2.8 2.7 10mA 2.6 2.5 2.97 0 20 40 60 80 2.7 100 Output Current (mA) 3.3 3.5 Dropout Voltage vs. Output Current 3.03 Dropout Voltage (mV) 400 1mA 3.02 10mA 3.01 40mA 3 300 80°C 200 3.5 4 5 4.5 0 5.5 Input Voltage (V) 25°C -30°C 100 2.99 0 25 50 75 100 125 150 Output Current (mA) Supply Current vs. Input Voltage PSRR with 10mA Load 2 60 1.6 80°C PSRR (dB) Input Current with No Load (μA) 3.1 Input Voltage (V) Output Voltage vs. Input Voltage Output Voltage (V) 2.9 25°C 1.2 0.8 -30°C 40 20 0.4 0 0 1 2 3 4 Input Voltage (V) 5 0 1.E+01 6 1.E+02 1.E+03 1.E+04 1.E+05 Frequency (Hz) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 5 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Typical Characteristics VIN = VOUT + 1V, TA = 25°C, output capacitor is 1µF ceramic, IOUT = 40mA, unless otherwise noted. Line Response with 1mA Load 3.8 6 20 3.6 5 3.4 4 3.2 3 3 2 2.8 1 Output Voltage (V) 30 10 0 -10 -20 -30 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 2.6 -200 1.E+06 Frequency (Hz) 600 0 800 Line Response with 100mA Load 6 3.6 5 3.6 5 3.4 4 3.4 4 3.2 3 3.2 3 3 2 3 2 2.8 1 2.8 1 0 200 400 Output Voltage (V) 3.8 2.6 -200 0 800 600 Time (µs) 320 80 Time (ms) 3 Output Voltage (V) 160 2 0 800 0 240 3 160 80 2 320 -1 0 1 2 Time (ms) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 3 0 Output Current (mA) 3 1 600 4 Output Current (mA) 240 0 400 Load Transient (1mA / 80mA) 4 -1 200 Time (µs) Load Transient (1mA / 40mA) 2 0 Input Voltage (V) 6 Input Voltage (V) Output Voltage (V) 400 3.8 2.6 -200 Output Voltage (V) 200 Time (µs) Line Response with 10mA Load 6 0 Input Voltage (V) Noise (dBµV/rt Hz) AAT3220 Noise Spectrum DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Typical Characteristics VIN = VOUT + 1V, TA = 25°C, output capacitor is 1µF ceramic, IOUT = 40mA, unless otherwise noted. Power-Up with 10mA Load Power-Up with 1mA Load 5 4 0 1 -1 Output Voltage (V) Output Voltage (V) 1 4 3 3 2 1 2 0 1 -1 -2 -2 0 -1 0 1 2 Input Voltage (V) 2 2 Input Voltage (V) 3 3 5 4 4 0 -3 Time (ms) -1 0 1 2 -3 Time (ms) Power-Up with 100mA Load 5 4 3 3 2 1 2 0 -1 1 Input Voltage (V) Output Voltage (V) 4 -2 0 -1 0 1 Time (ms) 2 -3 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 7 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Functional Block Diagram IN OUT Over-Current Protection Over-Temp Protection VREF GND Functional Description The AAT3220 is intended for LDO regulator applications where output current load requirements range from no load to 150mA. The advanced circuit design of the AAT3220 has been optimized for minimum quiescent or ground current consumption, making it ideal for use in power management systems for small battery-operated devices. The typical quiescent current level is just 1.1µA. The LDO also demonstrates excellent power supply ripple rejection (PSRR) and load and line transient response characteristics. The AAT3220 is a truly high performance LDO regulator especially well suited for circuit applications which are sensitive to load circuit power consumption and extended battery life. 8 The LDO regulator output has been specifically optimized to function with low cost, low equivalent series resistance (ESR) ceramic capacitors. However, the design will allow for operation with a wide range of capacitor types. The AAT3220 has complete short-circuit and thermal protection. The integral combination of these two internal protection circuits give the AAT3220 a comprehensive safety system to guard against extreme adverse operating conditions. Device power dissipation is limited to the package type and thermal dissipation properties. Refer to the Thermal Considerations section of this datasheet for details on device operation at maximum output load levels. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Applications Information To assure the maximum possible performance is obtained from the AAT3220, please refer to the following application recommendations. Input Capacitor Typically, a 1µF or larger capacitor is recommended for CIN in most applications. A CIN capacitor is not required for basic LDO regulator operation. However, if the AAT3220 is physically located any distance more than one or two centimeters from the input power source, a CIN capacitor will be needed for stable operation. CIN should be located as close to the device VIN pin as practically possible. CIN values greater than 1µF will offer superior input line transient response and will assist in maximizing the highest possible power supply ripple rejection. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CIN. There is no specific capacitor ESR requirement for CIN. For 150mA LDO regulator output operation, ceramic capacitors are recommended for CIN due to their inherent capability over tantalum capacitors to withstand input current surges from low-impedance sources such as batteries in portable devices. Output Capacitor For proper load voltage regulation and operational stability, a capacitor is required between pins VOUT and GND. The COUT capacitor connection to the LDO regulator ground pin should be as direct as practically possible for maximum device performance. The AAT3220 has been specifically designed to function with very low ESR ceramic capacitors. Although the device is intended to operate with low ESR capacitors, it is stable over a very wide range of capacitor ESR, thus it will also work with some higher ESR tantalum or aluminum electrolytic capacitors. However, for best performance, ceramic capacitors are recommended. The value of COUT typically ranges from 0.47µF to 10µF; however, 1µF is sufficient for most operating conditions. If large output current steps are required by an application, then an increased value for COUT should be considered. The amount of capacitance needed can be calculated from the step size of the change in the output load current expected and the voltage excursion that the load can tolerate. The total output capacitance required can be calculated using the following formula: COUT = ∆I ∙ 15µF ∆V Where: DI = maximum step in output current DV = maximum excursion in voltage that the load can tolerate. Note that use of this equation results in capacitor values approximately two to four times the typical value needed for an AAT3220 at room temperature. The increased capacitor value is recommended if tight output tolerances must be maintained over extreme operating conditions and maximum operational temperature excursions. If tantalum or aluminum electrolytic capacitors are used, the capacitor value should be increased to compensate for the substantial ESR inherent to these capacitor types. Capacitor Characteristics Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT3220. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is lower cost, has a smaller PCB footprint, and is nonpolarized. Line and load transient response of the LDO regulator is improved by using low ESR ceramic capacitors. Since ceramic capacitors are non-polarized, they are less prone to damage if incorrectly connected. Equivalent Series Resistance: ESR is a very important characteristic to consider when selecting a capacitor. ESR is the internal series resistance associated with a capacitor that includes lead resistance, internal connections, capacitor size and area, material composition, and ambient temperature. Typically, capacitor ESR is measured in milliohms 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 composed of X7R, X5R, Z5U, or Y5V dielectric materials. Large ceramic capacitors (i.e., greater than 2.2µF) are often available in lowcost Y5V and Z5U dielectrics. These two material types are not recommended for use with LDO regulators since the capacitor tolerance can vary by more than ±50% over the operating temperature range of the device. A Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 9 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator 2.2µF Y5V capacitor could be reduced to 1µF over the full operating temperature range. This can cause problems for circuit operation and stability. X7R and X5R dielectrics are much more desirable. The temperature tolerance of X7R dielectric is better than ±15%. Capacitor area is another contributor to ESR. Capacitors, which are physically large in size will have a lower ESR when compared to a smaller sized capacitor of equivalent material and capacitance value. These larger devices can also improve circuit transient response when compared to an equal value capacitor in a smaller package size. Consult capacitor vendor datasheets carefully when selecting capacitors for use with LDO regulators. Short-Circuit and Thermal Protection The AAT3220 is protected by both current limit and overtemperature protection circuitry. The internal short-circuit current limit is designed to activate when the output load demand exceeds the maximum rated output. If a short-circuit condition were to continually draw more than the current limit threshold, the LDO regulator’s output voltage would drop to a level necessary to supply the current demanded by the load. Under short-circuit or other over-current operating conditions, the output voltage would drop and the AAT3220’s die temperature would increase rapidly. Once the regulator’s power dissipation capacity has been exceeded and the internal die temperature reaches approximately 140°C the system thermal protection circuit will become active. The internal thermal protection circuit will actively turn off the LDO regulator output pass device to prevent the possibility of over-temperature damage. The LDO regulator output will remain in a shutdown state until the internal die temperature falls back below the 120°C trip point. The combination and interaction between the short-circuit and thermal protection systems allows the LDO regulator to withstand indefinite short-circuit conditions without sustaining permanent damage. No-Load Stability The AAT3220 is designed to maintain output voltage regulation and stability under operational no-load conditions. This is an important characteristic for applications where the output current may drop to zero. An output capacitor is required for stability under no-load operating conditions. Refer to the Output Capacitor section of this datasheet for recommended typical output capacitor values. 10 Thermal Considerations and High Output Current Applications The AAT3220 is designed to deliver a continuous output load current of 150mA under normal operating conditions. The limiting characteristic for the maximum output load safe operating area is essentially package power dissipation and the internal preset thermal limit of the device. In order to obtain high operating currents, careful device layout and circuit operating conditions need to be taken into account. The following discussions will assume the LDO regulator is mounted on a printed circuit board utilizing the minimum recommended footprint and the printed circuit board is 0.062 inch thick FR4 material with one ounce copper. At any given ambient temperature (TA), the maximum package power dissipation can be determined by the following equation: PD(MAX) = TJ(MAX) - TA ΘJA Constants for the AAT3220 are TJ(MAX), the maximum junction temperature for the device which is 125°C and QJA = 200°C/W, the package thermal resistance. Typically, maximum conditions are calculated at the maximum operating temperature where TA = 85°C; under normal ambient conditions TA = 25°C. Given TA = 85°C, the maximum package power dissipation is 200mW. At TA = 25°C, the maximum package power dissipation is 500mW. The maximum continuous output current for the AAT3220 is a function of the package power dissipation and the input-to-output voltage drop across the LDO regulator. Refer to the following simple equation: IOUT(MAX) < PD(MAX) VIN - VOUT For example, if VIN = 5V, VOUT = 3V and TA = 25°C, IOUT(MAX) < 250mA. The output short-circuit protection threshold is set between 150mA and 300mA. If the output load current were to exceed 250mA or if the ambient temperature were to increase, the internal die temperature would increase. If the condition remained constant and the short-circuit protection did not activate, there would be a potential damage hazard to the LDO regulator since the thermal protection circuit will only activate after a shortcircuit event occurs on the LDO regulator output. To determine the maximum input voltage for a given Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator load current, refer to the following equation. This calculation accounts for the total power dissipation of the LDO regulator, including that caused by ground current. plish this, the device thermal resistance must be reduced by increasing the heat sink area or by operating the LDO regulator in a duty-cycled mode. PD(MAX) = (VIN - VOUT)IOUT + (VIN ⋅ IGND) For example, an application requires VIN = 5.0V while VOUT = 3.0V at a 150mA load and TA = 85°C. VIN is greater than 4.33V, which is the maximum safe continuous input level for VOUT = 3.0V at 150mA for TA = 85°C. To maintain this high input voltage and output current level, the LDO regulator must be operated in a duty-cycled mode. Refer to the following calculation for duty-cycle operation: This formula can be solved for VIN to determine the maximum input voltage. VIN(MAX) = PD(MAX) + (VOUT ∙ IOUT) IOUT + IGND The following is an example for an AAT3220 set for a 3.0V output: IGND = 1.1µA VOUT = 3.0V IOUT = 150mA IOUT = 150mA VIN = 5.0V IGND = 1.1µA VOUT = 3.0V VIN(MAX) = 500mW + (3.0V ∙ 150mA) 150mA + 1.1µA VIN(MAX) = 6.33V From the discussion above, PD(MAX) was determined to equal 500mW at TA = 25°C. Thus, the AAT3220 can sustain a constant 3.0V output at a 150mA load current as long as VIN is ≤ 6.33V at an ambient temperature of 25°C. 5.5V is the maximum input operating voltage for the AAT3220, thus at 25°C, the device would not have any thermal concerns or operational VIN(MAX) limits. %DC = %DC = PD(MAX) (VIN - VOUT) ∙ IOUT + (VIN ∙ IGND) 200mW (5.0V - 3.0V) ∙ 150mA + (5.0V ∙ 1.1µA) %DC = 66.67% PD(MAX) is assumed to be 200mW. For a 150mA output current and a 2.0V drop across the AAT3220 at an ambient temperature of 85°C, the maximum on-time duty cycle for the device would be 66.67%. This situation can be different at 85°C. The following is an example for an AAT3220 set for a 3.0V output at 85°C: VOUT = 3.0V IOUT = 150mA IGND = 1.1µA VIN(MAX) = 200mW + (3.0V ∙ 150mA) 150mA + 1.1µA VIN(MAX) = 4.33V From the discussion above, PD(MAX) was determined to equal 200mW at TA = 85°C. Higher input-to-output voltage differentials can be obtained with the AAT3220 while maintaining device functions in the thermal safe operating area. To accom- Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 11 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator The following family of curves shows the safe operating area for duty-cycled operation from ambient room temperature to the maximum operating level. Device Duty Cycle vs. VDROP (VOUT = 3.0V @ 25°C) Voltage Drop (V) 3.5 3 2.5 2 200mA 1.5 1 0.5 0 0 10 20 30 40 50 60 70 80 90 100 High Peak Output Current Applications Some applications require the LDO regulator to operate at continuous nominal levels with short duration, highcurrent peaks. The duty cycles for both output current levels must be taken into account. To do so, first calculate the power dissipation at the nominal continuous level, then factor in the addition power dissipation due to the short duration, high-current peaks. For example, a 3.0V system using a AAT3220IGY-3.0-T1 operates at a continuous 100mA load current level and has short 150mA current peaks. The current peak occurs for 378µs out of a 4.61ms period. It will be assumed the input voltage is 4.2V. First, the current duty cycle percentage must be calculated: Duty Cycle (%) Device Duty Cycle vs. VDROP % Peak Duty Cycle: X/100 = 378µs/4.61ms % Peak Duty Cycle = 8.2% (VOUT = 3.0V @ 50°C) Voltage Drop (V) 3.5 3 The LDO regulator will be under the 100mA load for 91.8% of the 4.61ms period and have 150mA peaks occurring for 8.2% of the time. Next, the continuous nominal power dissipation for the 100mA load should be determined then multiplied by the duty cycle to conclude the actual power dissipation over time. 2.5 2 200mA 1.5 150mA 1 0.5 0 0 10 20 30 40 50 60 70 80 90 100 Duty Cycle (%) PD(91.8%D/C) = %DC · PD(100mA) PD(91.8%D/C) = 0.918 · 120mW PD(91.8%D/C) = 110.2mW Device Duty Cycle vs. VDROP (VOUT = 3.0V @ 85°C) Voltage Drop (V) 3.5 PD(MAX) = (VIN - VOUT)IOUT + (VIN · IGND) PD(100mA) = (4.2V - 3.0V) · 100mA + (4.2V · 1.1µA) PD(100mA) = 120mW 100mA 3 The power dissipation for 100mA load occurring for 91.8% of the duty cycle will be 110.2mW. Now the power dissipation for the remaining 8.2% of the duty cycle at the 150mA load can be calculated: 2.5 2 1.5 200mA 1 150mA 0.5 0 0 10 20 30 40 50 60 Duty Cycle (%) 70 80 90 100 PD(MAX) = (VIN - VOUT)IOUT + (VIN · IGND) PD(150mA) = (4.2V - 3.0V) · 150mA + (4.2V · 1.1µA) PD(150mA) = 180mW PD(8.2%D/C) = %DC · PD(150mA) PD(8.2%D/C) = 0.082 · 180mW PD(8.2%D/C) = 14.8mW 12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator The power dissipation for a 150mA load occurring for 8.2% of the duty cycle will be 14.8mW. Finally, the two power dissipation levels can be summed to determine the total power dissipation under the varied load. PD(total) = PD(100mA) + PD(150mA) PD(total) = 110.2mW + 14.8mW PD(total) = 125.0mW The maximum power dissipation for the AAT3220 operating at an ambient temperature of 85°C is 200mW. The device in this example will have a total power dissipation of 125.0mW. This is well within the thermal limits for safe operation of the device. Printed Circuit Board Layout Recommendations In order to obtain the maximum performance from the AAT3220 LDO regulator, very careful attention must be paid in regard to the printed circuit board layout. If grounding connections are not properly made, power supply ripple rejection and LDO regulator transient response can be compromised. The LDO regulator external capacitors CIN and COUT should be connected as directly as possible to the ground pin of the LDO regulator. For maximum performance with the AAT3220, the ground pin connection should then be made directly back to the ground or common of the source power supply. If a direct ground return path is not possible due to printed circuit board layout limitations, the LDO ground pin should then be connected to the common ground plane in the application layout. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 13 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Ordering Information Output Voltage Package Marking1 Part Number (Tape and Reel)2 1.8V 2.0V 2.7V 2.8V 2.9V 3.0V 3.3V SC59 SC59 SC59 SC59 SC59 SC59 SC59 BAXYY EZXYY AEXYY AFXYY AAT3220IGY-1.8-T1 AAT3220IGY-2.0-T1 AAT3220IGY-2.7-T1 AAT3220IGY-2.8-T1 AAT3220IGY-2.9-T1 AAT3220IGY-3.0-T1 AAT3220IGY-3.3-T1 AIXYY AJXYY Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Package Information SC59 2.80 ± 0.20 1.575 ± 0.125 2.85 ± 0.15 0.95 BSC 0.40 ± 0.10 × 3 0.45 ± 0.15 0.14 ± 0.06 4° ± 4° 1.20 ± 0.30 0.075 ± 0.075 1.90 BSC All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on all part numbers listed in BOLD. 14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 DATA SHEET AAT3220 150mA NanoPowerTM LDO Linear Regulator Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202250A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012 15