DATA SHEET AAT3221/AAT3222: 150 mA NanopowerTM LDO Linear Regulator Applications Description • Cellular phones The AAT3221 and AAT3222 NanoPower™ Low Drop Out (LDO) linear regulators are ideal for portable applications where extended battery life is critical. These devices feature extremely low quiescent current, typically 1.1 µA. Dropout voltage is also very low, typically less than 200 mV at the maximum output current of 150 mA. The AAT3221/3222 have an enable pin which, when asserted, places the LDO regulator into shutdown mode, removing power from its load and offering extended power conservation capabilities for portable battery-powered applications. • Digital cameras • Handheld electronics • Notebook computers • PDAs • Portable communication devices • Remote controls Features • Quiescent current: 1.1 µA • Low dropout: 200 mV (typical) • Guaranteed output: 150 mA • High accuracy: ±2% • Current limit protection • Over-temperature protection • Extremely low power shutdown mode • Low temperature coefficient • Factory-programmed output voltages: 1.5 V to 3.5 V • Stable operation with virtually any output capacitor type • Active high or low enable pin • Small, 5-pin SOT23 or 8-pin SC70JW (AAT3221 only) package (MSL1, 260 °C per JEDEC-J-STD-020) The AAT3221/3222 have output short-circuit and over-current protection. In addition, the devices also have an over-temperature protection circuit that shuts down the LDO regulator during extended over-current events. Both devices are available with active high or active low enable input. The AAT3221 and AAT3222 are available in Pb-free, space-saving 5-pin SOT23 packages. The AAT3221 is also available in a Pb-free, 8-pin SC70JW package. Since only a small, 1 µF ceramic output capacitor is recommended, often the only space used is that occupied by the AAT3221 or AAT3222. The AAT3221/3222 provide a compact and cost-effective voltage conversion solution. Both devices are similar to the AAT3220, with the exception that they offer further power savings with an enable pin. A typical application circuit is shown in Figure 1. The pin configuration is shown in Figures 2, 3, and 4. Signal pin assignments and functional pin descriptions are provided in Table 1. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 1 DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 1. AAT3221/3222 Typical Application Circuit Figure 3. AAT3221 Pinout 8-Pin SC70JW-8 (Top View) Figure 2. AAT3221 Pinout 5-Pin SOT23-5 (Top View) Figure 4. AAT3222 Pinout 5-Pin SOT23-5 (Top View) Table 1. AAT3221/3222 Signal Descriptions Pin # AAT3221 AAT3222 SOT23-5 SC70JW-8 1 2 2 2 5, 6, 7, 8 1 Name IN GND EN(EN) Description Input pin. Ground connection pin. Enable input. Logic compatible enable with active high or active low option available; see Ordering Information and Applications Information for details. 3 4 5 4 3 4 NC Not connected. 5 1 3 OUT Output pin; should be decoupled with 1 µF or greater capacitor. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Electrical and Mechanical Specifications Typical performance characteristics of the AAT3221/3222 are illustrated in Figures 5 through 22. The absolute maximum ratings of the AAT3221/3222 are provided in Table 2. The recommended operating conditions are specified in Table 3, and electrical specifications are provided in Table 4. Table 2. AAT3221/3222 Absolute Maximum Ratings (Note 1) Parameter Symbol Minimum Input Voltage, <30 ms, 10% DC (continuous max. = 6.0 V) VIN –0.3 EN(EN) to GND Voltage VEN –0.3 Maximum EN(EN) to Input Voltage VENIN(MAX) Maximum DC Output Current IOUT Operating Junction Temperature Range TJ Thermal Resistance (Note 2) θJA Power Dissipation (Note 2) PD Typical Maximum Units +7 V +6 V 0.3 V PD/(VIN – VO) mA –40 +150 SOT23-5 150 ºC/W SC70JW-8 160 ºC/W SOT23-5 667 mW SC70JW-8 625 mW ESD Electrostatic Discharge: Human Body Model, Class 3A ºC 4000 V Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device. Note 2: Support IN high voltage pulse up to 7 V lasting 8 µs. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Table 3. AAT3221/3222 Recommended Operating Conditions Symbol Minimum Maximum Units Input voltage (Note 1) Parameter VIN (VOUT + VDO) Typical 5.5 V Ambient temperature range TA –40 +85 °C Note 1: To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5 V. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 3 DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Table 4. AAT3221/3222 Electrical Specifications (1 of 2) (Note 1) (VIN = VOUT(NOM) + 1 V, IOUT = 1 mA, COUT = 1 µF, TA = 25 °C, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical DC output voltage tolerance VOUT Output current IOUT VOUT > 1.2 V Short-circuit current ISC VOUT < 0.4 V 350 Ground current IQ VIN = 5 V, no load 1.1 Shutdown current ISD EN = inactive 20 Line regulation ∆Vout/Vout Х ∆Vin VIN = 4.0 V to 5.5 V ∆VOUT/VOUT Load regulation Dropout voltage (Note 2, 3) VDO –2.0 IOUT = 1 to 100 mA IOUT = 100 mA Max +2.0 150 % mA mA 2.5 0.15 0.4 VOUT = 1.5 1.3 1.72 VOUT = 1.6 1.2 1.69 VOUT = 1.7 1.1 1.67 VOUT = 1.8 1.0 1.65 VOUT = 1.9 1.0 1.62 VOUT = 2.0 0.9 1.58 VOUT = 2.3 0.8 1.45 VOUT = 2.4 0.8 1.40 VOUT = 2.5 0.8 1.35 VOUT = 2.6 0.8 1.30 VOUT = 2.7 0.7 1.25 VOUT = 2.8 0.7 1.20 VOUT = 2.85 0.7 1.20 VOUT = 2.9 0.7 1.18 VOUT = 3.0 0.6 1.15 VOUT = 3.1 0.6 1.06 VOUT = 3.3 0.5 1.00 VOUT = 3.5 0.5 1.00 VOUT = 2.3 230 275 VOUT = 2.4 220 265 VOUT = 2.5 210 255 VOUT = 2.6 205 247 VOUT = 2.7 200 240 VOUT = 2.8 190 235 VOUT = 2.85 190 230 VOUT = 2.9 190 228 VOUT = 3.0 190 225 VOUT = 3.1 188 222 VOUT = 3.3 180 220 VOUT = 3.5 180 220 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B µA nA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 Units %/V % mV DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Table 4. AAT3221/3222 Electrical Specifications (2 of 2) (Note 1) (VIN = VOUT(NOM) + 1 V, IOUT = 1 mA, COUT = 1 µF, TA = 25 °C, Unless Otherwise Noted) Parameter EN Input low voltage Symbol Test Condition Min Typical VEN(L) EN Input high voltage VEN(H) VIN = 2.7 V to 3.6 V 2.0 VIN = 5 V 2.4 EN Input leakage IEN(SINK) VON = 5.5 V Power supply rejection ratio PSRR @ 100 HZ Over-temperature shutdown threshold Over-temperature shutdown hysteresis Output noise eN Output voltage temperature coefficient TC Max Units 0.8 V V 0.01 1 µA 50 dB TSD 140 ºC THYS 20 ºC 350 µVRMS 80 PPM/°C f = 10 Hz to 10 kHz Note 1: Performance is guaranteed only under the conditions listed in this Table. Note 2: VDO is defined as VIN - VOUT when VOUT is 98% of nominal. Note 3: For VOUT < 2.3 V, VDO = 2.5 V – VOUT. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 5 DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Typical Performance Characteristics (VIN = VOUT + 1 V, TA = 25 °C, COUT = 5.6 µF Ceramic, IOUT = 1 mA, Unless Otherwise Noted) Figure 5. Output Voltage vs Output Current Figure 6. Output Voltage vs Input Voltage Figure 7. Output Voltage vs Input Voltage Figure 8. Dropout Voltage vs Output Current Figure 9. Supply Current vs Input Voltage Figure 10. PSRR with 10 mA Load Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Typical Performance Characteristics (VIN = VOUT + 1 V, TA = 25 °C, COUT = 5.6 µF Ceramic, IOUT = 1 mA, Unless Otherwise Noted) Figure 11. Noise Spectrum Figure 12. Line Response with 1 mA Load Figure 13. Line Response with 10 mA Load Figure 14. Line Response with 100 mA Load Figure 15. Load Transient – 1 mA/40 mA Figure 16. Load Transient – 1 mA/80 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 7 DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Typical Performance Characteristics (VIN = VOUT + 1 V, TA = 25 °C, COUT = 5.6 µF Ceramic, IOUT = 1 mA, Unless Otherwise Noted) Figure 17. Power-Up with 1 mA Load Figure 18. Turn-On with 1 mA Load Figure 19. Power-Up with 10 mA Load Figure 20. Turn-On with 10 mA Load Figure 21. Power-Up with 100 mA Load Figure 22. Turn-On with 100 mA Load Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 23. AAT3221/3222 Functional Block Diagram Functional Description The AAT3221 and AAT3222 are intended for LDO regulator applications where output current load requirements range from no load to 150 mA. The advanced circuit design of the AAT3221/3222 has been optimized for very low quiescent or ground current consumption, making these devices ideal for use in power management systems for small battery-operated devices. The typical quiescent current level is just 1.1 µA. Both devices also contain an enable circuit that has been provided to shut down the LDO regulator for additional power conservation in portable products. In the shutdown state, the LDO draws less than 1 µA from the input supply. The LDO also demonstrates excellent Power Supply Ripple Rejection (PSRR), and load and line transient response characteristics. The AAT3221/3222 high performance LDO regulators are especially well suited for circuit applications that are sensitive to load circuit power consumption and extended battery life. The LDO regulator output has been specifically optimized to function with low-cost, low Equivalent Series Resistance (ESR) ceramic capacitors. However, the design allows for operation with a wide range of capacitor types. The AAT3221/3222 have complete short-circuit and thermal protection. The integral combination of these two internal protection circuits gives each device 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 and High Output Current Applications section of this document for details on device operation at maximum output load levels. Application Information To ensure that the maximum possible performance is obtained from the AAT3221 or AAT3222, please refer to the following application recommendations. Input Capacitor A 1 µF or larger capacitor is typically recommended for CIN in most applications. A CIN capacitor is not required for basic LDO regulator operation. However, if the AAT3221/3222 are physically located more than one or two centimeters from the input power source, a CIN capacitor is needed for stable operation. CIN should be located as closely to the device VIN pin as practically possible. CIN values greater than 1 µF offer superior input line transient response and helps to maximize the power supply ripple rejection. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CIN, as there is no specific capacitor ESR requirement. For 150 mA 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 9 DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Output Capacitor Equivalent Series Resistance (ESR) 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 made as direct as practically possible for maximum device performance. ESR is a very important characteristic to consider when selecting a capacitor. ESR is the internal series resistance associated with a capacitor, which 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. The AAT3221/3222 have been specifically designed to function with very low ESR ceramic capacitors. Although the devices are intended to operate with these low ESR capacitors, they are stable over a wide range of capacitor ESRs. Therefore, they can 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 0.47 µF to 10 µF; however, 1 µF 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 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: Where: ∆I = maximum step of output current ∆V = maximum excursion 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 AAT3221 or AAT3222 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 AAT3221/3222. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has a very low ESR, a lower cost, a smaller PCB footprint, and is non-polarized. 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. Ceramic Capacitor Materials Ceramic capacitors less than 0.1 µF are typically made from NPO or C0G materials. NPO and C0G materials have a typically tight tolerance and are very stable over temperature ranges. Larger capacitor values are typically composed of X7R, X5R, Z5U, and Y5V dielectric materials. Large ceramic capacitors, typically greater than 2.2 µF, are often available in low-cost Y5V and Z5U dielectrics. These two material types are not recommended for use with LDO regulators since the capacitor tolerance can vary more than ±50% over the operating temperature range of the device. A 2.2 µF, Y5V capacitor could be reduced to 1 µF 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 that are physically large in size 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 Data Sheets carefully when selecting capacitors for use with LDO regulators. Enable Function The AAT3221/3222 devices feature an LDO regulator enable/disable function. This pin (EN) is compatible with CMOS logic. Active high or active low options are available (see Ordering Information). For a logic high signal, the EN control level must be greater than 2.4 V. A logic low signal is asserted when the voltage on the EN pin falls below 0.8 V. For example, the active high versions of the AAT3221 and AAT3222 turns on when a logic high is applied to the EN pin. If the enable function is not needed in a specific application, it may be tied to the respective voltage level to keep the LDO regulator in a continuously “on” state (e.g., the active high version AAT3221/3222 can tie VIN to EN to remain on). Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Short-Circuit Protection and Thermal Protection The AAT3221/2 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 was to continually draw more than the current limit threshold, the LDO regulator output voltage drops to a level necessary to supply the current demanded by the load. Under short-circuit or other over-current operating conditions, the output voltage drops and the device die temperature rapidly increases. Once the regulator’s power dissipation capacity is exceeded and the internal die temperature reaches approximately 140 °C, the system thermal protection circuit becomes active. The internal thermal protection circuit actively turns off the LDO regulator output pass device to prevent the possibility of over-temperature damage. The LDO regulator output remains in a shutdown state until the internal die temperature falls back below the 140 °C trip point. The interaction between the short-circuit and thermal protection systems allows the LDO regulator to withstand indefinite shortcircuit conditions without sustaining permanent damage. No-Load Stability The AAT3221 and AAT3222 are 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 document for recommended typical output capacitor values. Constants for the AAT3221/3222 are TJ(MAX), the maximum junction temperature for the device, which is 125 °C, and QJA = 150 °C/W, the package thermal resistance. Typically, the maximum package power is calculated at the maximum operating temperature where TA = 85 °C, and under normal ambient conditions TA = 25 °C. Given TA = 85 °C, the maximum package power dissipation is 267 mW. At TA = 25 °C, the maximum package power dissipation is 667 mW. The maximum continuous output current for the AAT3221/3222 is a function of the package power dissipation and the input-tooutput voltage drop across the LDO regulator. Refer to the following simple equation: For example, if VIN = 5 V, VOUT = 2.5 V and TA = 25 °C, IOUT(MAX) < 267 mA. The output short-circuit protection threshold is set between 150 mA and 300 mA. If the output load current were to exceed 267 mA 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 would only activate after a short-circuit event occurred on the LDO regulator output. To determine the maximum input voltage for a given 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. This formula can be solved for VIN to determine the maximum input voltage. Thermal Considerations and High Output Current Applications The AAT3221/3222 are designed to deliver a continuous output load current of 150 mA 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. To obtain high operating currents, careful device layout and circuit operating conditions need to be taken into account. The following discussion assumes that the LDO regulator is mounted on a printed circuit board using 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: The following is an example of the AAT3221 or AAT3222 set for a 2.5 V output: VOUT = 2.5 V IOUT = 150 mA IGND = 1.1 µA From the discussion above, PD(MAX) was determined to equal 667 mW at TA = 25 °C. Therefore, the AAT3221/3222 can sustain a constant 2.5 V output at a 150 mA load current as long as VIN ≤ 6.95 V at an ambient temperature of 25 °C. The maximum input operating voltage is 5.5 V for the AAT3221/3222. Therefore, at 25 °C, the device would not have any thermal concerns or operational VIN(MAX) limits. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 11 DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR This situation can be different at 85 °C. The following is an example for an AAT3221/3222 set for a 2.5 V output at 85 °C: VOUT = 2.5 V IOUT = 150 mA IGND = 1.1 µA From the discussion above, PD(MAX) was determined to equal 267 mW at TA = 85 °C. Figure 24: Device Duty Cycle vs Voltage Drop (VOUT = 2.5 V @ 25 °C) Higher input-to-output voltage differentials can be obtained with the AAT3221/3222, while maintaining device functions in the thermal safe operating area. To accomplish 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. For example, an application requires VIN = 5.0 V while VOUT = 2.5 V at a 150 mA load and TA = 85 °C. VIN is greater than 4.28 V, which is the maximum safe continuous input level for VOUT = 2.5 V at 150 mA 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: Figure 25: Device Duty Cycle vs Voltage Drop (VOUT = 2.5 V @ 50 °C) IGND = 1.1 µA IOUT = 150 mA VIN = 5.0 V VOUT = 2.5 V PD(MAX) is assumed to be 267 mW. For a 150 mA output current and a 2.5 V drop across the AAT3221/3222 at an ambient temperature of 85 °C, the maximum on-time duty cycle for the device is 71.2%. The following family of curves shows the safe operating area for duty-cycled operation from ambient room temperature to the maximum operating level. Figure 26: Device Duty Cycle vs Voltage Drop (VOUT = 2.5 V @ 85 °C) High Peak Output Current Applications Some applications require the LDO regulator to operate at continuous nominal levels with short duration, high-current peaks. The duty cycles for both output current levels must be taken into account. To do so, one would first need to calculate the power dissipation at the nominal continuous level, then factor in the additional power dissipation due to the short duration, highcurrent peaks. For example, a 2.5 V system using an AAT3221/2IGV-2.5-T1 operates at a continuous 100 mA load current level and has short 150 mA current peaks. The current peak occurs for 378 µs out of a 4.61 ms period. It will be assumed the input voltage is 5.0 V. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 12 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR First, the current duty cycle percentage must be calculated: % Peak duty cycle: x/100 = 378 µs/4.61 ms % Peak duty cycle = 8.2% The LDO regulator is under the 100 mA load for 91.8% of the 4.61 ms period and have 150 mA peaks occurring for 8.2% of the time. Next, the continuous nominal power dissipation for the 100 mA load should be determined then multiplied by the duty cycle to conclude the actual power dissipation over time. PD(MAX) = (VIN – VOUT) IOUT + (VIN × IGND) PD(100mA) = (5.0 V – 2.5 V) Х 100 mA + (5.0 V × 1.1 μA) PD(100mA) = 250 mW PD(91.8%D/C) = %DC · PD(100mA) PD(91.8%D/C) = 0.918 × 250 mW PD(91.8%D/C) = 229.5 mW The power dissipation for a 100 mA load occurring for 91.8% of the duty cycle is 229.5 mW. Now, the power dissipation for the remaining 8.2% of the duty cycle at the 150 mA load can be calculated: PD(MAX) = (VIN – VOUT) IOUT + (VIN × IGND) PD(150MA) = (5.0 V – 2.5 V) × 150 mA + (5.0 V × 1.1 μA) PD(150mA) = 375 mW PD(8.2%D/C) = %DC × PD(150mA) PD(8.2%D/C) = 0.082 × 375 mW PD(8.2%D/C) = 30.75 mW The power dissipation for a 150 mA load occurring for 8.2% of the duty cycle will be 30.75 mW. Finally, the two power dissipation levels can be summed to determine the total true power dissipation under the varied load: PD(total) = PD(100 mA) + PD(150 mA) PD(total) = 229.5 mW + 30.75 mW PD(total) = 260.25 mW The maximum power dissipation for the AAT3221/3222 operating at an ambient temperature of 85 °C is 267 mW. The device in this example has a total power dissipation of 260.25 mW. This is within the thermal limits for safe operation of the device. Printed Circuit Board Layout Recommendations To obtain the maximum performance from the AAT3221/3222 LDO regulator, very careful attention must be considered 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 AAT3221/3222, 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. Evaluation Board Description The AAT3221 Evaluation Board schematic diagrams are provided in Figures 27 and 28. The PCB layout is illustrated in Figures 29 and 30. Component values for the AAT3221 Evaluation Boards are listed in Tables 5 and 6. Package Information Package dimensions are shown in Figures 31 (SOT23-5) and 33 (SC70JW-8), and tape and reel dimensions are provided in Figures 32 (SOT23-5) and 34 (SC70JW-8). Figure 27: AAT3221 (SOT23-5) Evaluation Board Schematic Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 13 DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 28: AAT3221 (SC70JW-8) Evaluation Board Schematic Figure 29: AAT3221 (SOT23-5) Evaluation Board Figure 30: AAT3221 (SC70JW-8) Evaluation Board Table 5. AAT3221 (SOT23-5) Evaluation Board Bill of Materials (BOM) Component Part Number Description Manufacturer U1 AAT3221IGV-XX-T1 150 mA, NanoPower low dropout linear regulator Skyworks R1 RC0603FR-07100KL Resistor, 100 kΩ, 1/10W, 1%, 0603 SMD Yageo C1, C2 GRM31MR71E105K Cap Ceramic, 1µF, 1206 X7R, 25V, 10% Murata Table 6. AAT3221 (SC70JW-8) Evaluation Board Bill of Materials (BOM) Component Part Number Description Manufacturer U1 AAT3221IJS-XX-T1 150 mA, NanoPower low dropout linear regulator Skyworks R1,R2 RC0603FR-07100KL Resistor, 100 kΩ, 1/10W, 1%, 0603 SMD Yageo C1,C2 GRM31MR71E105K Cap Ceramic, 1µF, 1206 X7R, 25V, 10% Murata Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 14 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 31. AAT3221/3222 5-Pin SOT23-5 Package Dimensions Figure 32. AAT3221/3222 Tape and Reel Dimensions (SOT23-5) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 15 DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 33. AAT3221 8-Pin SC70JW-8 Package Dimensions Figure 34. AAT3221/3222 Tape and Reel Dimensions (SC70JW-8) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 16 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Ordering Information Output Voltage Enable Package Marking (Note 1) Part Number (Tape and Reel) (Note 2) 1.6V GYXYY AAT3221IGV-1.6-T1 1.7V GBXYY AAT3221IGV-1.7-T1 1.8V BBXYY AAT3221IGV-1.8-T1 1.9V CGXYY AAT3221IGV-1.9-T1 2.0V BLXYY AAT3221IGV-2.0-T1 2.3V FLXYY AAT3221IGV-2.3-T1 2.4V FMXYY AAT3221IGV-2.4-T1 AKXYY AAT3221IGV-2.5-T1 2.5V SOT23-5 GPXYY AAT3221IGV-2.6-T1 2.7V GDXYY AAT3221IGV-2.7-T1 2.8V AQXYY AAT3221IGV-2.8-T1 2.85V BYXYY AAT3221IGV-2.85-T1 2.9V JCXYY AAT3221IGV-2.9-T1 2.6V 3.0V ALXYY AAT3221IGV-3.0-T1 3.1V GVXYY AAT3221IGV-3.1-T1 3.3V AMXYY AAT3221IGV-3.3-T1 1.5V CFXYY AAT3221IJS-1.5-T1 1.6V AAT3221IJS-1.6-T1 1.7V AAT3221IJS-1.7-T1 Active high 1.8V BBXYY AAT3221IJS-1.8-T1 1.9V CGXYY AAT3221IJS-1.9-T1 2.0V BLXYY AAT3221IJS-2.0-T1 2.3V FLXYY AAT3221IJS-2.3-T1 2.4V FMXYY AAT3221IJS-2.4-T1 AKXYY AAT3221IJS-2.5-T1 GPXYY AAT3221IJS-2.6-T1 2.7V GDXYY AAT3221IJS-2.7-T1 2.5V 2.6V SC70JW-8 2.8V AQXYY AAT3221IJS-2.8-T1 2.85V BYXYY AAT3221IJS-2.85-T1 2.9V JCXYY AAT3221IJS-2.9-T1 3.0V ALXYY AAT3221IJS-3.0-T1 3.1V GVXYY AAT3221IJS-3.1-T1 3.2V LEXYY AAT3221IJS-3.2-T1 3.3V AMXYY AAT3221IJS-3.3-T1 3.5V BMXYY AAT3221IJS-3.5-T1 2.8V BIXYY SOT23-5 2.9V 2.8V Active low AAT3222IGV-2.8-T1 AAT3222IGV-2.9-T1 CXXYY AAT3221IGV-2.8-2 T1 Note 1: XYY = assembly and date code. Note 2: Sample stock is generally held on part numbers listed in BOLD. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 17 DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Copyright © 2013 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 18 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B