AAT3221_08 ANALOGICTECH | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 16

Technical content

Features

  • 1.1 μA Quiescent Current
  • Low Dropout: 200mV (typical)
  • Guaranteed 150mA Output
  • High Accuracy: ±2%
  • Current Limit Protection
  • Over-Temperature Protection
  • Extremely Low Power Shutdown Mode
  • Low Temperature Coefficient
  • Factory-Programmed Output Voltages ▪ 1.5V to 3.5V
  • Stable Operation With Virtually Any Output Capacitor Type
  • Active High or Low Enable Pin
  • 4kV ESD
  • 5-Pin SOT23 or 8-Pin SC70JW Package
  • -40°C to +85°C Temperature Range

Applications

  • Cellular Phones
  • Digital Cameras
  • Handheld Electronics
  • Notebook Computers
  • PDAs
  • Portable Communication Devices
  • Remote Controls Typical Application AAT3221/2 IN EN INPUT GND OUT OUTPUT GNDGND ENABLE (ENABLE)CIN 1μF COUT 1μF (EN)

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET AAT3221/2 150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET Pin Descriptions Pin # Symbol Function AAT3221 AAT3222SOT23-5 SC70JW-8 1 2 2 IN Input pin. 2 5, 6, 7, 8 1 GND Ground connection pin. 34 5 EN (EN) Enable input. Logic compatible enable with active high or active low option available; see Ordering Information and Applications Information for details. 4 3 4 NC Not connected. 5 1 3 OUT Output pin; should be decoupled with 1 μF or greater capacitor. Pin Configuration AAT3221 AAT3221 AAT3222 SOT23-5 SC70JW-8 SOT23-5 (Top View) (Top View) (Top View) GND OUT NC(EN) EN IN 1 3 4 IN NC (EN) EN GND GND GND GND OUT 1 IN EN (EN) NCOUT GND 1 3 4

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET AAT3221/2 150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Symbol Description Value Units VIN Input Voltage, <30ms, 10% DC (continuous max = 6.0V) -0.3 to 7 V VEN EN (EN) to GND Voltage -0.3 to 6 V VENIN(MAX) Maximum EN (EN) to Input Voltage 0.3 V IOUT Maximum DC Output Current P D/(VIN-VO)m A TJ Operating Junction Temperature Range -40 to 150 °C Thermal Information2 Symbol Description Value Units ΘJA Thermal Resistance 150 °C/W PD Power Dissipation 667 mW Recommended Operating Conditions Symbol Description Rating Units VIN Input Voltage3 (VOUT + VDO) to 5.5 V T Ambient Temperature Range -40 to +85 °C 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at c onditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on a demo board. 3. To calculate minimum input voltage, use the following equation: V IN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5V.

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET AAT3221/2 150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET

Electrical Characteristics

VIN = VOUT(NOM) + 1V, IOUT = 1mA, COUT = 1μF, TA = 25°C, unless otherwise noted. Symbol Description Conditions Min Typ Max Units VOUT DC Output Voltage Tolerance -2.0 2.0 % IOUT Output Current V OUT > 1.2V 150 mA ISC Short-Circuit Current V OUT < 0.4V 350 mA IQ Ground Current V IN = 5V, No Load 1.1 2.5 μA ISD Shutdown Current EN = Inactive 20 nA ΔVOUT/VOUT*ΔVIN Line Regulation V IN = 4.0V to 5.5V 0.15 0.4 %/V ΔVOUT/VOUT Load Regulation I L = 1 to 100mA 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 VDO Dropout Voltage1, 2 IOUT = 100mA VOUT = 2.3 230 275 mV 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 VEN(L) EN Input Low Voltage 0.8 V VEN(H) EN Input High Voltage VIN = 2.7V to 3.6V 2.0 VVIN = 5V 2.4 IEN(SINK) EN Input Leakage V ON = 5.5V 0.01 1 μA PSRR Power Supply Rejection Ratio 100Hz 50 dB TSD Over-Temperature Shutdown Threshold 140 °C THYS Over-Temperature Shutdown Hysteresis 20 °C eN Output Noise 350 μVRMS TC Output Voltage Temperature Coeffi cient 80 PPM/°C 1. VDO is defined as VIN - VOUT when VOUT is 98% of nominal. 2. For VOUT < 2.3V, VDO = 2.5V - VOUT.

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET AAT3221/2 150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET Typical Characteristics Unless otherwise noted, VIN = VOUT + 1V, TA = 25°C, COUT = 5.6μF Ceramic, IOUT = 100mA. Output Voltage vs. Output Current 2.97 2.98 2.99 3.01 3.02 3.03 02 0 4 0 6 0 8 0 1 0 0 Output Current (mA) Output Voltage (V) 80°C 25°C -30°C Output Voltage vs. Input Voltage 2.5 2.6 2.7 2.8 2.9 3.1 Input Voltage (V) Output Voltage (V) 1mA 10mA 40mA Output Voltage vs. Input Voltage 2.99 3.01 3.02 3.03 3.5 4 4.5 5 5.5 Input Voltage (V) Output Voltage (V) 1mA 10mA 40mA Dropout Voltage vs. Output Current 100 200 300 400 02 5 5 0 7 5 1 0 0 1 2 5 1 5 0 Output Current (mA) Dropout Voltage (mV) 80°C -30°C 25°C Supply Current vs. Input Voltage 2.0 1.6 1.2 0.8 0.4 01 234 56 Input Voltage (V) Input Current (µA) with No Load 25°C 80°C -30°C PSRR with 10mA Load Frequency (Hz) PSRR (dB)

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET AAT3221/2 150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET Typical Characteristics Unless otherwise noted, VIN = VOUT + 1V, TA = 25°C, COUT = 5.6μF Ceramic, IOUT = 100mA. Noise Spectrum -30 -20 -10 Frequency (Hz) Noise (dB μV/rt Hz) Line Response with 1mA Load 2.6 2.8 3.2 3.4 3.6 3.8 -200 0 200 400 600 800 Time (µs) Output Voltage (V) Input Voltage (V)Input Output Line Response with 10mA Load 2.6 2.8 3.2 3.4 3.6 3.8 -200 0 200 400 600 800 Time (µs) Output Voltage (V) Input Output Input Voltage (V) Line Response with 100mA Load 2.6 2.8 3.2 3.4 3.6 3.8 -200 0 200 400 600 800 Time (µs) Output Voltage (V) Input Output Input Voltage (V) Load Transient - 1mA / 40mA -1 0 1 2 3 Time (ms) Output Voltage (V) 160 240 320 Output Current (mA) Output Load Transient - 1mA / 80mA -1 0 1 2 3 Time (ms) Output Voltage (V) 160 240 320 Output Current (mA) Output

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET AAT3221/2 150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET Typical Characteristics Unless otherwise noted, VIN = VOUT + 1V, TA = 25°C, COUT = 5.6μF Ceramic, IOUT = 100mA. Power-Up with 1mA Load -1 0 1 2 Time (ms) Output Voltage (V) Input Voltage (V) Output Enable Turn-On with 1mA Load -1 0 1 2 Time (ms) Enable (V) Output Enable Output Voltage (V) Power-Up with 10mA Load -1 0 1 2 Time (ms) Output Enable Output Voltage (V) Input Voltage (V) Turn-On with 10mA Load -1 0 1 2 Time (ms) Enable (V) Output Enable Output Voltage (V) Power-Up with 100mA Load -1 0 1 2 Time (ms) Output Enable Output Voltage (V) Input Voltage (V) Turn-On with 100mA Load -1 0 1 2 Time (ms) Enable (V) Output Enable Output Voltage (V)

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET Functional Description The AAT3221 and AAT3222 are intended for LDO regula- tor applications where output current load requirements range from no load to 150mA. The advanced circuit design of the AAT3221/2 has been optimized for very low 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 1.1 μA. AAT3221/2 devices also contain an enable circuit which has been provided to shut down the LDO regulator for additional power conservation in por- table products. In the shutdown state, the LDO draws less than 1μA from input supply. The LDO also demonstrates excellent power supply rip- ple rejection (PSRR) and load and line transient response characteristics. The AAT3221/2 high performance LDO regulator is 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-ESR ceramic capacitors. However, the design will allow for operation with a wide range of capacitor types. The AAT3221/2 has complete short-circuit and thermal protection. The integral combination of these two inter- nal protection circuits gives the AAT3221/2 a compre- hensive 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 docu- ment for details on device operation at maximum output load levels. Functional Block Diagram Over-Current Protection Over-Temperature Protection VREF IN EN OUT GND

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET Applications Information To ensure that the maximum possible performance is obtained from the AAT3221/2, please refer to the follow- ing application recommendations. Input Capacitor A 1μF or larger capacitor is typically recommended for CIN in most applications. A C IN capacitor is not required for basic LDO regulator operation. However, if the AAT3221/2 is physically located any distance more than one or two centimeters from the input power source, a C IN capacitor will be needed for stable operation. C IN should be located as closely to the device V IN pin as practically possible. C IN values greater than 1 μF will offer superior input line transient response and will assist in maximizing the power supply ripple rejection. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for C IN, as there is no specific capacitor ESR requirement. For 150mA LDO regulator output operation, ceramic capacitors are recommended for C IN 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 sta- bility, a capacitor is required between pins V OUT and GND. The C OUT capacitor connection to the LDO regulator ground pin should be made as direct as practically pos- sible for maximum device performance. The AAT3221/2 has been specifically designed to function with very low ESR ceramic capacitors. Although the device is intended to operate with these low ESR capacitors, it is stable over a 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 C OUT typically ranges from 0.47 μF to 10μF; however, 1μF is sufficient for most operating conditions. If large output current steps are required by an applica- tion, then an increased value for C OUT should be consid- ered. The amount of capacitance needed can be calcu- lated 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: COUT = · 15µFΔI ΔV Where: ΔI = maximum step in output current ΔV = 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 AAT3221/2 at room temperature. The increased capacitor value is recommended if tight output toler- ances must be maintained over extreme operating con- ditions and maximum operational temperature excur- sions. 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 recommend- ed over all other types of capacitors for use with the AAT3221/2. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counter- parts. A ceramic capacitor typically has very low ESR, is lower cost, has a smaller PCB footprint, and is non- polarized. Line and load transient response of the LDO regulator is improved by using low-ESR ceramic capaci- tors. Since ceramic capacitors are non-polarized, they are less prone to damage if incorrectly connected. Equivalent Series Resistance (ESR) ESR is a very important characteristic to consider when selecting a capacitor. ESR is the internal series resis- tance 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. Ceramic Capacitor Materials Ceramic capacitors less than 0.1 μF are typically made from NPO or C0G materials. NPO and C0G materials are typically tight tolerance and very stable over tempera- ture. Larger capacitor values are typically composed of

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET X7R, X5R, Z5U, and Y5V dielectric materials. Large ceramic capacitors, typically greater than 2.2μF, 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 will have a lower ESR when compared to a smaller sized capacitor of equiva- lent material and capacitance value. These larger devic- es can also improve circuit transient response when compared to an equal value capacitor in a smaller pack- age size. Consult capacitor vendor datasheets carefully when selecting capacitors for use with LDO regulators. Enable Function The AAT3221/2 features an LDO regulator enable / dis- able 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 volts. A logic low signal is asserted when the voltage on the EN pin falls below 0.6 volts. For example, the active high version AAT3221/2 will turn on when a logic high is applied to the EN pin. If the enable function is not needed in a spe- cific 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 AAT3221/2 will tie V IN to EN to remain on. Short-Circuit Protection and Thermal Protection The AAT3221/2 is protected by both current limit and over-temperature 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 out- put voltage will drop to a level necessary to supply the current demanded by the load. Under short-circuit or other over-current operating conditions, the output volt- age will drop and the AAT3221/2 die temperature will rapidly increase. Once the regulator’s power dissipation capacity has been exceeded and the internal die tem- perature reaches approximately 140°C, the system ther- mal 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 tem- perature falls back below the 140°C trip point. The interaction between the short-circuit and thermal protection systems allows the LDO regulator to with- stand indefinite short-circuit conditions without sustain- ing permanent damage. No-Load Stability The AAT3221/2 is designed to maintain output voltage regulation and stability under operational no-load condi- tions. 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 considerations section of this document for recommended typical out- put capacitor values. Thermal Considerations and High Output Current Applications The AAT3221/2 is designed to deliver a continuous out- put load current of 150mA under normal operating con- ditions. 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 foot- print and the printed circuit board is 0.062-inch thick FR4 material with one ounce copper. At any given ambient temperature (T A), the maximum package power dissipation can be determined by the fol- lowing equation: PD(MAX) = TJ(MAX) - TA θJA Constants for the AAT3221/2 are T J(MAX), the maximum junction temperature for the device which is 125°C and Θ JA = 150°C/W, the package thermal resistance. Typically,

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET maximum conditions are calculated at the maximum operating temperature where T A = 85°C, under normal ambient conditions T A = 25°C. Given T A = 85°C, the maximum package power dissipation is 267mW. At T A = 25°C, the maximum package power dissipation is 667mW. The maximum continuous output current for the AAT3221/2 is a function of the package power dissipa- tion 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 V IN = 5V, V OUT = 2.5V and T A = 25°C, IOUT(MAX) < 267mA. The output short-circuit protection threshold is set between 150mA and 300mA. If the out- put load current were to exceed 267mA or if the ambient temperature were to increase, the internal die tempera- ture 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 regula- tor since the thermal protection circuit would only acti- vate after a short-circuit event occured on the LDO regulator output. To determine the maximum input voltage for a given load current, refer to the following equation. This calcu- lation accounts for the total power dissipation of the LDO regulator, including that caused by ground current. PD(MAX) = (VIN - VOUT)IOUT + (VIN · IGND) This formula can be solved for V IN to determine the maximum input voltage. VIN(MAX) = (PD(MAX) + [VOUT · IOUT]) (IOUT + IGND) The following is an example for an AAT3221/2 set for a 2.5 volt output: VOUT = 2.5 volts IOUT = 150mA IGND = 1.1μA VIN(MAX) = VIN(MAX) = 6.95V (150mA + 1.1µA) From the discussion above, P D(MAX) was determined to equal 667mW at T A = 25°C. Thus, the AAT3221/2 can sustain a constant 2.5V output at a 150mA load current as long as V IN is ≤6.95V at an ambient temperature of 25°C. 5.5V is the maximum input operating voltage for the AAT3221/2, thus at 25°C the device would not have any thermal concerns or operational V IN(MAX) limits. This situation can be different at 85°C. The following is an example for an AAT3221/2 set for a 2.5 volt output at 85°C: V OUT = 2.5 volts IOUT = 150mA IGND = 1.1μA VIN(MAX) = VIN(MAX) = 4.28V (150mA + 1.1µA) From the discussion above, P D(MAX) was determined to equal 267mW at TA = 85°C. Higher input-to-output voltage differentials can be obtained with the AAT3221/2, while maintaining device functions in the thermal safe operating area. To accom- 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. For example, an application requires V IN = 5.0V while VOUT = 2.5V at a 150mA load and T A = 85°C. V IN is greater than 4.28V, which is the maximum safe continu- ous input level for V OUT = 2.5V 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: I GND = 1.1μA IOUT = 150mA VIN = 5.0 volts VOUT = 2.5 volts %DC = 100 PD(MAX) ([VIN - VOUT]IOUT + [VIN · IGND]) %DC = 100 %DC = 71.2% 267mW PD(MAX) is assumed to be 267mW.

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET For a 150mA output current and a 2.5 volt drop across the AAT3221/2 at an ambient temperature of 85°C, the maximum on-time duty cycle for the device would be 71.2%. The following family of curves shows the safe operating area for duty-cycled operation from ambient room tem- perature to the maximum operating level. Device Duty Cycle vs. VDROP 0.5 1.5 2.5 3.5 0 1 0 2 03 0 4 05 06 0 7 08 0 9 0 1 0 0 Duty Cycle (%) Voltage Drop (V) 200mA (VOUT = 2.5V @ 25°C) Device Duty Cycle vs. VDROP (VOUT = 2.5V @ 50°C) 0.5 1.5 2.5 3.5 0 1 02 03 04 05 06 07 08 09 0 1 0 0 Duty Cycle (%) Voltage Drop (V) 200mA 150mA Device Duty Cycle vs. VDROP (VOUT = 2.5V @ 85°C) 0.5 1.5 2.5 3.5 0 1 02 03 04 05 06 07 08 09 0 1 0 0 Duty Cycle (%) Voltage Drop (V) 200mA 150mA 100mA 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 nom- inal continuous level, then factor in the addition power dissipation due to the short duration, high-current peaks. For example, a 2.5V system using an AAT3221/ 2IGV-2.5-T1 operates at a continuous 100mA load cur- rent level and has short 150mA current peaks. The cur- rent peak occurs for 378 μs out of a 4.61ms period. It will be assumed the input voltage is 5.0V. First, the current duty cycle percentage must be calculated: % Peak Duty Cycle: X/100 = 378ms/4.61ms % Peak Duty Cycle = 8.2% 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. PD(MAX) = (VIN - VOUT)IOUT + (VIN · IGND) PD(100mA) = 250mW PD(91.8%D/C) = %DC · PD(100mA) PD(91.8%D/C) = 229.5mW The power dissipation for a 100mA load occurring for 91.8% of the duty cycle will be 229.5mW. Now the power dissipation for the remaining 8.2% of the duty cycle at the 150mA load can be calculated: PD(MAX) = (VIN - VOUT)IOUT + (VIN · IGND) PD(150mA) = 375mW PD(8.2%D/C) = %DC · PD(150mA) PD(8.2%D/C) = 30.75mW

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET The power dissipation for a 150mA load occurring for 8.2% of the duty cycle will be 20.9mW. Finally, the two power dissipation levels can summed to determine the total true power dissipation under the varied load: PD(total) = PD(100mA) + PD(150mA) PD(total) = 229.5mW + 30.75mW PD(total) = 260.25mW The maximum power dissipation for the AAT3221/2 operating at an ambient temperature of 85°C is 267mW. The device in this example will have a total power dis- sipation of 260.25mW. This is within the thermal limits for safe operation of the device. Printed Circuit Board Layout Recommendations In order to obtain the maximum performance from the AAT3221/2 LDO regulator, very careful attention must be considered in regard to the printed circuit board lay- out. If grounding connections are not properly made, power supply ripple rejection and LDO regulator tran- sient response can be compromised. The LDO regulator external capacitors C IN and C OUT should be connected as directly as possible to the ground pin of the LDO regulator. For maximum performance with the AAT3221/2, 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 limita- tions, the LDO ground pin should then be connected to the common ground plane in the application layout.

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET AAT3221/2 150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET

Ordering Information

Output Voltage Enable Package Marking 1 Part Number (Tape and Reel)2 1.6V Active high SOT23-5 GYXYY AAT3221IGV-1.6-T1 1.7V Active high SOT23-5 GBXYY AAT3221IGV-1.7-T1 1.8V Active high SOT23-5 BBXYY AAT3221IGV-1.8-T1 1.9V Active high SOT23-5 CGXYY AAT3221IGV-1.9-T1 2.0V Active high SOT23-5 BLXYY AAT3221IGV-2.0-T1 2.3V Active high SOT23-5 FLXYY AAT3221IGV-2.3-T1 2.4V Active high SOT23-5 FMXYY AAT3221IGV-2.4-T1 2.5V Active high SOT23-5 AKXYY AAT3221IGV-2.5-T1 2.6V Active high SOT23-5 GPXYY AAT3221IGV-2.6-T1 2.7V Active high SOT23-5 GDXYY AAT3221IGV-2.7-T1 2.8V Active high SOT23-5 AQXYY AAT3221IGV-2.8-T1 2.85V Active high SOT23-5 BYXYY AAT3221IGV-2.85-T1 2.9V Active high SOT23-5 JCXYY AAT3221IGV-2.9-T1 3.0V Active high SOT23-5 ALXYY AAT3221IGV-3.0-T1 3.1V Active high SOT23-5 GVXYY AAT3221IGV-3.1-T1 3.3V Active high SOT23-5 AMXYY AAT3221IGV-3.3-T1 3.5V Active high SOT23-5 BMXYY AAT3221IGV-3.5-T1 1.5V Active high SC70JW-8 CFXYY AAT3221IJS-1.5-T1 1.6V Active high SC70JW-8 AAT3221IJS-1.6-T1 1.7V Active high SC70JW-8 AAT3221IJS-1.7-T1 1.8V Active high SC70JW-8 BBXYY AAT3221IJS-1.8-T1 1.9V Active high SC70JW-8 CGXYY AAT3221IJS-1.9-T1 2.0V Active high SC70JW-8 BLXYY AAT3221IJS-2.0-T1 2.3V Active high SC70JW-8 FLXYY AAT3221IJS-2.3-T1 2.4V Active high SC70JW-8 FMXYY AAT3221IJS-2.4-T1 2.5V Active high SC70JW-8 AKXYY AAT3221IJS-2.5-T1 2.6V Active high SC70JW-8 GPXYY AAT3221IJS-2.6-T1 2.7V Active high SC70JW-8 GDXYY AAT3221IJS-2.7-T1 2.8V Active high SC70JW-8 AQXYY AAT3221IJS-2.8-T1 2.85V Active high SC70JW-8 BYXYY AAT3221IJS-2.85-T1 2.9V Active high SC70JW-8 JCXYY AAT3221IJS-2.9-T1 3.0V Active high SC70JW-8 ALXYY AAT3221IJS-3.0-T1 3.1V Active high SC70JW-8 GVXYY AAT3221IJS-3.1-T1 3.2V Active high SC70JW-8 LEXYY AAT3221IJS-3.2-T1 3.3V Active high SC70JW-8 AMXYY AAT3221IJS-3.3-T1 3.5V Active high SC70JW-8 BMXYY AAT3221IJS-3.5-T1 1.8V Active high SOT23-5 BCXYY AAT3222IGV-1.8-T1 2.0V Active high SOT23-5 AAT3222IGV-2.0-T1 2.3V Active high SOT23-5 AAT3222IGV-2.3-T1 2.4V Active high SOT23-5 AAT3222IGV-2.4-T1 2.5V Active high SOT23-5 ANXYY AAT3222IGV-2.5-T1 2.7V Active high SOT23-5 AOXYY AAT3222IGV-2.7-T1 2.8V Active high SOT23-5 BIXYY AAT3222IGV-2.8-T1 2.85V Active high SOT23-5 FYXYY AAT3222IGV-2.85-T1 2.9V Active high SOT23-5 AAT3222IGV-2.9-T1 3.0V Active high SOT23-5 BHXYY AAT3222IGV-3.0-T1 3.3V Active high SOT23-5 APXYY AAT3222IGV-3.3-T1 3.5V Active high SOT23-5 FTXYY AAT3222IGV-3.5-T1 2.8V Active low SOT23-5 CXXYY AAT3221IGV-2.8-2 T1 3.3V Active low SOT23-5 AAT3221IGV-3.3-2-T1 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET AAT3221/2 150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET 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/pbfree.

Package Information

SOT23-54° ± 4° 0.15 ± 0.07 0.45 ± 0.15 0.10 BSC 1.20 ± 0.25 1.575 ± 0.125 2.80 ± 0.20 0.40 ± 0.10 0.60 REF 2.85 ± 0.15

1.90 BSC

0.95 BSC 1.10 ± 0.20 10° ± 5° GAUGE PLANE 0.075 ± 0.075

0.60 REF

All measurements in millimeters.

150mA NanoPower™ LDO Linear RegulatorPowerLinear TM PRODUCT DATASHEET AAT3221/2 150mA NanoPower™ LDO Linear RegulatorPowerLinear 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. SC70JW-8 0.225 ± 0.075 0.45 ± 0.10 0.05 ± 0.05 2.10 ± 0.30 2.00 ± 0.20 7° ± 3° 4° ± 4° 0.15 ± 0.05

1.10 MAX

0.100 2.20 ± 0.20 0.048REF 0.50 BSC 0.50 BSC 0.50 BSC All measurements in millimeters.