芯美电子 AAP2917 300mA, High PSRR Low-Noise LDO DESCRIPTION FEATURES The AAP2917 is an efficient, CMOS voltage regulator optimized for ultra-low-noise applications. It offers high output accuracy, extremely low dropout voltage low ground current and fast start-up time. The AAP2917 provides a very low noise output, ideal for RF applications where a clean voltage source is required. A noise bypass pin is also available for further reduction of output noise. Designed specifically for handheld and batterypowered devices, the AAP2917 provides a TTL-logic-compatible enable pin. When disabled, power consumption drops nearly to zero. The AAP2917 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices. Available in the SC-70 and SOT23-5 package, the AAP2917 offers a wide range of output voltages. Key features include current limit, thermal shutdown and faster transient response. z z z z z z z z z z z z Space-Saving 5-pin SC-70 Package 2.5V to 6V Input Voltage Range 50µV(rms) Output Noise 250mV Dropout @ 300mA 75dB PSRR at 1kHz Low 70µA Ground Current Up to 300mA Output Current Stability with 1µF Ceramic Output Capacitors Excellent Load/Line Transient Thermal Shutdown and Current Limit Protection Available in 1.2V,1.3V,1.5V,1.8V,1.85V, 2.5V,2.8V,2.85V, 2.9V,3.0V,3.3V,3.5V,4.8V and Adjustable Voltages RoHS Compliant and 100% Lead (Pb)-Free APPLICATIONS z z z z Cellular Phones Bluetooth Portable Radios and Accessories PDA and Palmtop Computers Consumer/Personal Electronics Block Diagram Figure 1. DS2917 Ver1.0 July 2008 1 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 AAP2917 Typical Application Circuit Figure 2. Fixed-Voltage LDO Regulator Pin Configurations Package Type Pin Configurations SC-70 SOT23-5 Fixed-Voltage Adjustable Voltage Pin Description PIN PIN VIN 1 Input voltage of the LDO GND 2 Common ground VEN 3 Enable input logic, enable high BYPASS ADJ VOUT DS2917 Ver1.0 4 DESCRIPTION Optional bypass capacitor for noise reduction Adjustable regulator feedback input. Connect to resistor divider. 5 Output voltage of the LDO July 2008 2 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 AAP2917 Ordering Information Order Number Package Type Marking Operating Temperature Range AAP2917-12NIR1 AAP2917-13NIR1 AAP2917-15NIR1 AAP2917-18NIR1 AAP2917-185NIR1 AAP2917-25NIR1 AAP2917-28NIR1 AAP2917-285NIR1 AAP2917-29NIR1 AAP2917-30NIR1 AAP2917-33NIR1 AAP2917-35NIR1 AAP2917-48NIR1 AAP2917NIR1 AAP2917-12VIR1 AAP2917-13VIR1 AAP2917-15VIR1 AAP2917-18VIR1 AAP2917-185VIR1 AAP2917-25VIR1 AAP2917-28VIR1 AAP2917-285VIR1 AAP2917-29VIR1 AAP2917-30VIR1 AAP2917-33VIR1 AAP2917-35VIR1 AAP2917-48VIR1 AAP2917VIR1 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SC-70 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 pT xx pX xx pC xx pD xx pU xx pB xx pE xx pF xx pW xx pG xx pH xx pR xx pK xx pA xx pT xxxx pX xxxx pC xxxx pD xxxx pU xxxx pB xxxx pE xxxx pF xxxx pW xxxx pG xxxx pH xxxx pR xxxx pK xxxx pA xxxx -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C -40 °C to 125°C AAP2917- □□□ □ □ □ □ Lead Free Code 1: Lead Free 0: Lead Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type N: SC-70 V: SOT-23 Output Voltage 12:1.2V 13:1.3V 185:1.85V 25:2.5V 285:2.85V 29:2.9V 33:3.3V 35:3.5V DS2917 Ver1.0 July 2008 15:1.5V 18:1.8V 28:2.8V 30:3.0V 48:4.8V Blank: Adjustable 3 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 AAP2917 Absolute Maximum Ratings VIN,VEN ------------------------------------------------------------------------------- -0.3 to 6.5V VOUT ----------------------------------------------------------------------------- -0.3 to (VIN+0.3) Junction Temperature --------------------------------------------------------------------- 150°C Storage Temperature Range ---------------------------------------------------- -65°C to +150°C Lead Temperature -------------------------------------------------------------------------- 260°C Thermal Resistance θJA(SC-70) --------------------------------------------------------- 330°C/W Thermal Resistance θJA(SOT23-5) ------------------------------------------------------ 220°C/W ESD Rating Human Body Model ---------------------------------------------------------------------- 2kV Operating Ratings VIN --------------------------------------------------------------------------------------- 2.5 to 6V VEN ----------------------------------------------------------------------------------- 0 to (VIN+0.3) Operating Temperature Range ------------------------------------------------- -40°C to +125°C Electrical Characteristics Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85℃ ,Unless otherwise specified. Symbol Parameter Conditions Input Voltage ∆VOUT Output Voltage Accuracy IOUTMAX Maximum Output Current ILIMIT VDROP IQ Current Limit Dropout Voltage (Note1) Quiescent Current Min AAP2917 Typ Max. IOUT=1mA,TA=25℃ 2.5 -2 6 2 IOUT=1mA,TA=-40℃ to 85℃ -3.0 3.0 TA>0℃ 300 VOUT=VOUT(nom) × 90%, TA>0℃ 300 Unit V % mA 440 800 VOUT≧3V, IOUT=80mA 72 125 VOUT≧3V ,IOUT=300mA 250 350 2.4≦VOUT≦3V,IOUT=80mA 80 135 2.4≦VOUT≦3V,IOUT=300mA 300 400 IOUT=0.05mA 70 160 VIN=VOUT (nom)-0.1V,IOUT=0mA 110 250 mA mV µA VLNR Line Regulation VIN=(VOUT+0.5V) to 6V, IOUT=0.1mA 0.02 0.25 %/V VLDR Load Regulation 1mA ≤ IOUT ≤ 300mA 0.002 0.013 %/mA ISHDN Shutdown Supply Current VEN=0,TA=25℃ 0.01 1 PSRR VEN=0,TA=85℃ VIN=(VOUT+1V)DC+0.5VP-P f=1kHz, ILOAD=10mA Power Supply Ripple VIN=(VOUT+1V)DC+0.5VP-P f=10kHz, Rejection ILOAD=10mA VIN=(VOUT+1V)DC+0.5VP-P f=100kHz, ILOAD=10mA f=10Hz~100kHz, Fixed-Voltage Output Noise Voltage (RMS) ILOAD=10mA Adjustable Voltage Turn-on Time (Note2) DS2917 Ver1.0 July 2008 RLOAD=50Ω,TA=25℃ 0.05 µA 75 dB 60 45 50 µV 239 200 4 联系电话：１５９９９６４４５７９ ８３１５１７１５ µs 芯美电子 AAP2917 Electrical Characteristics (continued) Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85℃ ,Unless otherwise specified. VENL (Maximum Low Level VENL 0.4 VIN=2.5V to 5.5V Input Voltage at EN) VENH (Minimum high Level VENH 1.5 VIN=2.5V to 5.5V Input Voltage at EN) VEN Input Bias Current VIN=5.5V, VEN=0 or 5.5V 1 FB Input Bias Current (ADJ 1 VIN=5.5V, VFB=1.3V Version) FB Pin Voltage (ADJ VFB 1.176 1.2 1.224 TA=25℃ Version) Thermal Shutdown TSD 155 Temperature Thermal Shutdown ∆TSD 15 Hysteresis Note 1: Dropout is defined as VIN-VOUT when VOUT is 100mV below the value of VOUT for VIN=VOUT+0.5V Note 2: Test time needed for VOUT to reach 90% of final value. DS2917 Ver1.0 July 2008 5 联系电话：１５９９９６４４５７９ ８３１５１７１５ V V nA nA V ℃ ℃ 芯美电子 AAP2917 Typical Operating Characteristics OUTPUT VOLTAGE ACCURACY vs. lOAD CURRENT OUTPUT VOLTAGE vs. INPUT VOLTAGE 3.0 0.6 0.4 IOUT=0mA DEVIATION (%) OUTVOLTAGE (V) 2.5 2.0 IOUT=300mA 1.5 1.0 0.5 0.2 0.0 -0.2 -0.4 0.0 -0.6 0 1 2 3 4 5 6 0 50 INPUTVOLTAGE (V) 250 300 DROPOUT VOLTAGE vs. LOAD CURRENT OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE 350 DROPOUT VOLTAGE (mV) 0.8 IOUT=1mA 0.4 DEVIATION (%) 100 150 200 LOAD CURRENT (mA) 0.0 -0.4 300 TEMP=85 250 TEMP=25 200 150 100 TEMP=-40 50 0 -0.8 -40 0 -15 10 35 60 50 85 100 150 200 250 300 LOAD CURRENT (mA) o Temperature ( C) GROUND CURRENT vs. INPUT VOLTAGE GROUND CURRENT vs. LOAD CURRENT 240 200 IOUT=300mA GROUND CURRENT (uA) GROUND CURRENT (uA) 240 160 IOUT=0mA 120 80 40 0 200 VIN=5.5V 160 120 VIN=3.3V 80 40 0 0 1 2 3 4 5 6 0 Ver1.0 July 2008 100 150 200 LOAD CURRENT (mA) INPUT VOLTAGE (V) DS2917 50 6 联系电话：１５９９９６４４５７９ ８３１５１７１５ 250 300 芯美电子 AAP2917 GROUND CURRENT vs. TEMPERATURE GROUND CURRENT (uA) 120 100 80 60 40 20 0 -40 DS2917 -20 Ver1.0 0 20 40 60 80 o TEMPERATURE ( C) July 2008 100 120 140 7 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 DS2917 Ver1.0 July 2008 AAP2917 8 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 AAP2917 Application Note capacitance can drop by more than 50% as the temperature goes from 25°C to 85°C. Therefore, X7R is recommended over Z5U and Y5V in applications where the ambient temperature will change significantly above or below 25°C. External Capacitors Like any low-dropout regulator, the AAP2917 requires external capacitors for regulator stability. The AAP2917 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. Noise Bypass Capacitor Connecting a 0.01µF capacitor between the CBYPASS pin and ground significantly reduces noise on the regulator output. This cap is connected directly to a high impedance node in the bandgap reference circuit. Any significant loading on this node will cause a change on the regulated output voltage. For this reason, DC leakage current through this pin must be kept as low as possible for best output voltage accuracy. The types of capacitors best suited for the noise bypass capacitor are ceramic and film. Unlike many other LDO’s, addition of a noise reduction capacitor does not effect the load transient response of the device. Input Capacitor An input capacitance of 1µF is required between the AAP2917 input pin and ground (the amount of the capacitance may be increased without limit). This capacitor must be located a distance of not more than 1cm from the input pin and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input. If a tantalum capacitor is used at the input, it must be guaranteed by the manufacturer to have a surge current rating sufficient for the application. There are no requirements for the ESR on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 1µF over the entire operating temperature range. Adjustable Operation The adjustable version of the AAP2917 has an output voltage range of 1.2V to 4.5V. The output voltage of the AAP2917 adjustable regulator is programmed using an external resistor divider as shown in Figure3. The output voltage is calculated using: Output Capacitor The AAP2917 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor (temperature characteristics X7R, X5R, Z5U, or Y5V) in 1 to 22µF range with 5mΩ to 500mΩ ESR range is suitable in the AAP2917 application circuit. The output capacitor must meet the requirement for minimum amount of capacitance and also have an ESR (Equivalent Series Resistance) value which is within a stable range (5mΩ to 500mΩ) V =V O July 2008 R R 1) 2 Utilize the following equation for adjusting the output to a particular voltage: V R 1 = R 2 O − 1 1.2V Choose R2=50k to optimize accuracy, power supply rejection, noise and power consumption. Capacitor Characteristics The AAP2917 is designed to work with ceramic capacitors on the output to take advantage of the benefits they offer: for capacitance values in the range of 1µF to 4.7µF range, ceramic capacitors are the smallest, least expensive and have the lowest ESR values (which makes them best for eliminating high frequency noise). The ESR of a typical 1µF ceramic capacitor is in the range of 20mΩ to 40mΩ, which easily meets the ESR requirement for stability by the AAP2917. The ceramic capacitor’s capacitance can vary with temperature. The capacitor type X7R, which operates over a temperature range of -55°C to +125°C, will only vary the capacitance to within ±15%. Most large value ceramic capacitors ( ≈ 2.2µF) are manufactured with Z5U or Y5V temperature characteristics. Their Ver1.0 × (1 + Where: Vref= 1.2V typ. (the internal reference voltage) No-Load Stability The AAP2917 will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. DS2917 ref Figure3. Adjustable Regulator with Resistors 9 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 AAP2917 On/Off Input Operation The AAP2917 is turned off by pulling the VEN pin low, and turned on by pulling it high. If this feature is not used, the VEN pin should be tied to VIN to keep the regulator output on at all time. To assure proper operation, the signal source used to drive the VEN input must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. Fast Start up The AAP2917 output starts up after Vref voltage reaches its final value (1.2V nomial). The start-up time is determined by the time constant of the bypass capacitor. The smaller the capacitor value, the shorter the start-up time, but less noise gets reduced. As a result, start-up time and noise reduction need to be taken into design consideration when choosing the value of the bypass capacitor. Thermal Considerations Thermal protection limits power dissipation in AAP2917.When the operation junction temperature exceeds 155°C, the OTP circuit starts the thermal shutdown function turn the pass element off. The pass element turn on again after the junction temperature cools by 15°C. For continue operation, do not exceed absolute maximum operation junction temperature 125°C. The power dissipation definition in device is : PD = (VIN - VOUT ) × I OUT + VIN × I Q The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula : PD (MAX) = (TJ(MAX) - TA ) θ JA Where TJ(MAX) is the maximum operation junction temperature 125°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of AAP2917, where TJ(MAX) is the maximum junction temperature of the die (125°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (θJA is layout dependent) only for SC-70 package is 330°C/W on standard thermal test board. The maximum power dissipation at TA = 25°C can be calculated by following formula : PD (MAX) = (125°C − 25°C ) / 330 = 300 mW (SC − 70) The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance θJA. DS2917 Ver1.0 July 2008 10 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 AAP2917 Packaging Information SC-70 SYMBOLS A A1 b D E E1 e L DS2917 Ver1.0 July 2008 MILLIMETERS MIN. MAX. 0.80 1.10 0.025 0.10 0.15 0.40 2.00 1.25 1.90 2.30 0.65 0.21 0.46 INCHES MIN. 0.031 0.001 0.006 MAX. 0.044 0.004 0.016 0.079 0.049 0.075 0.091 0.026 0.008 0.018 11 联系电话：１５９９９６４４５７９ ８３１５１７１５ 芯美电子 AAP2917 SOT23-5 SYMBOL S A A1 D E1 E L b e DS2917 Ver1.0 July 2008 MILLIMETERS MIN. MAX. 1.30 0.00 0.15 2.90 1.60 2.60 3.00 0.30 0.60 0.30 0.50 0.95 INCHES MIN. 0.000 MAX. 0.052 0.006 0.114 0.063 0.102 0.012 0.012 0.118 0.024 0.020 0.037 12 联系电话：１５９９９６４４５７９ ８３１５１７１５