AT5221/AT5221A High PSRR with Low Supply Current LDO Voltage Regulator
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- Reynard Dickerson
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1 FEATURES DESCRIPTION V IN Range:1.6V to 6.0V Low Dropout Voltage:80mV (Typ) (V OUT =3.0V, I OUT =100mA) Output Current:200mA High Ripple Rejection:70dB (Typ)(f=1kHz) Excellent Line Regulation:0.02% / V (Typ) Output Voltage Accuracy:2.0% Standby Mode:0.01µA (Typ) Over Current and Short Circuit Protection Low Supply Current:25µA (Typ) Fixed Output Voltage:1.0V~4.8V (100mV step) Enable High Active Ceramic capacitors are recommend to be used with this IC:C IN =C OUT =1µF Output Capacitor High-Speed Auto-Discharge (AT5221A) The AT5221 Series are CMOS-based voltage regulator ICs with high output voltage accuracy, low supply current, low ON-resistance, and high ripple rejection. Each of these ICs consists of a voltage reference unit, an error amplifier resistor- net for voltage setting, a current limit a nd s h or t c irc uited pr ot ec t io n circuits, and a chip enable circuit. These ICs perform with low dropout voltage and chip enable function. The line transient response and load transient response of the AT5221 Series are excellent, thus these ICs are very suitable for the power supply for hand-held communication equipment. AT5221 are available in the SOT-25 and SOT-343 packages. APPLICATION Power Source for Portable Communication Equipment Power Source for Battery-Powered Equipment ORDER INFORMATION PIN CONFIGURATIONS (TOP VIEW) AT X.X KE R IAT Circuit Type Output Voltage: X.X= 1.0V to 4.8V Shipping: R: Tape & Reel T: Tube KE: SOT-25 KM4: SOT-343 AT 5221 A- X.X KE R IAT Circuit Type A: Auto-Discharge Output Voltage: X.X= 1.0V to 4.8V Shipping: R: Tape & Reel T: Tube KE: SOT-25 KM4: SOT-343 1
2 PIN DESCRIPTIONS Pin Symbol V IN GND EN V OUT Pin Description Input Pin Ground Pin Chip enable Pin, Active High Output Pin, stepwise setting with a step of 0.1V in the range of 1.0V to 4.8V is possible. TYPICAL APPLICATION CIRCUITS BLOCK DIAGRAM AT5221 AT5221A 2
3 ABSOLUTE MAXIMUM RATINGS (Note 1) Parameter Symbol Max Value Unit Supply Voltage, V IN V IN -0.3 to 6.5 V Control Voltage, EN V EN -0.3 to V IN V Output Voltage, V OUT V OUT -0.3 to V IN V Output Current I OUT 300 ma Junction Temperature T J 125 C Storage Temperature Range T STG -65 to +150 C Lead Temperature(Soldering) 5 Sec. T LEAD 260 C Power Dissipation, SOT-25(Note 2) 300 P D mw P T A =25 C SOT SOT-25(Note 2) 333 Thermal Resistance Θ JA C/W SOT Thermal Resistance SOT-25 Θ JC C/W ESD Rating (Human Body Model) (Note 3) V ESD 2 kv RECOMMENDED OPERATING CONDITIONS (Note 4) Parameter Symbol Operation Conditions Unit Supply Voltage, V IN V IN 1.6 to 6 V Control Voltage, V EN V EN -0.3 to V IN V Operating Junction Temperature Range T J -40 to +125 C Operating Ambient Temperature Range T A -40 to +85 C Note 1: Stresses listed as the above Absolute Maximum Ratings may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2: Thermal Resistance is specified with the component mounted on a low effective thermal conductivity test board in free air at T A =25 C. Note 3: Devices are ESD sensitive. Handling precaution recommended. Note 4: The device is not guaranteed to function outside its operating conditions. 3
4 ELECTRICAL CHARACTERISTICS T a =25 C, V IN =V EN =V OUT +1V, I OUT =1mA, unless otherwise noted Function Parameter Symbol Test Conditions Min Typ Max Unit Output Voltage (Note 5) V OUT V IN = V OUT +1V V OUT x V OUT x I OUT = 10mA V V IN =V OUT +1V Load Regulation (Note 5) V OUT 1mA I OUT 100mA mv Line Regulation (Note 5) V OUT V OUT + 0.5V V IN 6V, V IN V OUT I OUT =10mA %/V Supply Current I SS V IN = V OUT +1V, I OUT = 0mA µa Supply Current (standby) Istandby V IN = V OUT +1V, V EN = GND µa I OUT = 100mA 1.0V VOUT <1.2V V V OUT <1.5V Dropout Voltage V DROP 1.5V V OUT <2.0V (Note 5, 6) 2.0V V OUT <2.5V mv 2.5V V OUT <3.0V V V OUT f =1kHz Ripple Rejection RR V IN = V OUT +1V I OUT = 10mA 70 db Input Voltage V IN V Output Voltage I OUT = 30mA V OUT / T Temperature Coefficient -40 C T J 85 C ±100 ppm/ C Current Limit I LIM V IN = V OUT +1V 400 ma Short Current I SC V IN = V OUT +1V V OUT is shorted to GND 70 ma EN Input Voltage H V IH V EN Input Voltage "L" V IL 0.4 V Auto-discharge resistance R LOW (Note 7) 60 ohm Note 5: Low duty cycle pulse testing with Kelvin connections repaired. Note 6: Defined as the input to output differential at which the output voltage drops to 2% below the value measured at a differential of 1V. Note 7: For AT5221A. 4
5 TYPICAL OPERATING CHARACTERISTICS (1)Output Current Vs. Output Voltage: AT5221/AT5221A-2.2V, V IN = V EN =3.2V 4 (2)Input Voltag Vs. Output Voltage: AT5221/AT5221A-2.2V, V IN = V EN =3.2V 2.3 Output Voltage(V) Output Voltage(V) Vout(V)_Io=1mA Vout(V)_Io=30mA Vout(V)_Io=100mA Vout(V)_Io=150mA Vout(V)_Io=200mA Output Current(mA) Input Voltage(V) (3)I OUT Vs. V DROP : AT5221/AT5221A-2.2V, V IN = V EN =3.2V C IN =C OUT =1uF(ceramic) (4)Input Voltage Vs. Supply Current: AT5221/AT5221A-2.2V, V IN = V EN =3.2V C IN =C OUT =1uF(ceramic) Vdrop (mv) Vdrop_Tc=-40 C Vdrop_Tc=25 C Vdrop_Tc=85 C Supply Current(uA) Tc=-20 C Tc=25 C Tc=80 C Iout(mA) Input Voltage(V) 5
6 TYPICAL OPERATING CHARACTERISTICS (CONTINUED) (5)Load Transient: AT5221/AT5221A-2.9V V IN = V EN =3.9V, I OUT =10~100mA, *CH1: V OUT (offset) ; CH4:I OUT (6-1) Line Transient: AT5221/AT5221A-2.9V Line Transient= V OUT =28.8mV V IN =3.9~4.9V, C OUT =1uF(ceramic), Ta=25 C *CH1: V IN ; CH2: V OUT *I OUT =1mA (6-2) Line Transient: AT5221/AT5221A-2.9V Line Transient= V OUT =28.8mV V IN =3.9~4.9V, C OUT =1uF(ceramic), Ta=25 C *CH1: V IN ; CH2: V OUT *I OUT =30mA (6-3) Line Transient: AT5221/AT5221A-2.9V Line Transient= V OUT =28.8mV V IN =3.9~4.9V, C OUT =1uF(ceramic), Ta=25 C *CH1: V IN ; CH2: V OUT *I OUT =100mA 6
7 TYPICAL OPERATING CHARACTERISTICS (CONTINUED) (7-1) Start up Characteristics(include overshoot): AT5221/AT5221A-2.2V *Light-load: I OUT =1mA CH1: V EN =0~2V ; CH2: V OUT (7-2) Start up Characteristics(include overshoot): AT5221/AT5221A-2.2V *Mid-load: I OUT =30mA CH1: V EN =0~2V ; CH2: V OUT (7-3) Start up Characteristics(include overshoot): AT5221/AT5221A-2.2V *Heavy-load: I OUT =100mA CH1: V EN =0~2V ; CH2: V OUT 7
8 TYPICAL OPERATING CHARACTERISTICS (CONTINUED) (8) Repple Rejection: A5221/AT5221A-2.2V C OUT =1uF(ceramic), V RIPPLE =250mV-peak,I OUT =10mA, PSRR=66.663dB@1KHz (9) Temperature vs. Output Voltage: AT5221/AT5221A-2.2V C IN =C OUT =1uF(ceramic), V IN =V EN =3.2V, I OUT =10mA 2.4 Output Voltage(V) Temperature( ) 8
9 PACKAGE OUTLINE DIMENSIONS 9
10 PACKAGE OUTLINE DIMENSIONS Note : Information provided by IAT is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an IAT product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: IAT does not authorize any IAT product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (II) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. Typical numbers are at 25 C and represent the most likely norm. 10
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