ST2123 CMOS Positive Voltage Regulator Elektronische Bauelemente RoHS Compliant Product Description The ST2123 series of positive,linear regulators feature low quiescent current (35µA typ.) with low dropout voltage, making them ideal for battery applications. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. The SOT-26 version also features a "Power Good" detector, which pulls low when the output is out of regulation. The ST2123 is stable with an output capacitance of 2.2µF or greater. Features * High Accurate ± 1.5% * Over-Temperature Shutdown * Adjustable Output Voltage REF. * Very Low Dropout Voltage A B C D E F * Low Temperature Coefficient * Short Circuit Current Fold-back * Guaranteed 300mA output * Current Limiting Millimeter Min. Max. 2.70 3.10 2.60 3.00 1.40 1.80 0.30 0.55 0 0.10 0° 10° REF. G H I J K L Dimensions Millimeter 1.90 REF. 1.20 REF. 0.12 REF. 0.37 REF. 0.60 REF. 0.95 REF. * Power Good Detector * Power-Saving Shutdown Mode Applications * PC Peripherals * Wireless Devices * Portable Electronics * Battery Powered Widgets * Electronic Scales Functional Block Diagram * Instrumentation * Cordless Phones Typical Application Circuit ST2123 http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 1 of 8 ST2123 CMOS Positive Elektronische Bauelemente Voltage Regulator Absolute Maximum Ratings Parameter Ratings Symbol Input Voltage VIN Output Current IOUT Input, Output Voltage V PD/(VIN-VO) mA V GND-0.3 to VIN+0.3 Topr Operating Ambient Temperature o T=100 C) C o C -40~+125 150 Tj Max. Max. Junction Temperature Thermal Resistance o -40~+85 Tj Junction Temperature Power Dissipation ( EDS Classification Unit 8 θja 260 PD 380 B o C o C /W mW o Electrical Characteristics Ta=25 C unless otherwise noted Parameter Symbol Min. -1.5% Output Voltage VO Ground Pin Current Output Current IGND _ Io Current Limit ILIM Load Regulation Dropout Voltage REGLOAD VDROPOUT Input Voltage REGLINE VIN Over Temperature Shutdown OTS Over Temperature Hystersis Output Voltage Temperature Coefficient Short Circuit Current 2 OTH Power Supply Rejection Output Voltage Noise EN Input Threshold EN Input Bias Current TC ISC PSRR eN VEH VEL IEH IEL _ Max. _ 300 _ _ 300 450 _ 0.2 _ _ _ _ _ _ _ _ _ 1 Note Unit 1.5% 35 _ Line Regulation Typ. V uA mA V IN=5V,Io>1.2 % 1300 400 300 mV VIN=5V,Io=1mA~300mA 1.5V< VON(NOM) ≤ 2.0V Io=300mA 2.0V <VON(NOM) ≤ 2.8V Vo=VON(NOM)-2% 2.8V<VON(NOM)<3.8V 0.15 0.02 0.1 _ 7 % _ o _ 30 _ ppm/ oC _ 150 300 mA _ 60 _ _ _ 50 _ 20 _ _ 30 _ 2 0 _ _ _ _ _ _ 0.5 VIN Io=5mA VIN=VOUT(T)+1 to VOUT(T)+2 Vo<2.0V Vo≥ 2.0V V 30 150 V IN=5V,Io>1.2 1 o _ VIN=5V,Io=1mA VIN=5V,Io=1mA~300mA mA _ _ Condition C C VIN=5V,VOUT<0.8V VIN=5V Io=100mA Co=2.2Mf f=100Hz dB f=1kHz f=10kHz uVrms Co=2.2uF f=10Hz~100kHz Io=10mA CBYP=0uF V VIN=2.7V to 7V uA VEN=VIN,VIN=2.7V to 7V VEN=0V,VIN=2.7V to 7V 1 uA VIN=5V,Vo=0V,VEN<VEL 0.1 V V % ON(NOM) % VON(NOM) Io=35uA ,VEN<VEL 0.4 0.1 0.5 Shutdown Supply Current ISD _ Shutdown Output Voltage Output Under Voltage Vo,SD VUV 0 _ _ Output Over Voltage VOV 115 _ ADJ Input Bias Current IADJ _ 1.0 _ 1.215 1.23 V PG Leakage Current VREF ILC 1.2 VPG _ uA PG Voltage Rating _ 1 _ V Vo in regulation VOL _ 7 PG Voltage Low 0.4 V ISINK=0.4mA ADJ Reference Voltage http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A _ _ _ 85 _ uA VPG=7V Any changing of specification will not be informed individual Page 2 of 8 ST2123 CMOS Positive Elektronische Bauelemente Note: Voltage Regulator 1.VIN(MON)=VOUT+VDROPOUT 2.To prevent the Short Current protection feature from being prematurely activated, the input voltage must be applied before a current source loas is applied. Ordering Information(contd.) Part Number Marking ST 2123-AD 3BAD2 XXXX Output Voltage Part Number Marking Output Voltage Adjustable Detailed Description The ST2123 of COMS regulators contain a PMOS pass transistor,voltage reference, error amplifier,over-current protection and thermal shutdown and Power Good detection circuitry. The P-channel pass transistor receives data from the error amplifier, over-current shutdown,and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to o a precision reference.Over-current and Thermal shutdown circuits become active when the junction temperature exceeds150 C, or the current exceeds 300mA.During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC. The ST2123 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The ST2123 also incorporates current fold-back to reduce power dissipation when the output is short circuited.This feature becomes active when the output drops below 0.8 volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts. External Capacitors The ST212 3 is stable with an output capacitance to ground of 2.2uF or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Elertrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1 uF ceramic capacitor with a 10 uF Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 0.1uF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable . The can be achieved with a "Star" connection. Enable The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1uA. This pin behaves much like an electronic switch. Power Good The ST2123 includes the Power Good feature. When the output is not within ± 10% of the specified voltage, it pulls low. This can occur under the following confitions: 1. Input voltage too low 2. During over-temperature 3. During over-current 4. If output is pulled up (note: PG pin is an open-drain output) ht tp://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 3 of 8 ST2123 Elektronische Bauelemente CMOS Positive Voltage Regulator Characteristics Curve http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 4 of 8 ST2123 Elektronische Bauelemente http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A CMOS Positive Voltage Regulator Any changing of specification will not be informed individual Page 5 of 8 ST2123 Elektronische Bauelemente ht tp://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A CMOS Positive Voltage Regulator Any changing of specification will not be informed individual Page 6 of 8 ST2123 CMOS Positive Elektronische Bauelemente Voltage Regulator External Resistor Divider Table R1(K Ohm) 1 2 Vout 5 10 20 50 100 200 500 1000 R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215) 1.30 14.29 28.59 71.47 142.94 285.88 714.71 1.35 9.00 18.00 45.00 90.00 180.00 450.00 1.40 6.57 13.14 32.84 65.68 131.35 328.38 1.45 5.17 10.34 25.85 51.70 103.40 258.51 517.02 1.50 4.26 8.53 21.32 42.63 85.26 213.16 426.32 852.63 1.55 3.63 7.25 18.13 36.27 72.54 181.34 362.69 725.37 1.60 3.16 6.31 15.78 31.56 63.12 157.79 315.58 631.17 1.65 2.79 5.59 13.97 27.93 55.86 139.66 279.31 558.62 1.70 2.51 5.01 12.53 25.05 50.10 125.26 250.52 501.03 1.75 2.27 4.54 11.36 22.71 45.42 113.55 227.10 454.21 1.80 2.08 4.15 10.38 20.77 41.54 103.85 207.69 415.38 1.85 1.91 3.83 9.57 19.13 38.27 95.67 191.34 382.68 1.90 1.77 3.55 8.87 17.74 35.47 88.69 177.37 354.74 1.95 1.65 3.31 8.27 16.53 33.06 82.65 165.33 330.61 826.53 2.00 1.55 3.10 7.74 15.48 30.96 77.39 154.78 309.55 773.89 2.05 1.46 2.91 7.28 14.55 29.10 72.75 145.51 291.02 727.54 2.10 1.37 2.75 6.86 13.73 27.46 68.64 137.29 274.58 686.44 2.15 1.30 2.60 6.50 12.99 25.99 64.97 129.95 259.89 649.73 2.20 1.23 2.47 6.17 12.34 24.67 61.68 123.35 246.70 616.75 2.25 1.71 2.35 5.87 11.74 23.48 58.70 117.39 234.78 586.96 2.30 1.12 2.24 5.60 11.20 22.40 55.99 111.98 223.96 559.91 2.35 1.07 2.14 5.35 10.70 21.41 53.52 107.05 214.10 535.24 2.40 1.03 2.05 5.13 10.25 20.51 51.27 102.53 205.06 512.66 2.45 0.98 1.97 4.92 9.84 19.68 49.19 98.38 196.76 491.90 2.50 0.95 1.89 4.73 9.46 18.91 47.28 94.55 189.11 472.76 2.55 0.91 1.82 4.55 9.10 18.20 45.51 91.01 182.02 455.06 2.60 0.88 1.75 4.39 8.77 17.55 43.86 87.73 175.45 438.63 877.26 2.65 0.85 1.69 4.23 8.47 16.93 42.33 84.67 169.34 423.34 846.69 2.70 0.82 1.64 4.09 8.18 16.36 40.91 81.82 163.64 409.09 818.18 2.75 0.79 1.58 3.96 7.92 15.83 39.58 79.15 158.31 395.77 791.53 2.80 0.77 1.53 3.83 7.67 15.33 38.33 76.66 153.31 383.28 766.56 2.85 0.74 1.49 3.72 7.43 14.86 37.16 74.13 148.62 371.56 743.12 2.90 0.72 1.44 3.61 7.21 14.42 36.05 72.11 144.21 360.53 721.07 2.95 0.70 1.40 3.50 7.00 14.01 35.01 70.03 140.06 350.14 700.29 3.00 0.68 1.36 3.40 6.81 13.61 34.03 68.07 136.13 340.34 680.67 3.05 0.66 1.32 3.31 6.62 13.24 33.11 66.21 132.43 331.06 662.13 3.10 0.64 1.29 3.22 6.45 12.89 32.23 64.46 128.91 322.28 644.56 3.15 0.63 1.26 3.14 6.28 12.56 31.40 62.79 125.58 313.95 627.91 3.20 0.61 1.22 3.06 6.12 12.24 30.60 61.21 122.42 306.05 612.09 3.25 0.60 1.19 2.99 5.97 11.94 29.85 59.71 119.41 298.53 597.05 3.30 0.58 1.17 2.91 5.83 11.65 11.65 58.27 116.55 291.37 582.73 ht tp://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 7of 8 ST2123 CMOS Positive Elektronische Bauelemente Voltage Regulator External Resistor Divider Table R1(K Ohm) 1 2 Vout 5 10 20 50 100 200 500 1000 R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215) 3.35 0.57 1.14 2.85 5.69 11.38 28.45 56.91 113.82 284.54 569.09 3.40 0.56 1.11 2.78 5.56 11.12 27.80 55.61 111.21 278.03 556.06 3.45 0.54 1.09 2.72 5.44 10.87 27.18 54.36 108.72 271.81 543.62 3.50 0.53 1.06 2.66 5.32 10.63 26.59 53.17 106.35 265.86 531.73 3.55 0.52 1.04 2.60 5.20 10.41 26.02 52.03 104.07 260.17 520.34 3.60 0.51 1.02 2.55 5.09 10.19 25.47 50.94 101.89 254.72 509.43 3.65 0.50 1.00 2.49 4.99 9.98 24.95 49.90 99.79 249.49 498.97 3.70 0.49 0.98 2.44 4.89 9.78 24.45 48.89 97.79 244.47 488.93 3.75 0.48 0.96 2.40 4.79 9.59 23.96 47.93 95.86 239.64 479.29 3.80 0.47 0.94 2.35 4.70 9.40 23.50 47.00 94.00 235.01 470.02 3.85 0.46 0.92 2.31 4.61 9.22 23.06 46.11 92.22 230.55 461.10 3.90 0.45 0.91 2.26 4.53 90.5 22.63 45.25 90.50 226.26 452.51 3.95 0.44 0.89 2.22 4.44 8.88 22.21 44.42 88.85 222.12 444.24 4.00 0.44 0.87 2.18 4.36 8.73 21.81 43.63 87.25 218.13 436.27 4.05 0.43 0.86 2.14 4.29 8.57 21.43 42.86 85.71 214.29 428.57 4.10 0.42 0.84 2.11 4.21 8.42 21.06 42.11 84.23 210.57 421.14 4.15 0.41 0.83 2.07 4.14 8.28 20.70 41.40 82.79 206.98 413.97 4.20 0.41 0.81 2.04 4.07 8.14 20.35 40.70 81.41 203.52 407.04 4.25 0.40 0.80 2.00 4.00 8.01 20.02 40.03 80.07 200.16 400.33 4.30 0.39 0.79 1.97 3.94 7.88 19.69 39.38 78.77 196.92 393.84 4.35 0.39 0.78 1.97 3.88 7.75 19.38 38.76 77.51 193.78 387.56 4.40 0.38 0.76 1.91 3.81 7.63 19.07 38.15 76.30 190.74 381.48 4.45 0.38 0.75 1.88 3.76 7.51 18.78 37.56 75.12 187.79 375.58 4.50 0.37 0.74 1.85 3.70 7.40 18.49 36.99 73.97 184.93 369.86 4.55 0.36 0.73 1.82 3.64 7.29 18.22 36.43 72.86 182.16 364.32 4.60 0.36 0.72 1.79 3.59 7.18 17.95 35.89 71.79 179.47 358.94 4.65 0.35 0.71 1.77 3.54 7.07 17.69 35.37 70.74 176.86 353.71 4.70 0.35 0.70 1.74 3.49 6.97 17.43 34.86 69.73 174.32 348.64 4.75 0.34 0.69 1.72 3.44 6.87 17.19 34.37 68.74 171.85 343.71 4.80 0.34 0.68 1.69 3.39 6.78 16.95 33.89 67.78 169.46 338.91 4.85 0.33 0.67 1.67 3.34 6.69 16.71 33.43 66.85 167.13 334.25 4.90 0.33 0.66 1.65 3.30 6.59 16.49 32.97 65.94 164.86 329.72 4.95 0.33 0.65 1.63 3.25 6.51 16.27 32.53 65.06 162.65 325.30 5.00 0.32 0.64 1.61 3.21 6.42 16.05 32.10 64.02 160.50 321.00 Note: Small load (greater than 2mA) is necessary as R1 or R2 is large than 50Kohm. Otherwise, output voltage probably cannot be pulled down to 0V on disable mode http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 8 of 8