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ST2123
CMOS Positive
Elektronische Bauelemente
RoHS Compliant Product
Voltage Regulator
Description
The ST2123 series of positive,linear regulators feature low quiescent current (35A 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 2.2F or greater.
Features
* High Accurate 1.5% * Over-Temperature Shutdown
* Adjustable Output Voltage * Very Low Dropout Voltage * Low Temperature Coefficient * Short Circuit Current Fold-back * Guaranteed 300mA output * Current Limiting * Power Good Detector * Power-Saving Shutdown Mode
REF. A B C D E F
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.
Applications
* PC Peripherals * Wireless Devices
* Portable Electronics * Battery Powered Widgets * Electronic Scales * Instrumentation * Cordless Phones
Functional Block Diagram
Typical Application Circuit
ST2123
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01-Jun-2002 Rev. A
Page 1 of 8
ST2123
Elektronische Bauelemente
CMOS Positive Voltage Regulator
Absolute Maximum Ratings
Parameter
Input Voltage Output Current Input, Output Voltage Operating Ambient Temperature Junction Temperature Max. Junction Temperature Thermal Resistance Power Dissipation ( EDS Classification Topr Tj Tj Max.
o
Symbol
VIN IOUT
Ratings
8
PD/(VIN-VO) GND-0.3 to VIN+0.3 -40~+85 -40~+125 150 260 380 B
Unit
V mA
o o
V
C C C
o o
T=100 C)
o
ja
PD
C /W
mW
Electrical Characteristics Ta=25 C unless otherwise noted
Parameter
Output Voltage
Symbol
VO IGND Io ILIM
REGLOAD
Min.
-1.5%
_
Typ.
_
Max.
1.5%
_ _ _
Unit
V uA
mA mA
Condition
VIN=5V,Io=1mA
Ground Pin Current Output Current
Current Limit Load Regulation Dropout Voltage
35
_
VIN=5V,Io=1mA~300mA VIN=5V,Io>1.2 VIN=5V,Io>1.2 VIN=5V,Io=1mA~300mA 1.5V< VON(NOM) 2.0V Io=300mA 2.0V 300 300
_ _ _ _ _
450 0.2
_ _ _ _
1 1300 400 300 0.15 0.1 7
_
_ _
%
mV
VDROPOUT
Line Regulation
REGLINE VIN OTS OTH TC ISC PSRR
_
0.02
1
% V
o o
Vo<2.0V
Vo 2.0V
Input Voltage Over Temperature Shutdown Over Temperature Hystersis Output Voltage Temperature Coefficient Short Circuit Current 2 Power Supply Rejection
Note
_ _ _ _ _ _ _
_
Io=5mA VIN=VOUT(T)+1 to VOUT(T)+2
150 30 30 150 60 50 20 30
_ _ _ _
C C VIN=5V,VOUT<0.8V f=100Hz f=1kHz f=10kHz Co=2.2uF VIN=5V Io=100mA Co=2.2Mf f=10Hz~100kHz Io=10mA CBYP=0uF
ppm/ oC mA dB uVrms V uA uA V VON(NOM) % % VON(NOM) uA V uA V V VPG=7V
300
_ _ _ _
Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current Shutdown Output Voltage Output Under Voltage Output Over Voltage ADJ Input Bias Current ADJ Reference Voltage PG Leakage Current PG Voltage Rating PG Voltage Low
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eN VEH VEL IEH IEL ISD Vo,SD VUV VOV IADJ VREF ILC VPG VOL
_
2 0
_ _ _
VIN
0.4 0.1 0.5 1 0.1 85
_ _
VIN=2.7V to 7V VEN=VIN,VIN=2.7V to 7V VEN=0V,VIN=2.7V to 7V VIN=5V,Vo=0V,VEN0.5
_ _ _
0
_
115
_
1.0 1.215
_ _ _
1.2
_ _ _
1.23 1 7 0.4
Vo in regulation ISINK=0.4mA
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 2 of 8
ST2123
Elektronische Bauelemente
CMOS Positive Voltage Regulator
Note:
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
ST 2123-AD
Marking
3BAD2 XXXX
Output Voltage
Adjustable
Part Number
Marking
Output Voltage
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)
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01-Jun-2002 Rev. A
Page 3 of 8
ST2123
Elektronische Bauelemente
CMOS Positive Voltage Regulator
Characteristics Curve
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01-Jun-2002 Rev. A
Page 4 of 8
ST2123
Elektronische Bauelemente
CMOS Positive Voltage Regulator
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01-Jun-2002 Rev. A
Page 5 of 8
ST2123
Elektronische Bauelemente
CMOS Positive Voltage Regulator
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01-Jun-2002 Rev. A
Page 6 of 8
ST2123
Elektronische Bauelemente
External Resistor Divider Table
R1(K Ohm) Vout 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15 3.20 3.25 3.30
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CMOS Positive Voltage Regulator
1 14.29 9.00 6.57 5.17 4.26 3.63 3.16 2.79 2.51 2.27 2.08 1.91 1.77 1.65 1.55 1.46 1.37 1.30 1.23 1.71 1.12 1.07 1.03 0.98 0.95 0.91 0.88 0.85 0.82 0.79 0.77 0.74 0.72 0.70 0.68 0.66 0.64 0.63 0.61 0.60 0.58
2 28.59 18.00 13.14 10.34 8.53 7.25 6.31 5.59 5.01 4.54 4.15 3.83 3.55 3.31 3.10 2.91 2.75 2.60 2.47 2.35 2.24 2.14 2.05 1.97 1.89 1.82 1.75 1.69 1.64 1.58 1.53 1.49 1.44 1.40 1.36 1.32 1.29 1.26 1.22 1.19 1.17
5 71.47 45.00 32.84 25.85 21.32 18.13 15.78 13.97 12.53 11.36 10.38 9.57 8.87 8.27 7.74 7.28 6.86 6.50 6.17 5.87 5.60 5.35 5.13 4.92 4.73 4.55 4.39 4.23 4.09 3.96 3.83 3.72 3.61 3.50 3.40 3.31 3.22 3.14 3.06 2.99 2.91
10 142.94 90.00 65.68 51.70 42.63 36.27 31.56 27.93 25.05 22.71 20.77 19.13 17.74 16.53 15.48 14.55 13.73 12.99 12.34 11.74 11.20 10.70 10.25 9.84 9.46 9.10 8.77 8.47 8.18 7.92 7.67 7.43 7.21 7.00 6.81 6.62 6.45 6.28 6.12 5.97 5.83
20 285.88 180.00 131.35 103.40 85.26 72.54 63.12 55.86 50.10 45.42 41.54 38.27 35.47 33.06 30.96 29.10 27.46 25.99 24.67 23.48 22.40 21.41 20.51 19.68 18.91 18.20 17.55 16.93 16.36 15.83 15.33 14.86 14.42 14.01 13.61 13.24 12.89 12.56 12.24 11.94 11.65
50 714.71 450.00 328.38 258.51 213.16 181.34 157.79 139.66 125.26 113.55 103.85 95.67 88.69 82.65 77.39 72.75 68.64 64.97 61.68 58.70 55.99 53.52 51.27 49.19 47.28 45.51 43.86 42.33 40.91 39.58 38.33 37.16 36.05 35.01 34.03 33.11 32.23 31.40 30.60 29.85 11.65
100
200
500
1000
R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215)
517.02 426.32 362.69 315.58 279.31 250.52 227.10 207.69 191.34 177.37 165.33 154.78 145.51 137.29 129.95 123.35 117.39 111.98 107.05 102.53 98.38 94.55 91.01 87.73 84.67 81.82 79.15 76.66 74.13 72.11 70.03 68.07 66.21 64.46 62.79 61.21 59.71 58.27 852.63 725.37 631.17 558.62 501.03 454.21 415.38 382.68 354.74 330.61 309.55 291.02 274.58 259.89 246.70 234.78 223.96 214.10 205.06 196.76 189.11 182.02 175.45 169.34 163.64 158.31 153.31 148.62 144.21 140.06 136.13 132.43 128.91 125.58 122.42 119.41 116.55 826.53 773.89 727.54 686.44 649.73 616.75 586.96 559.91 535.24 512.66 491.90 472.76 455.06 438.63 423.34 409.09 395.77 383.28 371.56 360.53 350.14 340.34 331.06 322.28 313.95 306.05 298.53 291.37 877.26 846.69 818.18 791.53 766.56 743.12 721.07 700.29 680.67 662.13 644.56 627.91 612.09 597.05 582.73
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01-Jun-2002 Rev. A
Page 7of 8
ST2123
Elektronische Bauelemente
External Resistor Divider Table
R1(K Ohm) Vout 3.35 3.40 3.45 3.50 3.55 3.60 3.65 3.70 3.75 3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 0.57 0.56 0.54 0.53 0.52 0.51 0.50 0.49 0.48 0.47 0.46 0.45 0.44 0.44 0.43 0.42 0.41 0.41 0.40 0.39 0.39 0.38 0.38 0.37 0.36 0.36 0.35 0.35 0.34 0.34 0.33 0.33 0.33 0.32 1.14 1.11 1.09 1.06 1.04 1.02 1.00 0.98 0.96 0.94 0.92 0.91 0.89 0.87 0.86 0.84 0.83 0.81 0.80 0.79 0.78 0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.69 0.68 0.67 0.66 0.65 0.64 1 2 5 2.85 2.78 2.72 2.66 2.60 2.55 2.49 2.44 2.40 2.35 2.31 2.26 2.22 2.18 2.14 2.11 2.07 2.04 2.00 1.97 1.97 1.91 1.88 1.85 1.82 1.79 1.77 1.74 1.72 1.69 1.67 1.65 1.63 1.61 10 5.69 5.56 5.44 5.32 5.20 5.09 4.99 4.89 4.79 4.70 4.61 4.53 4.44 4.36 4.29 4.21 4.14 4.07 4.00 3.94 3.88 3.81 3.76 3.70 3.64 3.59 3.54 3.49 3.44 3.39 3.34 3.30 3.25 3.21 20 11.38 11.12 10.87 10.63 10.41 10.19 9.98 9.78 9.59 9.40 9.22 90.5 8.88 8.73 8.57 8.42 8.28 8.14 8.01 7.88 7.75 7.63 7.51 7.40 7.29 7.18 7.07 6.97 6.87 6.78 6.69 6.59 6.51 6.42 50 28.45 27.80 27.18 26.59 26.02 25.47 24.95 24.45 23.96 23.50 23.06 22.63 22.21 21.81 21.43 21.06 20.70 20.35 20.02 19.69 19.38 19.07 18.78 18.49 18.22 17.95 17.69 17.43 17.19 16.95 16.71 16.49 16.27 16.05 100 56.91 55.61 54.36 53.17 52.03 50.94 49.90 48.89 47.93 47.00 46.11 45.25 44.42 43.63 42.86 42.11 41.40 40.70 40.03 39.38 38.76 38.15 37.56 36.99 36.43 35.89 35.37 34.86 34.37 33.89 33.43 32.97 32.53 32.10 200 113.82 111.21 108.72 106.35 104.07 101.89 99.79 97.79 95.86 94.00 92.22 90.50 88.85 87.25 85.71 84.23 82.79 81.41 80.07 78.77 77.51 76.30 75.12 73.97 72.86 71.79 70.74 69.73 68.74 67.78 66.85 65.94 65.06 64.02 500 284.54 278.03 271.81 265.86 260.17 254.72 249.49 244.47 239.64 235.01 230.55 226.26 222.12 218.13 214.29 210.57 206.98 203.52 200.16 196.92 193.78 190.74 187.79 184.93 182.16 179.47 176.86 174.32 171.85 169.46 167.13 164.86 162.65 160.50 1000 569.09 556.06 543.62 531.73 520.34 509.43 498.97 488.93 479.29 470.02 461.10 452.51 444.24 436.27 428.57 421.14 413.97 407.04 400.33 393.84 387.56 381.48 375.58 369.86 364.32 358.94 353.71 348.64 343.71 338.91 334.25 329.72 325.30 321.00 R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215)
CMOS Positive Voltage Regulator
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
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Page 8 of 8

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