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ISSUED DATE :2005/01/24 REVISED DATE :
GT2123
Description
C M O S P o s i t i v e Vo l t a g e R eg u l a t o r
The GT2123 of positive, linear regulators feature low quiescent current (35 A typ.) with low dropout voltage, making them ideal for battery applications. This rugged device has 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 GT2123 is stable with an output capacitance of 2.2 F or greater.
Features & Low Dropout Voltage Very
Functional Block Diagram
Applications & Battery Powered Widgets
&Instrumentation &Wireless Devices &PC Peripherals &Portable Electronics &Cordless Phones &Electronic Scales
&Guaranteed 300mA output &Over-Temperature Shutdown &Current Limiting &Short Circuit Current Fold-back &Highly Accurate 1.5% &Adjustable output voltages &Power-saving Shutdown Mode &Power Good Detector &Low Temperature coefficient
Package Dimensions
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.
Typical Application Circuit
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Absolute Maximum Ratings
Parameter
Input Max Voltage Output Current Input, Output Voltage Operating Ambient Temperature Junction Temperature Maximum Junction Temperature Thermal Resistance Power Dissipation( T=100 : ) EDS Classification
Symbol
VIN IOUT Topr Tj Tj Max ja PD VIN=5V,
Ratings
8 PD/( VIN- VO) GND-0.3 to VIN+0.3 -40 ~ +85 -40 ~ +125 150 260 380 B
Unit
V mA V :
: /W mW
Electrical Characteristics Ta=25
Parameter Output Voltage Output Current Current Limit Load Regulation Dropout Voltage Ground Pin Current Line Regulation Input Voltage
Over Temperature Shutdown Over Temperature Hysterisis
unless otherwise noted
Condition Min
-1.5% 300 300 Note1 -
Symbol VO IO ILIM REGLOAD VDROPOUT IGND REGLINE VIN OTS OTH TC ISC PSRR
TYP
-
Max
1.5% 1 1300 400 300 0.15 0.1 7 300 1.23 VIN 0.4 0.1 0.5 1 0.1 85 1 7 0.4
Unit
V mA mA % mV A % V : : ppm/ : mA dB
VIN=5V, IO=1mA VIN=5V, VO>1.2 VIN=5V, VO>1.2 VIN=5V, IO=1mA to 300mA 1.5V450 0.2 35 0.02 150 30 30 150 60 50 20 30 1 1.215 0.5 -
Output Voltage Temperature Coefficient Short Circuit Current(Note2) Power Supply Rejection
VIN=5V, VOUT<0.8V f=100Hz VIN=5V Io=100mA f=1kHz Co=2.2 f f=10kHz f=10Hz~100kHz Io=10mA C BYP=0 F Co=2.2 F
1.2 2.0 0 0 115 -
Output Voltage Noise
ADJ Input Bias Current ADJ Reference Voltage
eN IADJ VREF VEH VEL IEH IEL ISD VO,SD VUV VOV ILC VPG VOL
Vrms A O V V A A A V %Vo(NOM) %Vo(NOM) A V V
EN Input Threshold EN Input Bias Current Shutdown Supply Current Shutdown Output Voltage Output Under Voltage Output Over Voltage PG Leakage Current PG Voltage Rating PG Voltage Low
Note 1: VIN (MIN) =VOUT+VDROPOUT
VIN=2.7V to 7V VIN=2.7V to 7V VEN=VIN, VIN=2.7V to 7V VEN= 0V, VIN=2.7V to 7V VIN=5V, VO=0V, VENVPG=7V VO in regulation
ISINK=0.4mA
2: To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage must be applied before a current source load is applied.
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ISSUED DATE :2005/01/24 REVISED DATE :
Ordering Information ( contd. )
Part Number GT2123-AD
XXXX
Marking 3BAD2
Output Voltage Adjustable
Part Number
Marking
Output Voltage
The GT2123 of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, 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 a precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds 150 : , or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 : . The GT2123 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GT2123 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.
Detailed Description
The GT2123 is stable with an output capacitance to ground of 2.2 F or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic 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 F ceramic capacitor with a 10 F 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 0.1 F to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection.
External Capacitors
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 1 A. This pin behaves much like an electronic switch.
Enable
Power Good
The GT2123 includes the Power Good feature. When the output is not within D 10% of the specified voltage, it pulls low. This can occur under the following conditions: 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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Characteristics Curve
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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 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 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 1 2 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 11.65 517.02 426.32 362.69 315.58 279.31 250.52 227.10 207.69 191.34 177.37 165.33 154.78 145.51 137.29 129.95 123.35 117.39 111.98 107.05 102.53 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 7/8 100 200 500 1000 R2(K Ohm)=(1.215*R1(K Ohm))/(VOUT-1.215)
ISSUED DATE :2005/01/24 REVISED DATE :
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)
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
Important Notice: All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM. GTM reserves the right to make changes to its products without notice. GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems. GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office And Factory: Taiwan: No. 17-1 Tatung Rd. Fu Kou Hsin-Chu Industrial Park, Hsin-Chu, Taiwan, R. O. C. TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785 China: (201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165
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