LT1033CT

LT1033 NOT RECOMMENDED FOR NEW DESIGNS Contact Linear Technology for Potential Replacement 3A Negative Adjustable Regulator DESCRIPTIO U Current Limit 6 35 LT1033 • G01 FEATURES s s s Guaranteed 1% Initial Voltage Tolerance Guaranteed 0.015%/V Line Regulation Guaranteed 0.02%/ W Thermal Regulation PRECO DITIO I G s The LT®1033 negative adjustable regulator will deliver up to 3A output current over an output voltage range of –1.2V to –32V. Linear Technology has made significant improvements in these regulators compared to previous devices, such as better line and load regulation, and a maximum output voltage error of 1%. The LT1033 is easy to use and difficult to damage. Internal current and power limiting as well as true thermal limiting prevents device damage due to overloads or shorts, even if the regulator is not fastened to a heat sink. Maximum reliability is attained with Linear Technology’s advanced processing techniques combined with a 100% burn-in in the thermal limit mode. This assures that all device protection circuits are working and eliminates field failures experienced with other regulators that receive only standard electrical testing. , LTC and LT are registered trademarks of Linear Technology Corporation. 100% Thermal Limit Burn-in APPLICATIO S s s s s Adjustable Power Supplies System Power Supplies Precision Voltage/Current Regulators On-Card Regulators TYPICAL APPLICATIO Negative 5V Regulator R2 301Ω 2µF TANT ADJ –VIN IN LT1033 OUT LT1033 • TA01 + OUTPUT CURRENT (A) U UU U U + 5 2µF TANT 4 3 2 1 0 0 5 10 15 20 25 30 INPUT-OUTPUT DIFFERENTIAL (V) R1 100Ω –5V, 3A 1033fc 1 LT1033 ABSOLUTE AXI U RATI GS (Note 1) Storage Temperature Range LT1033M (OBSOLETE) ............................... –65°C to 150°C LT1033C ..................................................... –65°C to 150°C Lead Temperature (Soldering, 10 sec.) ........................ 300°C Power Dissipation ....................................... Internally Limited Input to Output Voltage Differential ................................. 35V Operating Junction Temperature Range LT1033M (OBSOLETE) ............................... –55°C to 150°C LT1033C ......................................................... 0°C to 125°C PACKAGE/ORDER I FOR ATIO BOTTOM VIEW 1 2 ADJ VOUT CASE IS VIN K PACKAGE 4-LEAD TO-3 METAL CAN TJMAX = 150°C, θJA = 35°C/W(MK) TJMAX = 125°C, θJA = 35°C/W(CK) CASE IS VIN T PACKAGE 3-LEAD PLASTIC TO-220 TJMAX = 125°C, θJA = 50°C/W OBSOLETE PACKAGE Consider the P or T Packages for Alternate Source ORDER PART NUMBER LT1033MK LT1033CK ORDER PART NUMBER LT1033CT Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS (Note 2) SYMBOL PARAMETER VREF Reference Voltage CONDITIONS |VIN – VOUT| = 5V, IOUT = 5mA, TJ = 25°C 3V ≤ |VIN – VOUT| ≤ 35V 5mA ≤ IOUT ≤ IMAX, P ≤ PMAX ∆VOUT ∆IOUT Load Regulation 10mA ≤ IOUT ≤ IMAX, (Note 3) TJ = 25°C,|VOUT| ≤ 5V TJ = 25°C,|VOUT| ≥ 5V |VOUT| ≤ 5V |VOUT| ≥ 5V 3V ≤ |VIN – VOUT| ≤ 35V, (Note 2) TJ = 25°C The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. MIN –1.238 q ∆VOUT ∆VIN Line Regulation Ripple Rejection VOUT = –10V, f = 120Hz CADJ = 0 CADJ = 10µF TJ = 25°C, 10ms Pulse Thermal Regulation 2 U U W WW U W FRONT VIEW VOUT VIN ADJ CASE IS VIN FRONT VIEW VOUT VIN ADJ P PACKAGE 3-LEAD PLASTIC TO-3P TJMAX = 125°C, θJA = 35°C/W ORDER PART NUMBER LT1033CP LT1033M TYP –1.250 –1.250 10 0.2 20 0.4 0.005 0.01 MAX –1.262 –1.285 50 1.0 75 1.5 0.015 0.04 MIN –1.238 –1.200 LT1033C TYP –1.250 –1.250 10 0.2 20 0.4 0.01 0.02 60 77 0.002 MAX –1.262 –1.300 50 1.0 75 1.5 0.02 0.05 UNITS V V mV % mV % %/V %/V dB dB –1.215 q q q 56 70 66 80 0.002 0.02 66 0.02 %/W 1033fc LT1033 ELECTRICAL CHARACTERISTICS (Note 2) SYMBOL PARAMETER IADJ ∆IADJ Adjust Pin Current Adjust Pin Current Change Minimum Load Current ISC ∆VOUT ∆Temp ∆VOUT ∆Time en θJC Current Limit Temperature Stability of Output Voltage Long Term Stability RMS Output Noise (% of VOUT) Thermal Resistance Junction to Case 10mA ≤ IOUT ≤ IMAX 3V ≤ |VIN – VOUT| ≤ 35V |VIN – VOUT| ≤ 35V |VIN – VOUT| ≤ 10V |VIN – VOUT| ≤ 10V, (Note 3) |VIN – VOUT| = 35V, TJ = 25°C TMIN ≤ T ≤ TMAX TA = 125°C, 1000 Hours TA = 25°C, 10Hz ≤ f ≤ 10kHz T Package K Package P Package CONDITIONS The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. MIN q q q LT1033M TYP 65 0.2 1.0 2.5 1.2 MAX 100 2 5 5.0 3.0 6 2.5 1.5 1.0 MIN LT1033C TYP 65 0.5 2 2.5 1.2 MAX 100 2 5 5.0 3.0 6 2.5 1.5 1.0 UNITS µA µA µA mA mA A A % % % 3 0.5 q 4.3 1.3 0.6 0.3 0.003 3 0.5 4.3 1.3 0.6 0.3 0.003 2.5 1.2 1.8 1.2 2.0 4.0 2.0 2.7 °C/W °C/W °C/W Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Unless otherwise indicated, these specifications apply: |VIN – VOUT| = 5V; and IOUT = 5mA. Power dissipation is internally limited. However, these specifications apply for power dissipation up to 30W. See guaranteed minimum output current curve. IMAX = 3A. Note 3: Testing is done using a pulsed low duty cycle technique. See thermal regulation specifications for output changes due to heating effects. Load regulation is measured on the output pin at a point 1/8" below the base of the package. TYPICAL PERFOR A CE CHARACTERISTICS Dropout Voltage 2.8 INPUT-OUTPUT DIFFERENTIAL (V) 2.6 REFERENCE VOLTAGE (V) 2.4 2.2 2.0 1.8 1.6 1.4 1.2 0.5 1.0 2.0 1.5 OUTPUT CURRENT (A) 2.5 3.0 TJ = –55°C TJ = 25°C TJ = 150°C CURRENT (mA) UW LT1033 • G02 Temperature Stability 1.27 1.8 1.6 Minimum Load Current TJ = –55°C 1.26 1.4 1.2 1.0 0.8 0.6 0.4 0.2 TJ = 150°C 1.25 TJ = 25°C 1.24 1.23 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) LT1033 • G03 0 0 10 30 20 INPUT-OUTPUT DIFFERENTIAL (V) 40 LT1033 • G04 1033fc 3 LT1033 TYPICAL PERFORMANCE CHARACTERISTICS Ripple Rejection 100 CADJ = 10µF RIPPLE REJECTION (dB) 80 RIPPLE REJECTION (dB) RIPPLE REJECTION (dB) 60 CADJ = 0 40 VIN – VOUT = 5V 20 IL = 500mA f = 120Hz TJ = 25°C 0 0 –10 –20 –30 OUTPUT VOLTAGE (V) Output Impedance 101 OUTPUT VOLTAGE DEVIATION (V) VIN = –15V VOUT = –10V IL = 500mA CL = 1µF TJ = 25°C OUTPUT VOLTAGE DEVIATION (V) OUTPUT IMPEDANCE (Ω) 100 10–1 CADJ = 0 CADJ = 10µF –0.4 INPUT VOLTAGE CHANGE (V) LOAD CURRENT (A) 10–2 10–3 10 100 1k 10k FREQUENCY (Hz) Load Regulation* 5 0.8 OUTPUT VOLTAGE DEVIATION (%) 4 0.4 OUTPUT CURRENT (A) ADJUSTMENT CURRENT (µA) 0 –0.4 –0.8 0 0.8 1.6 2.4 3.2 OUTPUT CURRENT (A) 4.0 *THE LT1033 HAS LOAD REGULATION COMPENSATION WHICH MAKES THE TYPICAL UNIT READ CLOSE TO ZERO. THIS BAND REPRESENTS THE TYPICAL PRODUCTION SPREAD LT1033 • G11 4 UW –40 LT1033 • G05 Ripple Rejection 100 100 Ripple Rejection 80 80 CADJ = 10µF 60 CADJ = 0 60 CADJ = 0 40 VIN = –15V VOUT = –10V IL = 500mA TJ = 25°C 10 100 CADJ = 10µF 40 VIN = –15V VOUT = –10V f = 120Hz TJ = 25°C 0.1 1 OUTPUT CURRENT (A) 10 LT1033 • G07 20 20 0 1k 10k FREQUENCY (Hz) 100k 1M 0 0.01 LT1033 • G06 Line Transient Response 0.8 0.6 0.4 0.2 0 –0.2 CADJ = 10µF CADJ = 0 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 0 –0.5 –1.0 –1.5 Load Transient Response CADJ = 0 CADJ = 10µF 0 –0.5 –1.0 0 VOUT = –10V IL = 50mA TJ = 25°C CL = 1µF 10 20 TIME (µs) 30 40 LT1033 • G09 VIN = –15V VOUT = –10V INL = 50mA TJ = 25°C CL = 1µF 0 10 20 TIME (µs) 30 40 LT1033 • G10 100k 1M LT1033 • G08 Guaranteed Minimum Output Current 80 75 70 65 60 55 Adjustment Current 3 2 1 0 0 5 10 15 20 25 30 INPUT-OUTPUT DIFFERENTIAL (V) 35 50 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) LT1033 • G13 LT1033 • G12 1033fc LT1033 APPLICATIONS INFORMATION Output Voltage The output voltage is determined by two external resistors, R1 and R2 (see Figure 1). The exact formula for the output voltage is:  R2  VOUT = VREF  1 +  + IADJ (R2)  R1 Where: VREF = Reference Voltage, IADJ = Adjustment Pin Current. In most applications, the second term is small enough to be ignored, typically about 0.5% of VOUT. In more critical applications, the exact formula should be used, with IADJ equal to 65µA. Solving for R2 yields: R2 = VOUT – VREF VREF – IADJ R1 which must be absorbed, is 5mA for the LT1033. If inputoutput voltage differential is less than 10V, the operating current that must be absorbed drops to 3mA. Capacitors and Protection Diodes An output capacitor, C3, is required to provide proper frequency compensation of the regulator feedback loop. A 2µF or larger solid tantalum capacitor is generally sufficient for this purpose if the 1MHz impedance of the capacitor is 1Ω or less. High Q capacitors, such as Mylar, are not recommended because their extremely low ESR (effective series resistance) can drastically reduce phase margin. When these types of capacitors must be used because of other considerations, add a 0.5Ω carbon resistor in series with 1µF. Aluminum electrolytic capacitors may be used, but the minimum value should be 25µF to ensure a low impedance at 1MHz. The output capacitor should be located within a few inches of the regulator to keep lead impedance to a minimum. The following caution should be noted: if the output voltage is greater than 6V and an output capacitor greater than 20µF has been used, it is possible to damage the regulator if the input voltage becomes shorted, due to the output capacitor discharging into the regulator. This can be prevented by using diode D1 (see Figure 2) between the input and the output. The input capacitor, C2, is only required if the regulator is more than 4 inches from the raw supply filter capacitor. Bypassing the Adjustment Pin The adjustment pin of the LT1033 may be bypassed with a capacitor to ground, C1, to reduce output ripple, noise, and impedance. These parameters scale directly with output voltage if the adjustment pin is not bypassed. A bypass capacitor reduces ripple, noise and impedance to that of a 1.25V regulator. In a 15V regulator for example, these parameters are improved by 15V/1.25V = 12 to 1. This improvement holds only for those frequencies where the impedance of the bypass capacitor is less than R1. Ten microfarads is generally sufficient for 60Hz power line applications where the ripple frequency is 120Hz, since XC = 130Ω. The capacitor should have a voltage rating at least as high as the output voltage of the regulator. Values 1033fc Smaller values of R1 and R2 will reduce the influence of IADJ on the output voltage, but the no-load current drain on the regulator will be increased. Typical values for R1 are between 100Ω and 300Ω, giving 12.5mA and 4.2mA no-load current respectively. There is an additional consideration in selecting R1, the minimum load current specification of the regulator. The operating current of the LT1033 flows from input to output. If this current is not absorbed by the load, the output of the regulator will rise above the regulated value. The current drawn by R1 and R2 is normally high enough to absorb the current, but care must be taken in no-load situations where R1 and R2 have high values. The maximum value for the operating current, + + C2 5µF ADJ –VIN VIN LT1033 LT1033 • F01 C1 10µF R2 IADJ VREF R1 –VOUT + C3 2µF VOUT EXAMPLE: 1. A PRECISION 10V REGULATOR TO SUPPLY UP TO 3A LOAD CURRENT. A. SELECT R1 = 100Ω TO MINIMIZE EFFECT OF IADJ B. CALCULATE R2 = VOUT – VREF 10V – 1.25V = = 704Ω VREF 1.25V – 65µA – IADJ 100Ω R1 Figure 1 U W U U 5 LT1033 APPLICATIONS INFORMATION larger than 10µF may be used, but if the output is larger than 25V, a diode, D2, should be added between the output and adjustment pins (see Figure 2). + Proper Connection of Divider Resistors The LT1033 has a load regulation specification of 0.8% and is measured at a point 1/8" from the bottom of the package. To prevent degradation of load regulation, the resistors which set output voltage, R1 and R2, must be connected as shown in Figure 3. Note that the positive side of the load has a true force and sense (Kelvin) connection, but the negative side of the load does not. R1 should be connected directly to the output lead of the regulator, as close as possible to the specified point 1/8" from the case. R2 should be connected to the positive side of the load separately from the positive (ground) connection to the raw supply. With this arrangement, load regulation is degraded only by the resistance between the regulator output pin and the load. If R1 is connected to the load, regulation will be degraded. ADJ –VIN VIN LT1033 CONNECT R1 DIRECTLY TO REGULATOR PIN VOUT LT1033 • F03 6 U W U U C1 R2 + R1 D2** 1N4002 ADJ –VIN VIN LT1033 D1* 1N4002 LT1033 • F02 C3 VOUT –VOUT *D1 PROTECTS THE REGULATOR FROM INPUT SHORTS TO GROUND. IT IS REQUIRED ONLY WHEN C3 IS LARGER THAN 20µF AND VOUT IS LARGER THAN 6V ** D2 PROTECTS THE ADJUST PIN OF THE REGULATOR FROM OUTPUT SHORTS IF C2 IS LARGER THAN 10µF AND VOUT IS LARGER THAN –25V Figure 2 LEAD RESISTANCE HERE DOES NOT AFFECT LOAD REGULATION R2 LOAD R1 LEAD RESISTANCE HERE DEGRADES LOAD REGULATION. MINIMIZE THE LENGTH OF THIS LEAD Figure 3 1033fc LT1033 TYPICAL APPLICATIO S The output stability, load regulation, line regulation, thermal regulation, temperature drift, long term drift, and noise can be improved by a factor of 6.6 over the standard regulator configuration. This assumes a zener whose drift and noise is considerably better than the regulator itself. The LM329B has 20ppm/°C maximum drift and about 10 times lower noise than the regulator. In the application shown below, regulators #2 to “N” will track regulator #1 to within ±24mV initially, and to ±60mV over all load, line, and temperature conditions. If any regulator output is shorted to ground, all other outputs will drop to ≈ –2V. Load regulation of regulators #2 to “N” will be improved by VOUT/1.25V compared to a standard regulator, so regulator #1 should be the one which has the lowest load current. Multiple Tracking Regulators + C3 –VIN VIN LT1033 *R2 = + 10µF 2µF ADJ 1N4002 –VIN VIN REG #1 VOUT LT1033 + 2µF ADJ VIN REG #2 VOUT LT1033 1N4002 + 2µF ADJ VIN REG #N VOUT LT1033 U High Stability Regulator 7V LM329B R3 1.5k 1% ADJ VOUT |VOUT| 9.08 • 10–3 –VOUT – 908Ω LT1033 • TA06 R2* R1 1k 1% + 1µF SOLID TANTALUM Dual Tracking 3A Supply ± 1.25V to ± 20V LT150A +VIN VIN ADJ R1** 100Ω 1% VOUT +VOUT + R2 2.2µF* + R1 120Ω D1 1N4002 C1 2µF SOLID TANTALUM –VOUT1 10µF + + R2 5k 1% R4 5k 1% R3 5k 10µF R5** 100Ω 1% + 2.2µF* D2 1N4002 + 2µF SOLID TANTALUM –VOUT2 ADJ –VIN VIN LT1033 *SOLID TANTALUM **R1 OR R5 MAY BE TRIMMED SLIGHTLY TO IMPROVE TRACKING VOUT –VOUT LT1033 • TA07 + 2µF SOLID TANTALUM –VOUT3 LT1033 • TA05 Current Regulator + ADJ (–) VIN LT1033 VOUT RS (O.5Ω ≤ RS ≤ 250Ω) I I = 65µA + 1.25V RS LT1033 • TA08 C1 2µF SOLID TANTALUM (+) 1033fc 7 LT1033 SCHE ATIC DIAGRA D1 Q6 750Ω Q7 60k 100k Q13 4k Q22 12k 1k Q14 270Ω Q16 Q15 Q17 4.2k 8k Q18 Q19 20k Q20 600Ω 4k 8 W ADJ 2k Q1 Q3 Q2 20k Q4 15pF VOUT D2 D3 800Ω Q32 Q34 5k 600Ω 18k Q8 Q33 Q9 20Ω 20Ω Q25 6.8k Q23 5pF 15k 460Ω 2pF 12k Q26 250Ω 12k Q10 Q12 15pF 2k 25pF Q11 220Ω D4 2k D5 100k Q24 Q21 Q27 Q28 Q31 Q30 2k 6k 1k 1k Q29 2.4k 500Ω 100Ω VIN LT1033 • SC01 W 150Ω 10Ω 100Ω 0.02Ω 1033fc LT1033 PROGRAM RESISTOR SELECTIO The following table allows convenient selection of program resistors from standard 1% values. VOUT 5 6 8 10 12 15 18 20 22 24 28 30 R1 100 121 115 115 118 100 150 121 130 121 115 121 R2 301 453 619 806 1020 1100 2000 1820 2150 2210 2430 2740 OUTPUT ERROR (%) 0.6 –0.7 0.6 0.6 1.0 0.5 0.2 0.8 0.2 0.9 –0.7 –0.9 PACKAGE DESCRIPTION K Package 2-Lead TO-3 Metal Can (Reference LTC DWG # 05-08-1310) 0.760 – 0.775 (19.30 – 19.69) 0.060 – 0.135 (1.524 – 3.429) 0.320 – 0.350 (8.13 – 8.89) 0.420 – 0.480 (10.67 – 12.19) 1.177 – 1.197 (29.90 – 30.40) 0.655 – 0.675 (16.64 – 17.15) 0.210 – 0.220 (5.33 – 5.59) 0.151 – 0.161 (3.86 – 4.09) DIA, 2PLCS 0.167 – 0.177 (4.24 – 4.49) R 0.067 – 0.077 (1.70 – 1.96) 0.490 – 0.510 (12.45 – 12.95) R 0.425 – 0.435 (10.80 – 11.05) U 0.038 – 0.043 (0.965 – 1.09) U W OBSOLETE PACKAGE 1033fc K2 (TO-3) 1098 9 LT1033 PACKAGE DESCRIPTION T Package 3-Lead Plastic TO-220 (Reference LTC DWG # 05-08-1420) 0.147 – 0.155 (3.734 – 3.937) DIA 0.230 – 0.270 (5.842 – 6.858) 0.460 – 0.500 (11.684 – 12.700) 0.570 – 0.620 (14.478 – 15.748) 0.330 – 0.370 (8.382 – 9.398) 0.390 – 0.415 (9.906 – 10.541) 0.980 – 1.070 (24.892 – 27.178) 0.520 – 0.570 (13.208 – 14.478) 0.100 (2.540) BSC 0.028 – 0.038 (0.711 – 0.965) 10 U 0.165 – 0.180 (4.191 – 4.572) 0.045 – 0.055 (1.143 – 1.397) 0.218 – 0.252 (5.537 – 6.401) 0.013 – 0.023 (0.330 – 0.584) 0.050 (1.270) TYP 0.095 – 0.115 (2.413 – 2.921) T3 (TO-220) 1098 1033fc LT1033 PACKAGE DESCRIPTION P Package 3-Lead Plastic TO-3P (Similar to TO-247) (Reference LTC DWG # 05-08-1450) 0.560 (14.224) 0.325 (8.255) 0.275 (6.985) 0.580 (14.732) 0.700 (17.780) 0.830 – 0.870 (21.08 – 22.10) 0.580 – 0.6OO (14.73 – 15.24) 0.098 (2.489) 0.124 (3.149) 0.780 – 0.800 (19.81 – 20.32) BOTTOM VIEW OF TO-3P HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U 0.620 – 0.64O (15.75 – 16.26) 0.187 – 0.207 (4.75 – 5.26) MOUNTING HOLE 18° – 22° 0.115 – 0.145 (2.92 – 3.68) DIA 0.060 – 0.080 (1.52 – 2.03) 0.170 – 0.2OO (4.32 – 5.08) EJECTOR PIN MARKS 0.105 – 0.125 (2.67 – 3.18) DIA 3° – 7° 0.170 (4.32) MAX 0.042 – 0.052 (1.07 – 1.32) 0.074 – 0.084 (1.88 – 2.13) 0.215 (5.46) BSC 0.113 – 0.123 (2.87 – 3.12) 0.087 – 0.102 (2.21 – 2.59) 0.020 – 0.040 (0.51 – 1.02) P3 0996 1033fc 11 LT1033 RELATED PARTS PART NUMBER LT1120 LT1121 LT1129 LT1175 LT1374 LT1521 LT1529 LT1573 LT1575 LT1735 LT1761 Series LT1762 Series LT1763 Series LT1764 LT1962 LT1963 DESCRIPTION 125mA Low Dropout Regulator with 20µA IQ 150mA Micropower Low Dropout Regulator 700mA Micropower Low Dropout Regulator 500mA Negative Low Dropout Micropower Regulator 4.5A, 500kHz Step-Down Converter 300mA Low Dropout Micropower Regulator with Shutdown 3A Low Dropout Regulator with 50µA IQ UltraFast™ Transient Response Low Dropout Regulator UltraFast Transient Response Low Dropout Regulator Synchronous Step-Down Converter 100mA, Low Noise, Low Dropout Micropower Regulators in SOT-23 150mA, Low Noise, LDO Micropower Regulators 500mA, Low Noise, LDO Micropower Regulators 3A, Low Noise, Fast Transient Response LDO 300mA, Low Noise, LDO Micropower Regulator 1.5A, Low Noise, Fast Transient Response LDO COMMENTS Includes 2.5V Reference and Comparator 30µA IQ, SOT-223 Package 50µA Quiescent Current 45µA IQ, 0.26V Dropout Voltage, SOT-223 Package 4.5A, 0.07Ω Internal Switch, SO-8 Package 15µA IQ, Reverse Battery Protection 500mV Dropout Voltage Drives External PNP Drives External N-Channel MOSFET High Efficiency, OPTI-LOOP® Compensation 20µA Quiescent Current, 20µVRMS Noise, SOT-23 Package 25µA Quiescent Current, 20µVRMS Noise, MSOP Package 30µA Quiescent Current, 20µVRMS Noise, SO-8 Package 40µVRMS Noise 20µVRMS Noise, MSOP Package 40µVRMS Noise, SOT-223 Package OPTI-LOOP is a registered trademark of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. 1033fc 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q LT/CPI 0102 1.5K REV C • PRINTED IN USA www.linear.com © LINEAR TECHNOLOGY CORPORATION 1991