LT1120CN8#PBF

LT1120 Micropower Regulator with Comparator and Shutdown U FEATURES DESCRIPTIO ■ The LT®1120 is a combination micropower positive regulator and free collector comparator on a single monolithic chip. With only 40μA supply current, the LT1120 can supply over 125mA of output current. Input voltage range is from 4.5V to 36V and dropout voltage is 0.6V at 125mA. Dropout voltage decreases with lower load currents. Also included on the chip is a class B output 2.5V reference that can either source or sink current. A shutdown pin allows logic shutdown of the output. ■ ■ ■ ■ ■ ■ ■ ■ 40μA Supply Current 125mA Output Current 2.5V Reference Voltage Reference Output Sources 2mA and Sinks 2mA Open Collector Comparator Sinks 10mA Logic Shutdown 0.2V Dropout Voltage Thermal Limiting Available in 8-Lead DIP and SO Packages U APPLICATIO S ■ ■ ■ ■ ■ The comparator can be used for system or battery monitoring. For example, the comparator can be used to warn of low system voltage. Frequency compensation of the comparator for amplifier applications can be obtained by adding external output capacitance. Battery Systems Battery-Backup System Portable Terminals Portable Instruments Memory Keep-Alive The 2.5V reference will source or sink current. This allows it to be used as a supply splitter or auxiliary output. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO Dropout Voltage and Supply Current 1.00 10 0.10 1 VIN VOUT 4 0.001μF LT1120 + 10μF SHDN 3 SHUTDOWN 5V FB GND 1 1M + 2 25μF 1M 1120 TA01 0.01 0.1 10 100 1 OUTPUT CURRENT (mA) SUPPLY CURRENT (mA) 5 VIN > 5.2V IQ = 40μA DROPOUT VOLTAGE (V) 5V Regulator 0.1 1000 1120 TA02 1120fd 1 LT1120 W W U W ABSOLUTE AXI U RATI GS (Note 1) Input Voltage ........................................................... 36V NPN Collector Voltage ............................................. 36V Output Short-Circuit Duration .......................... Indefinite Power Dissipation ............................... Internally Limited Operating Temperature Range LT1120C ................................................ 0°C to 100°C LT1120I ................................................ – 40 to 100°C Storage Temperature Range ................. – 65°C to 150°C U W U PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER TOP VIEW GND 1 8 –INPUT FB 2 7 COMPOUT SHDN 3 6 REF VOUT 4 5 VIN S8 PACKAGE N8 PACKAGE 8-LEAD PLASTIC SO 8-LEAD PDIP TJMAX = 110°C, θJA = 130°C/W (N) TJMAX = 110°C, θJA = 150°C/W (S) LT1120CN8 LT1120CS8 LT1120IN8 LT1120IS8 –INPUT LT1120CH 8 7 COMPOUT GND 1 6 REF FB 2 SHDN 3 4 S8 PART MARKING 1120 1120I ORDER PART NUMBER TOP VIEW 5 VIN VOUT H PACKAGE 8-LEAD TO-5 METAL CAN TJMAX = 150°C, θJA = 150°C/W, θJC = 45°C/W ORDER PART NUMBER J8 PACKAGE 8-LEAD CERDIP TJMAX = 150°C, θJA = 100°C/W (J) LT1120CJ8 OBSOLETE PACKAGES Consider the N8 and S8 Packages for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Tj = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Reference Voltage 4.5V ≤ VIN ≤ 36V 2.46 2.50 2.54 V Line Regulation 4.5V ≤ VIN ≤ 36V 0.01 0.015 %/V Load Regulation –2mA ≤ IREF ≤ 2mA, VIN = 12V 0.3 0.6 Output Source Current VIN = 5V 2 Output Sink Current VIN = 5V 2 Reference Temperature Stability % 4 mA 4 mA 1 % Regulator Supply Current VIN = 6V, IOUT ≤ 100μA VIN = 36V, IOUT ≤ 100μA VIN = 12V, IOUT = 125mA Output Current (VIN – VOUT) ≥ 1V, VIN ≥ 6V Load Regulation (VIN – VOUT) ≥ 1V, VIN ≥ 6V 0.2 0.5 Line Regulation 6V ≤ VIN ≤ 36V 0.01 0.015 %/V Dropout Voltage IOUT = 100μA IOUT = 125mA 0.02 0.4 0.05 0.65 V V 45 75 11 80 100 20 125 μA μA mA mA % 1120fd 2 LT1120 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Tj = 25°C. PARAMETER CONDITIONS Feedback Sense Voltage VIN = 12V Shutdown Pin Voltage TYP MAX 2.44 2.5 2.56 V 0.4 V Normal VOUT ≤ 0.5V Shutdown Pin Current MIN Shutdown 2.2 VIN = 1.4V Feedback Bias Current UNITS 1.4 V 25 μA 15 40 nA Minimum Load Current VIN = 36V 1 5 μA Short-Circuit Current VIN = 36V 300 400 mA Comparator Offset Voltage VIN = 36V 3 7 mV Bias Current VIN = 36V (Note 2) 15 40 nA Gain ΔVOUT = 29V, RL = 20k 2000 10000 V/V Power Supply Rejection 4.5V ≤ VS ≤ 36V 80 96 dB Output Sink Current VIN = 4.5V 10 18 mA Saturation Voltage IOUT = 1mA 0.4 Input Voltage Range 0 Response Time 0.6 V VIN – 1 V μs 5 Leakage Current μA 2 The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS 2.40 2.50 2.55 V Reference Reference Voltage 4.5V ≤ VIN ≤ 36V ● Line Regulation 4.5V ≤ VIN ≤ 36V ● 0.01 0.02 %/V Load Regulation – 2mA ≤ IREF ≤ 2mA, VIN = 12V ● 0.4 0.8 % Output Source Current VIN = 5V ● 2 mA Output Sink Current VIN = 5V ● 2 mA Supply Current VIN = 6V, IOUT ≤ 100μA VIN = 36V, IOUT ≤ 100μA VIN = 12V, IOUT = 125mA ● ● ● Output Current (VIN – VOUT) ≥ 1V, VIN ≥ 6V ● Load Regulation (VIN – VOUT) ≥ 1V, VIN ≥ 6V ● 1 Line Regulation 6V ≤ VIN ≤ 36V ● 0.02 %/V Dropout Voltage IOUT = 100μA IOUT = 125mA ● ● 0.06 0.85 V V Feedback Sense Voltage VIN = 12V ● Regulator Feedback Bias Current 65 85 11 95 100 20 125 mA 2.57 V 50 nA 50 μA 400 mA VIN = 36V ● Short-Circuit Current VIN = 36V ● 2.5 % ● Minimum Load Current 2.38 μA μA mA 300 1120fd 3 LT1120 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Comparator ● Offset Voltage Bias Current VIN = 36V (Note 2) ● Gain ΔVOUT = 29V, RL = 20k ● 1000 Output Sink Current VIN = 4.5V (Note 3) ● 5 Leakage Current VIN = 36V ● Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. 15 10 mV 60 nA V/V 10 mA μA 8 Note 2: TA > 85°C, I bias maximum is 100nA. Note 3: For TA ≤ – 40°C output current sink drops to 2.5mA. U W TYPICAL PERFOR A CE CHARACTERISTICS Regulator Load Regulation Supply Current 0.3 350 TJ = –55°C TJ = –55°C TO 125°C TJ = 25°C 0.1 0 TJ = 125°C –0.1 SHORT-CIRCUIT CURRENT (mA) 0.2 SUPPLY CURRENT (mA) OUTPUT VOLTAGE CHANGE (%) Regulator Short-Circuit Current 100 10 1 0.1 –0.2 PRELOAD = 100μA –0.3 0.1 1 10 100 OUTPUT CURRENT (mA) 0.01 0.1 1000 200 150 100 CURRENT LIMIT TIED TO GROUND 50 30 70 110 TEMPERATURE (°C) 150 1120 G03 Regulator Minimum Load Current 1 Regulator Ripple Rejection 70 100 ΔVOUT = 100mV RIPPLE REJECTION (dB) MINIMUM LOAD CURRENT (μA) 65 0.1 10 IOUT = 100mA 60 55 IOUT = 10mA 50 IOUT = 1mA 45 40 VIN = 10VDC, 1VP–P VOUT = 5V COUT = 10μF 35 0.01 0.1 –10 1120 G02 Dropout Voltage REGULATOR INPUT-OUTPUT DIFFERENTIAL (V) 250 0 –50 10 100 1000 1 REGULATOR OUTPUT CURRENT (mA) 1120 G01 300 30 1 10 100 1000 1 REGULATOR OUTPUT CURRENT (mA) 1120 G04 70 80 90 100 110 120 130 140 150 TEMPERATURE (°C) 1120 G05 10 100 1k 10k RIPPLE FREQUENCY (Hz) 100k 1120 G06 1120fd 4 LT1120 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current Supply Current at Dropout 10 10 TJ = –55°C TO 125°C SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) IOUT = 100mA 1 IOUT = 10mA 0.1 IOUT = 1mA IOUT = 100mA 1 IOUT = 10mA 0.1 IOUT = 1mA VOUT = 5V TJ = –55°C TO 125°C 0.01 0.01 1 5 10 15 20 25 REGULATOR INPUT-OUTPUT DIFFERENTIAL (V) 1 0.1 0.2 0.3 0.4 0.5 0.6 REGULATOR INPUT-OUTPUT DIFFERENTIAL (V) 1120 G07 1120 G08 Feedback Pin Current 4 40 3 35 FEEDBACK CURRENT (nA) REFERENCE VOLTAGE CHANGE (mV) Reference Regulation 2 1 0 –1 –2 30 TJ = –55°C 25 20 TJ = 25°C 15 10 TJ = 125°C 5 –3 –4 –1.5 –1.0 –0.5 0 0.5 1.0 REFERENCE OUTPUT CURRENT (mA) 0 0.1 1.5 1 10 100 1000 REGULATOR OUTPUT CURRENT (mA) 1120 G11 1120 G09 LT1120 Turn-On Characteristic 5.5 0.1 VIN = 15V VOUT = 5V 0 –0.1 OUTPUT CURRENT (mA) VOUT = 5V 5.0 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE CHANGE (%) Regulator Thermal Regulation 50 4.5 NO LOAD RL = 500Ω 4.0 3.5 3.0 2.5 2.0 RL = 50Ω 0 0 0 20 40 60 80 100 120 140 160 180 TIME (ms) 1120 G12 0 1 2 3 4 5 6 INPUT VOLTAGE (V) 7 8 1120 G13 1120fd 5 LT1120 U U U PI FU CTIO S GND (Pin 1): Ground. VIN (Pin 5): Input Supply. Bypass with a 10μF capacitor. Must always be more positive than ground. FB (Pin 2): Feedback. This is the feedback point of the regulator. When operating, it is nominally at 2.5V. Optimum source resistance is 200k to 500k. The feedback pin should not be driven below ground or more positive than 5V. REF (Pin 6): Reference. 2.5V can source or sink current. May be shorted to ground or up to 5V. Voltages in excess of 5V can damage the device. COMPOUT (Pin 7): Comparator Output. Open Collector NPN Output. May be connected to any voltage from ground to 36V more positive than ground (operates above VIN). Short-circuit protected. SHDN (Pin 3): Shutdown. A logic 1 shuts off the main regulator. Caution: noise or leakage into the shutdown pin can affect output voltage. – INPUT (Pin 8): Comparator Input. Inverting comparator input. VOUT (Pin 4): Regulator Output. Main output, requires a 10μF output capacitor. Can be shorted to VIN or ground without damaging the device. W BLOCK DIAGRA REF 6 VIN 5 50k + COMPOUT 7 – + – REF 2.5V 4 VOUT 2 FB 60k 3 SHDN 1 GND 1120 BD 8 –INPUT U W U U APPLICATIO S I FOR ATIO The LT1120 is especially suited for micropower system applications. For example, the comparator section of the LT1120 may be used as a battery checker to provide an indication of low battery. Another type of system application for the LT1120 would be to generate the equivalent of split supplies off of a single power input. The regulator section provides regulated output voltage and the reference, which can both source and sink current, is then an artificial system ground providing a split supply for the system. For many applications the comparator can be frequency compensated to operate as an amplifier. Compensation values for various gains are given in the data sheet. The comparator gain is purposely low to make it easier to frequency compensate as an amplifier. The NPN output is capable of sinking 10mA and can drive loads connected to voltages in excess of the positive power supply. This is useful for driving switches or linear regulators off of a higher input voltage. 1120fd 6 LT1120 U U W U APPLICATIO S I FOR ATIO Reference Overload Protection Internal to the LT1120 is a 2.5V trimmed class B output reference. The reference was designed to be able to source or sink current so it could be used in supply splitting applications as well as a general purpose reference for external circuitry. The design of the reference allows it to source typically 4mA or 5mA and sink 2mA. The available source and sink current decreases as temperature increases. It is sometimes desirable to decrease the AC output impedance by placing an output capacitor on them. The reference in the LT1120 becomes unstable with large capacitive loads placed directly on it. When using an output capacitor, about 20Ω should be used to isolate the capacitor from the reference pin. This 20Ω resistor can be placed directly in series with the capacitor or alternatively the reference line can have 20Ω placed in series with it and then a capacitor to ground. This is shown in Figure 1. Other than placing large capacitive loads on the reference, no other precautions are necessary and the reference is stable with nominal stray capacitances. The main regulator in the LT1120 is current limited at approximately 250mA. The current limit is stable with both input voltage and temperature. Like most other IC regulators, a minimum load is required on the output of the LT1120 to maintain regulation. For most standard regulators this is normally specified at 5mA. Of course, for a micropower regulator this would be a tremendously large current. The output must be large enough to absorb all the leakage current of the pass transistor at the maximum operating temperature. It also effects the transient response; low output currents have long recovery times from load transients. At high operating temperatures the minimum load current increases and having too low of a load current may cause the output to go unregulated. Devices are tested for minimum load current at high temperature. The output voltage setting resistors to the feedback terminal can usually be used to provide the minimum load current. Frequency Compensation REF 6 REF 6 OUTPUT 20Ω 20Ω + OR + 10μF OUTPUT 10μF 1120 F01 Figure 1. Bypassing Reference The LT1120 is frequency compensated by a dominant pole on the output. An output capacitor of 10μF is usually large enough to provide good stability. Increasing the output capacitor above 10μF further improves stability. In order to ensure stability, a feedback capacitor is needed between the output pin and the feedback pin. This is because stray capacitance can form another pole with the large value of feedback resistors used with the LT1120. Also, a feedback capacitor minimizes noise pickup and improves ripple rejection. With the large dynamic operating range of the output current, 10000:1, frequency response changes widely. Low AC impedance capacitors are needed to insure stability. While solid tantalum are best, aluminum electrolytics can be used but larger capacitor values may be needed. 1120fd 7 LT1120 U TYPICAL APPLICATIO S Regulator with Output Voltage Monitor 5 5V VIN LT1120 VOUT 4 VOUT 5V 500k LOGIC LOGIC OUTPUT 0.001μF – 7 98k VOUT –INPUT 8 + + FB REF 6 PIN 7 10μF 2k LOGIC OUTPUT 2 GND 100k 1 1120 TA03 LOGIC OUTPUT GOES LOW WHEN VOUT DROPS BY 100mV 1A Low Dropout Regulator Compensating the Comparator as an Op Amp VIN 6 8 50μA + 7 2.2k – AT Av = 100, SLEW RATE = +0.05V/μs –6V/μs 1M MJE2955 5 VIN VOUT 4 * 10k* LT1120 R2 R1 FB 100k 0.001μF + 2 220μF† GND C1 C2 VOUT 5V 1 150Ω* 100k 1120 TA04 Av 1 10 100 R1 33Ω 100Ω 10k C1 0.1μF 0.047μF 0.002μF C2 0.001μF — — R2 — 100k 10k 1120 TA05 * FOR CURRENT LIMIT ≈ 1.5A † MUST HAVE LOW ESR. SEVERAL 100μF CAPACITORS CAN BE PARALLELED. 1120fd 8 LT1120 U TYPICAL APPLICATIO S Regulator with Improved Transient Response 5V Regulator 5 VIN > 5.2V IQ = 40μA VIN VOUT 4 5V 0.001μF LT1120 + 10μF FB 5 VIN > 5.2V VIN 1M 4 5V 0.001μF LT1120 + 2 VOUT FB 25μF GND + 25μF 0.001μF GND 1M 1 1M 2 1 22k 1120 TA06 1M 1120 TA07 Battery-Backup Regulator VOUT 5V 5 BATTERY INPUT VIN VOUT 4 4 + 0.001μF LT1120 FB 1M 10μF VIN 5 MAIN POWER INPUT LT1120 2 2 GND VOUT FB GND 1 50k 1 1M INTERNAL PARASITIC DIODES OF LT1120 1120 TA08 VOUT VIN 5V Regulator with Feedback Shutdown VIN > 5.2V IQ = 40μA 5 VIN VOUT 4 + 0.001μF LT1120 FB 5V OUT 10μF 1M 2 GND 1 1M 2N3904* LOGIC INPUT NC * TRANSISTOR USED BECAUSE OF LOW LEAKAGE CHARACTERISTICS. TO TURN OFF THE OUTPUT OF THE LT1120 FORCE FB (PIN 2) > 2.5V. 1120 TA09 1120fd 9 R1 25Ω Q7 Q6 R36 60k Q8 Q9 R2 50k Q12 Q10 R37 110.8k R3 50k Q11 8 –INPUT Q17 Q18 Q15 Q16 Q14 R35 42k R6 3k Q21 Q19 R7 6.8k C1 10pF Q20 Q22 Q23 15k 281k C2 25pF R11 15k Q28 R14 15k Q32 Q27 Q31 R10 75k Q63 Q30 Q26 Q62 R38 20k Q61 Q60 Q24 Q25 R8 40k Q34 Q33 R15 80k Q35 R8 100k R16 6k C3 10pF Q38 R17 100Ω Q29 R19 40k R18 15k Q36 FB 2 Q41 Q39 Q59 Q37 Q40 R22 30k 125k 125k R34 60k 100pF SHDN 3 Q42 R23 30k R26 15k Q43 C5 100pF Q45 R24 390k Q47 R28 2k R27 15k Q46 Q44 Q51 C6 100pF R29 5Ω Q48 Q52 Q54 100pF Q49 R30 2k Q55 R33 47k 1120 Schem R32 2k R31 10Ω 1 Q56 GND 138.3k VOUT 4 Q58 5 VIN SCHE ATIC DIAGRA W W 10 Q5 COMPOUT 7 Q2 Q13 R4 42k REF 6 LT1120 1120fd LT1120 U PACKAGE DESCRIPTIO H Package 8-Lead TO-5 Metal Can (.230 Inch PCD) (Reference LTC DWG # 05-08-1321) .335 – .370 (8.509 – 9.398) DIA .305 – .335 (7.747 – 8.509) .027 – .045 (0.686 – 1.143) 45°TYP .040 (1.016) MAX .050 (1.270) MAX SEATING PLANE GAUGE PLANE .010 – .045* (0.254 – 1.143) PIN 1 .028 – .034 (0.711 – 0.864) .165 – .185 (4.191 – 4.699) .230 (5.842) TYP REFERENCE PLANE .500 – .750 (12.700 – 19.050) H8 (TO-5) 0.230 PCD 0801 .110 – .160 (2.794 – 4.064) INSULATING STANDOFF .016 – .021** (0.406 – 0.533) *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND THE SEATING PLANE .016 – .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 – 0.610) J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) .300 BSC (7.62 BSC) .008 – .018 (0.203 – 0.457) .200 (5.080) MAX CORNER LEADS OPTION (4 PLCS) .023 – .045 (0.584 – 1.143) HALF LEAD OPTION 0° – 15° .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .015 – .060 (0.381 – 1.524) .405 (10.287) MAX .005 (0.127) MIN 8 NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .014 – .026 (0.360 – 0.660) .100 (2.54) BSC 5 .025 (0.635) RAD TYP .220 – .310 (5.588 – 7.874) 1 .045 – .065 (1.143 – 1.651) 6 7 2 3 4 J8 0801 .125 3.175 MIN OBSOLETE PACKAGES N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .300 – .325 (7.620 – 8.255) .045 – .065 (1.143 – 1.651) ( +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE .130 ± .005 (3.302 ± 0.127) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ) 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .100 (2.54) BSC INCHES MILLIMETERS .400* (10.160) MAX .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) N8 1002 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) 1120fd 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. 11 LT1120 U TYPICAL APPLICATIO Current Limited 1A Regulator 0.5Ω* VIN 2.2k 2N3906* MJE2955 5 VIN VOUT 5V AT 1A VOUT 4 0.22μF LT1120 FB 100k + 2 220μF† GND 1 270Ω 100k 1120 TA10 * SETS CURRENT LIMIT BUT INCREASES DROPOUT VOLTAGE BY 0.5V † MUST HAVE LOW ESR. SEVERAL 100μF CAPACITORS CAN BE PARALLELED U PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 8 .053 – .069 (1.346 – 1.752) .014 – .019 (0.355 – 0.483) TYP NOTE: 1. DIMENSIONS IN 6 .045 ±.005 5 .050 BSC .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) 7 INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) .050 (1.270) BSC .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .245 MIN .160 ±.005 SO8 0303 1 2 3 4 .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1121 150mA Micropower Low Dropout Regulator 0.4V Dropout Voltage, Includes Shutdown, SOT-223, S8 Packages LT1521 300mA Mircopower Low Dropout Regulator Lowest IQ Low Dropout Regulator, SOT-223, S8, MS8 Packages LT1761 100mA Micropower Low Noise, Low Dropout Regulator SOT-23, 20μVRMS Noise, 20μA IQ, ThinSOT Package 1120fd 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LT 0907 REV D • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1989