LT1460-10 Micropower Precision Series Reference U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ High Accuracy: 0.075% Max Low Drift: 10ppm/°C Max Industrial Temperature Range SO-8 Package Low Supply Current: 270µA Max Minimum Output Current: 20mA No Output Capacitor Required Reverse Battery Protection Minimum Input/Output Differential: 0.9V Available in Small MSOP Package U APPLICATIONS ■ ■ ■ ■ ■ Handheld Instruments Precision Regulators A/D and D/A Converters Power Supplies Hard Disk Drives The LT ®1460-10 is a micropower bandgap reference that combines very high accuracy and low drift with low power dissipation and small package size. This series reference uses curvature compensation to obtain a low temperature coefficient and trimmed precision thin-film resistors to achieve high output accuracy. The reference will supply up to 20mA, making it ideal for precision regulator applications, yet it is almost totally immune to input voltage variations. This series reference provides supply current and power dissipation advantages over shunt references that must idle the entire load current to operate. Additionally, the LT1460-10 does not require an output capacitor, but it is stable with capacitive loads. This feature is important in critical applications where PC board space is a premium or fast settling is demanded. Reverse battery protection keeps the reference from conducting current and being damaged. The LT1460-10 is available in the 8-lead MSOP, SO, PDIP and the 3-lead TO-92 packages. It is also available in the SOT-23 package; see separate data sheet LT1460S3-10 (SOT-23). , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATION Typical Distribution of Output Voltage S8 Package 20 18 Basic Connection 16 14 IN C1 0.1µF OUT 10V GND 1460-10 TA01 UNITS (%) LT1460-10 10.9V TO 20V 1400 PARTS FROM 2 RUNS 12 10 8 6 4 2 0 – 0.10 – 0.06 – 0.02 0 0.02 0.06 OUTPUT VOLTAGE ERROR (%) 0.10 1460-10 TA02 1 LT1460-10 W W U W ABSOLUTE MAXIMUM RATINGS Input Voltage ........................................................... 30V Reverse Voltage .................................................... – 15V Output Short-Circuit Duration, TA = 25°C ............. 5 sec Specified Temperature Range Commercial ............................................ 0°C to 70°C Industrial ........................................... – 40°C to 85°C Storage Temperature Range (Note 1) ... – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C W U U PACKAGE/ORDER INFORMATION TOP VIEW TOP VIEW NC* VIN NC* GND 8 7 6 5 1 2 3 4 NC* NC* VOUT NC* MS8 PACKAGE 8-LEAD PLASTIC MSOP *CONNECTED INTERNALLY. DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS 8 NC* VIN 2 7 NC* NC* 3 6 VOUT GND 4 5 NC* N8 PACKAGE 8-LEAD PDIP *CONNECTED INTERNALLY. DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS S8 PACKAGE 8-LEAD PLASTIC SO ORDER PART NUMBER ORDER PART NUMBER LT1460ACN8-10 LT1460BIN8-10 LT1460DCN8-10 LT1460EIN8-10 MS8 PART MARKING 3 2 1 VIN VOUT GND Z PACKAGE 3-LEAD TO-92 PLASTIC TJMAX = 150°C, θJA = 160°C/ W TJMAX = 150°C, θJA = 130°C/ W (N8) TJMAX = 150°C, θJA = 190°C/ W (S8) TJMAX = 150°C, θJA = 250°C/ W LT1460CCMS8-10 LT1460FCMS8-10 BOTTOM VIEW NC* 1 ORDER PART NUMBER LT1460ACS8-10 LT1460BIS8-10 LT1460DCS8-10 LT1460EIS8-10 LT1460GCZ-10 LT1460GIZ-10 S8 PART MARKING LTAH LTAJ 1460A1 460BI1 1460D1 460EI1 Consult factory for Military grade parts. Available Options ACCURACY (%) TEMPERATURE COEFFICIENT (ppm/°C) N8 S8 0°C to 70°C 0.075 10 LT1460ACN8-10 LT1460ACS8-10 – 40°C to 85°C 0.10 10 LT1460BIN8-10 LT1460BIS8-10 0°C to 70°C 0.10 15 0°C to 70°C 0.10 20 LT1460DCN8-10 LT1460DCS8-10 – 40°C to 85°C 0.125 20 LT1460EIN8-10 LT1460EIS8-10 0°C to 70°C 0.15 25 0°C to 70°C 0.25 25 LT1460GCZ-10 – 40°C to 85°C 0.25 25 LT1460GIZ-10 TEMPERATURE 2 PACKAGE TYPE MS8 Z LT1460CCMS8-10 LT1460FCMS8-10 LT1460-10 ELECTRICAL CHARACTERISTICS VIN = 12.5V, IOUT = 0, TA = 25°C unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX Output Voltage (Note 2) LT1460ACN8, ACS8 9.9925 – 0.075 10.000 10.0075 0.075 V % LT1460BIN8, BIS8, CCMS8, DCN8, DCS8 9.990 – 0.10 10.000 10.010 0.10 V % LT1460EIN8, EIS8 9.9875 – 0.125 10.000 10.0125 0.125 V % LT1460FCMS8 9.985 – 0.15 10.000 10.015 0.15 V % LT1460GCZ, GIZ 9.975 – 0.25 10.000 10.025 0.25 V % 5 7 10 12 10 15 20 25 ppm/°C ppm/°C ppm/°C ppm/°C 30 60 80 ppm/V ppm/V 10 25 35 ppm/V ppm/V 1500 2800 3500 ppm/mA ppm/mA 80 135 180 ppm/mA ppm/mA 70 100 140 ppm/mA ppm/mA 0.5 2.5 ppm/mW Output Voltage Temperature Coefficient (Note 3) Line Regulation TMIN ≤ TJ ≤ TMAX LT1460ACN8, ACS8, BIN8, BIS8 LT1460CCMS8 LT1460DCN8, DCS8, EIN8, EIS8 LT1460FCMS8, GCZ, GIZ ● ● ● ● 10.9V ≤ VIN ≤ 12.5V ● 12.5V ≤ VIN ≤ 20V ● Load Regulation Sourcing (Note 4) IOUT = 100µA ● IOUT = 10mA ● IOUT = 20mA 0°C to 70°C Thermal Regulation (Note 5) Dropout Voltage (Note 6) ● ∆P = 200mW VIN – VOUT, ∆VOUT ≤ 0.1%, IOUT = 0 ● 0.9 V ● 1.3 1.4 V V VIN – VOUT, ∆VOUT ≤ 0.1%, IOUT = 10mA Output Current Short VOUT to GND Reverse Leakage VIN = – 15V 40 ● Supply Current 0.1Hz ≤ f ≤ 10Hz 10Hz ≤ f ≤ 1kHz Long-Term Stability of Output Voltage, S8 Pkg (Note 8) Hysteresis (Note 9) ∆T = – 40°C to 85°C ∆T = 0°C to 70°C The ● denotes specifications which apply over the specified temperature range. Note 1: If the part is stored outside of the specified temperature range, the output may shift due to hysteresis. Note 2: ESD (Electrostatic Discharge) sensitive device. Extensive use of ESD protection devices are used internal to the LT1460-10, however, high electrostatic discharge can damage or degrade the device. Use proper ESD handling precautions. mA 0.5 10 µA 190 270 360 µA µA ● Output Voltage Noise (Note 7) UNITS 40 35 µVP-P µVRMS 40 ppm/√kHr 160 25 ppm ppm Note 3: Temperature coefficient is measured by dividing the change in output voltage by the specified temperature range. Incremental slope is also measured at 25°C. Note 4: Load regulation is measured on a pulse basis from no load to the specified load current. Output changes due to die temperature change must be taken into account separately. Note 5: Thermal regulation is caused by die temperature gradients created by load current or input voltage changes. This effect must be added to normal line or load regulation. This parameter is not 100% tested. 3 LT1460-10 ELECTRICAL CHARACTERISTICS Note 6: Excludes load regulation errors. Note 7: Peak-to-peak noise is measured with a single highpass filter at 0.1Hz and a 2-pole lowpass filter at 10Hz. The unit is enclosed in a still-air environment to eliminate thermocouple effects on the leads. The test time is 10 sec. RMS noise is measured with a single highpass filter at 10Hz and a 2-pole lowpass filter at 1kHz. The resulting output is full wave rectified and then integrated for a fixed period, making the final reading an average as opposed to RMS. A correction factor of 1.1 is used to convert from average to RMS and a second correction of 0.88 is used to correct for the nonideal bandpass of the filters. Note 8: Long-term stability typically has a logarithmic characteristic and therefore, changes after 1000 hours tend to be much smaller than before that time. Total drift in the second thousand hours is normally less than one third that of the first thousand hours with a continuing trend toward reduced drift with time. Significant improvement in long-term drift can be realized by preconditioning the IC with a 100 hour to 200 hour, 125°C burn-in. Long-term stability will also be affected by differential stresses between the IC and the board material created during board assembly. See PC Board Layout in the Applications Information section. Note 9: Hysteresis in output voltage is created by package stress that differs depending on whether the IC was previously at a higher or lower temperature. Output voltage is always measured at 25°C, but the IC is cycled to 85°C or – 40°C before successive measurements. Hysteresis is roughly proportional to the square of the temperature change. Hysteresis is not normally a problem for operational temperature excursions where the instrument might be stored at high or low temperature. U W TYPICAL PERFORMANCE CHARACTERISTICS Minimum Input/Output Voltage Differential Load Regulation, Sourcing 10 125°C 1 – 55°C 25°C 100 9 90 8 7 6 125°C 5 0 0.5 1.0 1.5 2.0 INPUT/OUTPUT VOLTAGE (V) 3 2 – 55°C 0 0.1 2.5 80 70 25°C 60 – 55°C 50 125°C 40 30 20 10 0 1 10 OUTPUT CURRENT (mA) 100 1 0 3 4 2 OUTPUT CURRENT (mA) 1460-10 G02 1460-10 G01 Output Voltage Temperature Drift 10.006 25°C 4 1 0.1 Load Regulation, Sinking 10 OUTPUT VOLTAGE CHANGE (mV) OUTPUT VOLTAGE CHANGE (mV) OUTPUT CURRENT (mA) 100 1460-10 G03 Supply Current vs Input Voltage Line Regulation 10.004 400 3 TYPICAL PARTS 5 360 9.998 9.994 9.990 – 55°C 280 240 25°C 200 125°C 160 120 80 9.986 OUTPUT VOLTAGE (V) 10.000 320 SUPPLY CURRENT (µA) OUTPUT VOLTAGE (V) 10.002 25°C 9.996 – 55°C 9.992 125°C 9.988 9.984 40 9.982 – 50 –25 0 25 50 TEMPERATURE (°C) 75 100 1460-10 G04 4 0 9.980 0 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) 1460-10 G05 6 8 14 16 10 12 INPUT VOLTAGE (V) 18 20 1460-10 G06 LT1460-10 U W TYPICAL PERFORMANCE CHARACTERISTICS Power Supply Rejection Ratio vs Frequency 1000 10 CL = 0µF 80 70 60 50 40 30 20 100 CL = 0.1µF 10 CL = 1µF 1 0.1 0 1 IOUT = 10mA 10 0 0.1 LOAD CAPACITANCE (µF) 90 OUTPUT IMPEDANCE (Ω) POWER SUPPLY REJECTION RATIO (dB) Transient Responses Output Impedance vs Frequency 100 1 10 100 INPUT FREQUENCY (kHz) 1000 0.1 0.01 0.1 1 10 FREQUENCY (kHz) 100 1460-10 G07 200µs/DIV 1460-10 G09 1000 1460-10 G08 Output Voltage Noise Spectrum Output Noise 0.1Hz to 10Hz OUTPUT NOISE (50µV/DIV) NOISE VOLTAGE (µV/√Hz) 10 1 0.1 0.01 0.1 1 10 FREQUENCY (kHz) 100 0 2 4 1460-10 G10 6 8 10 TIME (SEC) 12 14 1460-10 G11 U W U U APPLICATIONS INFORMATION Precision Regulator Capacitive Loads The LT1460-10 is ideal as a precision regulator, and since it operates in series mode it does not require a current setting resistor. The reference can supply up to 20mA of load current with good transient response. Load regulation at 20mA output is typically 70ppm/mA meaning the output changes only 14mV. The LT1460-10 is designed to be stable with capacitive loads. With no capacitive load, the reference is ideal for fast settling or applications where PC board space is a premium. The test circuit shown in Figure 1 is used to measure the response time for various load currents and load capacitors. The 1V step from 10V to 9V produces a 5 LT1460-10 U U W U APPLICATIONS INFORMATION current step of 1mA or 100µA for RL = 1k or RL = 10k. Figure 2 shows the response of the reference with no load capacitance. The reference settles to 10mV (0.1%) in 0.4µs for a 100µA pulse and to 0.1% in 0.8µs with a 1mA step. When load capacitance is greater than 0.01µF, the reference begins to ring due to the pole formed with the output impedance. VIN = 12.5V LT1460-10 RL VOUT VGEN CIN 0.1µF 10V 9V CL 1460-10 F01 Figure 1. Response Time Test Circuit Figure 3 shows the response of the reference to a 1mA and 100µA load with a 0.01µF load capacitor. Fast Turn-On It is recommended to add a 0.1µF or larger input capacitor to the input pin of the LT1460-10. This helps stability with large load currents and speeds up turn-on. The LT1460-10 can start in 10µs, but it is important to limit the dv/dt of the input. Under light load conditions and with a very fast input, internal nodes overslew and this requires finite recovery time. Figure 4 shows the result of no bypass capacitance on the input and no output load. In this case the supply dv/dt is 12.5V in 30ns which causes internal overslew, and the output does not bias to 10V until 60µs. A 0.1µF input capacitor guarantees the part always starts quickly as shown in Figure 5. 10V VGEN 12.5V 9V VIN VOUT RL = 10k VOUT RL = 1k 0V VOUT 0V 2µs/DIV 20µs/DIV 1460-10 F02 Figure 2. CL = 0 1460-10 F04 Figure 4. CIN = 0 10V VGEN 12.5V 9V VOUT RL = 10k VOUT RL = 1k VIN 0V VOUT 0V 10µs/DIV Figure 3. CL = 0.01µF 6 1460-10 F03 20µs/DIV Figure 5. CIN = 0.1µF 1460-5 F04 LT1460-10 U U W U APPLICATIONS INFORMATION Output Accuracy Like all references, either series or shunt, the error budget of the LT1460-10 is made up of primarily three components: initial accuracy, temperature coefficient and load regulation. Line regulation is neglected because it typically contributes only 30ppm/V, or 300µV for a 1V input change. The LT1460-10 typically shifts less than 0.01% when soldered into a PCB, so this is also neglected (see PC Board Layout section). The output errors are calculated as follows for a 100µA load and 0°C to 70°C temperature range: LT1460AC Initial accuracy = 0.075% For IO = 100µA, 3500ppm ∆VOUT = 0.1mA 10V = 3.5mV mA ( )( ) which is 0.035%. For temperature 0°C to 70°C the maximum ∆T = 70°C, 10ppm ∆VOUT = 70°C 10 V = 7mV °C ( )( ) which is 0.07%. Total worst-case output error is: 0.075% + 0.035% + 0.070% = 0.180%. for instance) can shift the output voltage and mask the true temperature coefficient of a reference. In addition, the mechanical stress of being soldered into a PC board can cause the output voltage to shift from its ideal value. Surface mount voltage references (MS8 and S8) are the most susceptible to PC board stress because of the small amount of plastic used to hold the lead frame. A simple way to improve the stress-related shifts is to mount the reference near the short edge of the PC board, or in a corner. The board edge acts as a stress boundary, or a region where the flexure of the board is minimum. The package should always be mounted so that the leads absorb the stress and not the package. The package is generally aligned with the leads parallel to the long side of the PC board as shown in Figure 7a. A qualitative technique to evaluate the effect of stress on voltage references is to solder the part into a PC board and deform the board a fixed amount as shown in Figure 6. The flexure #1 represents no displacement, flexure #2 is concave movement, flexure #3 is relaxation to no displacement and finally, flexure #4 is a convex movement. This motion is repeated for a number of cycles and the relative output deviation is noted. The result shown in Figure 7a is for two LT1460S8-10s mounted vertically and Figure 7b is for two LT1460S8-10s mounted horizontally. The parts oriented in Figure 7a impart less stress into the package because stress is absorbed in the leads. Figures 7a and 7b show the deviation to be between 500µV and Table 1 gives worst-case accuracy for the LT1460AC, CC, DC, FC, GC from 0°C to 70°C and the LT1460BI, EI, GI from – 40°C to 85°C. 1 2 3 PC Board Layout 4 In 13- to 16-bit systems where initial accuracy and temperature coefficient calibrations have been done, the mechanical and thermal stress on a PC board (in a cardcage IOUT 1460-10 F06 Figure 6. Flexure Numbers LT1460AC LT1460BI LT1460CC LT1460DC LT1460EI LT1460FC LT1460GC LT1460GI 0 0.145% 0.225% 0.205% 0.240% 0.375% 0.325% 0.425% 0.562% 100µA 0.180% 0.260% 0.240% 0.275% 0.410% 0.360% 0.460% 0.597% 10mA 0.325% 0.405% 0.385% 0.420% 0.555% 0.505% 0.605% 0.742% 20mA 0.425% N/A 0.485% 0.520% N/A 0.605% 0.705% N/A 7 LT1460-10 U U W U APPLICATIONS INFORMATION 1mV and implies a 50ppm and 100ppm change respectively. This corresponds to a 13- to 14-bit system and is not a problem for most 10- to 12-bit systems unless the system has a calibration. In this case, as with temperature hysteresis, this low level can be important and even more careful techniques are required. The most effective technique to improve PC board stress is to cut slots in the board around the reference to serve as a strain relief. These slots can be cut on three sides of the reference and the leads can exit on the fourth side. This “tongue” of PC board material can be oriented in the long direction of the board to further reduce stress transferred to the reference. The results of slotting the PC boards of Figures 7a and 7b are shown in Figures 8a and 8b. In this example the slots can improve the output shift from about 100ppm to nearly zero. 8 OUTPUT DEVIATION (mV) OUTPUT DEVIATION (mV) 8 4 LONG DIMENSION 0 4 LONG DIMENSION 0 –4 –4 0 10 20 30 0 40 30 40 1460-10 F07b Figure 7b. Two Typical LT1460S8-10s, Horizontal Orientation Without Slots 8 8 OUTPUT DEVIATION (mV) OUTPUT DEVIATION (mV) 20 1460-10 F07a Figure 7a. Two Typical LT1460S8-10s, Vertical Orientation Without Slots 4 0 SLOT –4 4 0 SLOT –4 0 10 20 30 FLEXURE NUMBER Figure 8a. Same Two LT1460S8-10s in Figure 7a, but With Slots 8 10 FLEXURE NUMBER FLEXURE NUMBER 40 1460-10 F08a 0 10 20 30 FLEXURE NUMBER Figure 8b. Same Two LT1460S8-10s in Figure 7b, but With Slots 40 1460-10 F08b LT1460-10 W W SI PLIFIED SCHE ATIC VCC VOUT 360k 48k GND 1460-5 SS 9 LT1460-10 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP (LTC DWG # 05-08-1660) 0.040 ± 0.006 (1.02 ± 0.15) 0.007 (0.18) 0.118 ± 0.004* (3.00 ± 0.10) 0.006 ± 0.004 (0.15 ± 0.10) 8 7 6 5 0° – 6° TYP 0.021 ± 0.004 (0.53 ± 0.01) 0.118 ± 0.004** (3.00 ± 0.10) 0.192 ± 0.004 (4.88 ± 0.10) 0.012 (0.30) 0.025 (0.65) TYP 1 * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 4 2 3 MSOP08 0595 N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( +0.025 0.325 –0.015 +0.635 8.255 –0.381 ) 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 0.065 (1.651) TYP 0.005 (0.127) MIN 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.125 (3.175) MIN 0.018 ± 0.003 0.100 ± 0.010 (0.457 ± 0.076) (2.540 ± 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 10 0.400* (10.160) MAX 0.015 (0.380) MIN N8 0695 LT1460-10 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.053 – 0.069 (1.346 – 1.752) 7 8 0.004 – 0.010 (0.101 – 0.254) 6 5 0°– 8° TYP 0.016 – 0.050 0.406 – 1.270 0.050 (1.270) BSC 0.014 – 0.019 (0.355 – 0.483) *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) SO8 0695 1 2 3 4 Z Package 3-Lead Plastic TO-92 (Similar to TO-226) (LTC DWG # 05-08-1410) 0.060 ± 0.005 (1.524± 0.127) DIA 0.180 ± 0.005 (4.572 ± 0.127) 0.500 (12.70) MIN 0.050 ± 0.005 (1.270 ± 0.127) 0.180 ± 0.005 (4.572 ± 0.127) 0.060 ± 0.010 (1.524 ± 0.254) 0.90 (2.286) NOM 0.050 UNCONTROLLED (1.270) LEAD DIMENSION MAX 0.016 ± 0.003 (0.406 ± 0.076) 0.140 ± 0.010 (3.556 ± 0.127) 5° NOM 10° NOM 0.015 ± 0.002 (0.381 ± 0.051) 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. Z3 (TO-92) 0695 11 LT1460-10 U TYPICAL APPLICATIONS Boosted Output Current with No Current Limit V + ≥ (VOUT + 1.8V) Boosted Output Current with Current Limit V+ ≥ VOUT + 2.8V + R1 220Ω D1* LED 47µF + R1 220Ω 8.2Ω 2N2905 2N2905 IN IN 10V 100mA LT1460-10 OUT GND 47µF + 10V 100mA LT1460-10 OUT 2µF SOLID TANT + GND *GLOWS IN CURRENT LIMIT, DO NOT OMIT 1460-10 TA03 2µF SOLID TANT 1460-10 TA04 Handling Higher Load Currents 12.5V 40mA + 47µF IN 10mA R1* 63Ω VOUT 10V LT1460-10 OUT GND RL TYPICAL LOAD CURRENT = 50mA *SELECT R1 TO DELIVER 80% OF TYPICAL LOAD CURRENT. LT1460 WILL THEN SOURCE AS NECESSARY TO MAINTAIN PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS DEGRADED IN THIS APPLICATION 1460-10 TA05 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1019 Precision Bandgap Reference 0.05% Max, 5ppm/°C Max LT1236 Precision Low Noise Reference 0.05% Max, 5ppm/°C Max, SO Package LT1634 Micropower Precision Shunt Reference 0.05%, Max, 25ppm/°C Max 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900 FAX: (408) 434-0507● TELEX: 499-3977 ● www.linear-tech.com 146010f LT/TP 1097 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1997