LT1019 Precision Reference U FEATURES DESCRIPTIO ■ The LT ®1019 is a third generation bandgap voltage reference utilizing thin film technology and a greatly improved curvature correction technique. Wafer level trimming of both reference and output voltage combines to produce very low TC and tight initial output voltage tolerance. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Tight Initial Output Voltage: < 0.05% Ultralow Drift: 3ppm/°C Typical Series or Shunt Operation Curvature Corrected Ultrahigh Line Rejection: ≈ 0.5ppm/V Low Output Impedance: ≈ 0.02Ω Plug-In Replacement for Present References Available at 2.5V, 4.5V, 5V, and 10V 100% Noise Tested Temperature Output Industrial Temperature Range in SO-8 Available in 8-Lead N8 and S8 Packages The LT1019 can both sink and source up to 10mA and can be used in either the series or shunt mode, allowing the reference to operate with positive or negative output voltages without external components. Minimum input/ output voltage is less than 1V in the series mode, providing improved tolerance of low line conditions and excellent line regulation. U APPLICATIO S ■ ■ ■ ■ ■ ■ The LT1019 is available in four voltages: 2.5V, 4.5V, 5V and 10V. It is a direct replacement for most bandgap references presently available including AD580, AD581, REF-01, REF-02, MC1400, MC1404 and LM168. Negative Shunt References A/D and D/A Converters Precision Regulators Constant Current Sources V/F Converters Bridge Excitation , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATION Output Voltage Drift Ultralinear Strain Gauge 357Ω* 0.5W IN 5V 1.003 R3 2M OUT 350Ω BRIDGE LT1019-5 R2 20k GND + A1† LT1637 R4 20k – ACTIVE ELEMENT –5V 357Ω* 0.5W –15V – A2 GAIN = 100 +LT1001 R5 2M R6** 2M LT1019 • TA01 *REDUCES REFERENCE AND AMPLIFIER LOADING TO ≈0. **IF R6 = R3, BRIDGE IS NOT LOADED BY R2 AND R4. † A1 VOS AND DRIFT ARE NOT CRITICAL BECAUSE A2 ACTS AS A DIFFERENTIAL AMPLIFIER. OUTPUT VOLTAGE (NORMALIZED) (V) 15V 1.002 10ppm/°C FULL TEMP RANGE “BOX” 1.001 LT1019 CURVE 1.000 0.999 0.998 0.997 –50 –25 5ppm/°C 0°C TO 70°C “BOX” UNCOMPENSATED “STANDARD” BANDGAP DRIFT CURVE 50 25 75 0 TEMPERATURE (˚C) 100 125 1019 TA02 1019fd 1 LT1019 W W W AXI U U ABSOLUTE RATI GS (Note 1) Specified Temperature Range Commercial ............................................. 0°C to 70°C Industrial ............................................ – 40°C to 85°C Military ............................................. – 55°C to 125°C Trim Pin Voltage ................................................... ±30V Temp Pin Voltage ..................................................... 5V Storage Temperature Range (Note 11) – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C Input Voltage .......................................................... 40V Output Voltage (Note 2) LT1019-5, LT1019-10 ........................................ 16V LT1019-2.5, LT1019-4.5 ...................................... 7V Output Short-Circuit Duration (Note 2) VIN < 20V .................................................... Indefinite 20V ≤ VIN ≤ 35V ............................................. 10 sec U W U PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW DNC* 8 DNC* 1 7 6 OUTPUT INPUT 2 TEMP DNC* 5 3 TRIM TOP VIEW DNC* 1 8 DNC* DNC* 1 8 DNC* INPUT 2 7 DNC* INPUT 2 7 DNC* TEMP 3 6 OUTPUT TEMP 3 6 OUTPUT GND 4 5 TRIM GND 4 5 TRIM 4 GND (CASE) H PACKAGE 8-LEAD TO-5 METAL CAN *INTERNALLY CONNECTED. DO NOT CONNECT EXTERNALLY TJMAX = 150°C, θJA = 150°C/ W, θJC = 45°C/W ORDER PART NUMBER LT1019ACH-2.5 LT1019ACH-4.5 LT1019ACH-5 LT1019ACH-10 LT1019AMH-2.5 LT1019AMH-4.5 LT1019AMH-5 LT1019AMH-10 LT1019CH-2.5 LT1019CH-4.5 LT1019CH-5 LT1019CH-10 LT1019MH-2.5 LT1019MH-4.5 LT1019MH-5 LT1019MH-10 OBSOLETE N8 PACKAGE 8-LEAD PDIP *INTERNALLY CONNECTED. DO NOT CONNECT EXTERNALLY. TJMAX = 100°C, θJA = 130°C/ W ORDER PART NUMBER LT1019ACN8-2.5 LT1019ACN8-4.5 LT1019ACN8-5 LT1019ACN8-10 LT1019CN8-2.5 LT1019CN8-4.5 LT1019CN8-5 LT1019CN8-10 LT1019IN8-2.5 LT1019IN8-4.5 LT1019IN8-5 LT1019IN8-10 S8 PACKAGE 8-LEAD PLASTIC SO *INTERNALLY CONNECTED. DO NOT CONNECT EXTERNALLY. TJMAX = 100°C, θJA = 130°C/ W ORDER PART NUMBER S8 PART MARKING LT1019ACS8-2.5 LT1019ACS8-5 LT1019AIS8-2.5 LT1019AIS8-5 LT1019CS8-2.5 LT1019CS8-4.5 LT1019CS8-5 LT1019CS8-10 LT1019IS8-2.5 LT1019IS8-5 019A25 1019A5 19AI25 019AI5 1925 1945 1905 1910 19I25 19I05 CONSIDER THE N8 OR S8 FOR ALTERNATE SOURCES. 1019fd 2 LT1019 U AVAILABLE OPTIO S OUTPUT VOLTAGE (V) TEMPERATURE (°C) ACCURACY (%) TEMPERATURE COEFFICIENT (ppm/°C) TO-5 H8 PACKAGE TYPE SO-8 S8 PDIP-8 N8 2.5 0 to 70 0.05 0.2 5 20 LT1019ACH-2.5 LT1019CH-2.5 LT1019ACS8-2.5 LT1019CS8-2.5 LT1019ACN8-2.5 LT1019CN8-2.5 – 40 to 85 0.05 0.2 10 20 LT1019AIS8-2.5 LT1019IS8-2.5 LT1019IN8-2.5 – 55 to 125 0.05 0.2 10 25 LT1019AMH-2.5 LT1019MH-2.5 0 to 70 0.05 0.2 5 20 LT1019ACH-4.5 LT1019CH-4.5 LT1019CS8-4.5 LT1019ACN8-4.5 LT1019CN8-4.5 – 40 to 85 0.2 20 – 55 to 125 0.05 0.2 10 25 LT1019AMH-4.5 LT1019MH-4.5 0 to 70 0.05 0.2 5 20 LT1019ACH-5 LT1019CH-5 – 40 to 85 0.05 0.2 10 20 – 55 to 125 0.05 0.2 10 25 LT1019AMH-5 LT1019MH-5 0 to 70 0.05 0.2 5 20 LT1019ACH-10 LT1019CH-10 – 40 to 85 0.2 20 – 55 to 125 0.05 0.2 10 25 4.5 5 10 LT1019IN8-4.5 LT1019ACS8-5 LT1019CS8-5 LT1019ACN8-5 LT1019CN8-5 LT1019AIS8-5 LT1019IS8-5 LT1019IN8-5 LT1019CS8-10 LT1019ACN8-10 LT1019CN8-10 LT1019IN8-10 LT1019AMH-10 LT1019MH-10 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN = 15V, IOUT = 0 unless otherwise noted. SYMBOL PARAMETER CONDITIONS TC Output Voltage Temperature Coefficient (Note 3) LT1019C (0°C to 70°C) LT1019I (– 40°C to 85°C) LT1019M (– 55°C to 125°C) ∆VOUT ∆VIN Line Regulation (Note 4) (VOUT + 1.5V) ≤ VIN ≤ 40V RR Ripple Rejection MIN Output Voltage Tolerance LT1019A TYP MAX MIN LT1019 TYP MAX UNITS 0.02 0.05 0.02 0.2 % ● ● ● 3 3 5 5 10 10 5 5 8 20 20 25 ppm/°C ppm/°C ppm/°C ● 0.5 1.0 3 5 0.5 1.0 3 5 ppm/V ppm/V 50Hz ≤ f ≤ 400Hz ● 90 84 110 90 84 110 dB dB 1019fd 3 LT1019 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN = 15V, IOUT = 0 unless otherwise noted. SYMBOL PARAMETER CONDITIONS ∆VOUT ∆IOUT Load Regulation Series Mode (Notes 4, 5) 0 ≤ IOUT ≤ 10mA (Note 5) Load Regulation, Shunt Mode 1mA ≤ ISHUNT ≤ 10mA (Notes 5, 6) 2.5V, 4.5V, 5V 10V Thermal Regulation (Note 7) ∆P = 200mW, t = 50ms IQ ISC en MIN LTC1019A TYP MAX Quiescent Current Series Mode LTC1019 TYP MAX UNITS 0.02 0.05 0.08 0.02 0.05 0.08 mV/mA (Ω) mV/mA (Ω) 0.1 0.4 0.8 0.1 0.4 0.8 mV/mA (Ω) mV/mA (Ω) 0.1 0.5 0.1 0.5 ppm/mW 0.65 1.0 1.3 0.65 1.2 1.5 mA mA ● ● ● MIN ● Minimum Shunt Current (Note 8) ● 0.5 0.8 0.5 0.8 mA Minimum Input/Output Voltage Differential IOUT ≤ 1mA IOUT = 10mA ● ● 0.9 1.1 1.3 0.9 1.1 1.3 V V Trim Range LT1019-2.5 LT1019-5 LT1019-10 Short-Circuit Current Output Connected to GND 2V ≤ VIN ≤ 35V Output Voltage Noise (Note 10) 10Hz ≤ f ≤ 1kHz 0.1Hz ≤ f ≤ 10Hz ±3.5 ±6 ±3.5 5, – 13 ±3.5 5, – 27 ● Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: These are high power conditions and are therefore guaranteed only at temperatures equal to or below 70°C. Input is either floating, tied to output or held higher than output. Note 3: Output voltage drift is measured using the box method. Output voltage is recorded at TMIN, 25°C and TMAX. The lowest of these three readings is subtracted from the highest and the resultant difference is divided by (TMAX – TMIN). Note 4: Line regulation and load regulation are measured on a pulse basis with low duty cycle. Effects due to die heating must be taken into account separately. See thermal regulation and application section. Note 5: Load regulation is measured at a point 1/8" below the base of the package with Kelvin contacts. Note 6: Shunt regulation is measured with the input floating. This parameter is also guaranteed with the input connected (VIN – VOUT) > 1V, 0mA ≤ ISINK ≤ 10mA. Shunt and sink current flow into the output. 15 10 25 50 2.5 2.5 4 % % % ±3.5 ±3.5 ±3.5 ±6 5, – 13 5, – 27 15 10 25 50 mA mA 2.5 2.5 4 ppm (RMS) ppm (P-P) Note 7: 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. Note 8: Minimum shunt current is measured with shunt voltage held 20mV below the value measured at 1mA shunt current. Note 9: Minimum input/output voltage is measured by holding input voltage 0.5V above the nominal output voltage, while measuring VIN – VOUT. Note 10: RMS noise is measured with a single pole 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 the nonideal bandpass of the filters. Note 11: If the part is stored outside of the specified temperature range, the output may shift due to hysteresis. 1019fd 4 LT1019 U W TYPICAL PERFOR A CE CHARACTERISTICS Quiescent Current (LT1019-4.5/LT1019-5) Quiescent Current (LT1019-10) 1.6 1.6 1.6 1.4 1.4 1.4 1.2 1.2 125°C 0.8 25°C –55°C 0.6 1.2 CURRENT (mA) 1.0 CURRENT (mA) CURRENT (mA) Quiescent Current (LT1019-2.5) 125°C 1.0 25°C 0.8 –55°C 0.6 0.4 0.2 0.2 0.2 0 5 10 15 20 25 30 35 INPUT VOLTAGE (V) 40 45 0 5 10 15 20 25 30 35 INPUT VOLTAGE (V) 40 Minimum Input/Output Voltage Differential INPUT VOLTAGE/OUTPUT VOLTAGE (dB) TJ = 25°C OUTPUT CHANGE (mV) TJ = –55°C TJ = 25°C 2.5 LT1019-10 1.0 LT1019-4.5/LT1019-5 0.5 LT1019-2.5 0 –0.5 –1.0 –1.5 0 0 –2.0 –10 –8 –6 –4 –2 0 2 4 6 8 SINKING SOURCING OUTPUT CURENT (mA) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 INPUT/OUTPUT VOLTAGE (V) LT1019 • TPC04 1.0 100 70 60 50 10 0 0.6 0.5 0.4 0.3 4.0 LT1019 • TPC07 0.4 TJ = 125°C TJ = 25°C TJ = –55°C 0.1 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 OUTPUT-TO-GROUND VOLTAGE (V) 0.5 0.2 TJ = 25°C TJ = –55°C 0.1 0.6 0.3 TJ = 125°C 0.2 TJ = –55°C 0 CURRENT (mA) CURRENT (mA) 0.7 TJ = 25°C 1M INPUT OPEN 0.9 0.8 0.1 100k 1.0 0.7 TJ = 125°C 1k 10k FREQUENCY (Hz) Shunt Mode Characteristics (LT1019-10) 0.8 0.4 100 LT1019 • TPC06 INPUT OPEN 0.9 0.5 LT1019-4.5 LT1019-5 80 0.7 0.2 LT1019-2.5 90 0.8 0.3 LT1019-10 40 10 1.0 INPUT OPEN 45 40 TJ = 25°C 110 Shunt Mode Characteristics (LT1019-5) 0.6 15 20 25 30 35 INPUT VOLTAGE (V) LT1019 • TPC05 Shunt Mode Characteristics (LT1019-2.5) 0.9 10 Ripple Rejection 1.5 TJ = 125°C 5 120 2.0 5.0 0 LT1019 • TPC03 Load Regulation 10 7.5 –55°C LT1019 • TPC02 LT1019 • TPC01 OUTPUT CURRENT (mA) 0 45 25°C 0.6 0.4 0 125°C 0.8 0.4 0 CURRENT (mA) 1.0 0 0 7 6 4 1 3 2 5 OUTPUT-TO-GROUND VOLTAGE (V) 8 LT1019 • TPC08 0 8 2 6 4 10 12 14 OUTPUT-TO-GROUND VOLTAGE (V) 16 LT1019 • TPC09 1019fd 5 LT1019 U W TYPICAL PERFOR A CE CHARACTERISTICS Temp Pin Voltage 140 120 0.75 0.70 0.65 0.60 0.55 0.50 10 IOUT TJ = 25°C 100 OUTPUT CAPACITOR (µF) OUTPUT VOLTAGE CHANGE (µV) 0.90 0.85 0.80 VOLTAGE (V) LT1019-2.5* Stability with Output Capacitance Line Regulation 80 60 LT1019-10 40 20 LT1019-2.5 LT1019-5 0 –10 1 REGION OF POSSIBLE INSTABILITY 0.1 0.01 0.001 –20 0.45 0.40 50 25 0 75 100 –50 –25 JUNCTION TEMPERATURE (°C) –30 0 125 5 10 15 20 25 30 INPUT VOLTAGE (V) 35 40 0.0001 20 LT1019 • TPC11 LT1019 • TPC10 0 10 15 20 15 10 5 5 SINK CURRENT SOURCE CURRENT OUTPUT CURRENT (mA) 1019 G12 *LT1019-4.5/LT1019-5/LT1019-10 ARE STABLE WITH ALL LOAD CAPACITANCE. W BLOCK DIAGRA R1 LT1019-2.5 = 11k LT1019-4.5 = 13.9k LT1019-5 = 16k LT1019-10 = 37.1k VIN R3 80k – TRIM R2 LT1019-4.5, LT1019-5, LT1019-10 = 5k LT1019-2.5 = 10k 1.188V VOUT + GND LT1019 • BD U U W U APPLICATIO S I FOR ATIO Line and Load Regulation Line regulation on the LT1019 is nearly perfect. A 10V change in input voltage causes a typical output shift of less than 5ppm. Load regulation (sourcing current) is nearly as good. A 5mA change in load current shifts output voltage by only 100µV. These are electrical effects, measured with low duty cycle pulses to eliminate heating effects. In real world applications, the thermal effects of load and line changes must be considered. Two separate thermal effects are evident in monolithic circuits. One is a gradient effect, where power dissipation on the die creates temperature gradients. These gradients can cause output voltage shifts even if the overall temperature coefficient of the reference is zero. The LT1019, unlike previous references, specifies thermal regulation caused by die temperature gradients.The specification is 0.5ppm/mW. To calculate the effect on output voltage, simply multiply the change in device power dissipation by 1019fd 6 LT1019 U U W U APPLICATIO S I FOR ATIO the thermal regulation specification. Example: a 10V device with a nominal input voltage of 15V and load current of 5mA. Find the effect of an input voltage change of 1V and a load current change of 2mA. ∆P (line change) = (∆VIN)(ILOAD) = (1V)(5mA) = 5mW ∆VOUT = (0.5ppm/mW)(5mW) = 2.5ppm ∆P (load change) = (∆ILOAD)(VIN – VOUT) = (2mA)(5V) = 10mW ∆VOUT = (0.5ppm/mW)(10mW) = 5ppm Even though these effects are small, they should be taken into account in critical applications, especially where input voltage or load current is high. The second thermal effect is overall die temperature change. The magnitude of this change is the product of change in power dissipation times the thermal resistance (θJA) of the IC package ≅ (100°C/W to 150°C/W). The effect on the reference output is calculated by multiplying die temperature change by the temperature drift specification of the reference. Example: same conditions as above with θJA = 150°C/W and an LT1019 with 20ppm/°C drift specification. ∆P (line change) = 5mW ∆VOUT = (5mW)(150°C/W)(20ppm/°C) = 15ppm ∆P (load change) = 10mW ∆VOUT = (10mW)(150°C/W)(20ppm/°C) = 30ppm These calculations show that thermally induced output voltage variations can easily exceed the electrical effects. In critical applications where shifts in power dissipation are expected, a small clip-on heat sink can significantly improve these effects by reducing overall die temperature change. Alternately, an LT1019A can be used with four times lower TC. If warm-up drift is of concern, these measures will also help. With warm-up drift, total device power dissipation must be considered. In the example given, warm-up drift (worst case) is equal to: Warm-up drift = [(VIN)(IQ) + (VIN – VOUT)(ILOAD)] [(θJA)(TC)] with IQ (quiescent current) = 0.6mA, Warm-up drift = [(15V)(0.6mA) + (5V)(5mA)] [(150°C/W)(25ppm/°C)] = 127.5ppm Note that 74% of the warm-up drift is due to load current times input/output differential. This emphasizes the importance of keeping both these numbers low in critical applications. Note that line regulation is now affected by reference output impedance. R1 should have a wattage rating high enough to withstand full input voltage if output shorts must be tolerated. Even with load currents below 10mA, R1 can be used to reduce power dissipation in the LT1019 for lower warm-up drift, etc. Output Trimming Output voltage trimming on the LT1019 is nominally accomplished with a potentiometer connected from output to ground with the wiper tied to the trim pin. The LT1019 was made compatible with existing references, so the trim range is large: + 6%, – 6% for the LT1019-2.5, + 5%, – 13% for the LT1019-5, and + 5%, – 27% for the LT1019-10. This large trim range makes precision trimming rather difficult. One solution is to insert resistors in series with both ends of the potentiometer. This has the disadvantage of potentially poor tracking between the fixed resistors and the potentiometer. A second method of reducing trim range is to insert a resistor in series with the wiper of the potentiometer. This works well only for very small trim range because of the mismatch in TCs between the series resistor and the internal thin film resistors. These film resistors can have a TC as high as 500ppm/°C. That same TC is then transferred to the change in output voltage: a 1% shift in output voltage causes a (500ppm)(1%) = 5ppm/°C change in output voltage drift. 1019fd 7 LT1019 U U W U APPLICATIO S I FOR ATIO The worst-case error in initial output voltage for the LT1019 is 0.2%, so a series resistor is satisfactory if the output is simply trimmed to nominal value. The maximum TC shift expected would be 1ppm/°C. Using the Temp Pin The LT1019 has a TEMP pin like several other bandgap references. The voltage on this pin is directly proportional to absolute temperature (PTAT) with a slope of approximately 2.1mV/°C. Room temperature voltage is therefore approximately (295°K)(2.1mV/°C) = 620mV. This voltage varies with process parameters and should not be used to measure absolute temperature, but rather relative temperature changes. Previous bandgap references have been very sensitive to any loading on the TEMP pin because it is an integral part of the reference “core” itself. The LT1019 “taps” the core at a special point which has much less effect on the reference. The relationship between TEMP pin loading and a change in reference output voltage is less than 0.05%/µA, about ten times improvement over previous references. Output Bypassing The LT1019 is designed to be stable with a wide range of load currents and output capacitors. The 4.5V, 5V, and 10V devices do not oscillate under any combination of capacitance and load. The 2.5V device can oscillate when sinking currents between 1mA and 6mA for load capacitance between 400pF and 2µF (see Figure 1). If output bypassing is desired to reduce high frequency output impedance, keep in mind that loop phase margin is significantly reduced for output capacitors between 500pF and 1µF if the capacitor has low ESR (Effective Series Resistance). This can make the output “ring” with tranVIN VIN LT1019 LT1019 2Ω TO 5Ω + 2Ω TO 5Ω + 2µF TANTALUM (a) (b) 2µF TO 10µF TANTALUM 1019 F01 Figure 1. Output Bypassing sient loads. The best transient load response is obtained by deliberately adding a resistor to increase ESR as shown in Figure 1. Use configuration (a) if DC voltage error cannot be compromised as load current changes. Use (b) if absolute minimum peak perturbation at the load is needed. For best transient response, the output can be loaded with ≥ 1mA DC current. U TYPICAL APPLICATIO S Narrow Trim Range (±0.2%) Wide Range Trim ≥ ±5% OUT VIN VOUT IN LT1019 TRIM GND R1 25k VOUT OUT VIN IN LT1019 TRIM GND R2* 1.5M R1 100k 1019 TA03 *INCREASE TO 4.7M FOR LT1019A (±0.05%) 1019 TA05 1019fd 8 LT1019 U TYPICAL APPLICATIO S Trimming LT1019-10 Output to 10.240V Trimming LT1019-5 Output to 5.120V VOUT VOUT VIN OUT IN LT1019-5 TRIM GND 41.2k 1% OUT IN LT1019-10 TRIM GND VIN 5k* ±1% TRIM 90.9k 1% 5k* ±1% TRIM 4.02k 1% 4.02k 1% *LOW TC CERMET *LOW TC CERMET Negative Series Reference Precision 1µA Current Source 15V 11.5k 1% 5k* 8.25k 1% 2.49M 1% OUT 1019 TA06 1019 TA04 V+ IN LT1019 R1* LT1019-2.5 TRIM GND IN D1* OUT GND R2* – + –VIN VOUT ±11V COMPLIANCE LT1012 Q1 2N2905 –VREF AT 50mA + V – – VREF *R1 = V – 5V , R2 = , D1 = VREF + 5V 1mA 2mA 1019 TA10 IOUT = 1µA ZOUT ≥ 1011Ω *LOW TC CERMET, TRIM RANGE = ±1.5% 1019 TA07 Output Current Boost with Current Limit V + ≥ (VOUT + 2.8V) LED GLOWS IN CURRENT LIMIT (DO NOT OMIT) R1 220Ω 8.2Ω 2N2905 IN LT1019 OUT GND ILOAD ≤ 100mA 2µF SOLID TANTALUM 1019 TA08 1019fd 9 10 R29 TRIM 80k R3 R2 R1 Q1 R14 72k Q3 5k R8 2.5k R7 1.6k R6 780Ω R4 SHORT FOR 2.5 R9 3k Q2 R5 Q4 R25 1k R37 2k R38 3.75k Q38 Q36 R36 82k Q37 R11B 1k Q7 R11A 1.9k R39 Q5 R42 4k Q6A R26 3k R12 7.2k Q8 Q9 R28 9k 1k R13 24.5k Q10 R15 3k R18 2k Q14 Q6B Q18 R27 9k C4 Q11 Q16 R34 4k Q32 Q12 Q17 Q15 Q20 C3 R16 Q35 3k R17 500Ω Q19 Q30 R24 850Ω R35 27k Q31 Q29 Q13 Q21 Q33 Q25 Q22 Q23 Q34 R20 750Ω Q28 R23 100Ω R31 22k R33 1k R32 500Ω Q27 VOUT GND Q24 R19 15Ω Q26 R21 20Ω VIN LT1019 W W SCHE ATIC DIAGRA 1019fd LT1019 U PACKAGE DESCRIPTIO H Package 8-Lead TO-5 Metal Can (0.200 PCD) (LTC DWG # 05-08-1320) 0.335 – 0.370 (8.509 – 9.398) DIA 0.305 – 0.335 (7.747 – 8.509) 0.027 – 0.045 (0.686 – 1.143) 45°TYP PIN 1 0.028 – 0.034 (0.711 – 0.864) 0.040 (1.016) MAX 0.050 (1.270) MAX SEATING PLANE 0.200 (5.080) TYP 0.165 – 0.185 (4.191 – 4.699) GAUGE PLANE 0.010 – 0.045* (0.254 – 1.143) REFERENCE PLANE 0.500 – 0.750 (12.700 – 19.050) 0.110 – 0.160 (2.794 – 4.064) INSULATING STANDOFF 0.016 – 0.021** (0.406 – 0.533) *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND 0.045" BELOW THE REFERENCE PLANE 0.016 – 0.024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 – 0.610) OBSOLETE H8(TO-5) 0.200 PCD 1197 N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.300 – 0.325 (7.620 – 8.255) 0.065 (1.651) TYP +0.035 0.325 –0.015 ( +0.889 8.255 –0.381 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) 0.009 – 0.015 (0.229 – 0.381) 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 0.100 (2.54) BSC ) 0.400* (10.160) MAX (0.457 ± 0.076) N8 1098 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) .245 MIN .053 – .069 (1.346 – 1.752) 0°– 8° TYP 8 7 6 5 .004 – .010 (0.101 – 0.254) .160 ±.005 .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT .014 – .019 (0.355 – 0.483) TYP 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) 1 2 3 4 SO8 0303 1019fd 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 LT1019 U TYPICAL APPLICATION Negative 10V Reference for CMOS DAC OUT 59k 1% LT1019-10 TRIM GND 5k* FB 30pF 5.76k 1% LTC1595 IOUT REF – + 1.2k LT1007 VOUT *LOW TC CERMET, TRIM RANGE = ±1.5% –15V 1019 TA09 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1027 Precision 5V Reference Lowest TC, High Accuracy, Low Noise, Zener Based LT1236 Precision Reference 5V and 10V Zener Based, 5ppm/°C, SO-8 Package LT1460 Micropower Precision Series Reference Bandgap, 130µA Supply Current, 10ppm/°C, Available in SOT-23 Package LT1634 Micropower Precision Shunt Reference Bandgap 0.05%, 10ppm/°C, 10µA Supply Current LTC1798 Micropower Low Dropout Reference 0.15% Max, 6.5µA Supply Current LT1461 Micropower Low Dropout Reference 3ppm/°C, 0.04%, 50µA Supply Current 1019fd 12 Linear Technology Corporation LT/TP 0205 1K REV D • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 1993