LT1009 2.5-V INTEGRATED REFERENCE CIRCUIT SLVS013H – MAY 1987 – REVISED MARCH 2002 D D D D D D D D OR PW PACKAGE (TOP VIEW) Excellent Temperature Stability Initial Tolerance . . . 0.2% Max Dynamic Impedance . . . 0.6 Ω Max Wide Operating Current Range Directly Interchangeable With LM136 Needs No Adjustment for Minimum Temperature Coefficient Surface-Mount Three-Lead Package NC NC NC ANODE 1 8 2 7 3 6 4 5 CATHODE NC CATHODE ADJ NC–No internal connection LP PACKAGE (TOP VIEW) description The LT1009 reference circuit is a precision-trimmed 2.5-V shunt regulator featuring low dynamic impedance and a wide operating current range. The maximum initial tolerance is ±5 mV in the LP package and ±10 mV in the D package. The reference tolerance is achieved by on-chip trimming, which minimizes the initial voltage tolerance and the temperature coefficient αvz. ANODE CATHODE ADJ Although the LT1009 needs no adjustments, a third terminal (ADJ) allows the reference voltage to be adjusted ±5% to eliminate system errors. In many applications, the LT1009 can be used as a terminal-for-terminal replacement for the LM136-2.5, which eliminates the external trim network. The LT1009 uses include 5-V system references, 8-bit analog-to-digital converter (ADC) and digital-to-analog converter (DAC) references, and power-supply monitors. The device also can be used in applications such as digital voltmeters and current-loop measurement and control systems. The LT1009C is characterized for operation from 0°C to 70°C. The LT1009I is characterized for operation from –40°C to 85°C. AVAILABLE OPTIONS PACKAGE TA SMALL OUTLINE (D) PLASTIC CYLINDRICAL (LP) PLASTIC THIN SHRINK SMALL OUTLINE (PW) 0°C to 70°C LT1009CD LT1009CLP LT1009CPW –40°C to 85°C LT1009ID LT1009ILP — The D and LP packages are available taped and reeled. Add the suffix R to device type (e.g., LT1009CDR). The PW package is only available taped and reeled. symbol ANODE CATHODE ADJ Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright 2002, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 LT1009 2.5-V INTEGRATED REFERENCE CIRCUIT SLVS013H – MAY 1987 – REVISED MARCH 2002 schematic CATHODE Q14 Q11 24 kΩ 24 kΩ 6.6 kΩ Q8 20 pF Q7 30 pF Q10 10 kΩ 500 Ω Q2 Q9 30 kΩ Q4 ADJ Q1 6.6 kΩ Q6 Q3 Q12 Q5 Q13 720 Ω ANODE All component values shown are nominal. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Reverse current, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Forward current, IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA Package thermal impedance, θJA, (see Notes 1 and 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W LP package . . . . . . . . . . . . . . . . . . . . . . . . . . 156°C/W PW package . . . . . . . . . . . . . . . . . . . . . . . . . 149°C/W Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D and LP packages . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operation at the absolute maximum TJ of 150°C can impact reliability. 2. The package thermal impedance is calculated in accordance with JESD 51-7 recommended operating conditions TA 2 LT1009C Operating free free-air air temperature range LT1009I POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MIN MAX 0 70 –40 85 UNIT °C LT1009 2.5-V INTEGRATED REFERENCE CIRCUIT SLVS013H – MAY 1987 – REVISED MARCH 2002 electrical characteristics at specified free-air temperature PARAMETER TA† TEST CONDITIONS D package VZ Reference voltage IZ = 1 mA D package LP package VF Forward voltage Adjustment range ∆VZ(t Z(temp)) Change in reference voltage with temperature αVZ Average temperature coefficient of reference voltage‡ 25°C LP package Full range IF = 2 mA IZ = 1 mA, VADJ = GND to VZ 25°C LT1009C LT1009I MIN TYP MAX MIN TYP 2.49 2.5 2.51 MAX 2.49 2.5 2.51 2.495 2.5 2.505 2.495 2.5 2.505 2.485 2.515 2.475 2.491 2.509 2.48 2.52 0.4 1 0.4 1 125 125 45 45 2.525 25°C IZ = 1 mA, VADJ = 0.6 V to VZ –0.6 V UNIT V V mV D package 5 15 4 15 25 30 Full range mV LP package 0°C to 70°C 15 ppm/°C –40°C to 85°C ∆VZ Change in reference voltage with current IZ = 400 µA to 10 mA ∆VZ/∆t Long-term change in reference voltage IZ = 1 mA zz Reference impedance IZ = 1 mA 25°C 20 2.6 10 2.6 6 mV Full range 12 25°C 20 25°C 0.3 Full range 10 20 1 1.4 0.3 ppm/khr 1 1.4 Ω † Full range is 0°C to 70°C for the LT1009C and –40°C to 85°C for the LT1009I. ‡ The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 LT1009 2.5-V INTEGRATED REFERENCE CIRCUIT SLVS013H – MAY 1987 – REVISED MARCH 2002 TYPICAL CHARACTERISTICS† REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE CHANGE IN REFERENCE VOLTAGE vs REFERENCE CURRENT 2.53 5 ∆V Z – Change in Reference Voltage – mV Iz = 1 mA V Z – Reference Voltage – V 2.52 2.51 2.5 2.49 2.48 2.47 – 50 – 25 100 0 25 50 75 TA – Free-Air Temperature – °C 4 3 2 1 0 125 0 4 8 12 16 IZ – Reference Current – mA 20 Figure 2 Figure 1 REVERSE CURRENT vs REVERSE VOLTAGE FORWARD VOLTAGE vs FORWARD CURRENT 10–1 1.2 TJ = 25°C V F – Forward Voltage – V I R – Reverse Current – A 1 10–2 10–3 TJ = 125°C 10–4 TJ = –55°C 0.6 0.4 0.2 TJ = 25°C 10–5 0.6 0.8 1 1.4 1.8 2.2 VR – Reverse Voltage – V 2.6 0 0.001 0.01 0.1 1 IF – Forward Current – mA Figure 4 Figure 3 †Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 10 LT1009 2.5-V INTEGRATED REFERENCE CIRCUIT SLVS013H – MAY 1987 – REVISED MARCH 2002 TYPICAL CHARACTERISTICS NOISE VOLTAGE vs FREQUENCY REFERENCE IMPEDANCE vs FREQUENCY 250 100 Iz = 1 mA TJ = 25°C Hz 200 V n – Noise Voltage – nV/ 10 1 0.1 0.01 0.1 1 10 f – Frequency – kHz 150 100 50 10 100 100 Figure 5 1k 10 k f – Frequency – Hz 100 k Figure 6 TRANSIENT RESPONSE 3.5 3 Output 2.5 Input and Output Voltages – V z z – Reference Impedance – Ω Iz = 1 mA TJ = –55°C to 125°C 2 1.5 1 0.5 5 kΩ Input 0 Output 8 Input 4 0 0 1 20 t – Time – µs Figure 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 LT1009 2.5-V INTEGRATED REFERENCE CIRCUIT SLVS013H – MAY 1987 – REVISED MARCH 2002 APPLICATION INFORMATION 5 V to 35 V 3.6 kΩ Output 10-kΩ Trim† LT1009 †This does not affect temperature coefficient. It provides ±5% trim range. Figure 8. 2.5-V Reference 3.6 V to 40 V V+ LM334 R V– 62 Ω LT1009 10 kΩ Figure 9. Adjustable Reference With Wide Supply Range LT1084 VI 10 µF IN ADJ OUT VO 10 µF 1.2 kΩ 374 Ω LT1009 2 kΩ Figure 10. Power Regulator With Low Temperature Coefficient 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 LT1009 2.5-V INTEGRATED REFERENCE CIRCUIT SLVS013H – MAY 1987 – REVISED MARCH 2002 APPLICATION INFORMATION 5V 5.1 kΩ 5V 5.1 kΩ 10 kΩ 1% LT1009 –5 V Output 9.76 kΩ 1% 500 Ω 5 kΩ –5 V Figure 11. Switchable ±1.25-V Bipolar Reference 1 µF 10 kΩ VI ≥ 6 V 1 kΩ – 10 kΩ 2.5 V 1 kΩ + + 100 kΩ LT1009 + LT1001C 20 µF 20 µF Figure 12. Low-Noise 2.5-V Buffered Reference POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. 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