LT1029AMH

LT1029/LT1029A 5V Bandgap Reference FEATURES ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO 0.2% Output Tolerance 0.6Ω Shunt Impedance 700µA to 10mA Operating Current Pin Compatible with LM136-5 20ppm/°C Max Drift Output Voltage Trim does not Affect Drift Can be Used as Positive or Negative Reference The LT ®1029 is a 5V bandgap reference intended for use in the shunt or “Zener” mode, allowing it to be used as either a positive or negative reference. The output is pretrimmed to ± 0.2% accuracy with 20ppm/°C maximum temperature drift. A trim pin allows additional output adjustment for even more precise output voltage. Operating current range for the LT1029 is 700µA to 10mA. Extremely low dynamic impedance allows excellent output regulation even with fluctuating operating current. The LT1029 will replace an LM136-5 or LM336-5 and simplify circuits using the “minimum temperature coefficient” trim network. The LT1029 does not require this special network to meet its temperature drift specification; these application network components are simply removed. If output trimming is required for initial accuracy, the diodes in the trim network should be replaced with jumpers. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S ■ ■ ■ ■ A-to-D and D-to-A Converters Precision Regulators Precision Current Sources V to F and F to V Converters TYPICAL APPLICATIO 15V R1 10k 5.015 5.010 5V LT1029 OUTPUT VOLTAGE (V) 5.005 5.000 4.995 4.990 4.895 –50 LT1029 –5V R2 10k –15V LT1029 • TA01 –25 U Output Voltage Drift 0 25 50 75 TEMPERATURE (°C) 100 125 LT1029 • TA02 U U 1029afa 1 LT1029/LT1029A ABSOLUTE AXI U RATI GS Reverse Current .................................................... 15mA Forward Current ................................................... 10mA Operating Temperature Range LT1029C/LT1029AC ............................... 0°C to 70°C LT1029M/LT1029AM (OBSOLETE) ....– 55°C to 125°C PACKAGE/ORDER I FOR ATIO BOTTOM VIEW ADJ + – ORDER PART NUMBER LT1029AMH LT1029MH LT1029ACH LT1029CH BOTTOM VIEW ADJ + – H PACKAGE TO-46 METAL CAN TJMAX = 150°C, θJA = 440°C/W, θJC = 80°C/W OBSOLETE PACKAGE Consider the Z Package as an Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS PARAMETER Reverse Breakdown Voltage Reverse Breakdown Change with Current Reverse Dynamic Impedance Temperature Stability CONDITIONS IR = 1mA The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. MIN 4.99 4.95 ● LT1029AM/LT1029AC LT1029M/LT1029C 700µA ≤ IR ≤ 10mA IR = 1mA ● IR = 1mA Equivalent Temperature Drift LT1029AM/LT1029AC LT1029C LT1029M Long Term Stability Trim Range Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. ±3 2 U U W WW U W (Note 1) Storage Temperature ............................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C ORDER PART NUMBER LT1029ACZ LT1029CZ Z PACKAGE TO-92 PLASTIC TJMAX = 100°C, θJA = 160°C/W TYP 5.00 5.00 2 3 0.2 0.3 3 5 7 10 8 12 15 20 + 5, – 13 MAX 5.01 5.05 5 8 0.6 1.0 7 12 18 36 20 34 40 UNITS V V mV mV Ω Ω mV mV mV mV ppm/°C ppm/°C ppm/°C ppm/kHr % LT1029AC LT1029C LT1029AM LT1029M ● ● ● ● ● ● ● 1029afa LT1029/LT1029A TYPICAL PERFOR A CE CHARACTERISTICS Reverse Characteristics 1.0 0.9 0.8 0.7 CURRENT (mA) APPLICATIO S I FOR ATIO Output Trimming Output voltage trimming on the LT1029 is nominally accomplished with a potentiometer connected from output to ground with the wiper tied to the trim pin. The LT1029 was made compatible with existing references, so the trim range is large; 5%, – 13%. 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 a 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. The worst case error in initial output voltage for the LT1029A is 0.2% and the LT1029 is 1%, so a series resistor is satisfactory if the output is simply trimmed to nominal value. 1ppm/°C TC shift would be the maximum expected for the LT1029A and 5ppm/°C for the LT1029. Shunt Capacitance The LT1029 is stable with all values of shunt capacitance, but values between 300pF and 0.01µF are not recommended because they cause longer settling following a 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 W UW 0.6 0.5 0.4 0.3 0.2 0.1 0 0 7 6 4 1 3 2 5 OUTPUT TO GROUND VOLTAGE (V) 8 TJ = 125°C TJ = – 55°C TJ = 25°C LT1029 • TPC01 UU transient in operating current. A 1µF solid tantalum capacitor is suggested for most situations where bypassing is desirable. Wide Trim Range (5%, – 13%) V+ I ≥ 900µA VREF 25k LT1029 • AI01 Narrow Trim Range V+ I ≥ 800µA VREF = 5.000V R1* 100k TRIM RANGE 0.4% – LT1029A, R1 = 750k 1.2% – LT1029, R1 = 250k LT1029 • TA02 Trimming Output to 5.120V V+ I ≥ 800µA VREF = 5.120V R1 41.2k R2 5k R3 4.02k LT1029 • AI03 1029afa 3 LT1029/LT1029A APPLICATIO S I FOR ATIO LT1029 PACKAGE DESCRIPTIO H Package 2-Lead and 3-Lead TO-46 Metal Can (Reference LTC DWG # 05-08-1340) .209 – .219 (5.309 – 5.537) .178 – .195 (4.521 – 4.953) .500 (12.700) MIN SEATING* PLANE .036 – .046 (0.914 – 1.168) .050 (1.270) TYP .100 (2.540) TYP PIN 1 FOR 3-LEAD PACKAGE ONLY 45° .028 – .048 (0.711 – 1.219) H02/03(TO-46) 0801 .085 – .105 (2.159 – 2.667) REFERENCE PLANE .025 (0.635) MAX .016 – .019** (0.406 – 0.483) DIA *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND .050" BELOW THE REFERENCE PLANE .016 – .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 – 0.610) OBSOLETE PACKAGE Z Package 3-Lead Plastic TO-92 (Similar to TO-226) (Reference LTC DWG # 05-08-1330) .060 ± .005 (1.524± 0.127) DIA .180 ± .005 (4.572 ± 0.127) .060 ± .010 (1.524 ± 0.254) .180 ± .005 (4.572 ± 0.127) .90 (2.286) NOM 5° NOM .500 (12.70) MIN .050 UNCONTROLLED (1.270) LEAD DIMENSION MAX .050 (1.27) BSC .016 ± .003 (0.406 ± 0.076) 4 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com U Split ± 2.5V References R1 25k 0.1% R2 25k 0.1% 2.5V 5V U W UU – LT1001 + – 5V – 2.5V R3 1k 5% – 5V LT1029 • AI04 .050 (1.270) TYP 3 2 1 .140 ± .010 (3.556 ± 0.127) 10° NOM .015 ± .002 (0.381 ± 0.051) Z3 (TO-92) 0801 TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION .098 +.016/–.04 (2.5 +0.4/–0.1) 2 PLCS 1029afa LT/TP 1102 1K REV A • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 1985