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LT1019ACN8-2.5 Datasheet(PDF) 8 Page - Linear Technology |
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LT1019ACN8-2.5 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LT1019 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 propor- tional to absolute temperature (PTAT) with a slope of approximately 2.1mV/ °C.Roomtemperaturevoltageis 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 refer- ence. 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 capaci- tance between 400pF and 2 µF (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 1 µF if the capacitor has low ESR (Effective Series Resistance). This can make the output “ring” with tran- 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 com- promised 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. APPLICATIO S I FOR ATIO TYPICAL APPLICATIO S Wide Range Trim ≥ ±5% Narrow Trim Range ( ±0.2%) VIN 2 Ω TO 5Ω LT1019 1019 F01 2 µF TANTALUM VIN LT1019 2 µF TO 10µF TANTALUM 2 Ω TO 5Ω (a) (b) + + VOUT R1 25k OUT IN LT1019 TRIM GND VIN 1019 TA03 VOUT R1 100k OUT IN LT1019 TRIM GND VIN 1019 TA05 R2* 1.5M *INCREASE TO 4.7M FOR LT1019A ( ±0.05%) |
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