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LT6656ACS6-2.5PBF Datasheet(PDF) 9 Page - Linear Technology |
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LT6656ACS6-2.5PBF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 18 page  LT6656 6656fa applicaTions inForMaTion Long Battery Life Series references have a large advantage over shunt style references. Shunt references require a resistor from the power supply to operate. This resistor must be chosen to supply the maximum current that can be demanded by the load. When the load is not operating at this maximum current, the shunt reference must always sink this current, resulting in high dissipation and shortened battery life. The LT6656 series reference does not require a current setting resistor and is specified to operate with any supply from 1.5V to 18V, depending on the output voltage option, load current and operating temperature (see Dropout Voltage and Minimum Input Voltage in the Typical Perfor- mance Characteristics). When the load does not demand current, the LT6656 reduces its dissipation and battery life is extended. If the reference is not delivering load current, it dissipates only a few µW, yet the same connection can deliver 5mA of load current when required. Start-Up To ensure proper start-up, the output voltage should be between –0.3V and the rated output voltage. If the output load may be driven more than 0.3V below ground, a low forward voltage schottky diode from the output to ground is required. The turn-on characteristics can be seen in Figure 1. Figure 1. LT6656-2.5 Turn-On Characteristics, CL = 1µF Figure 2. Transient Load Test Circuit VIN 3V 2N7000 R2 CIN 0.1µF CL 1µF VGEN 3V 6656 F02 R1 LT6656-2.5 1V/DIV VIN VOUT 1ms/DIV 6656 F01 Output Voltage Options TheperformanceoftheLT6656isconsistentforthe2.048V to 5V options. The 1.25V option has slightly reduced load regulation, and unlike the higher voltage options, the minimum operating supply voltage is limited by internal circuitry rather than the output voltage. Parametersthatarebasedonchangesintheoutputvoltage, suchasloadregulationandhysteresis,remainproportional to the output voltage and are specified in relative units, for example, parts per million (ppm). Parameters that are not based on changes in the output voltage, such as supply current and reverse input current, are the same for all options. ThebandwidthoftheLT6656decreaseswithhigheroutput voltage. This causes parameters that are affected by both bandwidth and output voltage, such as wideband noise and output impedance, to increase less with higher output voltage. Bypass and Load Capacitance The LT6656 voltage reference needs a 0.1μF input bypass capacitor placed within an inch of the input pin. An ad- ditional 2.2μF capacitor should be used when the source impedance of the input supply is high or when driving heavy loads. The bypassing of other local devices may serve as the required components. The output of the LT6656 requires a capacitance of 1µF or larger. The LT6656 is stable with a wide variety of capacitor types including ceramic, tantalum and electrolytic due to its low sensitivity to ESR (5Ω or less). The test circuit in Figure 2 was used to test the response and stability of the LT6656 to various load currents. The resultant transient responses can be seen in Figure 3 and Figure 4. The large scale output response to a 500mV input step is shown in Figure 5 with a more detailed photo and description in the Output Settling section. |
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