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LT6656AIS6-2.5TRPBF Datasheet(PDF) 7 Page - Linear Technology |
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LT6656AIS6-2.5TRPBF Datasheet(HTML) 7 Page - Linear Technology |
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7 / 12 page  LT6656 6656f 2.52V 2.50V VOUT 2.48V 1mA IOUT 2mA 5ms/DIV 6656 F04 2.52V 2.50V VOUT 2.48V 0µA IOUT 100µA 5ms/DIV 6656 F03 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 sup- ply from VOUT + 10mV to 18V, depending on the load current and operating temperature (see Dropout Voltage in the Typical Performance 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 2.5V. 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. Bypass and Load Capacitance The LT6656 voltage reference needs an input bypass capacitor of 0.1µF or larger, however, the bypassing of other local devices may serve as the required component. Figure 1. Turn-On Characteristics, CL = 1µF Figure 3. Transient Response, 0µA to 100µA Load Step (R2 = 24.9k, R1 = Open) Figure 2. Transient Load Test Circuit VIN 3V 4 6 2N7000 R2 1, 2 CIN 0.1µF CL 1µF VGEN 3V 6656 F02 R1 LT6656-2.5 Figure 4. Transient Response, 1mA to 2mA Load Step (R1 = R2 = 2.49k) 1V/DIV VIN VOUT 1ms/DIV 6656 F01 The output of the device requires a capacitance of 1µF or larger. With its low sensitivity to ESR, the LT6656 is stable with a wide variety of capacitor types including ceramic, tantalum and electrolytic. 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 out- put 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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