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LTC2927CTS8-PBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC2927CTS8-PBF Datasheet(HTML) 6 Page - Linear Technology |
6 / 16 page LTC2927 6 2927fb 2927 F01 1V/DIV 10ms/DIV MASTER SLAVE1 SLAVE2 Figure 1. Coincident Tracking 2927 F02 1V/DIV 10ms/DIV MASTER SLAVE1 SLAVE2 Figure 2. Offset Tracking 2927 F03 1V/DIV 10ms/DIV MASTER SLAVE1 SLAVE2 Figure 3. Ratiometric Tracking 2927 F04 1V/DIV 10ms/DIV SLAVE1 SLAVE2 MASTER Figure 4. Supply Sequencing Power Supply Tracking and Sequencing The LTC2927 handles a variety of power-up profiles to satisfy the requirements of digital logic circuits including FPGAs, PLDs, DSPs and microprocessors. These require- ments fall into one of the four general categories illustrated in Figures 1 to 4. Some applications require that the potential difference between two power supplies must never exceed a speci- fied voltage. This requirement applies during power-up and power-down as well as during steady-state operation, often to prevent destructive latch-up in a dual supply ASIC. Typically, this is achieved by ramping the supplies up and down together (Figure 1). In other applications it is desirable to have supplies ramp up and down with fixed voltage offsets between them (Figure 2) or to have them ramp up and down ratiometrically (Figure 3). Certain applications require one supply to come up after another. For example, a system clock may need to start before a block of logic. In this case, the supplies are se- quenced as in Figure 4 where the 2.5V supply ramps up after the 1.8V supply is completely powered. Operation The LTC2927 provides a simple solution to all of the power supply tracking and sequencing profiles shown in Figures 1 to 4. A single LTC2927 controls a single sup- ply that tracks to a “master” signal. With two resistors, a slave supply is configured to ramp up as a function of the master signal. This master signal can be a separate supply or it can be a ramp signal generated by tying the RAMP pin to an external capacitor. Tracking Cell The LTC2927’s operation is based on the tracking cell shown in Figure 5, which uses a proprietary wide-range current mirror. The tracking cell shown in Figure 5 servos the TRACK pin at 0.8V. The current supplied by the TRACK APPLICATIO S I FOR ATIO |
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