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LTC2925 Datasheet(PDF) 7 Page - Linear Technology |
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LTC2925 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 20 page  LTC2925 7 2925f APPLICATIO S I FOR ATIO Power Supply Tracking and Sequencing The LTC2925 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 illus- trated 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 IC. Typically, this is achieved by ramping the supplies up and down together (Figure 1). In other applications it is desir- able to have the 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 1.8V supply ramps up completely followed by the 2.5V supply and then the 1.5V supply. Operation The LTC2925 provides a simple solution to all of the power supply tracking and sequencing profiles shown in Figures 1 to 4. A single LTC2925 controls up to four supplies with three “slave” supplies that track a “master” signal. With just two resistors, a slave supply is configured to ramp up as a function of the master signal. This master signal can be a fourth supply that is ramped up through an external FET, whose ramp rate is set with a single capacitor, or it can be a signal generated by tying the GATE and RAMP pins to an external capacitor. SLAVE1 SLAVE2 SLAVE3 10ms/DIV 2925 F02 10ms/DIV 2925 F01 1V/DIV Figure 1. Coincident Tracking Figure 3. Ratiometric Tracking Figure 2. Offset Tracking Figure 4. Supply Sequencing SLAVE1 SLAVE2 SLAVE3 10ms/DIV 2925 F04 10ms/DIV 2925 F03 2V/DIV 1V/DIV 2V/DIV MASTER MASTER SLAVE1 SLAVE2 SLAVE3 MASTER SLAVE2 SLAVE1 SLAVE3 |
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