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LTM4636 Scheda tecnica(PDF) 14 Page - Linear Technology |
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LTM4636 Scheda tecnica(HTML) 14 Page - Linear Technology |
14 / 36 page LTM4636 14 4636f For more information www.linear.com/LTM4636 The relationship of FREQV voltage to switching frequency is shown in Figure 3. For low output voltages from 0.6V to 1.2V, 350kHz operation is an optimal frequency for the best power conversion efficiency while maintaining the inductor current to about 45% of maximum load current. For output voltages from 1.5V to 1.8V, 500kHz is optimal. For output voltages from 2.5V to 3.3V, 700kHz is optimal. Seeefficiencygraphsforoptimalfrequencysetpoint.Limit the 2.5V and 3.3V outputs to 35A. The LTM4636 can be synchronized from 200kHz to 1200kHz with an input clock that has a high level above 2V and a low level below 1.2V. See the Typical Applica- tions section for synchronization examples. The LTM4636 minimum on-time is limited to approximately 100ns. The on-time can be calculated as: tON(MIN)= 1 FREQ • VOUT VIN applicaTions inForMaTion The LTM4636's CLKOUT pin phase difference from VOUT can be programmed by applying a voltage to the PHMODE pin.Thisvoltagecanbeprogrammedusingthe5.5VINTVCC pin. Most of the phase selections can be programmed by either grounding, floating, or tying this pin to INTVCC. The 60 degree phase shift will require 3/4 INTVCC and can be programmed with a voltage divider from the INTVCC pin. See Figure 4 for phase programming and the 2 to 6 phase connections. See Figure 27 for example design. Output Voltage Tracking Output voltage tracking can be programmed externally using the TRACK/SS pin. The output can be tracked up and down with another regulator. The master regulator’s output is divided down with an external resistor divider that is the same as the slave regulator’s feedback divider to implement coincident tracking. The LTM4636 uses an Figure 3. FREQ Voltage to Switching Frequency VFREQ (V) 0.4 900 1100 1300 1.0 1.4 4636 F03 700 500 0.6 0.8 1.2 1.6 1.8 300 100 |
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