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LM2720M Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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LM2720M Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
1 / 8 page LM2720 5-Bit Programmable, High Frequency Multi-phase PWM Controller General Description The LM2720 provides an attractive solution for power sup- plies of high power microprocessors exhibiting ultra fast load transients. Compared to a conventional single-phase supply, an LM2720 based multi-phase supply distributes the thermal and electrical loading among components in multiple phases and greatly reduces the corresponding stress in each com- ponent. The LM2720 can be programmed to control either a 3-phase converter or a 4-phase converter. Phase shift among the phases is 120˚ in the case of three phase and 90˚ with four-phase. Because the power channels are out of phase, there can be significant ripple cancellation for both the input and output current, resulting in reduced input and output capacitor size. Due to the nominal operating fre- quency of 2 MHz per phase, the size of the output inductors can be greatly reduced which results in a much faster load transient response and a dramatically shrunk output capaci- tor bank. Microprocessor power supplies with all surface mount components can be easily built. The internal high speed transconductance amplifier guaran- tees good dynamic performance. The internal master clock frequency of up to 8 MHz is set by an external reference resistor. An external clock of 10 MHz can also be used to drive the chip to achieve frequency con- trol and multi-chip operation. The LM2720 also provides input under-voltage lock-out with hysteresis, input over-current protection and output voltage power good detection. Features n Ultra fast load transient response n Enables all surface-mount-design n Selectable 2, 3, 4 phase operation n Clock frequency from 40 kHz to 10 MHz n Precision load current sharing n 5-bit programmable from 3.5V to 1.3V n VID code compatible to VRM 8.X specification n Output voltage is 2.0V for VID code 11111 n Selectable internal or external clock n Digital 16-step soft start n Input under-voltage lock-out, over-current protection n Open-drain power good signal output Applications n Servers and workstations n High current, ultra-fast transient microprocessors Pin Configuration 24-Pin Plastic SOIC DS101322-1 Top View See NS Package Number M24B February 2000 © 2000 National Semiconductor Corporation DS101322 www.national.com |
Podobny numer części - LM2720M |
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Podobny opis - LM2720M |
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