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LM3000 Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM3000 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 41 page LM3000 www.ti.com SNVS612A – JULY 2009 – REVISED JULY 2009 LM3000 Dual Synchronous Emulated Current-Mode Controller Check for Samples: LM3000 1 FEATURES MHz • Startup with pre-bias load 2 • VIN range from 3.3V to 18.5V • Independent power good, enable, soft-start • Output voltage from 0.6V to 80% of VIN and track • Remote differential output voltage sensing • Programmable current limit without external • 1% accuracy at FB pin sense resistor • Interleaved operation reduces input capacitors • Hiccup mode short circuit protection • Frequency sync/adjust from 200 kHz to 1.5 DESCRIPTION The LM3000 is a dual output synchronous buck controller which is designed to convert input voltages ranging from 3.3V to 18.5V down to output voltages as low as 0.6V. The two outputs switch at a constant programmable frequency of 200 kHz to 1.5 MHz, with the second output 180 degrees out of phase from the first to minimize the input filter requirements. The switching frequency can also be phase locked to an external frequency. A CLKOUT provides an external clock 90 degrees out of phase with the main clock so that a second chip can be run out of phase with the main chip. The emulated current-mode control utilizes bottom side FET sensing to provide fast transient response and current limit without the need for external current sense resistors or RC networks. Separate Enable, Soft-Start and Track pins allow each output to be controlled independently to provide maximum flexibility in designing system power sequencing. The LM3000 has a full range of protection features which include input under-voltage lock-out (UVLO), power good (PGOOD) signals for each output, over-voltage crowbar and hiccup mode during short circuit events. Applications • DC Power Distribution Systems • Graphic Cards - GPU and Memory ICs • FPGA, CPLD, and ASICs • Embedded Processor • 1.8V and 2.5V I/O Supplies • Networking Equipment (Routers, Hubs) 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2009, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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