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LM3000 датащи(PDF) 1 Page - Texas Instruments

номер детали LM3000
подробное описание детали  Dual Synchronous Emulated Current-Mode Controller
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM3000 датащи(HTML) 1 Page - Texas Instruments

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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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