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LM3000 반도체 회로 부품 판매점

Dual Synchronous Emulated Current Mode Controller



National Semiconductor 로고
National Semiconductor
LM3000 데이터시트, 핀배열, 회로
www.DataSheet4U.com
LM3000
July 2, 2009
Dual Synchronous Emulated Current-Mode Controller
General 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 ex-
ternal 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 pro-
vide 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 de-
signing system power sequencing.
The LM3000 has a full range of protection features which in-
clude input under-voltage lock-out (UVLO), power good
(PGOOD) signals for each output, over-voltage crowbar and
hiccup mode during short circuit events.
Features
VIN range from 3.3V to 18.5V
Output voltage from 0.6V to 80% of VIN
Remote differential output voltage sensing
1% accuracy at FB pin
Interleaved operation reduces input capacitors
Frequency sync/adjust from 200 kHz to 1.5 MHz
Startup with pre-bias load
Independent power good, enable, soft-start and track
Programmable current limit without external sense resistor
Hiccup mode short circuit protection
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)
Simplified Application
© 2009 National Semiconductor Corporation 300905
300905a1
www.national.com


LM3000 데이터시트, 핀배열, 회로
www.DataShCeeot4Un.cnomection Diagram
Ordering Information
Order Number Package Marking
LM3000ASQ
3000A
LM3000ASQX
3000A
LM3000SQ
3000
LM3000SQX
3000
Top View
32-Lead LLP
Package Type
32-Lead LLP
32-Lead LLP
32-Lead LLP
32-Lead LLP
NSC Package Drawing
SQA32A
SQA32A
SQA32A
SQA32A
30090502
Supplied As
1000 Units Tape and Reel
4500 Units Tape and Reel
1000 Units Tape and Reel
4500 Units Tape and Reel
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LM3000 controller

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