LM3000

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SNVS612B – JULY 2009 – REVISED APRIL 2013

LM3000 Dual Synchronous Emulated Current-Mode Controller

Check for Samples: LM3000

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FEATURES

DESCRIPTION

The LM3000 is a dual output synchronous buck

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•

controller which is designed to convert input voltages

•

ranging from 3.3V to 18.5V down to output voltages

•

Remote Differential Output Voltage Sensing

as low as 0.6V. The two outputs switch at a constant

programmable frequency of 200 kHz to 1.5 MHz, with

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1% Accuracy at FB Pin

the second output 180 degrees out of phase from the

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Interleaved Operation Reduces Input

first to minimize the input filter requirements. The

Capacitors

switching frequency can also be phase locked to an

•

Frequency Sync/Adjust From 200 kHz to 1.5

external frequency. A CLKOUT provides an external

MHz

clock 90 degrees out of phase with the main clock so

that a second chip can be run out of phase with the

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Startup With Pre-Bias Load

main chip. The emulated current-mode control utilizes

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Independent Power Good, Enable, Soft-Start

bottom side FET sensing to provide fast transient

and Track

response and current limit without the need for

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Programmable Current Limit Without External

external current sense resistors or RC networks.

Separate Enable, Soft-Start and Track pins allow

Sense Resistor

each output to be controlled independently to provide

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Hiccup Mode Short Circuit Protection

maximum

flexibility

in

designing

system

power

sequencing.

APPLICATIONS

The LM3000 has a full range of protection features

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DC Power Distribution Systems

which include input under-voltage lock-out (UVLO),

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Graphic Cards - GPU and Memory ICs

power good (PGOOD) signals for each output, over-

voltage crowbar and hiccup mode during short circuit

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FPGA, CPLD, and ASICs

events.

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Embedded Processor

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1.8V and 2.5V I/O Supplies

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Networking Equipment (Routers, Hubs)

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2013, 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.