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 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)

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Typical Application *click for larger image Simplified Application	Block Diagram click for larger image Block Diagram
Typical Performance *click for larger image

Datasheet

Title		Size	Date	Other Language
	LM3000 Dual Synchronous Emulated Current-Mode Controller	801 Kbytes	2-Jul-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1951: Application Note 1951 LM3000 Evaluation Board	1497 Kbytes	1-Jul-09

More Application Notes

Title		Size	Date	Other Language
	AN-1378: Application Note 1378 Method For Calculating Output Voltage Tolerances in Adjustable Regulators	647 Kbytes	15-Jul-05	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3000ASQ	PVIP050	0	9960	0	0	855000	5	242608584
LM3000ASQX	PVIP050	0	9960	0	0	855000	5	242608584
LM3000SQ	PVIP050	0	9960	0	0	855000	5	242608584
LM3000SQX	PVIP050	0	9960	0	0	855000	5	242608584

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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