- Range V from 3.3V to 18.5V
- Output voltages from 0.6V to 80% V
- Remote differential output voltage sensing
- 1% accuracy at the FB pin
- Crossover mode of operation reduces input capacitance
- Frequency synchronization/adjustment from 200 kHz to 1.5 MHz
- Start with a prebiased load
- Independent power good, enabled, soft-start and track
- Programmable current limit eliminates the need for an external sense resistor
- Hiccup mode short-circuit protection
illustrate
The LM3000 is a dual output synchronous buck controller designed to convert output voltages as low as 0.6V from 3.3V to 18.5V. Two outputs are programmable switching at a constant frequency of 200 kHz to 1.5 MHz, and the second output is 180 degrees from the first stage, minimizing input filter requirements. The switching frequency can also be locked to an external frequency stage. A CLKOUT provides a 90-degree phase that allows the second chip to run the stage of the main chip with an external clock of the master clock. Analog current-mode control uses bottom FET sensing to provide fast transient response and current limit without the need for an external current-sense resistor or RC network. Separate enable, soft-start, and tracking pins allow each independently controlled output to provide maximum flexibility in designing system power sequencing.
The LM3000 has a full range of protection features, including input undervoltage lockout (UVLO), power good (PGOOD) for each output signal, overvoltage pry bar and hiccup mode in the event of a short circuit.
apply
- DC power distribution system
- Graphics - GPU and memory ICs
- FPGAs, CPLDS and ASICs
- Embedded processors
- 1.8V and 2.5VI/O power supplies
- Network devices (routers, hubs)
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