National Semiconductor Introduces the LM2611 Switching Regulator
National Semiconductor (Santa Clara, CA) introduced a new pulse-width modulation (PWM) inverting switching regulator. Capable of supplying -5V at 300mA from a 5V input, the new LM2611 is designed to deliver power for present and future hard disk drive designs or other voltage inverter requirements. The LM2611 is also suitable for creating the negative bias for active-matrix displays or CCDs in digital cameras, or creating ±5V for the tuners in set-top boxes and cable modems.
The LM2611 operates from inputs of 2.7V to 14V and is capable of producing a negative output voltage of up to ±36Vin. With its 0.5ohm switch, the LM2611 includes features such as internal compensation, cycle-by-cycle current limit and low noise.
"National's LM2611 was engineered with next-generation disk drives in mind," said John Perzow, strategic marketing manager in the power management group at National Semiconductor. "HDD designers can use the LM2611B to solve their MR pre-amp power needs now and, without changing anything except the switcher, use the LM2611A in tomorrow's drives as well. This helps to ensure a low-cost, fast track to market."
The LM2611 is available in two grades. The A-grade has a higher current limit of 1.2A, a lower Rds(on) of 0.5ohm and is priced at $1.28 each in 1,000-unit quantities. The B-grade has a lower current limit of 0.9A, an Rds(on) of 0.7ohm and is priced at $1.10 each in quantities of 1,000 units.
