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National Semiconductor op-amps, buck controller, serve automotive applications

National Semiconductor Corporation has introduced nine single, dual and quad operational amplifiers based on its proprietary VIP50 BiCMOS process. The products are said to offer improvements in accuracy, power consumption and voltage noise for automotive and other applications. The firm also introduced a synchronous buck controller with 1% voltage feedback accuracy across the -40 °C to 125 °C temperature range.

Five of the new op-amps stress gain-bandwidth performance. The 12 MHz, unity-gain bandwidth LMV654 quad amplifier is said to provide a 50% power saving compared with similar devices from other vendors. The LMV792 series features 5.8 nV/sqrt Hz noise and input bias currents of 100 fA from -40 °C to 125 °C. The LPV531 has adjustable gain-bandwidth control and a power-level adjust feature controlled with a single external resistor. Performance of the LPV531 alternates from standby to full-power mode by varying the bias voltage on the external resistor.

National also introduced the LMP7704, LMP7712, LMP7715 and LMP7716, which provide sub-220 µV of input offset with guaranteed input bias of less than 50 pA, and up to 12 V operation.

In addition to the op-amps, National added four products to its LM274x family of synchronous buck controllers, one of which, the LM2747, is said to be among the first voltage-mode pulse-width modulation (PWM) synchronous buck controllers offering 1% voltage feedback accuracy across an extended industrial temperature range. All four controllers provide precise core regulation in ASICs, DSPs and FPGAs, and are designed to work at higher frequencies, thus reducing power solution footprints.

Michael White, business unit director for National Semiconductor's Power Management Group, said the new controllers combine precision with complex-load-specific features. They offer pre-bias load start-up capability, soft-start with tracking, a precision enable for power rail sequencing, and external clock synchronization to reduce interaction with other supplies and sensitive load circuitry.

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