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Buck regulators,?LDOs occupy 69mm2 board area

Posted: 28 Jul 2011 ?? ?Print Version ?Bookmark and Share

Keywords:buck regulator? LDO? processors? FPGAs?

Analog Devices Inc. has released the ADP5034 regulator/LDO, a highly integrated power management IC that combines two 3MHz, high efficiency, 1.2A step down regulators with two 300mA LDO (low drop out) regulators in a small LFCSP (lead-frame chip-scale) package. The company also released the ADP5024 regulator/LDO, which is identical to the ADP5034 but features a single 300mA LDO regulator. Occupying a total board area of only 69mm2, the ADP5034 and ADP5024 step-down regulators/LDOs are designed to meet the shrinking board space and increasing performance requirements of processors and FPGAs.

Regulator, LDO

The ADP5034 and ADP5024 are flexible, highly integrated power management components

The integrated step-down regulators are 180 degrees out of phase to reduce input filtering, which allows smaller input capacitors to be used while reducing input noise. A dedicated mode pin places both regulators in forced PWM operation or auto PWM/PSM operation for higher efficiency. The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5034 and ADP5024 also enable more efficient power management. The integrated LDOs feature high 65dB PSRR (power-supply rejection ratio) performance that ranges from 1C10kHz, lowering output noise to 80?V/rms for powering sensitive analog circuitry.

The devices are flexible, highly integrated power management components that can be used in applications including USB-powered portable devices, handheld medical products and multi-voltage power applications for processors, ASICs, FPGAs and RF chipsets. Each component has dedicated enable pins for each of the step down regulators and LDOs and supports adjustable output voltages on all four regulator outputs, allowing the output voltages to be easily set using an external resistor divider network. Adjustable output voltage allows the ADP5034 and ADP5024 to be easily and quickly modified to work with different output voltage requirements, which reduces design time and time to market. The ADP5034 and ADP5024 are fully specified over the junction temperature range of -40CC125C and both are available in a 24-lead, 4 x 4mm LFCSP packages.

Samples of both the ADP5024 and the ADP5034 are available now. The ADP5034 is currently in full production, while the ADP5024 will be in full production by August 2011. The ADP5024 in 4 x 4mm 24-lead LFCSP is priced at $1.79 and the ADP5034 in 4 x 4mm 24-lead LFCSP is priced at $1.99. ADP5024-1-EVALZ and ADP5034-1-EVALZ are in full production and priced at $100.

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