NEW small footprint Power Management IC Integrates Two Buck Regulators and Two LDOs

Date: 28/7/2011

A new highly integrated power management IC from Analog Devices combines two 3-MHz, high efficiency, 1.2-A step down regulators with two 300-mA LDO (low drop out) regulators in a small LFCSP (lead-frame chip-scale) package.

The ADP5034 regulator/LDO integrated step-down regulator is a flexible, highly integrated power management component. The device is used 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. Power management efficiency is further boosted by the  ADP5034's low quiescent current, low dropout voltage and wide input voltage range. The integrated LDOs feature high 65-dB PSRR (power-supply rejection ratio) performance that ranges from 1 kHz to 10 kHz, lowering output noise to 80 μV/rms for powering sensitive analog circuitry.

According to Arthur Griffiths, Analog Devices product manager with Ismosys, the ADP5034 step down regulator/LDO is ideal for use in USB-powered portable devices and handheld medical products, and in multi-voltage power applications for processors, ASICs, FPGAs and RF chipsets: “The device features dedicated enable pins for each step down regulator and LDO and supports adjustable output voltages on all four regulator outputs, allowing the output voltages to be easily set using an external resistor divider network, Griffith said. “Adjustable output voltage enables the ADP5034 to be quickly and easily modified to work with different output voltage requirements, which reduces design effort and speeds time to market.”

Key Features and Benefits
• Two high efficiency 1.2 A buck regulators with adjustable or fixed output voltages for core voltage and I/O voltage in a processor based systems
• Two 300-mA LDOs with adjustable or fixed output voltage option for low noise analog circuitry
• Initial regulator accuracy of ±1 percent powers low-noise analog circuitry and enables processor and FPGA power loads where high reliability and tight voltage regulation across line, load and temperature are required
• Buck peak efficiency up to 96 percent improves system power efficiency and reduces thermal dissipation
• Factory-programmable or external adjustable output voltages provide maximum design flexibility

A companion device, the ADP5024 regulator/LDO, is identical to the ADP5034 but features a single 300-mA LDO regulator.  Both devices are fully specified over the junction temperature range of −40 °C to 125 °C and both are available in a 24-lead, 4 mm × 4 mm LFCSP packages

Data sheets can be downloaded by clicking here ADP5034 and here ADP5024