26 Jan 2012

Analog Devices multi-output regulators reduce component count and boost power density

Analog Devices has introduced ADP5041 and ADP5040 multi-output regulators to meet the increasing demand for greater power density.

The regulators combine a 3MHz, 1.2A buck regulator and two 300mA LDOs in a small 20-lead LFCSP package.

While discrete power solutions require up to 14 components and 126 mm2 of board space, these integrated regulators use only nine components and 50 mm2 of board space.

The ADP5041 and ADP5040 are designed for mid-range FPGA, microprocessor and DSP systems where core, IO and memory voltages are necessary.

The ADP5041 regulator’s on-chip watchdog timer is said to provide greater reliability by monitoring code execution integrity in processor-based systems and resetting the processor if it fails to strobe within a preset timeout period.

It also features a high accuracy (±1.5% over temperature) reset generator that can be externally programmed to monitor low-voltage power-supply rails. It also has a special circuit that detects a three-state condition when applied to the watchdog refresh input at the WDI pin typically controlled by a processor/DSP output port.

Both regulators reduce thermal dissipation by using high-efficiency switching regulators with up 96 percent buck power efficiency.

For low-noise analog circuit applications, the LDOs maintain a power supply rejection greater than 60 dB for frequencies as high as 10 kHz while operating with a low headroom voltage.

Each regulator provides a three-rail system power supply (1.2-A buck regulator and two 300-mA LDOs) with adjustable output voltages, which allows output voltages to be easily set using an external resistor divider network.

The 3MHz buck regulator switching frequency allows small ceramic inductors to be used to further reduce solution size and cost. These features allow the ADP5041 and ADP5040 to be easily and quickly modified for a variety of applications with short product design schedules such as portable medical and industrial devices.

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