Multi-output regulators

22 February 2012 Power Electronics / Power Management

Analog Devices is targeting industrial, medical and communications equipment designers with the introduction of the ADP5041 and ADP5040 multi-output regulators. The devices meet the increasing demand for greater power density by combining a high-efficiency, 3 MHz, 1,2 A buck regulator and two 300 mA LDOs (low dropout regulators) in a small 20-lead LFCSP package.

The regulators are power management companions to mid-range FPGA, microprocessor and DSP systems where core, I/O and memory voltages are necessary.

The ADP5041’s on-chip watchdog timer enhances 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. A wide range of ordering options is also available to address multiple reset and watchdog timings.

The ADP5041 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. When the processor sets this port in three-state mode, the watchdog refresh timer is disabled, preventing a watchdog reset to the processor. This feature is important when supporting processor/DSP sleep operation where the core is disabled and watchdog timer cannot be refreshed.

The ADP5041 and ADP5040 use high-efficiency switching regulators with up 96% 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. The ADP5041 and ADP5040 also provide 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.

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