Norwood, MA (01/23/2012) - - (ADI) is continuing to help industrial, medicalcommunications equipment designers improve power system performance by reducing board space with the introduction today of the multi-output regulators. The regulators meet the increasing demand for greater power density by combining a high-efficiency, 3-MHz, 1.2-A buck regulatortwo 300-mA LDOs (low dropout regulators) in a small 20-lead LFCSP package. Unlike discrete power solutions that require up to 14 components126 mm2 of board space, these highly integrated regulators provide a more integrated circuit solution using only nine components50 mm2 of board space, to increase performancereliabilitylower system cost.

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More About the ADP5041ADP5040 Multi-output Regulators

The ADP5041ADP5040 are ideal power management companions to mid-range FPGAs, microprocessorDSP systems where core, IOmemory voltages are necessary. The ADP5041 regulator's on-chip watchdog timer provides greater reliability by monitoring code execution integrity in processor-based systemsresetting the processor if it fails to strobe within a preset timeout period. The ADP5041 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 also is available to address multiple resetwatchdog 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 disabledwatchdog timer cannot be refreshed.

The ADP5040ADP5041 multi-output 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. The ADP5041ADP5040 also provide a three-rail system power supply (1.2-A buck regulatortwo 300-mA LDOs) with adjustable output voltages, which allows output voltages to be easily set using an external resistor divider network. The 3-MHz buck regulator switching frequency allows small ceramic inductors to be used to further reduce solution sizecost. These features allow the ADP5041ADP5040 to be easilyquickly modified for a variety of applications with short product design schedules such as portable medicalindustrial devices.

ADP5041 andADP5040 Multi-output Regulator Key Features:
  • One 1.2-A buck regulator
    • Output voltage range = 0.8 V to 3.8 V
    • Current mode topology for excellent transient response
    • 3-MHz operating frequency
    • Peak efficiency up to 96 percent
    • Regulator total accuracy: ±3 percent
  • Two 300-mA LDOs
    • Output voltage range = 0.8 V to 4.75 V
    • Low input supply voltage from 1.7 V to 5.5 V
    • Stable with 2.2-