Triple Buck Regulator Integrated Power Solution

The ADP5055 combines three high performance buck regulators in a 43-terminal land grid array (LGA) package to meet demanding performance and board space requirements. The device enables direct connection to high input voltages up to 18 V with no preregulators. All channels integrate both high-side and low-side power metal-oxide semiconductor field effect transistors (MOSFETs) to achieve an efficiency optimized solution. Channel 1 and Channel 2 deliver a programmable output current of 3.5 A or 7 A or provide a single output with up to 14 A of current in parallel operation. Channel 3 delivers a programmable output current of 1.5 A or 3 A.

The switching frequency of the ADP5055 can be programmed or synchronized to an external clock. The ADP5055 contains an enable pin (ENx) on each channel for simple power-up sequencing or adjustable undervoltage lockout (UVLO) threshold.

The ADP5055 integrates a high precision 8-bit digital-to-analog converter (DAC) to enable the output voltage dynamic voltage scaling (DVS) via the PMBus®-compatible, 2-wire interface. The PMBus interface provides other flexible configurations, such as start-up and shutdown sequence control, individual forced pulse-width modulation or power saving mode (FPWM or PSM) selection, an output discharge switch, and a power-good signal.

The ADP5055 is rated at −40°C to +150°C junction temperature.

APPLICATIONS

* Small cell base stations

* Field programmable gate array (FPGA) and processor applications

* Security and surveillance

* Medical applications

* Wide input voltage range: 2.75 V to 18 V

* Bias input voltage range: 4.5 V to 18 V

* Operation up to 150°C junction temperature

* PMBus-compatible interface with configurable address

* FB1 voltage accuracy (default): −0.62% to +0.69% (−40°C ≤ TJ ≤ +125°C)

* Channel 1 and Channel 2: 7 A synchronous buck regulator (9.4 A minimum valley current-limit threshold)

* Channel 1 and Channel 2: 14 A output in parallel operation

* Channel 3: 3 A synchronous buck regulator (4.2 A minimum valley current-limit threshold)

* 8-bit precision DAC for DVS

* Adjustable feedback voltage range: 408 mV to 790.5 mV per 1.5 mV step

* Upper and lower threshold limit setting