GENERAL DESCRIPTION

The ADP5051 combines four high performance buck regulators and a supervisory circuit with a voltage monitor, a watchdog function, and a manual reset in a 48-lead LFCSP package that meets demanding performance and board space requirements. The device enables direct connection to high input voltages up to 15.0 V with no preregulators.

Channel 1 and Channel 2 integrate high-side power MOSFET and low-side MOSFET drivers. In low-side power devices, use external NFETs to achieve an efficiency optimized solution and deliver a programmable output current of 1.2 A, 2.5 A, or 4 A.

Combining Channel 1 and Channel 2 in a parallel configuration provides a single output with up to 8 A of current. Channel 3 and Channel 4 integrate both high-side and low-side MOSFETs to deliver an output current of 1.2 A.

The ADP5051 supervisory circuits monitor the voltage level. The watchdog timer generates a reset when the WDI pin does not toggle within a preset timeout period. Select manual reset functionality via the processor reset mode or system power on/off switch mode.

The optional I2C interface offers flexible configurations, including adjustable and fixed output voltage, junction temperature overheat warning, low input voltage detection, and dynamic voltage scaling.

FEATURES

Wide input voltage range: 4.5 V to 15.0 V

±1.5 output accuracy over full temperature range

250 kHz to 1.4 MHz adjustable switching frequency

Adjustable/fixed output options via factory fuse or I2C interface

I2C interface with interrupt on fault conditions

Power regulation

Channel 1 and Channel 2: programmable 1.2 A/2.5 A/4 A

sync buck regulators with low-side FET driver

Channel 3 and Channel 4: 1.2 A sync buck regulators

Single 8 A output (Channel 1 and Channel 2 in parallel)

Dynamic voltage scaling (DVS) for Channel 1 and Channel 4

Precision enable with 0.8 V accurate threshold

Active output discharge switch

Programmable phase shift in 90° steps

Individual channel FPWM/PSM selection

Frequency synchronization input or output

Optional latch-off protection on OVP/OCP failure

Power-good flag on selected channels

Low input voltage detection

Open-drain processor reset with external adjustable threshold

monitoring

Watchdog refresh input

Manual reset input

Overheat detection on junction temperature

UVLO, OCP, and TSD protection

APPLICATIONS

Small cell base stations

FPGA and processor applications

Security and surveillance

Medical applications