The MAX18066/MAX18166 current-mode, synchronous,
DC-DC buck converters deliver an output current up
to 4A with high efficiency. The devices operate from
an input voltage of 4.5V to 16V and provides an
adjustable output voltage from 0.606V to 90% of the
input voltage. The devices are ideal for distributed power
systems, notebook computers, nonportable consumer
applications, and preregulation applications.
The devices feature a PWM mode operation with
an internally fixed switching frequency of 500kHz
(MAX18066) and 350kHz (MAX18166) capable of 90%
maximum duty cycle. The devices automatically enter
skip mode at light loads. The current-mode control
architecture simplifies compensation design and ensures
a cycle-by-cycle current limit and fast response to line
and load transients. A high-gain transconductance error
amplifier allows flexibility in setting the external compensation,
simplifying the design and allowing for an allceramic
design.
The synchronous buck regulators feature internal
MOSFETs that provide better efficiency than
asynchronous solutions, while simplifying the design
relative to discrete controller solutions. In addition to
simplifying the design, the integrated MOSFETs minimize
EMI, reduce board space, and provide higher reliability by
minimizing the number of external components.
Additional features include an externally adjustable
soft-start, independent enable input and power-good
output for power sequencing, and thermal shutdown
protection. The devices offer overcurrent protection (highside
sourcing) with hiccup mode during an output shortcircuit
condition. The devices ensure safe startup when
powering into a prebiased output.
The MAX18066/MAX18166 are available in a 2mm x
2mm, 16-bump (4 x 4 array), 0.5mm pitch wafer-level
package (WLP) and are fully specified from -40°C to +85°C.
Applications
- Distributed Power Systems
- Home Entertainment (TV and Set-Top Boxes)
- Network and Datacom
- Preregulators for Linear Regulators
- Servers, Workstations, and Storage
