EVALUATION KIT AVAILABLE
MAX18066/MAX18166
High-Efficiency, 4A, Step-Down DC-DC
Regulators with Internal Power Switches
General Description
Benefits and Features
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.
● Feature Integration Shrinks Solution Size
• Integrated 40mΩ (High-Side) and 18.5mΩ
(Low-Side) R
Power MOSFETs
DS-ON
• Stable with Low-ESR Ceramic Output Capacitors
• Enable Input and Power-Good Output
• Cycle-by-Cycle Overcurrent Protection
• Fully Protected Against Overcurrent
(Hiccup Protection) and Overtemperature
● High Efficiency Conserves Power
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 com-
pensation, simplifying the design and allowing for an all-
ceramic design.
• Up to 96% Efficiency (5V Input and 3.3V Output)
• Up to 93% Efficiency (12V Input and 3.3V Output)
• Automatic Skip Mode During Light Loads
● Safe, Reliable, Accurate Operation
• Continuous 4A Output Current
• ±1% Output Accuracy over Load, Line, and
Temperature
• Safe Startup Into Prebiased Output
• Programmable Soft-Start
• V
LDO Undervoltage Lockout
DD
● Well Suited to Distributed Power, Networking, and
The synchronous buck regulators feature inter-
nal 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.
Computing Applications
• 4.5V to 16V Input Voltage Range
• Adjustable Output Voltage Range from 0.606V
to (0.9 x V )
IN
● Available in EE-Sim® Design and Simulation Tool to
Slash Design Time
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 (high-
side sourcing) with hiccup mode during an output short-
circuit condition. The devices ensure safe startup when
powering into a prebiased output.
Ordering Information appears at end of data sheet.
Typical Application Circuit
INPUT
4.5V TO 16V
IN
BST
LX
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.
1.8V/4A
OUTPUT
EN
MAX18066
MAX18166
V
DD
FB
COMP
Applications
● Distributed Power Systems
PGOOD
SS
● Preregulators for Linear Regulators
● Home Entertainment (TV and Set-Top Boxes)
● Network and Datacom
GND
● Servers, Workstations, and Storage
EE-Sim is a registered trademark of Maxim Integrated
Products, Inc.
19-100202; Rev 0; 11/17