MAX15118 Datasheet, PDF (1/23 Pages) Maxim Integrated Products – High-Efficiency, 18A, Current-Mode Synchronous Step-Down Regulator with Integrated Switches

19-5967; Rev 0; 6/11
EVALUATION KIT AVAILABLE
MAX15118
High-Efficiency, 18A, Current-Mode Synchronous
Step-Down Regulator with Integrated Switches
General Description
The MAX15118 high-efficiency, current-mode step-down
regulator with integrated power switches operates from
2.7V to 5.5V and delivers up to 18A of output current in
a small 2mm x 3.5mm package. The MAX15118 offers
excellent efficiency with skip mode capability at light-
load conditions, yet provides unmatched efficiency
under heavy load conditions. The combination of small
size and high efficiency makes this device suitable for
both portable and nonportable applications.
The MAX15118 utilizes a current-mode control archi­tecture
with a high-gain transconductance error ampli­fier, which
allows a simple compensation scheme and enables a
cycle-by-cycle current limit with fast response to line and
load transients. A factory-trimmed switching frequency of
1MHz (PWM operation) allows for a compact, all-ceramic
capacitor design.
Integrated switches with low on-resistance ensure high
efficiency at heavy loads while mini­mizing critical induc-
tances. The MAX15118’s simple layout and footprint
assure first-pass success in new designs.
Other features of the MAX15118 include a capacitor-
programmable soft-start to reduce inrush current, safe
startup into a prebiased output, an enable input, and a
power-good output for power sequencing.
The regulator is available in a 28-bump (4 x 7), 2.10mm
x 3.56mm WLP package, and is fully specified over the
-40NC to +85NC extended temperature range.
Features
S Continuous 18A Output Current Over Temperature
S ±1% Feedback Accuracy Over Load, Line, and
Temperature
S Operates from 2.7V to 5.5V Supply
S Input Undervoltage Lockout
S Adjustable Output Range from 0.6V Up to 0.94 x VIN
S Programmable Soft-Start
S Factory-Trimmed 1MHz Switching Frequency
S Stable with Low-ESR Ceramic Output Capacitors
S Safe-Startup into a Prebiased Output
S External Reference Input
S Selectable Skip Mode Option for Improved
Efficiency at Light Loads
S Enable Input/PGOOD Output Allows Sequencing
S Remote Ground Sense for Improved Accuracy
S Thermal and Overcurrent Protection
S Tiny 2.10mm x 3.56mm, 28-Bump WLP Package
Applications
Notebooks
Servers
Distributed Power Systems
DDR Memory
Base Stations
Ordering Information appears at end of data sheet.
Typical Operating Circuits
ON
OFF
VIN = 2.7V TO 5.5V
CIN
PGOOD
RPULL
CSS
EN
BST
SKIP
LX
AIN
MAX15118
GSNS
IN
FB
PGOOD
SS/REFIN
GND
COMP
CCC
PWM MODE OPERATION
Typical Operating Circuits continued at end of data sheet.
CBST
LOUT
RC
CC
COUT
VOUT
R1
R2
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX15118.related
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.