MAX15108 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – High-Efficiency, 8A, Current-Mode Synchronous Step-Down Switching Regulator

19-5917; Rev 0; 6/11
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High-Efficiency, 8A, Current-Mode
Synchronous Step-Down Switching Regulator
General Description
The MAX15108 high-efficiency, current-mode, synchro-
nous step-down switching regulator with integrated
power switches delivers up to 8A of output current. The
regulator operates from 2.7V to 5.5V and provides an
output voltage from 0.6V up to 95% of the input voltage,
making the device ideal for distributed power systems,
portable devices, and preregulation applications.
The IC utilizes a current-mode control architecture
with a high gain transconductance error amplifier.
The current-mode control architecture facilitates easy
compensation design and ensures cycle-by-cycle
current limit with fast response to line and load transients.
The regulator offers a selectable skip-mode functionality
to reduce current consumption and achieve a higher effi-
ciency at light output load. The low RDS(ON) integrated
switches ensure high efficiency at heavy loads while
minimizing critical inductance, making the layout design
a much simpler task with respect to discrete solutions.
The IC’s simple layout and footprint assures first-pass
success in new designs.
The regulator features a 1MHz, factory-trimmed fixed-
frequency PWM mode operation. The high switching
frequency, along with the PWM current-mode architecture
allows for a compact, all ceramic capacitor design.
The IC features a capacitor-programmable soft-start
to reduce input inrush current. Internal control circuitry
ensures safe-startup into a prebiased output. Power
sequencing is controlled with the enable input and
power-good output.
The IC is available in a 20-bump (4 x 5 array), 2.5mm x
2mm, WLP package and is fully specified over the -40NC
to +85NC temperature range.
Applications
Distributed Power Systems
DDR Memory
Base Stations
Portable Devices
Notebook Power
Server Power
Features
S Continuous 8A Output Current
S Efficiency Up to 96%
S ±1% Accuracy Over Load, Line, and Temperature
S Operates from a 2.7V to 5.5V Supply
S Adjustable Output from 0.6V to 0.95 x VIN
S Programmable Soft-Start
S Safe Startup into Prebiased Output
S External Reference Input
S 1MHz Switching Frequency
S Stable with Low-ESR Ceramic Output Capacitors
S Skip Mode or Forced PWM Mode
S Enable Input and Power-Good Output for Power-
Supply Sequencing
S Cycle-by-Cycle Overcurrent Protection
S Fully Protected Features Against Overcurrent and
Overtemperature
S Input Undervoltage Lockout
S 20-Bump (4 x 5 Array), 2.5mm x 2mm, WLP
Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX15108EWP+ -40NC to +85NC
20 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
2.7V TO
5.5V
Typical Operating Circuit
SKIP
LX
EN
PGND
IN
MAX15108
FB
INX
PGOOD
COMP
OUTPUT
SS
________________________________________________________________ Maxim Integrated Products   1
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.