MAX15109 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – High-Efficiency, 8A, Current-Mode Synchronous Step-Down Switching Regulator

19-5918; Rev 0; 6/11
High-Efficiency, 8A, Current-Mode Synchronous
Step-Down Switching Regulator with VID Control
General Description
The MAX15109 high-efficiency, current-mode, synchro-
nous step-down switching regulator with integrated
power switches deliver up to 8A of output current. This
regulator operates from 2.7V to 5.5V and provides four
output voltages using two VID control inputs.
This 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.
This regulator offers skip-mode functionality to reduce
current consumption and achieve a higher efficiency at
light loads. 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 high switching
frequency (1MHz), along with the PWM current-mode archi-
tecture allows for a compact, all-ceramic capacitor design.
The IC features a capacitor-programmable slew-rate
control to reduce input current at the startup and when
the output changes state under VID control. 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
Notebook Power
Features
S Continuous 8A Output Current
S Efficiency Over 90%
S ±1% Accuracy Over Load, Line, and Temperature
S Operates from a 2.7V to 5.5V Supply
S VID Control Inputs for Selecting Output Voltage
S Programmable Slew-Rate Control
S Safe Startup into Prebiased Output
S 1MHz Switching Frequency
S Stable with Low-ESR Ceramic Output Capacitors
S Enable Input and Power-Good Output for Power-
Supply Sequencing
S Cycle-by-Cycle Overcurrent Protection Faults
S Fully Protected 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
MAX15109EWP+ -40NC to +85NC
20 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
VID0
VID0
2.7V TO _VID1
VID1
5.5V
IN
LX
FB
PGND
OUTPUT
MAX15109
INX
PGOOD
COMP
SS
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