MAX15058_11 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – High-Efficiency, 3A, Current-Mode Synchronous, Step-Down Switching Regulator

19-5478; Rev 2; 7/11
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High-Efficiency, 3A, Current-Mode
Synchronous, Step-Down Switching Regulator
General Description
The MAX15058 high-efficiency, current-mode, synchro-
nous step-down switching regulator with integrated
power switches delivers up to 3A of output current.
The device operates from 2.7V to 5.5V and provides an
output voltage from 0.6V up to 94% of the input voltage,
making the device ideal for distributed power systems,
portable devices, and preregulation applications.
The MAX15058 utilizes a current-mode control archi-
tecture with a high-gain transconductance error ampli-
fier. 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 MAX15058 offers selectable skip-mode functional-
ity to reduce current consumption and achieve a higher
efficiency at light output load. The low RDS(ON) inte-
grated switches ensure high efficiency at heavy loads
while minimizing critical inductances, making the layout
design a much simpler task with respect to discrete
solutions. Utilizing a simple layout and footprint assures
first-pass success in new designs.
The MAX15058 features a 1MHz, factory-trimmed, fixed-
frequency PWM mode operation. The high switching fre-
quency, along with the PWM current-mode architecture,
allows for a compact, all-ceramic capacitor design.
The MAX15058 offers a capacitor-programmable soft-
start reducing inrush current, startup into PREBIAS
operations, and a PGOOD open-drain output that can be
used as an interrupt and for power sequencing.
The MAX15058 is available in a 9-bump (3 x 3 array),
1.5mm x 1.5mm WLP package and is specified over the
-40NC to +85NC temperature range.
Applications
Distributed Power Systems
Preregulators for Linear Regulators
Portable Devices
Notebook Power
Server Power
IP Phones
Features
S Internal 30mI (typ) RDS(ON) High-Side and 18mI
(typ) Low-Side MOSFETs at 5V
S Continuous 3A Output Current Over Temperature
S 95% Efficiency with 3.3V Output at 3A
S 1% Output Voltage Accuracy Over Load, Line, and
Temperature
S Operates from 2.7V to 5.5V Supply
S Cycle-by-Cycle Overcurrent Protection
S Adjustable Output from 0.6V to 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 Prebiased Output
S External Reference Input
S Skip-Mode Functionality
S Enable Input/Power-Good Output
S Fully Protected Against Overcurrent and
Overtemperature
S Input Undervoltage Lockout
Ordering Information
PART
MAX15058EWL+
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
9 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
INPUT
2.8V TO 5.5V
ENABLE
ON
OFF
IN
LX
MAX15058 GND
PGOOD
EN
SKIP
FB
COMP
SS/REFIN
OUTPUT
1.8V/3A
________________________________________________________________ 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.