19-4815; Rev 3; 3/11
Low-Cost, 3A, 4.5V to 28V Input, 350kHz, PWM
Step-Down DC-DC Regulator with Internal Switches
MAX5041
General Description
Features
o Up to 3A of Continuous Output Current
The MAX15041 low-cost, synchronous DC-DC convert-
er with internal switches delivers an output current up to
3A. The MAX15041 operates from an input voltage of
4.5V to 28V and provides an adjustable output voltage
o ±±1 Output Aꢀꢀurꢁꢀc Oꢂer ꢃeꢄperꢁture
o 4.5V to 28V Input Voltꢁge Rꢁnge
o Adjustꢁble Output Voltꢁge Rꢁnge froꢄ 0.606V to
from 0.6V to 90% of V , set with two external resistors.
IN
0.9 x V
IN
The MAX15041 is ideal for distributed power systems,
preregulation, set-top boxes, television, and other con-
sumer applications.
o Internꢁl ±70ꢄΩ R
High-Side ꢁnd ±05ꢄΩ
DS-ON
R
Low-Side Power Switꢀhes
DS-ON
o Fixed 350kHz Switꢀhing Frequenꢀc
o Up to 931 Effiꢀienꢀc
o Ccꢀle-Bc-Ccꢀle Oꢂerꢀurrent Proteꢀtion
o Progrꢁꢄꢄꢁble Soft-Stꢁrt
o Stꢁble with Low-ESR Cerꢁꢄiꢀ Output Cꢁpꢁꢀitors
o Sꢁfe Stꢁrtup into Prebiꢁsed Output
o Enꢁble Input ꢁnd Power-Good Output
The MAX15041 features a peak-current-mode PWM con-
troller with internally fixed 350kHz switching frequency
and a 90% maximum duty cycle. The current-mode con-
trol 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 by using a type II compensation scheme,
thereby allowing the use of all ceramic capacitors.
o Fullc Proteꢀted Agꢁinst Oꢂerꢀurrent ꢁnd
Oꢂerteꢄperꢁture
This synchronous buck regulator features internal
MOSFETs that provide better efficiency than asynchro-
nous 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.
o V
LDO Underꢂoltꢁge Loꢀkout
DD
o Spꢁꢀe-Sꢁꢂing, ꢃherꢄꢁllc Enhꢁnꢀed, 3ꢄꢄ x 3ꢄꢄ
Pꢁꢀkꢁge
Ordering Information
The MAX15041 also features thermal shutdown and
overcurrent protection (high-side sourcing and low-side
sinking), and an internal 5V LDO with undervoltage
lockout. In addition, this device ensures safe startup
when powering into a prebiased output.
PIN-
PACKAGE
ꢃOP
MARK
PARꢃ
ꢃEMP RANGE
MAX15041ETE+ -40°C to +85°C 16 TQFN-EP*
AGV
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Other features include an externally adjustable soft-start
that gradually ramps up the output voltage and reduces
inrush current. Independent enable control and power-
good signals allow for flexible power sequencing.
Typical Operating Circuit
INPUT
12V
The MAX15041 is available in a space-saving, high-
power, 3mm x 3mm, 16-pin TQFN-EP package and is
fully specified from -40°C to +85°C.
IN
BST
OUTPUT
EN
1.8V AT 3A
Applications
MAX15041 LX
Distributed Power Systems
Wall Adapters
V
DD
PGND
Preregulators
Set-Top Boxes
PGOOD
SS
FB
Televisions
PGOOD
COMP
xDSL Modems
SGND
Consumer Products
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