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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX15041 Datasheet

Step-Down DC-DC Regulator

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19-4815; Rev 3; 3/11
EVAALVUAAILTAIOBNLEKIT
Low-Cost, 3A, 4.5V to 28V Input, 350kHz, PWM
Step-Down DC-DC Regulator with Internal Switches
General Description
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
from 0.6V to 90% of VIN, set with two external resistors.
The MAX15041 is ideal for distributed power systems,
preregulation, set-top boxes, television, and other con-
sumer applications.
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.
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.
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.
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.
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.
Applications
Distributed Power Systems
Wall Adapters
Preregulators
Set-Top Boxes
Televisions
xDSL Modems
Consumer Products
Features
o Up to 3A of Continuous Output Current
o ±1% Output Accuracy Over Temperature
o 4.5V to 28V Input Voltage Range
o Adjustable Output Voltage Range from 0.606V to
0.9 x VIN
o Internal 170mRDS-ON High-Side and 105m
RDS-ON Low-Side Power Switches
o Fixed 350kHz Switching Frequency
o Up to 93% Efficiency
o Cycle-By-Cycle Overcurrent Protection
o Programmable Soft-Start
o Stable with Low-ESR Ceramic Output Capacitors
o Safe Startup into Prebiased Output
o Enable Input and Power-Good Output
o Fully Protected Against Overcurrent and
Overtemperature
o VDD LDO Undervoltage Lockout
o Space-Saving, Thermally Enhanced, 3mm x 3mm
Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX15041ETE+ -40°C to +85°C 16 TQFN-EP* AGV
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
INPUT
12V
PGOOD
IN BST
EN
MAX15041 LX
VDD
PGND
PGOOD
SS
FB
COMP
SGND
OUTPUT
1.8V AT 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX15041 Datasheet

Step-Down DC-DC Regulator

No Preview Available !

Low-Cost, 3A, 4.5V to 28V Input, 350kHz, PWM
Step-Down DC-DC Regulator with Internal Switches
ABSOLUTE MAXIMUM RATINGS
IN to SGND.............................................................-0.3V to +30V
EN to SGND .................................................-0.3V to (VIN + 0.3V)
LX to PGND ................................-0.3V to min (+30V, VIN + 0.3V)
LX to PGND .....................-1V to min (+30V, VIN + 0.3V) for 50ns
PGOOD to SGND .....................................................-0.3V to +6V
VDD to SGND............................................................-0.3V to +6V
COMP, FB, SS to SGND..............-0.3V to min (+6V, VDD + 0.3V)
BST to LX .................................................................-0.3V to +6V
BST to SGND .........................................................-0.3V to +36V
SGND to PGND ....................................................-0.3V to +0.3V
LX Current (Note 1) ....................................................-5A to +8A
Converter Output Short-Circuit Duration ...................Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin TQFN (derate 14.7mW/°C above +70°C)
Multilayer Board .........................................................1666mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s package power dissipation.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 2)
16 TQFN-EP
Junction-to-Ambient Thermal Resistance (θJA).........+48°C/W
Junction-to-Case Thermal Resistance (θJC) ...............+7°C/W
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VIN = 12V, CVDD = 1µF, CIN = 22µF, TA = TJ = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
STEP-DOWN CONVERTER
Input-Voltage Range
Quiescent Current
VIN
IIN Not switching
4.5 28 V
2.1 4 mA
Shutdown Input Supply Current
ENABLE INPUT
VEN = 0V, VDD regulated by internal
LDO
VEN = 0V, VIN = VDD = 5V
2 12
µA
18 28
EN Shutdown Threshold Voltage
EN Shutdown Voltage Hysteresis
EN Lockout Threshold Voltage
EN Input Current
POWER-GOOD OUTPUT
VEN_SHDN VEN rising
VEN_HYST
VEN_LOCK VEN rising
VEN_LOCK_HYST
IEN VEN = 2.9V
1.4 V
100 mV
1.7 1.95 2.15
V
100 mV
2 5.3 9
µA
PGOOD Threshold
PGOOD Threshold Hysteresis
PGOOD Output Low Voltage
PGOOD Leakage Current
ERROR AMPLIFIER
VPGOOD_TH
VPGOOD_HYST
VPGOOD_OL
IPGOOD
VFB rising
IPGOOD = 5mA, VFB = 0.5V
VPGOOD = 5V, VFB = 0.7V
540 560 584
15
35 100
10
mV
mV
mV
nA
Error Amplifier
Transconductance
gMV
1.6 mS
Error Amplifier Voltage Gain
FB Set-Point Accuracy
AVEA
VFB
90
600 606 612
dB
mV
2 _______________________________________________________________________________________


Part Number MAX15041
Description Step-Down DC-DC Regulator
Maker Maxim Integrated Products
PDF Download

MAX15041 Datasheet PDF






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