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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX15040 Datasheet

Step-Down Regulator

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19-4426; Rev 2; 7/10
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High-Efficiency, 4A, Step-Down Regulatowwrw.wDataiSthehet4U.com
Integrated Switches in 2mm x 2mm Package
General Description
The MAX15040 high-efficiency switching regulator
delivers up to 4A load current at output voltages from
0.6V to (0.9 x VIN). The device operates from 2.4V to
3.6V, making it ideal for on-board point-of-load and
postregulation applications. Total output-voltage accu-
racy is within ±1% over load, line, and temperature.
The MAX15040 features 1MHz fixed-frequency PWM
mode operation. The high operating frequency allows
for small-size external components.
The low-resistance on-chip nMOS switches ensure high
efficiency at heavy loads while minimizing critical parasitic
inductances, making the layout a much simpler task with
respect to discrete solutions. Following a simple layout
and footprint ensures first-pass success in new designs.
The MAX15040 incorporates a high-bandwidth
(> 15MHz) voltage-error amplifier. The voltage-mode
control architecture and the voltage-error amplifier per-
mit a Type III compensation scheme to achieve maxi-
mum loop bandwidth, up to 200kHz. High loop
bandwidth provides fast transient response, resulting in
less required output capacitance and allowing for all-
ceramic capacitor designs.
The MAX15040 features an output overload hiccup pro-
tection and peak current limit on both high-side (sourc-
ing current) and low-side (sinking and sourcing current)
MOSFETs, for ultra-safe operations in case of high out-
put prebias, short-circuit conditions, severe overloads,
or in converters with bulk electrolytic capacitors.
The MAX15040 features an adjustable output voltage.
The output voltage is adjustable by using two external
resistors at the feedback or by applying an external ref-
erence voltage to the REFIN/SS input. The MAX15040
offers programmable soft-start time using one capacitor
to reduce input inrush current. A built-in thermal shut-
down protection assures safe operation under all condi-
tions. The MAX15040 is available in a 2mm x 2mm,
16-bump (4 x 4 array), 0.5mm pitch WLP package.
Applications
Server Power Supplies
Point-of-Load
ASIC/CPU/DSP Core and I/O Voltages
DDR Power Supplies
Base-Station Power Supplies
Telecom and Networking Power Supplies
RAID Control Power Supplies
Features
o Internal 15mΩ RDS(ON) MOSFETs
o Continuous 4A Output Current
o ±1% Output-Voltage Accuracy Over Load, Line,
and Temperature
o Operates from 2.4V to 3.6V Supply
o Adjustable Output from 0.6V to (0.9 x VIN)
o Adjustable Soft-Start Reduces Inrush Supply
Current
o Factory-Trimmed 1MHz Switching Frequency
o Compatible with Ceramic, Polymer, and
Electrolytic Output Capacitors
o Safe Startup into Prebias Output
o Enable Input/Power-Good Output
o Fully Protected Against Overcurrent and
Overtemperature
o Overload Hiccup Protection
o Sink/Source Current in DDR Applications
o 2mm x 2mm, 16-Bump (4 x 4 Array), 0.5mm Pitch
WLP Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX15040EWE+
-40°C to +85°C
16 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
INPUT
2.4V TO 3.6V
IN BST
MAX15040
EN
VDD
LX
GND
OUTPUT
FB
REFIN/SS
COMP
VDD
PWRGD
GND
Pin Configuration appears at end of data sheet.
________________________________________________________________ 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

MAX15040 Datasheet

Step-Down Regulator

No Preview Available !

High-Efficiency, 4A, Step-Down Regulatorwwww.iDtatahSheet4U.com
Integrated Switches in 2mm x 2mm Package
ABSOLUTE MAXIMUM RATINGS
IN, VDD, PWRGD to GND ......................................-0.3V to +4.5V
LX to GND....................-0.3V to the lower of 4.5V or (VIN + 0.3V)
LX Transient ..............(VGND - 1.5V, <50ns), (VIN + 1.5V, <50ns)
COMP, FB, REFIN/SS,
EN to GND ..............-0.3V to the lower of 4.5V or (VDD + 0.3V)
LX RMS Current (Note 1) .........................................................5A
BST to LX..................................................................-0.3V to +4V
BST to GND ..............................................................-0.3V to +8V
Continuous Power Dissipation (TA = +70°C)
16-Bump (4 x 4 Array), 0.5mm Pitch WLP
(derated 12.5mW/°C above +70°C)...........................1000mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Continuous Operating Temperature at
Full Load Current (Note 2) ...........................................+105°C
Storage Temperature Range .............................-65°C to +150°C
Soldering Temperature (reflow) .......................................+260°C
Note 1: LX has internal clamp diodes to GND and IN. Applications that forward bias these diodes should take care not to exceed
the package power dissipation limit of the device.
Note 2: Continuous operation at full current beyond +105°C may degrade product life.
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.
ELECTRICAL CHARACTERISTICS
(VIN = VDD = 3.3V, TA = -40°C to +85°C. Typical values are at TA = +25°C, circuit of Figure 1, unless otherwise noted.) (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX
IN/VDD
IN and VDD Voltage Range
IN Supply Current
VDD Supply Current
Total Supply Current (IN + VDD)
Total Shutdown Current from IN
and VDD
VDD Undervoltage Lockout
Threshold
VDD UVLO Deglitching
BST
No load, no switching
No load, no switching
No load
VIN = 2.5V
VIN = 3.3V
VIN = 2.5V
VIN = 3.3V
VIN = VDD = 2.5V
VIN = VDD = 3.3V
VIN = VDD = VBST - VLX = 3.6V, VEN = 0V
LX starts/stops switching
VDD rising
VDD falling
2.40 3.60
0.52 1
0.8 1.5
3.7 5.5
46
12
23
0.1 2
2
1.75 1.9
2
2.2
BST Leakage Current
PWM COMPARATOR
VBST = VDD = VIN = 3.6V,
VLX = 3.6V or 0V, VEN = 0V
TA = +25°C
TA = +85°C
0.025
2
PWM Comparator Propagation
Delay
10mV overdrive
10
COMP
COMP Clamp Voltage High
COMP Clamp Voltage Low
COMP Slew Rate
VDD = 2.4V to 3.6V
VDD = 2.4V to 3.6V
2.03
0.73
1.6
PWM Ramp Valley
PWM Ramp Amplitude
COMP Shutdown Resistance
VDD = 2.4V to 3.6V
From COMP to GND, VEN = 0V
830
1
8
UNITS
V
mA
mA
mA
µA
V
µs
µA
ns
V
V
V/µs
mV
V
2 _______________________________________________________________________________________


Part Number MAX15040
Description Step-Down Regulator
Maker Maxim Integrated Products
PDF Download

MAX15040 Datasheet PDF






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