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MAX15038ETG+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
General Description
The MAX15038 high-efficiency switching regulator
delivers up to 4A load current at output voltages from
0.6V to 90% of V
IN
. The IC operates from 2.9V to 5.5V,
making it ideal for on-board point-of-load and postregu-
lation applications. Total output error is less than ±1%
over load, line, and temperature ranges.
The MAX15038 features fixed-frequency PWM mode
operation with a switching frequency range of 500kHz
to 2MHz set by an external resistor. The MAX15038
provides the option of operating in a skip mode to
improve light-load efficiency. High-frequency operation
allows for an all-ceramic capacitor design. The high
operating frequency also allows for small-size external
components.
The low-resistance on-chip nMOS switches ensure high
efficiency at heavy loads while minimizing critical induc-
tances, 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 MAX15038 comes with a high bandwidth (28MHz)
voltage-error amplifier. The voltage-mode control archi-
tecture and the voltage-error amplifier permit a type III
compensation scheme to be utilized to achieve maxi-
mum loop bandwidth, up to 20% of the switching fre-
quency. High loop bandwidth provides fast transient
response, resulting in less required output capacitance
and allowing for all-ceramic-capacitor designs.
The MAX15038 provides two three-state logic inputs to
select one of nine preset output voltages. The preset
output voltages allow customers to achieve ±1% out-
put-voltage accuracy without using expensive 0.1%
resistors. In addition, the output voltage can be set to
any customer value by either using two external resis-
tors at the feedback with a 0.6V internal reference or
applying an external reference voltage to the REFIN
input. The MAX15038 offers programmable soft-start
time using one capacitor to reduce input inrush current.
Applications
Server Power Supplies
POLs
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
♦ Internal 31mΩ R
DS(ON)
High-Side and 24mΩ
R
DS(ON)
Low-Side MOSFETs
♦ Continuous 4A Output Current Over Temperature
♦ ±1% Output Accuracy Over Load, Line, and
Temperature
♦ Operates from 2.9V to 5.5V V
IN
Supply
♦ Adjustable Output from 0.6V to (0.9 x V
IN
)
♦ Soft-Start Reduces Inrush Supply Current
♦ 500kHz to 2MHz Adjustable Switching Frequency
♦ Compatible with Ceramic, Polymer, and
Electrolytic Output Capacitors
♦ Nine Preset and Adjustable Output Voltages
0.6V, 0.7V, 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.0V,
2.5V, and Adjustable
♦ Monotonic Startup for Safe-Start into Prebiased
Outputs
♦ Selectable Forced PWM or Skip Mode for Light
Load Efficiency
♦ Overcurrent and Overtemperature Protection
♦ Output Current Sink/Source Capable with Cycle-
by-Cycle Protection
♦ Open-Drain Power-Good Output
♦ Lead-Free, 4mm x 4mm, 24-Pin Thin QFN Package
MAX15038
4A, 2MHz Step-Down Regulator
with Integrated Switches
________________________________________________________________
Maxim Integrated Products
1
OUTPUT
1.8V, 4A
INPUT
2.9V TO 5.5V
BST
LX
OUT
IN
EN
V
DD
CTL2
CTL1
PGND
FB
V
DD
COMP
PWRGD
FREQ
REFIN
SS
GND
MODE
MAX15038
Typical Operating Circuit
Ordering Information
19-4320; Rev 3; 12/10
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.
PART TEMP RANGE PIN-PACKAGE
MAX15038ETG+ -40°C to +85°C 24 Thin QFN-EP*
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
Pin Configuration appears at end of data sheet.
EVALUATION KIT
AVAILABLE
MAX15038
4A, 2MHz Step-Down Regulator
with Integrated Switches
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
EN
= 5V, C
VDD
= 2.2μF, T
A
= T
J
= -40°C to +85°C, typical values are at T
A
= +25°C, circuit of Figure 1, unless otherwise
noted.) (Note 3)
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.
IN, PWRGD to GND..................................................-0.3V to +6V
V
DD
to GND..................-0.3V to the lower of +4V or (V
IN
+ 0.3V)
COMP, FB, MODE, REFIN, CTL1, CTL2, SS,
FREQ to GND ..........................................-0.3V to (V
DD
+ 0.3V)
OUT, EN to GND ......................................................-0.3V to +6V
BST to LX..................................................................-0.3V to +6V
BST to GND ............................................................-0.3V to +12V
PGND to GND .......................................................-0.3V to +0.3V
LX to PGND ..................-0.3V to the lower of +6V or (V
IN
+ 0.3V)
LX to PGND ..........-1V to the lower of +6V or (V
IN
+ 1V) for 50ns
I
LX(RMS)
(Note 1) ......................................................................4A
V
DD
Output Short-Circuit Duration .............................Continuous
Converter Output Short-Circuit Duration ....................Continuous
Continuous Power Dissipation (T
A
= +70°C)
24-Pin TQFN (derate 27.8mW/°C above +70°C) ........2222mW
Thermal Resistance (Note 2)
θ
JA
.................................................................................36°C/W
θ
JC
..................................................................................6°C/W
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 limits.
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
.
PARAMETER CONDITIONS MIN TYP MAX UNITS
IN
IN Voltage Range 2.9 5.5 V
V
IN
= 3.3V 4.7 8
IN Supply Current f
S
= 1MHz, no load
V
IN
= 5V 5 8.5
mA
V
IN
= 5V, V
EN
= 0V 10 20
Total Shutdown Current from IN
V
IN
= V
DD
= 3.3V, V
EN
= 0V 45
μA
3.3V LDO (V
DD
)
V
DD
rising 2.6 2.8
V
DD
falling 2.35 2.55
V
V
DD
Undervoltage Lockout
Threshold
LX starts/stops switching
Minimum glitch-width
rejection
10 μs
V
DD
Output Voltage V
IN
= 5V, I
VDD
= 0 to 10mA 3.1 3.3 3.5 V
V
DD
Dropout V
IN
= 2.9V, I
VDD
= 10mA 0.08 V
V
DD
Current Limit V
IN
= 5V, V
DD
= 0V 25 40 mA
BST
BST Supply Current V
BST
= V
IN
= 5V, V
LX
= 0 or 5V, V
EN
= 0V 0.025 μA
PWM COMPARATOR
PWM Comparator Propagation
Delay
10mV overdrive 20 ns
PWM Peak-to-Peak Ramp
Amplitude
1V
PWM Valley Amplitude 0.8 V
MAX15038
4A, 2MHz Step-Down Regulator
with Integrated Switches
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
EN
= 5V, C
VDD
= 2.2μF, T
A
= T
J
= -40°C to +85°C, typical values are at T
A
= +25°C, circuit of Figure 1, unless otherwise
noted.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
ERROR AMPLIFIER
COMP Clamp Voltage, High V
IN
= 2.9V to 5V, V
FB
= 0.5V, V
REFIN
= 0.6V 2 V
COMP Clamp Voltage, Low V
IN
= 2.9V to 5V, V
FB
= 0.7V, V
REFIN
= 0.6V 0.7 V
COMP Slew Rate V
FB
step from 0.5V to 0.7V in 10ns 1.6 V/μs
COMP Shutdown Resistance
From COMP to GND, V
IN
= 3.3V, V
COMP
= 100mV,
V
EN
= V
SS
= 0V
6 Ω
Internally Preset Output Voltage
Accuracy
V
REFIN
= V
SS
, MODE = GND -1 +1 %
FB Set Point Value CTL1 = CTL2 = GND, MODE = GND 0.594 0.6 0.606 V
FB to OUT Resistor All VID settings except CTL1 = CTL2 = GND 5.5 8 10.5 kΩ
Open-Loop Voltage Gain 115 dB
Error-Amplifier Unity-Gain
Bandwidth
28 MHz
Error-Amplifier and REFIN
Common-Mode Input Range
V
DD
= 2.9V to 3.5V 0 V
DD
- 2 V
V
FB
= 0.7V, sinking 1
Error-Amplifier Maximum Output
Current
V
COMP
= 1V,
V
REFIN
= 0.6V
V
FB
= 0.5V, sourcing -1
mA
FB Input Bias Current CTL1 = CTL2 = GND -125 nA
CTL_
V
CTL_
= 0V -7.2
CTL_ Input Bias Current
V
CTL_
= V
DD
+7.2
μA
Low, falling 0.8
Open V
DD
/2
CTL_ Input Threshold
High, rising
V
DD
-
0.8
V
Hysteresis All VID transitions 50 mV
REFIN
REFIN Input Bias Current V
REFIN
= 0.6V -185 nA
REFIN Offset Voltage V
REFIN
= 0.9V, FB shorted to COMP -4.5 +4.5 mV
LX (All Pins Combined)
V
IN
= V
BST
- V
LX
= 3.3V 42
LX On-Resistance, High-Side I
LX
= -2A
V
IN
= V
BST
- V
LX
= 5V 31 54
mΩ
V
IN
= 3.3V 30
LX On-Resistance, Low-Side I
LX
= 2A
V
IN
= 5V 24 42
mΩ
High-side sourcing 5.7 7
Low-side sinking 7LX Current-Limit Threshold
Zero-crossing current threshold, MODE = V
DD
0.2
A
V
LX
= 0V -0.01
LX Leakage Current V
IN
= 5V, V
EN
= 0V
V
LX
= 5V +0.01
μA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MAX15038ETG+

Mfr. #:
Buy MAX15038ETG+
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 4A 2MHz Step-Down w/Integrated Switch
Lifecycle:
New from this manufacturer.
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