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PDF MAX15038 Data sheet ( Hoja de datos )

Número de pieza MAX15038
Descripción 2MHz Step-Down Regulator
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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19-4320; Rev 1; 12/09
EVAALVUAAILTAIOBNLEKIT
4A, 2MHz Step-Down Regulator
with Integrated Switches
General Description
The MAX15038 high-efficiency switching regulator
delivers up to 4A load current at output voltages from
0.6V to 90% of VIN. 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
Pin Configuration appears at end of data sheet.
Features
o Internal 31mRDS(ON) High-Side and 24m
RDS(ON) Low-Side MOSFETs
o Continuous 4A Output Current Over Temperature
o ±1% Output Accuracy Over Load, Line, and
Temperature
o Operates from 2.9V to 5.5V VIN Supply
o Adjustable Output from 0.6V to (0.9 x VIN)
o Soft-Start Reduces Inrush Supply Current
o 500kHz to 2MHz Adjustable Switching Frequency
o Compatible with Ceramic, Polymer, and
Electrolytic Output Capacitors
o 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
o Monotonic Startup for Safe-Start into Prebiased
Outputs
o Selectable Forced PWM or Skip Mode for Light
Load Efficiency
o Overcurrent and Overtemperature Protection
o Output Current Sink/Source Capable with Cycle-
by-Cycle Protection
o Open-Drain Power-Good Output
o Lead-Free, 4mm x 4mm, 24-Pin Thin QFN Package
Ordering Information
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.
Typical Operating Circuit
INPUT
2.9V TO 5.5V
IN BST
MAX15038
EN
LX
VDD
OUT
OUTPUT
1.8V, 4A
CTL2
CTL1
FREQ
REFIN
SS
PGND
FB
COMP
VDD
MODE
PWRGD
GND
________________________________________________________________ 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.
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MAX15038 pdf
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4A, 2MHz Step-Down Regulator
with Integrated Switches
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VEN = 5V, CVDD = 2.2µF, TA = TJ = -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 UNITS
FB Hiccup Threshold
VFB falling
Hiccup Threshold Blanking Time VFB falling
70 %
VREFIN
28 µs
Note 3: Specifications are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
Typical Operating Characteristics
(Typical values are VIN = VEN = 5V, VOUT = 1.8V, RFREQ = 49.9k, IOUT = 4A, TA = +25°C, circuit of Figure 1, unless otherwise noted.)
EFFICIENCY
vs. OUTPUT CURRENT
100
90
80
70
60
50
40
0.1
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
1.0
OUTPUT CURRENT (A)
PWM
SKIP
10.0
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
2.5
FREQUENCY
vs. INPUT VOLTAGE
TA = +85°C
TA = +25°C
TA = -40°C
RFREQ = 49.9k
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
EFFICIENCY
vs. OUTPUT CURRENT
100
90
80 VOUT = 2.5V
70 VOUT = 1.8V
60 VOUT = 1.2V
50
VIN = 3.3V
40
0.1
1.0
OUTPUT CURRENT (A)
PWM
SKIP
10.0
LOAD REGULATION
0
-0.05
-0.10
-0.15
-0.20
-0.25 VOUT = 1.2V
-0.30 VOUT = 1.8V
-0.35 VOUT = 2.5V
-0.40
-0.45
-0.50
0
123
LOAD CURRENT (A)
4
2.20
2.15
2.10
2.05
2.00
1.95
1.90
1.85
1.80
2.5
FREQUENCY
vs. INPUT VOLTAGE
TA = +85°C
TA = +25°C
TA = -40°C
RFREQ = 23.2k
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
LINE REGULATION (LOAD = 4A)
0
VOUT = 2.5V
-0.02
-0.04
VOUT = 1.8V
-0.06
-0.08
-0.10
VOUT = 1.2V
-0.12
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
_______________________________________________________________________________________ 5
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MAX15038 arduino
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4A, 2MHz Step-Down Regulator
with Integrated Switches
Typical Application Circuit
INPUT
2.9V TO 5.5V
C6 C7
22µF 0.1µF
C5
2.2µF
R4
49.9k
IN BST
MAX15038
LX
VDD
OUT
CTL2
CTL1
EN
FREQ
REFIN
C4
0.022µF
SS
PGND
FB
COMP
MODE
PWRGD
GND
C10
0.1µF
2.2
L1
0.47µH
OPTIONAL
C15
1000pF
OUTPUT
1.8V, 4A
C3
560pF
R3
158
C8 C9
22µF 0.01µF
C2
1500pF
R2
2.67k
C1
33pF
VDD
R1
20k
Figure 1. 1MHz, All-Ceramic-Capacitor Design with VIN = 2.9V to 5.5V and VOUT = 1.8V
Detailed Description
The MAX15038 high-efficiency, voltage-mode switching
regulator delivers up to 4A of output current. The
MAX15038 provides output voltages from 0.6V to 0.9 x
VIN from 2.9V to 5.5V input supplies, making it ideal for
on-board point-of-load applications. The output voltage
accuracy is better than ±1% over load, line, and tem-
perature.
The MAX15038 features a wide switching frequency
range, allowing the user to achieve all-ceramic-capaci-
tor designs and fast transient responses (see Figure 1).
The high operating frequency minimizes the size of
external components. The MAX15038 is available in a
small (4mm x 4mm), lead-free, 24-pin thin QFN pack-
age. The REFIN function makes the MAX15038 an ideal
candidate for DDR and tracking power supplies. Using
internal low-RDS(ON) (24mfor the low-side n-channel
MOSFET and 31mfor the high-side n-channel
MOSFET) maintains high efficiency at both heavy-load
and high-switching frequencies.
The MAX15038 employs voltage-mode control architec-
ture with a high bandwidth (28MHz) error amplifier. The
voltage-mode control architecture allows up to 2MHz
switching frequency, reducing board area. The op-amp
voltage-error amplifier works with type III compensation
to fully utilize the bandwidth of the high-frequency
switching to obtain fast transient response. Adjustable
soft-start time provides flexibilities to minimize input
startup inrush current. An open-drain, power-good
(PWRGD) output goes high when VFB reaches 92.5% of
VREFIN and VREFIN is greater than 0.54V.
The MAX15038 provides option for three modes of oper-
ation: regular PWM, PWM mode with monotonic startup
into prebiased output, or skip mode with monotonic
startup into prebiased output.
______________________________________________________________________________________ 11
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