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MAX15039_11

Description
6A, 2MHz Step-Down Regulator with Integrated Switches Open-Drain, Power-Good Output
File Size391KB,20 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX15039_11 Overview

6A, 2MHz Step-Down Regulator with Integrated Switches Open-Drain, Power-Good Output

19-4321; Rev 3; 12/10
KIT
ATION
EVALU
BLE
AVAILA
6A, 2MHz Step-Down Regulator
with Integrated Switches
General Description
Features
Internal 26mΩ R
DS(ON)
High-Side and 20mΩ
R
DS(ON)
Low-Side MOSFETs
Continuous 6A 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
MAX15039
The MAX15039 high-efficiency switching regulator
delivers up to 6A 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 MAX15039 features fixed-frequency PWM mode
operation with a switching frequency range of 500kHz
to 2MHz set by an external resistor. The MAX15039
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 MAX15039 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 MAX15039 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 MAX15039 offers programmable soft-start
time using one capacitor to reduce input inrush current.
Ordering Information
PART
MAX15039ETG+
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
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
EN
V
DD
MAX15039
LX
OUT
OUTPUT
1.8V, 6A
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
CTL2
CTL1
FREQ
REFIN
SS
PGND
FB
COMP
V
DD
MODE
GND
PWRGD
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.

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