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MAX15038

更新时间： 2024-11-14 11:18:31
品牌 Logo 应用领域
美信 - MAXIM 稳压器开关
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19页 360K
描述
4A, 2MHz Step-Down Regulator with Integrated Switches

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MAX15038 数据手册

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19-4320; Rev 1; 12/09  
4A, 2MHz Step-Down Regulator  
with Integrated Switches  
MAX15038  
General Description  
Features  
o Internal 31mΩ R  
High-Side and 24mΩ  
The MAX15038 high-efficiency switching regulator  
delivers up to 4A load current at output voltages from  
DS(ON)  
R
Low-Side MOSFETs  
DS(ON)  
o Continuous 4A Output Current Over Temperature  
0.6V to 90% of V . The IC operates from 2.9V to 5.5V,  
IN  
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.  
o
1ꢀ Output Aꢁꢁuraꢁc Over Loadꢂ Lineꢂ and  
Temperature  
o Operates from 2.9V to 5.5V V Supplc  
IN  
o Adjustable Output from 0.6V to (0.9 x V )  
IN  
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.  
o Soft-Start Reduꢁes Inrush Supplc Current  
o 500kHz to 2MHz Adjustable Switꢁhing Frequenꢁc  
o Compatible with Ceramiꢁꢂ Polcmerꢂ and  
Eleꢁtrolctiꢁ Output Capaꢁitors  
o Nine Preset and Adjustable Output Voltages  
0.6Vꢂ 0.7Vꢂ 0.8Vꢂ 1.0Vꢂ 1.2Vꢂ 1.5Vꢂ 1.8Vꢂ 2.0Vꢂ  
2.5Vꢂ and Adjustable  
o Monotoniꢁ Startup for Safe-Start into Prebiased  
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.  
Outputs  
o Seleꢁtable Forꢁed PWM or Skip Mode for Light  
Load Effiꢁienꢁc  
o Overꢁurrent and Overtemperature Proteꢁtion  
o Output Current Sink/Sourꢁe Capable with Ccꢁle-  
bc-Ccꢁle Proteꢁtion  
o Open-Drain Power-Good Output  
o Lead-Freeꢂ 4mm x 4mmꢂ 24-Pin Thin QFN Paꢁkage  
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.  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX15038ETG+  
-40°C to +85°C  
24 Thin QFN-EP*  
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.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
*EP = Exposed pad.  
Typical Operating Circuit  
INPUT  
2.9V TO 5.5V  
IN  
BST  
OUTPUT  
1.8V, 4A  
MAX15038  
EN  
LX  
V
DD  
OUT  
Applications  
PGND  
FB  
Server Power Supplies  
POLs  
CTL2  
CTL1  
FREQ  
ASIC/CPU/DSP Core and I/O Voltages  
DDR Power Supplies  
Base-Station Power Supplies  
Telecom and Networking Power Supplies  
RAID Control Power Supplies  
REFIN  
SS  
V
DD  
COMP  
MODE  
PWRGD  
GND  
Pin Configuration appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Produꢁts  
1
For priꢁingꢂ delivercꢂ and ordering informationꢂ please ꢁontaꢁt Maxim Direꢁt at 1-888-629-4642ꢂ  
or visit Maxim’s website at www.maxim-iꢁ.ꢁom.  
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