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MAX8833_09

更新时间： 2024-09-12 11:14:31
品牌 Logo 应用领域
美信 - MAXIM 稳压器
页数 文件大小 规格书
20页 355K
描述
Dual, 3A, 2MHz Step-Down Regulator

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MAX8833_09 数据手册

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±9-0725; Rev 2; 4/09  
Dual, 3A, 2MHz Step-Down Regulator  
MAX83  
General Description  
Features  
o 35mΩ On-Resistance Internal MOSFETs  
The MAX8833 high-efficiency, dual step-down regulator  
is capable of delivering up to 3A at each output. The  
device operates from a 2.35V to 3.6V supply, and pro-  
o Dual, 3A, PWM Step-Down Regulators  
o Fully Protected Against Overcurrent,  
vides output voltages from 0.6V to 0.9 x V , making it  
IN  
Short Circuit, and Overtemperature  
ideal for on-board point-of-load applications. Total output  
error is less than ±±1 over load, line, and temperature.  
o ±±1 Output Accuracy over ꢀoad, ꢀine,  
and Temperature  
o Operates from 2.35V to 3.6V Supply  
The MAX8833 operates in PWM mode with a switching  
frequency ranging from 0.5MHz to 2MHz, set by an  
external resistor. It can also be synchronized to an  
external clock in the same frequency range. Two inter-  
nal switching regulators operate ±80° out-of-phase to  
reduce the input ripple current, and consequently  
reduce the required input capacitance. The high  
operating frequency minimizes the size of external  
components. High efficiency, internal dual-nMOS  
design keeps the board cool under heavy loads. The  
voltage-mode control architecture and the high-band-  
width (> ±5MHz typ) voltage-error amplifier allow a type  
III compensation scheme to be utilized to achieve fast  
response under both line and load transients, and also  
allow for ceramic output capacitors.  
o REFIN on One Channel for Tracking or  
External Reference  
o Integrated Boost Diodes  
o Adjustable Output from 0.6V to 0.9 x VIN  
o Soft-Start Reduces Inrush Supply Current  
o 0.5MHz to 2MHz Adjustable Switching,  
or FSYNC Input  
o All-Ceramic-Capacitor Design  
o ±80° Out-of-Phase Operation Reduces Input  
Ripple Current  
o Individual Enable Inputs and PWRGD Outputs  
o Safe-Start into Prebiased Output  
o Available in 5mm x 5mm Thin QFN Package  
o Sink/Source Current in DDR Applications  
Programmable soft-start reduces input inrush current.  
Two enable inputs allow the turning on/off of each out-  
put individually, resulting in great flexibility for system-  
level designs. A reference input is provided to facilitate  
output-voltage tracking applications. The MAX8833 is  
available in a 32-pin thin QFN (5mm x 5mm) package  
with 0.8mm max height.  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX8833ETJ+ -40°C to +85°C 32 Thin QFN (5mm x 5mm)  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Applications  
ASIC/CPU/DSP Power Supplies  
Typical Operating Circuit  
DDR Power Supplies  
INPUT2  
INPUT1  
Set-Top Box Power Supplies  
Printer Power Supplies  
Network Power Supplies  
2.35V TO 3.6V  
2.35V TO 3.6V  
IN1 IN2  
BST1  
BST2  
OUTPUT1  
1.2V / 3A  
OUTPUT2  
1.5V / 3A  
LX1  
LX2  
PGND1  
PGND2  
MAX8833  
FB2  
FB1  
COMP1  
COMP2  
TYPE III  
TYPE III  
COMPENSATION  
COMPENSATION  
PWRGD1 PWRGD2  
EN1 EN2  
ON  
ON  
GND  
OFF  
OFF  
Pin Configuration appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
±
For pricing, delivery, and ordering information, please contact Maxim Direct at ±-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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