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MAX1858A-MAX1876A

更新时间： 2024-09-14 22:38:35
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
22页 551K
描述
Dual 180∑ Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR

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MAX1858A-MAX1876A 数据手册

 浏览型号MAX1858A-MAX1876A的Datasheet PDF文件第2页浏览型号MAX1858A-MAX1876A的Datasheet PDF文件第3页浏览型号MAX1858A-MAX1876A的Datasheet PDF文件第4页浏览型号MAX1858A-MAX1876A的Datasheet PDF文件第5页浏览型号MAX1858A-MAX1876A的Datasheet PDF文件第6页浏览型号MAX1858A-MAX1876A的Datasheet PDF文件第7页 
19-2966; Rev 0; 10/03  
Dual 180° Out-of-Phase Buck Controllers with  
Sequencing/Prebias Startup and POR  
General Description  
Features  
The MAX1858A/MAX1875A/MAX1876A dual, synchro-  
nized, step-down controllers generate two outputs from  
input supplies ranging from 4.5V to 23V. Each output is  
adjustable from sub-1V to 18V and supports loads of 10A  
or higher. Input voltage ripple and total RMS input ripple  
current are reduced by synchronized 180° out-of-phase  
operation.  
o 4.5V to 23V Input Supply Range  
o 0 to 18V Output Voltage Range (Up to 10A)  
o Adjustable Lossless Foldback Current Limit  
o Adjustable 100kHz to 600kHz Switching  
Frequency  
The switching frequency is adjustable from 100kHz to  
600kHz with an external resistor. Alternatively, the con-  
troller can be synchronized to an external clock gener-  
ated by another MAX1858A/MAX1875A/MAX1876A or a  
system clock. One MAX1858A/MAX1875A/MAX1876A  
can be set to generate an in-phase, or 90° out-of-  
phase, clock signal for synchronization with additional  
controllers. This allows two controllers to operate either  
as an interleaved two- or four-phase system with each  
output shifted by 90°. The MAX1858A/MAX1875A/  
MAX1876A feature soft-start. The MAX1858A also fea-  
tures first-on/last-off power sequencing and soft-stop.  
o Optional Synchronization  
o Clock Output for Master/Slave Synchronization  
o 4 x 90° Out-of-Phase Step-Down Converters  
(Using Two Controllers, Figure 7)  
o Prebias Startup (MAX1875A/MAX1876A)  
o Power Sequencing (MAX1858A)  
o RST Output with 140ms Minimum Delay  
(MAX1858A/MAX1876A)  
o Fixed-Frequency Pulse-Width Modulation (PWM)  
The MAX1858A/MAX1875A/MAX1876A eliminate the  
need for current-sense resistors by utilizing the low-side  
MOSFET’s on-resistance as a current-sense element.  
This protects the DC-DC components from damage dur-  
ing output-overload conditions or output short-circuit  
faults without requiring a current-sense resistor.  
Adjustable foldback current limit reduces power dissipa-  
tion during short-circuit conditions. The MAX1858A/  
MAX1876A include a power-on reset (POR) output to sig-  
nal the system when both outputs reach regulation.  
Operation  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
24 QSOP  
MAX1858AEEG  
MAX1875AEEG  
MAX1876AEEG  
24 QSOP  
24 QSOP  
The MAX1858A/MAX1875A/MAX1876A ensure that the  
output voltage does not swing negative when the input  
power is removed or when EN is driven low. The  
MAX1875A/MAX1876A also allow prebias startup with-  
out discharging the output.  
Pin Configuration  
TOP VIEW  
COMP2  
1
2
3
4
5
6
7
8
9
24 EN  
The MAX1858A/MAX1875A/MAX1876A are available in a  
24-pin QSOP package. Use the MAX1875 evaluation kit  
or the MAX1858 evaluation kit to evaluate the  
MAX1858A/MAX1875A/MAX1876A.  
FB2  
ILIM2  
OSC  
V+  
23 DH2  
22  
LX2  
21 BST2  
20 DL2  
Applications  
MAX1858A  
MAX1875A  
MAX1876A  
REF  
19 V  
L
Network Power Supplies  
GND  
CKO  
SYNC  
18 PGND  
17 DL1  
Telecom Power Supplies  
DSP, ASIC, and FPGA Power Supplies  
Set-Top Boxes  
16 BST1  
ILIM1 10  
FB1 11  
15  
14  
LX1  
Broadband Routers  
Servers  
DH1  
COMP1 12  
13 RST (N.C.)  
() ARE FOR THE MAX1875A ONLY  
Desknote Computers  
QSOP  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...22

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