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MAX8650

更新时间： 2024-11-21 11:14:35
品牌 Logo 应用领域
美信 - MAXIM 开关控制器
页数 文件大小 规格书
25页 364K
描述
4.5V to 28V Input Current-Mode Step-Down Controller with Adjustable Frequency

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MAX8650 数据手册

 浏览型号MAX8650的Datasheet PDF文件第2页浏览型号MAX8650的Datasheet PDF文件第3页浏览型号MAX8650的Datasheet PDF文件第4页浏览型号MAX8650的Datasheet PDF文件第5页浏览型号MAX8650的Datasheet PDF文件第6页浏览型号MAX8650的Datasheet PDF文件第7页 
19-3973; Rev 0; 1/06  
4.5V to 28V Input Current-Mode Step-  
Down Controller with Adjustable Frequency  
General Description  
Features  
The MAX8650 synchronous PWM buck controller oper-  
ates from a 4.5V to 28V input and generates an  
adjustable 0.7V to 5.5V output voltage at loads up to 25A.  
♦ Operates from 4.5V to 28V Supply  
♦ 1% FB Voltage Accuracy Over Temperature  
♦ Adjustable Output Voltage Down to 0.7V or REFIN  
The MAX8650 uses a peak current-mode control archi-  
tecture with an adjustable (200kHz to 1.2MHz) constant  
switching frequency and is externally synchronizable. The  
IC’s current limit uses the inductor’s DC resistance to  
improve efficiency or an external sense resistor for high  
accuracy. The current-limit threshold is adjusted with an  
external resistor. Foldback-type current limit can be  
implemented to reduce the power dissipation in overload  
or short-circuit conditions. Short-circuit protection is  
provided based on sensing the current in the low-side  
MOSFET. A reference input is provided for use with a  
high-accuracy external reference or for double-data-rate  
(DDR)-tracking applications.  
♦ Adjustable Switching Frequency or External  
Synchronization from 200kHz to 1.2MHz  
♦ 180° Phase-Shifted Clock Output  
♦ Adjustable Overcurrent Limit  
♦ Adjustable Foldback Current Limit  
♦ Adjustable Slope Compensation  
♦ Selectable Current-Limit Mode: Latch-Off or  
Automatic Recovery  
♦ Monotonic Output-Voltage Rise at Startup  
♦ Output Sources and Sinks Current  
♦ Enable Input  
Monotonic prebiased startup is available for a safe-start  
in applications where the output capacitor may have an  
initial charge. This feature prevents the output from  
pulling low during startup, which is a common charac-  
teristic of conventional buck regulators.  
♦ Power-OK (POK) Output  
A 180° out-of–phase synchronization output is available  
♦ Adjustable Soft-Start  
for synchronizing with another converter.  
♦ Independently Adjustable Overvoltage Protection  
Applications  
Ordering Information  
Base Stations  
DDR  
PKG  
CODE  
Network and Telecom Power Modules  
PART  
TEMP RANGE PIN-PACKAGE  
Storage  
Servers  
IBA Applications  
24 QSOP  
MAX8650EEG+ -40°C to +85°C  
E24-1  
+Denotes lead-free package.  
Pin Configuration appears at end of data sheet.  
Typical Operating Circuit  
R2  
R1  
V
IN  
7V TO 28V  
SYNC  
1
2
FSYNC  
MODE  
BST  
C1  
D2  
EN  
4
5
ON  
OFF  
11  
24  
3
EN  
POK  
V
OUT  
0.7V TO 5.5V  
POK  
DH  
L1  
SYNCO  
C2  
6
7
Q1  
SYNCO  
SCOMP  
LX  
DL  
MAX8650EEG  
23  
C5  
R8  
R3  
C3  
C6  
22  
21  
Q2  
8
ILIM2  
REFIN  
PGND  
VL  
C7  
9
20  
16  
SS  
10  
C8  
IN  
R4  
C10  
C9  
R9  
ILIM1  
12  
14  
AVL  
C4  
R6  
R5  
19  
18  
COMP  
FB  
CS+  
15 C11  
13  
R7  
CS-  
17  
OVP  
GND  
________________________________________________________________ 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...25

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