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MAX1957

更新时间： 2024-11-10 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
22页 436K
描述
低成本、高频、电流模式PWM buck控制器

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MAX1957 数据手册

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19-2373; Rev 0; 4/02  
Low-Cost, High-Frequency, Current-Mode PWM  
Buck Controller  
General Description  
Features  
The MAX1953/MAX1954/MAX1957 is a family of versa-  
tile, economical, synchronous current-mode, pulse-width  
modulation (PWM) buck controllers. These step-down  
controllers are targeted for applications where cost and  
size are critical.  
♦ Low-Cost Current-Mode Controllers  
♦ Fixed-Frequency PWM  
♦ MAX1953  
1MHz Switching Frequency  
Small Component Size, Low Cost  
Adjustable Current Limit  
The MAX1953 operates at a fixed 1MHz switching fre-  
quency, thus significantly reducing external component  
size and cost. Additionally, excellent transient response  
is obtained using less output capacitance. The MAX1953  
operates from low 3V to 5.5V input voltage and can sup-  
ply up to 10A of output current. Selectable current limit is  
provided to tailor to the external MOSFETs’ on-resistance  
for optimum cost and performance. The output voltage is  
♦ MAX1954  
3V to 13.2V Input Voltage  
25A Output Current Capability  
93% Efficiency  
300kHz Switching Frequency  
adjustable from 0.8V to 0.86V .  
IN  
♦ MAX1957  
With the MAX1954, the drain-voltage range on the high-  
side FET is 3V to 13.2V and is independent of the supply  
voltage. It operates at a fixed 300kHz switching frequen-  
cy and can be used to provide up to 25A of output cur-  
rent with high efficiency. The output voltage is adjustable  
Tracking 0.4V to 0.86V Output Voltage Range  
IN  
Sinking and Sourcing Capability of 3A  
♦ Shutdown Feature  
♦ All N-Channel MOSFET Design for Low Cost  
♦ No Current-Sense Resistor Needed  
♦ Internal Digital Soft-Start  
from 0.8V to 0.86V  
.
HSD  
The MAX1957 features a tracking output voltage range of  
0.4V to 0.86V and is capable of sourcing or sinking  
IN  
current for applications such as DDR bus termination  
and PowerPC™/ASIC/DSP core supplies. The MAX1957  
operates from a 3V to 5.5V input voltage and at a fixed  
300kHz switching frequency.  
♦ Thermal Overload Protection  
♦ Small 10-Pin µMAX Package  
Ordering Information  
The MAX1953/MAX1954/MAX1957 provide a COMP pin  
that can be pulled low to shut down the converter in  
addition to providing compensation to the error amplifier.  
An input undervoltage lockout (ULVO) is provided to  
ensure proper operation under power-sag conditions to  
prevent the external power MOSFETs from overheating.  
Internal digital soft-start is included to reduce inrush cur-  
rent. The MAX1953/MAX1954/MAX1957 are available in  
tiny 10-pin µMAX packages.  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
10 µMAX  
MAX1953EUB  
MAX1954EUB  
MAX1957EUB  
10 µMAX  
10 µMAX  
Pin Configurations  
TOP VIEW  
Applications  
Printers and Scanners  
ILIM  
1
2
3
4
5
10 BST  
Graphic Cards and Video Cards  
PCs and Servers  
COMP  
FB  
9
8
7
6
LX  
MAX1953EUB  
DH  
Microprocessor Core Supply  
Low-Voltage Distributed Power  
Telecommunications and Networking  
GND  
IN  
PGND  
DL  
µMAX  
PowerPC is a trademark of Motorola, Inc.  
Pin Configurations continued at end of data sheet.  
________________________________________________________________ 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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