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MAX8545_07

更新时间： 2024-10-01 04:41:39
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
18页 305K
描述
Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit

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MAX8545_07 数据手册

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19-2795; Rev 2; 6/07  
Low-Cost, Wide Input Range, Step-Down  
Controllers with Foldback Current Limit  
General Description  
Features  
The MAX8545/MAX8546/MAX8548 are voltage-mode  
pulse-width-modulated (PWM), step-down DC-DC con-  
trollers ideal for a variety of cost-sensitive applications.  
They drive low-cost n-channel MOSFETs for both the  
high-side switch and synchronous rectifier, and require  
no external current-sense resistor. These devices can  
supply output voltages as low as 0.8V.  
♦ 2.7V to 28V Input Range  
♦ Foldback Short-Circuit Protection  
♦ No Additional Bias Supply Needed  
♦ 0.8V to 0.83 x V Output  
IN  
♦ Up to 95% Efficiency  
♦ Low-Cost External Components  
♦ No Current-Sense Resistor  
♦ All n-Channel MOSFET Design  
The MAX8545/MAX8546/MAX8548 have a wide 2.7V to  
28V input range, and do not need any additional bias  
voltage. The output voltage can be precisely regulated  
from 0.8V to 0.83 x V . These devices can provide effi-  
IN  
♦ Adaptive Gate Drivers Eliminate Shoot-Through  
ciency up to 95%. Lossless short-circuit and current-limit  
protection is provided by monitoring the R  
of the  
DS(ON)  
♦ Lossless Overcurrent and Short-Circuit  
Protection  
low-side MOSFET. The MAX8545 and MAX8548 have a  
current-limit threshold of 320mV, while the MAX8546 has  
a current-limit threshold of 165mV. All devices feature  
foldback-current capability to minimize power dissipation  
under short-circuit condition. Pulling the COMP/EN pin  
low with an open-collector or low-capacitance, open-  
drain device can shut down all devices.  
♦ 300kHz Switching Frequency  
(MAX8545/MAX8546)  
♦ 100kHz Switching Frequency (MAX8548)  
♦ Pin-Compatible with the MAX1967  
♦ Thermal Shutdown  
The MAX8545/MAX8546 operate at 300kHz and the  
MAX8548 operates at 100kHz. The MAX8545/MAX8546/  
MAX8548 are compatible with low-cost aluminum elec-  
trolytic capacitors. Input undervoltage lockout prevents  
proper operation under power-sag operations to prevent  
external MOSFETs from overheating. Internal soft-start is  
included to reduce inrush current. These devices are  
Selector Guide  
SWITCHING  
FREQUENCY  
(kHz)  
CURRENT-LIMIT  
THRESHOLD  
(mV)  
PART  
MAX8545  
300  
300  
100  
-320  
-165  
-320  
®
offered in space-saving 10-pin µMAX packages.  
MAX8546  
MAX8548  
Applications  
Set-Top Boxes  
Graphic Card and Video  
Supplies  
Notebook Docking  
Station Supplies  
Typical Operating Circuit  
Cable Modems and  
Routers  
INPUT  
2.7V TO 28V  
Desktops and Desknotes  
Networking Power  
Supplies  
PCI Express Power  
Supplies  
V
VL  
CC  
Telecom Power Supplies  
OUTPUT  
0.8V TO  
V
IN  
BST  
DH  
Ordering Information  
0.9 x V  
IN  
UP TO 6A  
PIN-  
PKG  
LX  
DL  
MAX8545  
MAX8546  
MAX8548  
PART  
TEMP RANGE  
PACKAGE  
CODE  
10 µMAX  
10 µMAX  
10 µMAX  
10 µMAX  
10 µMAX  
10 µMAX  
MAX8545EUB  
MAX8545EUB+  
MAX8546EUB  
MAX8546EUB+  
MAX8548EUB  
MAX8548EUB+  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
U10-2  
U10-2  
U10-2  
U10-2  
U10-2  
U10-2  
GND  
COMP/  
EN  
OFF  
FB  
ON  
OPTIONAL  
+Denotes a lead-free package.  
µMAX is a registered trademark of Maxim Integrated Products, Inc.  
Pin Configuration appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
1234567...18

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MAX8545EUB MAXIM

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MAX8545EUB+ MAXIM

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MAX8545EUB+T MAXIM

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MAX8546 MAXIM

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 		Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit
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 		低成本、宽输入范围、降压型控制器，带有折返式限流
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 		PLASTIC ENCAPSULATED DEVICES
MAX8546EUB+ MAXIM

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 		Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit
MAX8546EUB+T MAXIM

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 		Switching Controller, Voltage-mode, 360kHz Switching Freq-Max, BICMOS, PDSO10, MO-187C-BA,

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