參數(shù)資料
型號： MAX8545
廠商： Maxim Integrated Products, Inc.
英文描述： Low-Cost. Wide Input Range. Step-Down Controllers with Foldback Current Limit
中文描述： 低成本、寬輸入范圍、降壓型控制器，帶有折返式限流
文件頁數(shù)： 1/18頁
文件大?。?/td> 343K
代理商： MAX8545
General Description
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.
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
IN
. These devices can provide effi-
ciency up to 95%. Lossless short-circuit and current-limit
protection is provided by monitoring the R
DS(ON)
of the
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.
The MAX8545/MAX8546 operate at 300kHz and the
MAX8548 operates at 100kHz. The MAX8545/
MAX8546/MAX8548 are compatible with low-cost alu-
minum electrolytic capacitors. Input undervoltage lock-
out prevents proper operation under power-sag
operations to prevent external MOSFETs from overheat-
ing. Internal soft-start is included to reduce inrush cur-
rent. These devices are offered in space-saving 10-pin
μMAX packages.
Applications
Notebook Docking
Station Supplies
Cable Modems and
Routers
Networking Power
Supplies
Features
o
2.7V to 28V Input Range
o
Foldback Short-Circuit Protection
o
No Additional Bias Supply Needed
o
0.8V to 0.83 x V
IN
Output
o
Up to 95% Efficiency
o
Low-Cost External Components
o
No Current-Sense Resistor
o
All N-Channel MOSFET Design
o
Adaptive Gate Drivers Eliminate Shoot-Through
o
Lossless Overcurrent and Short-Circuit
Protection
o
300kHz Switching Frequency
(MAX8545/MAX8546)
o
100kHz Switching Frequency (MAX8548)
o
Pin-Compatible with the MAX1967
o
Thermal Shutdown
M
Low-Cost, Wide Input Range, Step-Down
Controllers with Foldback Current Limit
________________________________________________________________
Maxim Integrated Products
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.
1
MAX8545
MAX8546
MAX8548
ON
OFF
OPTIONAL
BST
DH
V
IN
COMP/
EN
VL
V
CC
LX
DL
GND
FB
INPUT
2.7V TO 28V
OUTPUT
0.8V TO
0.9 x V
IN
UP TO 6A
Typical Operating Circuit
Ordering Information
Pin Configuration appears at end of data sheet.
19-2795; Rev 0; 7/03
PART
TEMP RANGE
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
PIN-PACKAGE
10 μMAX
10 μMAX
10 μMAX
MAX8545
EUB
MAX8546
EUB
MAX8548
EUB
Selector Guide
PART
SWITCHING
FREQUENCY
CURRENT-LIMIT
THRESHOLD
MAX8545
MAX8546
MAX8548
300kHz
300kHz
100kHz
-320mV
-165mV
-320mV
Set-Top Boxes
Graphic Card and Video
Supplies
Desktops and Desknotes
PCI Express Power
Supplies
Telecom Power Supplies
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MAX8545EUB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX8545EUB+ 功能描述:電壓模式 PWM 控制器 Wide Input Range Step-Down Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX8545EUB+T 功能描述:電壓模式 PWM 控制器 Wide Input Range Step-Down Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX8545EUB-T 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX8545EUB-TG069 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
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