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    參數(shù)資料
    型號(hào)： MAX8546
    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(yè)數(shù)： 1/18頁(yè)
    文件大小： 343K
    代理商： MAX8546
    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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    相關(guān)代理商/技術(shù)參數(shù)
    參數(shù)描述
    MAX8546EUB 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
    MAX8546EUB+ 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(kāi)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
    MAX8546EUB+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(kāi)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
    MAX8546EUB-T 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
    MAX8546EVKIT 功能描述:電源管理IC開(kāi)發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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