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    參數(shù)資料
    

    


    


    
型號：
LT3580MPMS8E#TRPBF

    

    
廠商：
LINEAR TECHNOLOGY CORP

    

    
元件分類：
穩(wěn)壓器

    

    
英文描述：
2.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO8

    

    
封裝：
LEAD FREE, PLASTIC, MSOP-8

    

    
文件頁數(shù)：
26/28頁

    

    
文件大?。?/td>
289K

    

    
代理商：
LT3580MPMS8E#TRPBF


    

    

    

	
    
    
    

    
    
	
    LT3580
    7
    3580fg
    OPERATION
    Figure 1. SEPIC Topology Allows for the Input to Span
    the Output Voltage. Coupled or Uncoupled Inductors
    Can Be Used. Follow Noted Phasing if Coupled
    Figure 2. Dual Inductor Inverting Topology Results in
    Low Output Ripple. Coupled or Uncoupled Inductors
    Can Be Used. Follow Noted Phasing if Coupled
    D1
    SHUTDOWN
    L2
    C3
    L1
    R1
    VIN > VOUT
    OR
    VIN = VOUT
    OR
    VIN < VOUT
    VOUT
    VIN
    SW
    3580 F01
    LT3580
    RT
    RC
    C2
    SHDN
    GND
    FB
    VC
    SYNC
    SS
    RT
    CC
    CSS
    C1
    +
    D1
    SHUTDOWN
    C3
    L1
    R1
    VIN
    VOUT
    VIN
    SW
    3580 F02
    LT3580
    RT
    RC
    C2
    SHDN
    GND
    FB
    VC
    SYNC
    SS
    RT
    CC
    CSS
    C1
    L2
    +
    SEPIC Topology
    The LT3580 can be configured as a SEPIC (single-ended
    primary inductance converter). This topology allows for
    the input to be higher, equal, or lower then the desired
    output voltage. Output disconnect is inherently built into
    the SEPIC topology, meaning no DC path exists between the
    input and output. This is useful for applications requiring
    the output to be disconnected from the input source when
    the circuit is in shutdown.
    Inverting Topology
    The LT3580 can also work in a dual inductor inverting
    topology. The part’s unique feedback pin allows for the
    inverting topology to be built by simply changing the
    connection of external components. This solution results
    in very low output voltage ripple due to inductor L2 in
    series with the output. Abrupt changes in output capacitor
    current are eliminated because the output inductor deliv-
    ers current to the output during both the off-time and the
    on-time of the LT3580 switch.
    Start-Up Operation
    Several functions are provided to enable a very clean
    start-up for the LT3580.
     First, the SHDN pin voltage is monitored by an internal
    voltage reference to give a precise turn-on voltage level.
    An external resistor (or resistor divider) can be connected
    from the input power supply to the SHDN pin to provide
    a user-programmable undervoltage lockout function.
     Second, the soft-start circuitry provides for a gradual
    ramp-up of the switch current. When the part is brought
    out of shutdown, the external SS capacitor is first
    discharged (providing protection against SHDN pin
    glitches and slow ramping), then an integrated 275k
    resistor pulls the SS pin up to ~2.2V. By connecting an
    external capacitor to the SS pin, the voltage ramp rate
    on the pin can be set. Typical values for the soft-start
    capacitor range from 100nF to 1μF.
     Finally, the frequency foldback circuit reduces the
    switching frequency when the FB pin is in a nominal range
    of 350mV to 900mV. This feature reduces the minimum
    duty cycle that the part can achieve thus allowing better
    control of the switch current during start-up. When the
    FB voltage is pulled outside of this range, the switching
    frequency returns to normal.
    Current Limit and Thermal Shutdown Operation
    The LT3580 has a current limit circuit not shown in the
    Block Diagram. The switch current is consistently moni-
    tored and not allowed to exceed the maximum switch
    current at a given duty cycle (see the Electrical Charac-
    teristics table). If the switch current reaches this value,
    the SR latch (SR1) is reset regardless of the state of the
    comparator (A1/A2). Also not shown in the Block Diagram
    is the thermal shutdown circuit. If the temperature of the
    part exceeds approximately 165°C, the SR2 latch is set
    regardless of the state of the comparator (A1/A2). A full
    soft-start cycle will then be initiated. The current limit and
    thermal shutdown circuits protect the power switch as well
    as the external components connected to the LT3580.
    
    
    
    
    
    


    


    

    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
LT3582EUD-12#PBF
0.72 A SWITCHING REGULATOR, PQCC16

    

    
LT3582EUD-5#TRPBF
0.72 A SWITCHING REGULATOR, PQCC16

    

    
LT3582EUD#TRPBF
0.72 A SWITCHING REGULATOR, PQCC16

    

    
LT3582EUD-12#TRPBF
0.72 A SWITCHING REGULATOR, PQCC16

    

    
LT3582EUD#PBF
0.72 A SWITCHING REGULATOR, PQCC16

    

    

    

    


    


    

    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
LT3581
 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection

    

    
LT3581EDE#PBF
功能描述:IC REG MULTI CONFIG ADJ 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2

    

    
LT3581EDE#TRPBF
功能描述:IC REG MULTI CONFIG ADJ 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤

    

    
LT3581EDE-PBF
 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection

    

    
LT3581EDE-TRPBF
 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection

    

    
    
    
    
	
    	
    
    
     
     
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