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    产品型号MP2309DS的Datasheet PDF文件预览

    TM  
    MP2309  
    1A, 23V, 340KHz Synchronous Rectified  
    Step-Down Converter  
    TM  
    The Future of Analog IC Technology  
    DESCRIPTION  
    FEATURES  
    The MP2309 is a monolithic synchronous buck  
    regulator. The device integrates 140mΩ  
    MOSFETS that provide 1A continuous load  
    current over a wide operating input voltage of  
    4.75V to 23V. Current mode control provides  
    fast transient response and cycle-by-cycle  
    current limit.  
    •
    •
    •
    •
    •
    •
    •
    •
    •
    •
    1A Output Current  
    Wide 4.75V to 23V Operating Input Range  
    Integrated 140mΩ Power MOSFET Switches  
    Output Adjustable from 0.923V to 20V  
    Up to 95% Efficiency  
    Programmable Soft-Start  
    Stable with Low ESR Ceramic Output Capacitors  
    Fixed 340KHz Frequency  
    An adjustable soft-start prevents inrush current  
    at turn-on. Shutdown mode drops the supply  
    current to 1µA.  
    Cycle-by-Cycle Over Current Protection  
    Input Under Voltage Lockout  
    This device, available in an 8-pin SOIC  
    package, provides a very compact system  
    solution with minimal reliance on external  
    components.  
    APPLICATIONS  
    •
    •
    •
    •
    •
    Distributed Power Systems  
    Networking Systems  
    FPGA, DSP, ASIC Power Supplies  
    Green Electronics/ Appliances  
    Notebook Computers  
    EVALUATION BOARD REFERENCE  
    Board Number  
    Dimensions  
    EV2309DS-00A  
    2.0”X x 1.5”Y x 0.5”Z  
    “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic  
    Power Systems, Inc.  
    TYPICAL APPLICATION  
    C5  
    10nF  
    Efficiency vs  
    Load Current  
    INPUT  
    4.75V to 23V  
    100  
    90  
    80  
    2
    1
    V
    = 5V  
    IN  
    BS  
    IN  
    OUTPUT  
    3.3V  
    1A  
    3
    5
    7
    EN  
    SW  
    70  
    60  
    50  
    40  
    30  
    20  
    V
    = 12V  
    IN  
    MP2309  
    8
    SS  
    FB  
    COMP  
    V
    = 23V  
    IN  
    GND  
    1%  
    4
    6
    C3  
    3.3nF  
    0
    0.25  
    0.5  
    0.75  
    1.0  
    LOAD CURRENT (A)  
    MP2309-TAC01  
    MP2309-EC01  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    1
    TM  
    MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  
    PACKAGE REFERENCE  
    ABSOLUTE MAXIMUM RATINGS (1)  
    Supply Voltage VIN.......................–0.3V to +26V  
    Switch Voltage VSW.................. –1V to VIN +0.3V  
    Boost Voltage VBS..........VSW – 0.3V to VSW + 6V  
    All Other Pins.................................–0.3V to +6V  
    Junction Temperature...............................150°C  
    Lead Temperature....................................260°C  
    Storage Temperature .............–65°C to +150°C  
    Recommended Operating Conditions (2)  
    Input Voltage VIN............................ 4.75V to 23V  
    Output Voltage VOUT .................... 0.923V to 20V  
    Ambient Operating Temperature .... –40°C to +85°C  
    TOP VIEW  
    BS  
    IN  
    1
    2
    3
    4
    8
    7
    6
    5
    SS  
    EN  
    SW  
    GND  
    COMP  
    FB  
    MP2309_PD01_SOIC8  
    Thermal Resistance (3)  
    θJA  
    θJC  
    SOIC8.....................................90...... 45... °C/W  
    Part Number*  
    Package  
    SOIC8  
    Temperature  
    Notes:  
    1) Exceeding these ratings may damage the device.  
    2) The device is not guaranteed to function outside of its  
    operating conditions.  
    MP2309DS  
    –40° to +85°C  
    For Tape & Reel, add suffix –Z (eg. MP2309DS–Z)  
    For Lead Free, add suffix –LF (eg. MP2309DS–LF–Z)  
    *
    3) Measured on approximately 1” square of 1 oz copper.  
    ELECTRICAL CHARACTERISTICS  
    VIN = 12V, TA = +25°C, unless otherwise noted.  
    Parameter  
    Symbol Condition  
    Min  
    Typ  
    1
    Max  
    3.0  
    Units  
    µA  
    mA  
    V
    Shutdown Supply Current  
    Supply Current  
    VEN = 0V  
    VEN = 2.0V, VFB = 1.0V  
    4.75V ≤ VIN ≤ 23V  
    1.3  
    1.5  
    Feedback Voltage  
    VFB  
    0.900  
    0.923  
    1.1  
    0.946  
    Feedback Overvoltage Threshold  
    Error Amplifier Voltage Gain (4)  
    Error Amplifier Transconductance  
    High-Side Switch On Resistance (4)  
    Low-Side Switch On Resistance (4)  
    High-Side Switch Leakage Current  
    Upper Switch Current Limit  
    Lower Switch Current Limit  
    V
    AEA  
    400  
    800  
    140  
    140  
    V/V  
    µA/V  
    mΩ  
    mΩ  
    µA  
    A
    GEA  
    ∆IC = ±10µA  
    RDS(ON)1  
    RDS(ON)2  
    VEN = 0V, VSW = 0V  
    Minimum Duty Cycle  
    From Drain to Source  
    10  
    1.4  
    2
    0.8  
    A
    COMP to Current Sense  
    Transconductance  
    GCS  
    2.4  
    A/V  
    Oscillation Frequency  
    Fosc1  
    Fosc2  
    340  
    100  
    90  
    KHz  
    KHz  
    %
    Short Circuit Oscillation Frequency  
    VFB = 0V  
    Maximum Duty Cycle  
    Minimum On Time (4)  
    DMAX VFB = 0.8V  
    220  
    1.5  
    nS  
    V
    EN Shutdown Threshold  
    EN Shutdown Threshold Hysteresis  
    EN Lockout Threshold Voltage  
    EN Lockout Hysteresis  
    VEN Rising  
    1.1  
    2.2  
    2.0  
    2.7  
    210  
    2.5  
    mV  
    V
    210  
    mV  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    2
    TM  
    MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  
    ELECTRICAL CHARACTERISTICS (continued)  
    VIN = 12V, TA = +25°C, unless otherwise noted.  
    Parameter  
    Symbol Condition  
    Min  
    Typ  
    Max  
    Units  
    Input Under Voltage Lockout  
    Threshold  
    VIN Rising  
    3.80  
    4.10  
    4.40  
    V
    Input Under Voltage Lockout  
    Threshold Hysteresis  
    210  
    mV  
    Soft-Start Current  
    Soft-Start Period  
    VSS = 0V  
    CSS = 0.1µF  
    6
    15  
    160  
    µA  
    ms  
    °C  
    Thermal Shutdown (4)  
    Note:  
    4) Guaranteed by design, not tested.  
    PIN FUNCTIONS  
    Pin # Name Description  
    High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET  
    switch. Connect a 0.01µF or greater capacitor from SW to BS to power the high side switch.  
    1
    2
    BS  
    IN  
    Power Input. IN supplies the power to the IC, as well as the step-down converter switches.  
    Drive IN with a 4.75V to 23V power source. Bypass IN to GND with a suitably large capacitor  
    to eliminate noise on the input to the IC. See Input Capacitor.  
    Power Switching Output. SW is the switching node that supplies power to the output. Connect  
    the output LC filter from SW to the output load. Note that a capacitor is required from SW to  
    BS to power the high-side switch.  
    3
    4
    5
    SW  
    GND Ground.  
    Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a  
    resistive voltage divider from the output voltage. The feedback threshold is 0.923V. See  
    FB  
    Setting the Output Voltage.  
    Compensation Node. COMP is used to compensate the regulation control loop. Connect a  
    series RC network from COMP to GND to compensate the regulation control loop. In some  
    cases, an additional capacitor from COMP to GND is required. See Compensation  
    Components.  
    6
    COMP  
    Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on  
    the regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic startup.  
    7
    8
    EN  
    SS  
    Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND  
    to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To disable the  
    soft-start feature, leave SS unconnected.  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    3
    TM  
    MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  
    TYPICAL PERFORMANCE CHARACTERISTICS  
    VIN = 12V, VOUT = 3.3V, L = 10µH, C1 = 10µF, C2 = 22µF, TA = +25°C, unless otherwise noted.  
    No Load Operation  
    Full Load Operation  
    No Load  
    1A Load  
    V
    V
    IN, AC  
    20mV/div.  
    IN, AC  
    V
    200mV/div.  
    EN  
    5V/div.  
    V
    V
    O, AC  
    O, AC  
    V
    20mV/div.  
    20mV/div.  
    OUT  
    2V/div.  
    I
    I
    L
    L
    I
    1A/div.  
    1A/div.  
    L
    1A/div.  
    V
    V
    SW  
    SW  
    V
    10V/div.  
    10V/div.  
    SW  
    10V/div.  
    2ms/div.  
    MP2309-TPC03  
    MP2309-TPC01  
    MP2309-TPC02  
    Shutdown through Enable  
    Shutdown through Enable  
    V
    = 12V, V  
    = 3.3V,  
    = 1A (Resistance Load)  
    IN  
    OUT  
    V
    = 12V, V = 3.3V, No Load  
    OUT  
    IN  
    I
    OUT  
    V
    EN  
    V
    V
    EN  
    EN  
    5V/div.  
    5V/div.  
    5V/div.  
    V
    OUT  
    2V/div.  
    V
    V
    OUT  
    OUT  
    2V/div.  
    2V/div.  
    I
    I
    L
    L
    I
    L
    1A/div.  
    1A/div.  
    1A/div.  
    V
    V
    V
    SW  
    SW  
    SW  
    10V/div.  
    10V/div.  
    10V/div.  
    2ms/div.  
    2ms/div.  
    2ms/div.  
    MP2309-TPC06  
    MP2309-TPC04  
    MP2309-TPC05  
    Load Transient Test  
    Short Circuit Recovery  
    Short Circuit Entry  
    V
    = 12V, V  
    = 3.3V,  
    = 0.2A to 1A steps  
    IN  
    OUT  
    I
    OUT  
    V
    OUT  
    V
    OUT  
    V
    200mV/div.  
    OUT  
    2V/div.  
    2V/div.  
    I
    L
    1A/div.  
    i
    LOAD  
    I
    L
    I
    1A/div.  
    L
    1A/div.  
    1A/div.  
    MP2309-TPC09  
    MP2309-TPC07  
    MP2309-TPC8  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    4
    TM  
    MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  
    OPERATION  
    The converter uses internal N-Channel  
    MOSFET switches to step-down the input  
    voltage to the regulated output voltage. Since  
    the high side MOSFET requires a gate voltage  
    greater than the input voltage, a boost capacitor  
    connected between SW and BS is needed to  
    drive the high side gate. The boost capacitor is  
    charged from the internal 5V rail when SW is low.  
    FUNCTIONAL DESCRIPTION  
    The MP2309 is a synchronous rectified,  
    current-mode, step-down regulator. It regulates  
    input voltages from 4.75V to 23V down to an  
    output voltage as low as 0.923V, and supplies  
    up to 1A of load current.  
    The MP2309 uses current-mode control to  
    regulate the output voltage. The output voltage  
    is measured at FB through a resistive voltage  
    divider and amplified through the internal  
    transconductance error amplifier. The voltage at  
    the COMP pin is compared to the switch current  
    measured internally to control the output  
    voltage.  
    When the MP2309 FB pin exceeds 20% of the  
    nominal regulation voltage of 0.923V, the over  
    voltage comparator is tripped and the COMP  
    pin and the SS pin are discharged to GND,  
    forcing the high-side switch off.  
    +
    CURRENT  
    2
    IN  
    OVP  
    SENSE  
    AMPLIFIER  
    +
    --  
    --  
    +
    1.1V  
    0.3V  
    5V  
    RAMP  
    CLK  
    OSCILLATOR  
    100/340KHz  
    5
    FB  
    1
    3
    BS  
    --  
    S
    Q
    Q
    --  
    +
    --  
    +
    +
    SW  
    R
    CURRENT  
    COMPARATOR  
    8
    6
    SS  
    ERROR  
    AMPLIFIER  
    0.923V  
    COMP  
    4
    GND  
    OVP  
    1.2V  
    +
    --  
    2.5V  
    EN  
    IN  
    IN < 4.10V  
    EN OK  
    LOCKOUT  
    COMPARATOR  
    7
    +
    --  
    EN  
    INTERNAL  
    REGULATORS  
    5V  
    SHUTDOWN  
    COMPARATOR  
    1.5V  
    MP2309_F01_BD01  
    Figure 1—Functional Block Diagram  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    5
    TM  
    MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  
    APPLICATIONS INFORMATION  
    the maximum switch current limit. The inductance  
    value can be calculated by:  
    COMPONENT SELECTION  
    Setting the Output Voltage  
    The output voltage is set using a resistive  
    voltage divider from the output voltage to FB  
    pin. The voltage divider divides the output  
    voltage down to the feedback voltage by the  
    ratio:  
    ⎛
    ⎜
    ⎝
    ⎞
    ⎟
    ⎟
    ⎠
    VOUT  
    VOUT  
    VIN  
    ⎜
    L =  
    × 1−  
    fS × ∆L  
    Where VIN is the input voltage, fS is the switching  
    frequency, and ∆IL is the peak-to-peak inductor  
    ripple current.  
    R2  
    VFB = VOUT  
    R1+ R2  
    Choose an inductor that will not saturate under  
    the maximum inductor peak current. The peak  
    inductor current can be calculated by:  
    Thus the output voltage is:  
    R1+ R2  
    VOUT = 0.923 ×  
    ⎛
    ⎞
    ⎟
    ⎟
    ⎠
    VOUT  
    VOUT  
    VIN  
    R2  
    ⎜
    ILP = ILOAD  
    +
    × 1−  
    ⎜
    ⎝
    2× fS ×L  
    Where VOUT is the output voltage and VFB is  
    the feedback voltage.  
    Where ILOAD is the load current.  
    R2 can be as high as 100kΩ, but a typical  
    value is 10kΩ. Using the typical value for R2,  
    R1 is determined by:  
    The choice of which style inductor to use mainly  
    depends on the price vs. size requirements and  
    any EMI requirements.  
    R1 = 10.87 × (VOUT − 0.923)  
    Optional Schottky Diode  
    During the transition between high-side switch  
    and low-side switch, the body diode of the low-  
    side power MOSFET conducts the inductor  
    current. The forward voltage of this body diode is  
    high. An optional Schottky diode may be  
    paralleled between the SW pin and GND pin to  
    improve overall efficiency. Table 2 lists example  
    Schottky diodes and their Manufacturers.  
    For example, for a 3.3V output voltage, R2 is  
    10kΩ, and R1 is 26.1kΩ.  
    Table 1 lists recommended resistor values.  
    Table1—Recommended Resistors  
    VOUT  
    1.8V  
    2.5V  
    3.3V  
    5V  
    R1  
    R2  
    9.53kΩ  
    16.9kΩ  
    26.1kΩ  
    44.2Ω  
    121kΩ  
    10kΩ  
    10kΩ  
    10kΩ  
    10kΩ  
    10kΩ  
    Table 2—Diode Selection Guide  
    Voltage/Current  
    Part Number  
    B130  
    Rating  
    30V, 1A  
    30V, 1A  
    30V, 1A  
    Vendor  
    12V  
    Diodes, Inc.  
    Diodes, Inc.  
    SK13  
    Inductor  
    MBRS130  
    International  
    Rectifier  
    The inductor is required to supply constant  
    current to the output load while being driven  
    by the switched input voltage. A larger value  
    inductor will result in less ripple current that  
    will result in lower output ripple voltage.  
    However, the larger value inductor will have a  
    larger physical size, higher series resistance,  
    and/or lower saturation current. A good rule  
    for determining the inductance to use is to  
    allow the peak-to-peak ripple current in the  
    inductor to be approximately 30% of the  
    maximum switch current limit. Also, make  
    sure that the peak inductor current is below  
    Input Capacitor  
    The input current to the step-down converter is  
    discontinuous, therefore a capacitor is required to  
    supply the AC current to the step-down converter  
    while maintaining the DC input voltage. Use low  
    ESR capacitors for the best performance.  
    Ceramic capacitors are preferred, but tantalum or  
    low-ESR electrolytic capacitors may also suffice.  
    Choose X5R or X7R dielectrics when using  
    ceramic capacitors.  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    6
    TM  
    MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  
    Since the input capacitor (C1) absorbs the input  
    switching current it requires an adequate ripple  
    current rating. The RMS current in the input  
    capacitor can be estimated by:  
    In the case of tantalum or electrolytic  
    capacitors, the ESR dominates the impedance  
    at the switching frequency. For simplification,  
    the output ripple can be approximated to:  
    VOUT  
    VOUT  
    VIN  
    ⎛
    ⎞
    ⎛
    ⎞
    ⎟
    VOUT  
    VOUT  
    ⎜
    ∆VOUT  
    =
    × ⎜1−  
    ⎟ ×RESR  
    IC1 = ILOAD  
    ×
    × 1−  
    ⎜
    ⎟
    ⎜
    ⎝
    ⎟
    ⎠
    fS ×L  
    V
    V
    ⎝
    ⎠
    IN  
    IN  
    The characteristics of the output capacitor also  
    affect the stability of the regulation system. The  
    MP2309 can be optimized for a wide range of  
    capacitance and ESR values.  
    The worst-case condition occurs at VIN = 2VOUT  
    ,
    where IC1 = ILOAD/2. For simplification, choose  
    the input capacitor whose RMS current rating  
    greater than half of the maximum load current.  
    Compensation Components  
    The input capacitor can be electrolytic, tantalum  
    or ceramic. When using electrolytic or tantalum  
    capacitors, a small, high quality ceramic  
    capacitor, i.e. 0.1µF, should be placed as close  
    to the IC as possible. When using ceramic  
    capacitors, make sure that they have enough  
    capacitance to provide sufficient charge to  
    prevent excessive voltage ripple at input. The  
    input voltage ripple caused by capacitance can  
    be estimated by:  
    MP2309 employs current mode control for easy  
    compensation and fast transient response. The  
    system stability and transient response are  
    controlled through the COMP pin. COMP pin is  
    the output of the internal transconductance  
    error amplifier. A series capacitor-resistor  
    combination sets a pole-zero combination to  
    control the characteristics of the control system.  
    The DC gain of the voltage feedback loop is  
    given by:  
    ⎛
    ⎜
    ⎝
    ⎞
    ⎟
    ⎟
    ⎠
    ILOAD VOUT  
    VOUT  
    ⎜
    ∆V  
    =
    ×
    × 1−  
    IN  
    C1  
    VIN  
    V
    VFB  
    IN  
    AVDC = RLOAD × GCS × AVEA  
    ×
    VOUT  
    Output Capacitor  
    The output capacitor is required to maintain the  
    DC output voltage. Ceramic, tantalum, or low  
    ESR electrolytic capacitors are recommended.  
    Low ESR capacitors are preferred to keep the  
    output voltage ripple low. The output voltage  
    ripple can be estimated by:  
    Where VFB is the feedback voltage, 0.923V;  
    AVEA is the error amplifier voltage gain; GCS is  
    the current sense transconductance and RLOAD  
    is the load resistor value.  
    The system has 2 poles of importance. One is  
    due to the compensation capacitor (C3) and the  
    output resistor of error amplifier, and the other  
    is due to the output capacitor and the load  
    resistor. These poles are located at:  
    ⎛
    ⎜
    ⎝
    ⎞
    ⎟
    ⎟
    ⎛
    ⎞
    ⎟
    ⎟
    ⎠
    VOUT  
    VOUT  
    VIN  
    1
    ⎜
    ⎜
    ∆VOUT  
    =
    × 1−  
    × RESR  
    +
    ⎜
    ⎝
    fS × L  
    8 × fS × C2  
    ⎠
    Where C2 is the output capacitance value and  
    RESR is the equivalent series resistance (ESR)  
    value of the output capacitor.  
    GEA  
    fP1  
    =
    2π× C3× AVEA  
    1
    In the case of ceramic capacitors, the  
    impedance at the switching frequency is  
    dominated by the capacitance. The output  
    voltage ripple is mainly caused by the  
    capacitance. For simplification, the output  
    voltage ripple can be estimated by:  
    fP2  
    =
    2π × C2× RLOAD  
    Where  
    GEA  
    is  
    the  
    error  
    amplifier  
    transconductance.  
    ⎛
    ⎜
    ⎝
    ⎞
    VOUT  
    VOUT  
    VIN  
    ⎜
    ⎟
    ⎟
    ⎠
    ∆VOUT  
    =
    × 1−  
    2
    8 × fS × L × C2  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    7
    TM  
    MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  
    The system has one zero of importance, due to the  
    compensation capacitor (C3) and the compensation  
    resistor (R3). This zero is located at:  
    2. Choose the compensation capacitor (C3) to  
    achieve the desired phase margin. For  
    applications with typical inductor values, setting  
    the compensation zero, fZ1, below one-forth of  
    the crossover frequency provides sufficient  
    phase margin.  
    1
    fZ1  
    =
    2π × C3×R3  
    The system may have another zero of  
    importance, if the output capacitor has a large  
    capacitance and/or a high ESR value. The zero,  
    due to the ESR and capacitance of the output  
    capacitor, is located at:  
    Determine the C3 value by the following equation:  
    4
    C3 >  
    2π × R3 × fC  
    Where R3 is the compensation resistor.  
    1
    fESR  
    =
    3. Determine if the second compensation  
    capacitor (C6) is required. It is required if the  
    ESR zero of the output capacitor is located at  
    less than half of the switching frequency, or the  
    following relationship is valid:  
    2π × C2× RESR  
    In this case (as shown in Figure 2), a third pole  
    set by the compensation capacitor (C6) and the  
    compensation resistor (R3) is used to  
    compensate the effect of the ESR zero on the  
    loop gain. This pole is located at:  
    fS  
    2
    1
    <
    2π × C2× RESR  
    1
    fP3  
    =
    If this is the case, then add the second  
    compensation capacitor (C6) to set the pole fP3  
    at the location of the ESR zero. Determine the  
    C6 value by the equation:  
    2π× C6×R3  
    The goal of compensation design is to shape  
    the converter transfer function to get a desired  
    loop gain. The system crossover frequency  
    where the feedback loop has the unity gain is  
    important. Lower crossover frequencies result  
    in slower line and load transient responses,  
    while higher crossover frequencies could cause  
    system unstable. A good rule of thumb is to set  
    the crossover frequency below one-tenth of the  
    switching frequency. Determine the R3 value by  
    the following equation:  
    C2 × RESR  
    C6 =  
    R3  
    External Bootstrap Diode  
    It is recommended that an external bootstrap  
    diode be added when the system has a 5V  
    fixed input or the power supply generates a 5V  
    output. This helps improve the efficiency of the  
    regulator. The bootstrap diode can be a low  
    cost one such as IN4148 or BAT54.  
    2π × C2 × fC VOUT 2π × C2 × 0.1× fS VOUT  
    R3 =  
    ×
    <
    ×
    5V  
    GEA × GCS  
    VFB  
    GEA × GCS  
    VFB  
    Where fC is the desired crossover frequency  
    which is typically below one tenth of the  
    switching frequency.  
    BS  
    10nF  
    MP2309  
    To optimize the compensation components, the  
    following procedure can be used.  
    SW  
    MP2309_F02  
    1. Choose the compensation resistor (R3) to set  
    the desired crossover frequency.  
    Figure 2—External Bootstrap Diode  
    This diode is also recommended for high duty  
    VOUT  
    cycle operation (when  
    >65%) and high  
    VIN  
    output voltage (VOUT>12V) applications.  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    8
    TM  
    MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  
    TYPICAL APPLICATION CIRCUIT  
    C5  
    10nF  
    INPUT  
    4.75V to 23V  
    2
    1
    IN  
    BS  
    OUTPUT  
    3.3V  
    1A  
    3
    5
    7
    EN  
    SW  
    MP2309  
    8
    SS  
    GND  
    FB  
    COMP  
    1%  
    4
    6
    D1  
    C3  
    3.3nF  
    B130  
    C6  
    (optional)  
    (optional)  
    MP2309-F03  
    Figure 3—MP2309 with 3.3V Output, 22uF/6.3V Ceramic Output Capacito  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    9
    TM  
    MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  
    PACKAGE INFORMATION  
    SOIC8  
    NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.  
    Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS  
    products into any application. MPS will not assume any legal responsibility for any said applications.  
    MP2309 Rev. 1.4  
    3/13/2006  
    www.MonolithicPower.com  
    MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
    © 2006 MPS. All Rights Reserved.  
    10  
    配单直通车
    MP2309DS产品参数
    型号:MP2309DS
    是否无铅： 含铅
    是否Rohs认证： 不符合
    生命周期：Not Recommended
    零件包装代码：SOIC
    包装说明：SOP,
    针数：8
    Reach Compliance Code：compliant
    ECCN代码：EAR99
    HTS代码：8542.39.00.01
    风险等级：5.18
    模拟集成电路 - 其他类型：SWITCHING REGULATOR
    控制模式：CURRENT-MODE
    最大输入电压：23 V
    最小输入电压：4.75 V
    标称输入电压：12 V
    JESD-30 代码：R-PDSO-G8
    长度：4.9 mm
    功能数量：1
    端子数量：8
    最高工作温度：85 °C
    最低工作温度：-40 °C
    最大输出电流：2 A
    封装主体材料：PLASTIC/EPOXY
    封装代码：SOP
    封装形状：RECTANGULAR
    封装形式：SMALL OUTLINE
    峰值回流温度（摄氏度）：NOT SPECIFIED
    认证状态：Not Qualified
    座面最大高度：1.75 mm
    表面贴装：YES
    切换器配置：BUCK
    最大切换频率：340 kHz
    温度等级：INDUSTRIAL
    端子形式：GULL WING
    端子节距：1.27 mm
    端子位置：DUAL
    处于峰值回流温度下的最长时间：NOT SPECIFIED
    宽度：3.9 mm
    Base Number Matches：1
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