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    參數(shù)資料
    

    


    


    
型號：
TC1303B-QG0EUNTR

    

    
元件分類：
穩(wěn)壓器

    

    
英文描述：
0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10

    

    
封裝：
PLASTIC, MO-187, MSOP-10

    

    
文件頁數(shù)：
14/38頁

    

    
文件大?。?/td>
756K

    

    
代理商：
TC1303B-QG0EUNTR


    

    

    

	
    
    
    

    
    
	
     2008 Microchip Technology Inc.
    DS21949C-page 21
    TC1303A/TC1303B/TC1303C/TC1304
    4.0
    DETAILED DESCRIPTION
    4.1
    Device Overview
    The
    TC1303/TC1304
    combines
    a
    500 mA
    synchronous buck regulator with a 300 mA LDO and a
    power-good output. This unique combination provides
    a small, low-cost solution for applications that require
    two or more voltage rails. The buck regulator can
    deliver high-output current over a wide range of input-
    to-output voltage ratios while maintaining high
    efficiency. This is typically used for the lower-voltage,
    high-current processor core. The LDO is a minimal
    parts-count solution (single-output capacitor), providing
    a regulated voltage for an auxiliary rail. The typical LDO
    dropout voltage (137 mV @ 200 mA) allows the use of
    very low input-to-output LDO differential voltages,
    minimizing the power loss internal to the LDO pass
    transistor. A power-good output is provided, indicating
    that the buck regulator output, the LDO output or both
    outputs are in regulation. Additional features include
    independent shutdown inputs (TC1303), UVLO, output
    voltage
    sequencing
    (TC1304),
    overcurrent and
    overtemperature shutdown.
    4.2
    Synchronous Buck Regulator
    The synchronous buck regulator is capable of
    supplying a 500 mA continuous output current over a
    wide range of input and output voltages. The output
    voltage range is from 0.8V (minimum) to 4.5V
    (maximum). The regulator operates in three different
    modes, automatically selecting the most efficient mode
    of operation. During heavy load conditions, the
    TC1303/TC1304 buck converter operates at a high,
    fixed frequency (2.0 MHz) using current mode control.
    This minimizes output ripple and noise (less than 8 mV
    peak-to-peak ripple) while maintaining high efficiency
    (typically > 90%). For standby or light load applications,
    the buck regulator will automatically switch to a power-
    saving Pulse Frequency Modulation (PFM) mode. This
    minimizes the quiescent current draw on the battery,
    while keeping the buck output voltage in regulation.
    The typical buck PFM mode current is 38 A. The buck
    regulator is capable of operating at 100% duty cycle,
    minimizing the voltage drop from input-to-output for
    wide input, battery-powered applications. For fixed-
    output voltage applications, the feedback divider and
    control loop compensation components are integrated,
    eliminating the need for external components. The
    buck regulator output is protected against overcurrent,
    short circuit and overtemperature. While shut down, the
    synchronous buck N-channel and P-channel switches
    are off, so the LX pin is in a high-impedance state (this
    allows for connecting a source on the output of the
    buck regulator as long as its voltage does not exceed
    the input voltage).
    4.2.1
    FIXED-FREQUENCY PWM MODE
    While operating in Pulse Width Modulation (PWM)
    mode, the TC1303/TC1304 buck regulator switches at
    a fixed, 2.0 MHz frequency. The PWM mode is suited
    for higher load current operation, maintaining low
    output noise and high conversion efficiency. PFM-to-
    PWM mode transition is initiated for any of the following
    conditions:
     Continuous inductor current is sensed
     Inductor peak current exceeds 100 mA
     The buck regulator output voltage has dropped
    out of regulation (step load has occurred)
    The typical PFM-to-PWM threshold is 80 mA.
    4.2.2
    PFM MODE
    PFM mode is entered when the output load on the buck
    regulator is very light. Once detected, the converter
    enters the PFM mode automatically and begins to skip
    pulses to minimize unnecessary quiescent current
    draw by reducing the number of switching cycles per
    second. The typical quiescent current for the switching
    regulator is less than 35 A. The transition from PWM
    to PFM mode occurs when discontinuous inductor
    current is sensed or the peak inductor current is less
    than 60 mA (typical). The typical PWM to PFM mode
    threshold is 30 mA. For low input-to-output differential
    voltages, the PWM-to-PFM mode threshold can be low
    due to the lack of ripple current. It is recommended that
    VIN1 be one volt greater than VOUT1 for PWM-to-PFM
    transitions.
    4.3
    Low Drop Out Regulator (LDO)
    The LDO output is a 300 mA low-dropout linear
    regulator that provides a regulated output voltage with
    a single 1 F external capacitor. The output voltage is
    available in fixed options only, ranging from 1.5V to
    3.3V. The LDO is stable using ceramic output
    capacitors that inherently provide lower output noise
    and reduce the size and cost of the regulator solution.
    The quiescent current consumed by the LDO output is
    typically less than 40 A, with a typical dropout voltage
    of 137 mV at 200 mA. While operating in Dropout
    mode, the LDO quiescent current will increase,
    minimizing the necessary voltage differential needed
    for the LDO output to maintain regulation. The LDO
    output
    is
    protected
    against
    overcurrent
    and
    overtemperature conditions.
    
    
    
    
    
    


    


    

    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
TC1303B-QI1EUN
0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10

    

    
TC1303B-QJ1EUN
0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10

    

    
TC1303B-QP3EMF
0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10

    

    
TC1303B-QQ2EMFTR
0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10

    

    
TC1303B-QQ3EMFTR
0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10

    

    

    

    


    


    

    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
TC1303B-RD1EMF
功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20

    

    
TC1303B-RD1EMFTR
功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20

    

    
TC1303B-SA0EMF
功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20

    

    
TC1303B-SA0EMFTR
功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20

    

    
TC1303B-SD0EMF
功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20

    

    
    
    
    
	
    	
    
    
     
     
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