0.85V到5V的输入电压CXSU63034高效的固定频率同步DC/DC转换器自动PFM模式电磁干扰抑制反环控制电路

目录BBn嘉泰姆

1.产品概述       2.产品特点     3.应用范围      4.技术规格书下载（产品PDF文档） BBn嘉泰姆
5.产品封装图   6.电路原理图  7.功能概述      8.相关产品BBn嘉泰姆

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一,产品概述(General Description)      BBn嘉泰姆
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     The CXSU63034 is a highly efficient fix frequencysynchronous step-upBBn嘉泰姆
DC/DC converter. Output voltage of the device is adjustable. PowerBBn嘉泰姆
dissipation during operation is only 40μA typical and drops to less thanBBn嘉泰姆
1μA in shutdown. The 0.85V to 5V input voltage range makes the CXSU63034BBn嘉泰姆
ideally suitable for single cell Li-ion battery, single or dual AA battery voltageBBn嘉泰姆
step-up applications. Automatic PFM Mode operation increases efficiency atBBn嘉泰姆
light loads, further extend battery life. Switching frequency is internally set at 1.2MHz, design for use of small value surface mount inductor, input andBBn嘉泰姆
output capacitors. The internal synchronous switchesenhance efficiency.BBn嘉泰姆
Anti-ringing control circuitry reduces EMI by damping the inductance effectBBn嘉泰姆
in DCM mode. The CXSU63034 is available in SOT23-6 package.BBn嘉泰姆
二.产品特点(Features)BBn嘉泰姆
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Input Voltage Operating Range: 0.85V to 5VBBn嘉泰姆
Voltage Output Range: 2.5V to 5.5VBBn嘉泰姆
Efficiency Up to 94%BBn嘉泰姆
3.3V/100mA Output at 1.0V InputBBn嘉泰姆
5V/700mA Output at 3.6V InputBBn嘉泰姆
Low Start-up Voltage: 0.85V TypicalBBn嘉泰姆
1.2MHz Constant Frequency OperationBBn嘉泰姆
Internal Synchronous RectifierBBn嘉泰姆
EMI Reduction Anti-Ring Control CircuitryBBn嘉泰姆
Low Shutdown Current: < 1.0uABBn嘉泰姆
Over Current ProtectionBBn嘉泰姆
Over Temperature ProtectionBBn嘉泰姆
Light Load PFM Mode OperationBBn嘉泰姆
SOT23-6 PackageBBn嘉泰姆
三,应用范围 (Applications)BBn嘉泰姆
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 Li-ion Battery ChargerBBn嘉泰姆

 TYPICAL APPLICATIONS
USB AudioBBn嘉泰姆
Wireless MouseBBn嘉泰姆
Digital Still CamerasBBn嘉泰姆
MP3/MP4 PlayersBBn嘉泰姆
Portable InstrumentsBBn嘉泰姆
四.技术规格书下载（产品PDF）BBn嘉泰姆

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！BBn嘉泰姆

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五,产品封装图 (Package)BBn嘉泰姆
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六.电路原理图BBn嘉泰姆
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七,功能概述BBn嘉泰姆
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1)General DescriptionBBn嘉泰姆
The CXSU63034 is a synchronous step-up DC-DC converter.BBn嘉泰姆
It utilizes internal MOSFET switches to achieve highBBn嘉泰姆
efficiency over full load current range. It operates at aBBn嘉泰姆
fixed switching frequency of 1.2MHz, and uses theBBn嘉泰姆
slope compensated peak current mode pulse widthBBn嘉泰姆
modulation (PWM) architecture. The device canBBn嘉泰姆
operate with an input voltage below 1V and theBBn嘉泰姆
minimum start-up voltage is 0.85V.BBn嘉泰姆
2) Current Mode Operation BBn嘉泰姆
The CXSU63034 is based on a slope compensated peakBBn嘉泰姆
current mode PWM control topology. It operates at aBBn嘉泰姆
fixed frequency of 1.2MHz. At the beginning of eachBBn嘉泰姆
clock cycle, the main switch (NMOS) is turned on andBBn嘉泰姆
the inductor current starts to ramp. After the maximumBBn嘉泰姆
duty cycle or the sense current signal equals the errorBBn嘉泰姆
amplifier output, the main switch is turned off and theBBn嘉泰姆
synchronous switch (PMOS) is turned on. This controlBBn嘉泰姆
topology features cycle-by-cycle current limiting whichBBn嘉泰姆
can prevent the main switch from overstress and theBBn嘉泰姆
external inductor from saturating.BBn嘉泰姆
3) Synchronous Rectification BBn嘉泰姆
The CXSU63034 integrates a synchronous rectifier toBBn嘉泰姆
improve efficiency as well as to eliminate the need forBBn嘉泰姆
an external Schottky diode. The synchronous rectifier isBBn嘉泰姆
used to reduce the loss condition contributed by theBBn嘉泰姆
forward voltage of an external Schottky diode. TheBBn嘉泰姆
synchronous rectifier is realized by a P-channel MOSBBn嘉泰姆
(PMOS) with gate control circuitry that incorporatesBBn嘉泰姆
八,相关芯片选择指南           更多同类产品........    BBn嘉泰姆

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