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g9B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） g9B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g9B嘉泰姆

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一,产品概述(General Description)      g9B嘉泰姆
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     The CXSU63034 is a highly efficient fix frequencysynchronous step-upg9B嘉泰姆
DC/DC converter. Output voltage of the device is adjustable. Powerg9B嘉泰姆
dissipation during operation is only 40μA typical and drops to less thang9B嘉泰姆
1μA in shutdown. The 0.85V to 5V input voltage range makes the CXSU63034g9B嘉泰姆
ideally suitable for single cell Li-ion battery, single or dual AA battery voltageg9B嘉泰姆
step-up applications. Automatic PFM Mode operation increases efficiency atg9B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 andg9B嘉泰姆
output capacitors. The internal synchronous switchesenhance efficiency.g9B嘉泰姆
Anti-ringing control circuitry reduces EMI by damping the inductance effectg9B嘉泰姆
in DCM mode. The CXSU63034 is available in SOT23-6 package.g9B嘉泰姆
二.产品特点(Features)g9B嘉泰姆
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Input Voltage Operating Range: 0.85V to 5Vg9B嘉泰姆
Voltage Output Range: 2.5V to 5.5Vg9B嘉泰姆
Efficiency Up to 94%g9B嘉泰姆
3.3V/100mA Output at 1.0V Inputg9B嘉泰姆
5V/700mA Output at 3.6V Inputg9B嘉泰姆
Low Start-up Voltage: 0.85V Typicalg9B嘉泰姆
1.2MHz Constant Frequency Operationg9B嘉泰姆
Internal Synchronous Rectifierg9B嘉泰姆
EMI Reduction Anti-Ring Control Circuitryg9B嘉泰姆
Low Shutdown Current: < 1.0uAg9B嘉泰姆
Over Current Protectiong9B嘉泰姆
Over Temperature Protectiong9B嘉泰姆
Light Load PFM Mode Operationg9B嘉泰姆
SOT23-6 Packageg9B嘉泰姆
三,应用范围 (Applications)g9B嘉泰姆
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 Li-ion Battery Chargerg9B嘉泰姆

 TYPICAL APPLICATIONS
USB Audiog9B嘉泰姆
Wireless Mouseg9B嘉泰姆
Digital Still Camerasg9B嘉泰姆
MP3/MP4 Playersg9B嘉泰姆
Portable Instrumentsg9B嘉泰姆
四.技术规格书下载（产品PDF）g9B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！g9B嘉泰姆

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五,产品封装图 (Package)g9B嘉泰姆
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g9B嘉泰姆

六.电路原理图g9B嘉泰姆
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七,功能概述g9B嘉泰姆
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1)General Descriptiong9B嘉泰姆
The CXSU63034 is a synchronous step-up DC-DC converter.g9B嘉泰姆
It utilizes internal MOSFET switches to achieve highg9B嘉泰姆
efficiency over full load current range. It operates at ag9B嘉泰姆
fixed switching frequency of 1.2MHz, and uses theg9B嘉泰姆
slope compensated peak current mode pulse widthg9B嘉泰姆
modulation (PWM) architecture. The device cang9B嘉泰姆
operate with an input voltage below 1V and theg9B嘉泰姆
minimum start-up voltage is 0.85V.g9B嘉泰姆
2) Current Mode Operation g9B嘉泰姆
The CXSU63034 is based on a slope compensated peakg9B嘉泰姆
current mode PWM control topology. It operates at ag9B嘉泰姆
fixed frequency of 1.2MHz. At the beginning of eachg9B嘉泰姆
clock cycle, the main switch (NMOS) is turned on andg9B嘉泰姆
the inductor current starts to ramp. After the maximumg9B嘉泰姆
duty cycle or the sense current signal equals the errorg9B嘉泰姆
amplifier output, the main switch is turned off and theg9B嘉泰姆
synchronous switch (PMOS) is turned on. This controlg9B嘉泰姆
topology features cycle-by-cycle current limiting whichg9B嘉泰姆
can prevent the main switch from overstress and theg9B嘉泰姆
external inductor from saturating.g9B嘉泰姆
3) Synchronous Rectification g9B嘉泰姆
The CXSU63034 integrates a synchronous rectifier tog9B嘉泰姆
improve efficiency as well as to eliminate the need forg9B嘉泰姆
an external Schottky diode. The synchronous rectifier isg9B嘉泰姆
used to reduce the loss condition contributed by theg9B嘉泰姆
forward voltage of an external Schottky diode. Theg9B嘉泰姆
synchronous rectifier is realized by a P-channel MOSg9B嘉泰姆
(PMOS) with gate control circuitry that incorporatesg9B嘉泰姆
八,相关芯片选择指南           更多同类产品........    g9B嘉泰姆