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97I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） 97I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97I嘉泰姆

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一,产品概述(General Description)      97I嘉泰姆
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     The CXSU63034 is a highly efficient fix frequencysynchronous step-up97I嘉泰姆
DC/DC converter. Output voltage of the device is adjustable. Power97I嘉泰姆
dissipation during operation is only 40μA typical and drops to less than97I嘉泰姆
1μA in shutdown. The 0.85V to 5V input voltage range makes the CXSU6303497I嘉泰姆
ideally suitable for single cell Li-ion battery, single or dual AA battery voltage97I嘉泰姆
step-up applications. Automatic PFM Mode operation increases efficiency at97I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 and97I嘉泰姆
output capacitors. The internal synchronous switchesenhance efficiency.97I嘉泰姆
Anti-ringing control circuitry reduces EMI by damping the inductance effect97I嘉泰姆
in DCM mode. The CXSU63034 is available in SOT23-6 package.97I嘉泰姆
二.产品特点(Features)97I嘉泰姆
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Input Voltage Operating Range: 0.85V to 5V97I嘉泰姆
Voltage Output Range: 2.5V to 5.5V97I嘉泰姆
Efficiency Up to 94%97I嘉泰姆
3.3V/100mA Output at 1.0V Input97I嘉泰姆
5V/700mA Output at 3.6V Input97I嘉泰姆
Low Start-up Voltage: 0.85V Typical97I嘉泰姆
1.2MHz Constant Frequency Operation97I嘉泰姆
Internal Synchronous Rectifier97I嘉泰姆
EMI Reduction Anti-Ring Control Circuitry97I嘉泰姆
Low Shutdown Current: < 1.0uA97I嘉泰姆
Over Current Protection97I嘉泰姆
Over Temperature Protection97I嘉泰姆
Light Load PFM Mode Operation97I嘉泰姆
SOT23-6 Package97I嘉泰姆
三,应用范围 (Applications)97I嘉泰姆
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 Li-ion Battery Charger97I嘉泰姆

 TYPICAL APPLICATIONS
USB Audio97I嘉泰姆
Wireless Mouse97I嘉泰姆
Digital Still Cameras97I嘉泰姆
MP3/MP4 Players97I嘉泰姆
Portable Instruments97I嘉泰姆
四.技术规格书下载（产品PDF）97I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！97I嘉泰姆

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五,产品封装图 (Package)97I嘉泰姆
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六.电路原理图97I嘉泰姆
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七,功能概述97I嘉泰姆
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1)General Description97I嘉泰姆
The CXSU63034 is a synchronous step-up DC-DC converter.97I嘉泰姆
It utilizes internal MOSFET switches to achieve high97I嘉泰姆
efficiency over full load current range. It operates at a97I嘉泰姆
fixed switching frequency of 1.2MHz, and uses the97I嘉泰姆
slope compensated peak current mode pulse width97I嘉泰姆
modulation (PWM) architecture. The device can97I嘉泰姆
operate with an input voltage below 1V and the97I嘉泰姆
minimum start-up voltage is 0.85V.97I嘉泰姆
2) Current Mode Operation 97I嘉泰姆
The CXSU63034 is based on a slope compensated peak97I嘉泰姆
current mode PWM control topology. It operates at a97I嘉泰姆
fixed frequency of 1.2MHz. At the beginning of each97I嘉泰姆
clock cycle, the main switch (NMOS) is turned on and97I嘉泰姆
the inductor current starts to ramp. After the maximum97I嘉泰姆
duty cycle or the sense current signal equals the error97I嘉泰姆
amplifier output, the main switch is turned off and the97I嘉泰姆
synchronous switch (PMOS) is turned on. This control97I嘉泰姆
topology features cycle-by-cycle current limiting which97I嘉泰姆
can prevent the main switch from overstress and the97I嘉泰姆
external inductor from saturating.97I嘉泰姆
3) Synchronous Rectification 97I嘉泰姆
The CXSU63034 integrates a synchronous rectifier to97I嘉泰姆
improve efficiency as well as to eliminate the need for97I嘉泰姆
an external Schottky diode. The synchronous rectifier is97I嘉泰姆
used to reduce the loss condition contributed by the97I嘉泰姆
forward voltage of an external Schottky diode. The97I嘉泰姆
synchronous rectifier is realized by a P-channel MOS97I嘉泰姆
(PMOS) with gate control circuitry that incorporates97I嘉泰姆
八,相关芯片选择指南           更多同类产品........    97I嘉泰姆

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