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目录qdA嘉泰姆

1.产品概述                       2.产品特点qdA嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 qdA嘉泰姆
5.产品封装图                     6.电路原理图                   qdA嘉泰姆
7.功能概述                        8.相关产品qdA嘉泰姆

一,产品概述(General Description)      qdA嘉泰姆
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   The CXDC65105XCL/CXDC65105XCL series is a synchronous step-down micro DC/DC converter whichqdA嘉泰姆
integrates an inductor and  a control IC in one tiny package (2.5mm×2.0mm, h=1.0mm). A stable powerqdA嘉泰姆
supply with an output current of 400mA is configured using only two capacitors connected externally.qdA嘉泰姆

Operating voltage range is from 2.0V to 6.0V.
    Output voltage is internally set in a range from 0.8V to 4.0V in increments of 0.05V. The device is operatedqdA嘉泰姆
by 1.2MHz, and includes 0.42ΩP-channel driver transistor and 0.52ΩN-channel switching transistor. As forqdA嘉泰姆
operation mode, the CXDC65105XCL series is PWM control, the CXDC65106XCL series is automatic PWM/PFMqdA嘉泰姆
switching control, allowing fast response, low ripple and high efficiency over the full range of loads (from lightqdA嘉泰姆
load to heavy load).During stand-by, the device is shutdown to reduce current consumption to as low as 1.0μAqdA嘉泰姆
or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFFqdA嘉泰姆
when input voltage becomes 1.4V or lower.The series provide short-time turn-on by the soft start functionqdA嘉泰姆
internally set in 0.25ms (TYP). The series integrate CL auto discharge function which enables the electricqdA嘉泰姆
charge stored at the output capacitor CL to be discharged via the internal auto-discharge switch locatedqdA嘉泰姆
between the LX and VSS pins. When the devices enter stand-by mode, output voltage quickly returnsqdA嘉泰姆

to the VSS level as a result of this functionqdA嘉泰姆
二.产品特点(Features)qdA嘉泰姆
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Ultra Small : 2.5mm×2.0mm, h=1.0mmqdA嘉泰姆

Input Voltage : 2.0V ~ 6.0V qdA嘉泰姆

Output Voltage : 0.8V ~ 4.0V (±2.0%) qdA嘉泰姆

High Efficiency : 92%(VIN=4.2V,VOUT=3.3V)qdA嘉泰姆

Output Current : 400mA qdA嘉泰姆

Oscillation Frequency : 1.2MHz (±15%) qdA嘉泰姆

Maximum Duty Cycle : 100% qdA嘉泰姆

Output Capacitor : Low ESR Ceramic qdA嘉泰姆

Function : Current Limiter Circuit (Constant Current & Latching) qdA嘉泰姆

       Soft-Start Circuit Built-In CL Discharge qdA嘉泰姆

Control Methods : PWM (CXDC65105) qdA嘉泰姆

            PWM/PFM Auto (CXDC65106) qdA嘉泰姆

Operating Ambient Temperature : -40℃～+85℃ qdA嘉泰姆

Environmentally Friendly : EU RoHS Compliant, Pb FreeqdA嘉泰姆

三,应用范围 (Applications)qdA嘉泰姆
qdA嘉泰姆
●Mobile phones, Smart phonesqdA嘉泰姆
●Bluetooth HeadsetsqdA嘉泰姆
●WiMAX PDAs, MIDs, UMPCsqdA嘉泰姆
●Portable game consolesqdA嘉泰姆
●Digital cameras, CamcordersqdA嘉泰姆
●SSD(Solid State Drive)qdA嘉泰姆
●PND(Portable Navigation Device)qdA嘉泰姆
四.技术规格书下载（产品PDF）qdA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！qdA嘉泰姆

 qdA嘉泰姆

五,产品封装图 (Package)qdA嘉泰姆
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Inductor ElectrodesqdA嘉泰姆

六.电路原理图qdA嘉泰姆

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七,功能概述qdA嘉泰姆

The CXDC65105XCL/CXDC65106XCL series consists of a reference voltage source, ramp wave circuit, error amplifier,qdA嘉泰姆

PWM comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOSFET driverqdA嘉泰姆
transistor, N-channel MOSFET switching transistor for the synchronous switch, current limiter circuit, UVLO circuitqdA嘉泰姆
with control IC, and an inductor. (See the block diagram below.) Using the error amplifier, the voltage of the internalqdA嘉泰姆
voltage reference source is compared with the feedback voltage from the VOUT pin through split resistors, R1 and R2.qdA嘉泰姆
Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator toqdA嘉泰姆
determine the turn-on time during PWM operation. The PWM comparator compares, in terms of voltage level, theqdA嘉泰姆
signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output toqdA嘉泰姆
the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is continuously performedqdA嘉泰姆
to ensure stable output voltage.The current feedback circuit monitors the P-channel MOS driver transistorqdA嘉泰姆

current for each switching operation, and modulates the error amplifier output signal to provide multiple feedbackqdA嘉泰姆
signals. This enables a stable feedback loop even when a low ESR capacitor such as a ceramic capacitor is usedqdA嘉泰姆
ensuring stable output voltageqdA嘉泰姆
八,相关芯片选择指南              更多同类产品.......qdA嘉泰姆
qdA嘉泰姆

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下一篇▶:CXDC65106线圈和控制IC组成一体的超小型降压DC/DC转换器输出电压0.8～4.0V开关频率1.2MHz内置0.42ΩPch驱动晶体管0.52ΩNch开关晶体管的同步整流方式

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