Inductor Built-in CXDC65105XCL/CXDC65105XCL synchronous step-down micro DC/DC converter which integrates an inductor A stable power supply with an output current of 400mA is configured using

目录8WY嘉泰姆

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

一,产品概述(General Description)      

   The CXDC65105XCL/CXDC65105XCL series is a synchronous step-down micro DC/DC converter which
integrates an inductor and  a control IC in one tiny package (2.5mm×2.0mm, h=1.0mm). A stable power
supply with an output current of 400mA is configured using only two capacitors connected externally.
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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 operated
by 1.2MHz, and includes 0.42ΩP-channel driver transistor and 0.52ΩN-channel switching transistor. As for
operation mode, the CXDC65105XCL series is PWM control, the CXDC65106XCL series is automatic PWM/PFM
switching control, allowing fast response, low ripple and high efficiency over the full range of loads (from light
load to heavy load).During stand-by, the device is shutdown to reduce current consumption to as low as 1.0μA
or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF
when input voltage becomes 1.4V or lower.The series provide short-time turn-on by the soft start function
internally set in 0.25ms (TYP). The series integrate CL auto discharge function which enables the electric
charge stored at the output capacitor CL to be discharged via the internal auto-discharge switch located
between the LX and VSS pins. When the devices enter stand-by mode, output voltage quickly returns8WY嘉泰姆

to the VSS level as a result of this function
二</span>.产品特点(Features)

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Ultra Small : 2.5mm×2.0mm, h=1.0mm8WY嘉泰姆

Input Voltage : 2.0V ~ 6.0V 8WY嘉泰姆

Output Voltage : 0.8V ~ 4.0V (±2.0%) 8WY嘉泰姆

High Efficiency : 92%(VIN=4.2V,VOUT=3.3V)8WY嘉泰姆

Output Current : 400mA 8WY嘉泰姆

Oscillation Frequency : 1.2MHz (±15%) 8WY嘉泰姆

Maximum Duty Cycle : 100% 8WY嘉泰姆

Output Capacitor : Low ESR Ceramic 8WY嘉泰姆

Function : Current Limiter Circuit (Constant Current & Latching) 8WY嘉泰姆

       Soft-Start Circuit Built-In CL Discharge 8WY嘉泰姆

Control Methods : PWM (CXDC65105) 8WY嘉泰姆

            PWM/PFM Auto (CXDC65106) 8WY嘉泰姆

Operating Ambient Temperature : -40℃～+85℃&nbsp;8WY嘉泰姆

Environmentally Friendly : EU RoHS Compliant, Pb Free8WY嘉泰姆

三</span>,应用范围 (Applications)

●Mobile phones, Smart phones
●Bluetooth Headsets
●WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
●Digital cameras, Camcorders
●SSD(Solid State Drive)
●PND(Portable Navigation Device)
四.技术</span>规格书下载（产品PDF）</span>8WY嘉泰姆

五,产品封装图 (Package)


Inductor Electrodes
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六.电路原理图</span>8WY嘉泰姆

七</span>,功能概述8WY嘉泰姆

The CXDC65105XCL/CXDC65106XCL series consists of a reference voltage source, ramp wave circuit, error amplifier,
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PWM comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOSFET driver
transistor, N-channel MOSFET switching transistor for the synchronous switch, current limiter circuit, UVLO circuit
with control IC, and an inductor. (See the block diagram below.) Using the error amplifier, the voltage of the internal
voltage reference source is compared with the feedback voltage from the VOUT pin through split resistors, R1 and R2.
Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator to
determine the turn-on time during PWM operation. The PWM comparator compares, in terms of voltage level, the
signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to
the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is continuously performed
to ensure stable output voltage.The current feedback circuit monitors the P-channel MOS driver transistor8WY嘉泰姆

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