CXDC65105同步降压型微型DC变换器感应器和控制IC集成在小封装中输出电流400毫安内置CL放电软启动电路

CXDC65105系列是一种同步降压型微型DC/DC变换器将感应器和控制IC集成在一个小封装中（2.5毫米×2.0毫米，h=1.0毫米）。稳定的力量输出电流为400毫安的电源仅使用两个外部连接的电容器进行配置。工作电压范围为2.0V至6.0V。输出电压内部设置在0.8V到4.0V的范围内，增量为0.05V。该装置运行由1.2兆赫，并包括0.42欧P通道驱动晶体管和0.52欧N通道开关晶体管。至于工作模式，CXDC65105XCL系列为脉宽调制控制，CXDC65106XCL系列为自动脉宽调制/功率因数调制开关控制，允许快速响应，低纹波和高效率的全范围负载（从轻在待机状态下，关闭设备以将电流消耗降低至1.0μA或者更少。内置UVLO（欠压锁定）功能，内部驱动晶体管被强制关闭当输入电压变为1.4V或更低时。该系列通过软启动功能提供短时开启内部设置为0.25ms（典型值）。系列集成的CL自动放电功能储存在输出电容器CL处的电荷，通过位于在LX和VSS引脚之间。当设备进入待机模式时，输出电压迅速返回作为此函数的结果，设置为VSS级别

目录

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                     6.电路原理图                   
7.功能概述                        8.相关产品

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.

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 returns

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

Ultra Small : 2.5mm×2.0mm, h=1.0mm

Input Voltage : 2.0V ~ 6.0V 

Output Voltage : 0.8V ~ 4.0V (±2.0%) 

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

Output Current : 400mA 

Oscillation Frequency : 1.2MHz (±15%) 

Maximum Duty Cycle : 100% 

Output Capacitor : Low ESR Ceramic 

Function : Current Limiter Circuit (Constant Current & Latching) 

       Soft-Start Circuit Built-In CL Discharge 

Control Methods : PWM (CXDC65105) 

            PWM/PFM Auto (CXDC65106) 

Operating Ambient Temperature : -40℃～+85℃ 

Environmentally Friendly : EU RoHS Compliant, Pb Free

三,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.技术规格书下载（产品PDF）

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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！

 

五,产品封装图 (Package)


Inductor Electrodes

PIN NUMBER	PIN NAME	FUNCTIONS
1	Lx	Switching Output
2,5	VSS	Ground
3	VOUT	Output Voltage
4	CE	Chip Enable
6	VIN	Power Input
7	L1	Inductor Electrodes
8	L2

六.电路原理图

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七,功能概述

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

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 transistor

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.......

线圈一体型DC/DC转换器
产品名称	封装	类型	控制	FET	VIN (MIN) (V)	VIN MAX (V)	VOUT MIN V	VOUT MAX  V	IOUTorIIN  mA	FB/VOUT 电压精度 (%)	振荡频率 (MHz)	消耗电流 (μA)
CXDC65102	cl2025 cl2025-02	StepUP	PFM	Nch FET Pch FET	0.9	5.5	2	5	100	±2.0	1.2	6.3
CXDC65103	cl2025-02	升压	PWM	Nch FET Pch FET	0.9	6	2	5.5	500mA@VOUT=5.0V, VBAT=3.3V(TYP.) 350mA@VOUT=3.3V,  VBAT=1.8V(TYP.)	±2.0	3
CXDC65104	cl2025-02	升压	Auto PWM/PFM	Nch FET Pch FET	0.9	6	2	5.5	500mA@VOUT=5.0V, VBAT=3.3V(TYP.) 350mA@VOUT=3.3V,  VBAT=1.8V(TYP.)	±2.0	3
CXDC65105	cl2025 cl2025-02	StepDown	PWM	Nch FET Pch FET	2	6	1	4	400	±2.0	1.2	22
CXDC65106	cl2025 cl2025-02	StepDown	PWM PFM	Nch FET Pch FET	2	6	1	4	400	±2.0	1.2	22
CXDC65107	cl2025 cl2025-02	StepDown	PWM	Nch FET Pch FET	2	6	1	4	600	±2.0	3	46
CXDC65108	cl2025 cl2025-02	StepDown	PWM/PFM	Nch FET Pch FET	2	6	1	4	600	±2.0	3	21
CXDC65109	cl2025 cl2025-02	StepDown	PWM/PFM 外部转换	Nch FET Pch FET	2	6	1	4	600	±2.0	3	21
CXDC65110	usp10b03	StepDown	PWM	Nch FET Pch FET	1.8	6	1	4	400	±2.0	3	46
CXDC65111	usp10b03	StepDown	PWM PFM	Nch FET Pch FET	1.8	6	1	4	400	±2.0	3	21
CXDC65112	cl2025-02	StepDown	PFM	Nch FET Pch FET	2	6	1	4	200	±2.0	3	0.5
CXDC65113	usp11b01	StepDown	PWM	Nch FET Pch FET	2.7	6	1	VIN	2000	±2.0	2.4	53
CXDC65114	usp11b01	StepDown	PWM PFM	Nch FET Pch FET	2.7	6	1	VIN	2000	±2.0	2.4	53
CXDC65115	usp9b01	StepDown	PWM	Nch FET Pch FET	2.7	5.5	1	3.6	1500	±2.0	3	400
CXDC65116	usp9b01	StepDown	PWM PFM	Nch FET Pch FET	2.7	5.5	1	3.6	1500	±2.0	3	25
CXDC65117	cl2025-02	StepDown	PWM	Nch FET Pch FET	2.5	5.5	1	3.6	1000		3	400
CXDC65118	cl2025-02	StepDown	PWM PFM	Nch FET Pch FET	2.5	5.5	1	3.6	1000		3	40
CXDC65119	cl2025-02	StepDown	PWM	Nch FET Pch FET	2.5	5.5	1	3.6	500		1.2	250
CXDC65120	cl2025-02	StepDown	PWM/PFM	Nch FET Pch FET	2.5	5.5	1	3.6	500		1.2	1