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
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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）
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
七,功能概述
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 |
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|
产品名称 |
封装 |
类型 |
控制 |
FET |
VIN (MIN) (V) |
VIN MAX |
VOUT MIN V |
VOUT MAX V |
IOUTorIIN mA |
FB/VOUT 电压精度 (%) |
振荡频率 (MHz) |
消耗电流 (μA) |
|
cl2025 |
StepUP |
PFM |
Nch FET |
0.9 |
5.5 |
2 |
5 |
100 |
±2.0 |
1.2 |
6.3 |
|
|
cl2025-02 |
升压 |
PWM |
Nch 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 |
||
|
cl2025-02 |
升压 |
Auto PWM/PFM |
Nch FET |
0.9 |
6 |
2 |
5.5 |
500mA@VOUT=5.0V, VBAT=3.3V(TYP.) VBAT=1.8V(TYP.) |
±2.0 |
3 |
||
|
cl2025 |
StepDown |
PWM |
Nch FET |
2 |
6 |
1 |
4 |
400 |
±2.0 |
1.2 |
22 |
|
|
cl2025 |
StepDown |
PWM PFM |
Nch FET |
2 |
6 |
1 |
4 |
400 |
±2.0 |
1.2 |
22 |
|
|
cl2025 |
StepDown |
PWM |
Nch FET |
2 |
6 |
1 |
4 |
600 |
±2.0 |
3 |
46 |
|
|
cl2025 |
StepDown |
PWM/PFM |
Nch FET |
2 |
6 |
1 |
4 |
600 |
±2.0 |
3 |
21 |
|
|
cl2025 |
StepDown |
PWM/PFM 外部转换 |
Nch FET |
2 |
6 |
1 |
4 |
600 |
±2.0 |
3 |
21 |
|
|
usp10b03 |
StepDown |
PWM |
Nch FET |
1.8 |
6 |
1 |
4 |
400 |
±2.0 |
3 |
46 |
|
|
usp10b03 |
StepDown |
PWM PFM |
Nch FET |
1.8 |
6 |
1 |
4 |
400 |
±2.0 |
3 |
21 |
|
|
cl2025-02 |
StepDown |
PFM |
Nch FET |
2 |
6 |
1 |
4 |
200 |
±2.0 |
3 |
0.5 |
|
|
usp11b01 |
StepDown |
PWM |
Nch FET |
2.7 |
6 |
1 |
VIN |
2000 |
±2.0 |
2.4 |
53 |
|
|
usp11b01 |
StepDown |
PWM PFM |
Nch FET |
2.7 |
6 |
1 |
VIN |
2000 |
±2.0 |
2.4 |
53 |
|
|
usp9b01 |
StepDown |
PWM |
Nch FET |
2.7 |
5.5 |
1 |
3.6 |
1500 |
±2.0 |
3 |
400 |
|
|
usp9b01 |
StepDown |
PWM PFM |
Nch FET |
2.7 |
5.5 |
1 |
3.6 |
1500 |
±2.0 |
3 |
25 |
|
|
cl2025-02 |
StepDown |
PWM |
Nch FET |
2.5 |
5.5 |
1 |
3.6 |
1000 |
3 |
400 |
||
|
cl2025-02 |
StepDown |
PWM PFM |
Nch FET Pch FET |
2.5 |
5.5 |
1 |
3.6 |
1000 |
3 |
40 |
||
|
cl2025-02 |
StepDown |
PWM |
Nch FET |
2.5 |
5.5 |
1 |
3.6 |
500 |
1.2 |
250 |
||
|
cl2025-02 |
StepDown |
PWM/PFM |
Nch FET |
2.5 |
5.5 |
1 |
3.6 |
500 |
1.2 |
1 |
||
