The CXMD3255 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The CXMD3255 allows wide input voltage that is either a single 5~12V or two supply voltage(s) for various applications. A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. A builtin soft-start circuit prevents the output voltages from overshoot as well as limits the input current. An internal 0.8V temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low output voltage applications. The CXMD3255 provides excellent output voltage regulations against load current variation.
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[ CXMD3255 ]"
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产品概述 返回TOP
The CXMD3255 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The CXMD3255 allows wide input voltage that is either a single 5~12V or two supply voltage(s) for various applications. A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. A builtin soft-start circuit prevents the output voltages from overshoot as well as limits the input current. An internal 0.8V temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low output voltage applications. The CXMD3255 provides excellent output voltage regulations against load current variation. The controller’s over-current protection monitors the output current by using the voltage drop across the RDS(ON) of low-side MOSFET, eliminating the need for a current sensing resistor that features high efficiency and low cost. In addition, the CXMD3255 also integrates excellent protection functions: The over-voltage protection (OVP) , under- voltage protection (UVP). OVP circuit which monitors the FB voltage to prevent the PWM output from overvoltage,and UVP circuit which monitors the FB voltage to prevent the PWM output from under-voltage or short-circuit.The CXMD3255is available in SOP-8P and TDFN3x3-10 packages.
产品特点 返回TOP
l Wide 5V to 16V Supply Voltage
l Power-On-Reset Monitoring on VCC
l Excellent Output Voltage Regulations 0.8V
Internal Reference ±1% Over-Temperature Range
l Integrated Soft-Start
l Voltage Mode PWM Operation with External Compensation
l Up to 90% Duty Ratio for Fast Transient Response
l Constant Switching Frequency 300kHz ±10%
l Drive Dual Low Cost N-MOSFETs with Adaptive Dead-Time Control
l 50% Under-Voltage Protection
l 125% Over-Voltage Protection
l Adjustable Over-Current Protection Threshold Using the RDS(ON) of Low-Side MOSFET
l Shutdown Control by COMP
l Power Good Monitoring (TDFN-10 3mmx3mm Package Only)
l SOP-8P and TDFN3x3-10 Packages
l Lead Free and Green Devices Available (RoHS Compliant
应用范围 返回TOP
Graphic Cards
DSL, Switch HUB
Wireless Lan
Notebook Computer
Mother Board
LCD Monitor/TV
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产品封装图 返回TOP
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PWM Controller(脉宽调制控制器) |
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Part No. |
Input Voltage |
Output Voltage |
Frequency |
Efficiency |
Package |
precision |
Over |
Over |
Short Protection |
|
Current |
Temperature |
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|
Protection |
Protection |
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|
16V |
ADJ |
300KHZ |
93% |
SOP8/DFN3*3-10DFN3*3-10 |
2% |
Y |
Y |
Y |
|
|
16V |
ADJ |
200KHz/300KHZ /600KHz |
93% |
SOP8 DFN3*3-10 |
2% |
Y |
Y |
Y |
|
|
35V |
ADJ |
290-430KHz |
93% |
DFN3*3-10 |
2% |
Y |
Y |
Y |
|
|
35V |
ADJ |
290-430KHz |
93% |
DFN3*3-10 |
2% |
Y |
Y |
Y |
|
|
35V |
ADJ |
135-215KHz |
93% |
DFN3*3-10 |
2% |
Y |
Y |
Y |
|
|
35V |
ADJ |
135-215KHz |
93% |
DFN3*3-10 |
2% |
Y |
Y |
Y |
|
|
40V |
- |
100-300KHz |
- |
QFN20 |
Y |
Y |
Y |
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