目录U9k嘉泰姆

1.产品概述                       2.产品特点U9k嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 U9k嘉泰姆
5.产品封装图                     6.电路原理图                   U9k嘉泰姆
7.功能概述                        8.相关产品U9k嘉泰姆

一,产品概述(General Description)   U9k嘉泰姆

  The CXSD62122 is a 5A, synchronous, step-down converter with integrated 50mΩ P-channel power MOSFET and 20mΩ N-channel power MOSFET.The device, with cur-rent-mode control scheme, can convert 4.5~26V input volt-age to the output voltage adjustable from 0.8 to 90% VIN to provide excellent output voltage regulation.U9k嘉泰姆
  The CXSD62122 regulates the output voltage in an auto-matic PSM/PWM mode operation, depending on the out-put current, for high efficiency operation over light to full load current. The CXSD62122 is also equipped with power-U9k嘉泰姆
on-reset, soft-start, and whole protections (including over- voltage, under-voltage, over-temperature, and current-limit) in a single package. In shutdown mode, the supply current drops below 5μA.This device, available in 28-pin TQFN5x6 package, pro-vides a very compact system solution with minimal exter-U9k嘉泰姆
nal components and good thermal conductance.U9k嘉泰姆
二.产品特点(Features)U9k嘉泰姆

Wide Input Voltage from 4.5V to 26VU9k嘉泰姆
Output Current Up to 5AU9k嘉泰姆
Adjustable Output Voltage from 0.8V to 90%VINU9k嘉泰姆
- 0.8V Reference VoltageU9k嘉泰姆
- ±2.5% System AccuracyU9k嘉泰姆
Integrated 50mΩ P-Channel Power MOSFET andU9k嘉泰姆
20mΩ N-Channel Power MOSFETU9k嘉泰姆
High Efficiency up to 95%U9k嘉泰姆
Current-Mode OperationU9k嘉泰姆
- Stable with Ceramic Output CapacitorsU9k嘉泰姆
- Fast Transient ResponseU9k嘉泰姆
Power-On-Reset MonitoringU9k嘉泰姆
Fixed 380kHz Switching Frequency in PWM ModeU9k嘉泰姆
Automatic Pulse-Skipping Mode (PSM)/PWMU9k嘉泰姆
Mode OperationU9k嘉泰姆
Built-in Digital Soft-StartU9k嘉泰姆
Output Current-Limit Protection with FrequencyU9k嘉泰姆
FoldbackU9k嘉泰姆
·70% Under-Voltage ProtectionU9k嘉泰姆
·Over-Temperature ProtectionU9k嘉泰姆
·118% Over-Voltage ProtectionU9k嘉泰姆
·<5μA Quiescent Current During ShutdownU9k嘉泰姆
·Thermal-Enhanced TQFN5x6-28 PackageU9k嘉泰姆
·Pb-Free Available as an OptionU9k嘉泰姆
·Lead Free and Green Devices AvailableU9k嘉泰姆
(RoHS Compliant)U9k嘉泰姆
三,应用范围 (Applications)U9k嘉泰姆

LCD Monitor / TVU9k嘉泰姆

SetTop BoxU9k嘉泰姆
Portable DVDU9k嘉泰姆
Wireless LANU9k嘉泰姆
ADSL, Switch HUBU9k嘉泰姆
Notebook ComputerU9k嘉泰姆
Step-Down Converters Requiring High EfficiencyU9k嘉泰姆
and 5A Output CurrentU9k嘉泰姆

四.下载产品资料PDF文档 U9k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！U9k嘉泰姆

 U9k嘉泰姆

五,产品封装图 (Package)U9k嘉泰姆

U9k嘉泰姆

六.电路原理图U9k嘉泰姆

U9k嘉泰姆

七,功能概述U9k嘉泰姆

Inductor Value CalculationU9k嘉泰姆
The operating frequency and inductor selection are inter-related in that higher operating frequencies permitU9k嘉泰姆

the use of a smaller inductor for the same amount of inductor ripple current. However, this is at the expenseU9k嘉泰姆

 of efficiency due to an increase in MOSFET gate charge losses. The equation (2) shows that the inductanceU9k嘉泰姆

value has a direct effect on ripple current.Accepting larger values of ripple current allows the use of lowU9k嘉泰姆

 inductances, but results in higher output voltage rippleU9k嘉泰姆
Layout ConsiderationU9k嘉泰姆
In high power switching regulator, a correct layout is im-portant to ensure proper operation of the regulator.U9k嘉泰姆

In general, interconnecting impedance should be minimized by using short, wide printed circuit traces. SignalU9k嘉泰姆

 and power grounds are to be kept separating and finally com-bined using ground plane construction or singleU9k嘉泰姆

 point grounding. Figure 2 illustrates the layout, with bold lines indicating high current paths. ComponentsU9k嘉泰姆

 along the bold lines should be placed close together. The following is a checklist for your layout:U9k嘉泰姆
1. Firstly, to initial the layout by placing the power components. Orient the power circuitry to achieve a cleanU9k嘉泰姆
power flow path. If possible, make all the connections on one side of the PCB with wide, copper filled areas.U9k嘉泰姆
2. In Figure 2, the loops with the same color bold lines conduct high slew rate current. These interconnectingU9k嘉泰姆
impedances should be minimized by using wide, short printed circuit traces.U9k嘉泰姆
3. Keep the sensitive small signal nodes (FB, COMP) away from switching nodes (LX or others) on the PCB.U9k嘉泰姆
Therefore, place the feedback divider and the feedback compensation network close to the IC to avoid switchingU9k嘉泰姆
noise. Connect the ground of feedback divider directly to the GND pin of the IC using a dedicated ground trace.U9k嘉泰姆
4. The VCC decoupling capacitor should be right next to the VCC and GND pins. Capacitor C2 should be connectedU9k嘉泰姆
as close to the VIN and UGND pins as possible.U9k嘉泰姆
5. Place the decoupling ceramic capacitor C1 near the VIN as close as possible. The bulk capacitors C8 are alsoU9k嘉泰姆
placed near VIN. Use a wide power ground plane to con- nect the C1, C8, and C4 to provide a low impedanceU9k嘉泰姆
八,相关产品                 更多同类产品.......U9k嘉泰姆

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