• [ CXSU63139 ]

样品申请

目录zCT嘉泰姆

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

一,产品概述(General Description)         zCT嘉泰姆

      The CXSU63139 is a synchronous rectifier, fixed switching frequency (1.2MHz typical), andzCT嘉泰姆
current-mode step-up regulator. The device allows use of small inductors and output capacitors for USB devices. The current-mode control scheme provides fast transient response and good output voltage accuracy.At light loads, the CXSU63139 will automatically enter in Pulse Frequency Modulation (PFM) operation to reduce the dominant switching losses. During PFM operation,the IC consumes very low quiescent current and maintains high efficiency over the complete load range.zCT嘉泰姆
      The CXSU63139 also includes current-limit and over-temperature shutdown to prevent damagezCT嘉泰姆
in the event of an output overload.zCT嘉泰姆
      The CXSU63139 is available in 4mmx4mm TQFN4x4-16 and DFN3x3-12 packages.zCT嘉泰姆
二.产品特点(Features)zCT嘉泰姆

1.)92% Effiicency Synchronous Boost Converter With 1000-mA Output Current FromzCT嘉泰姆
      1.8V InputzCT嘉泰姆
2.)Stable with Low ESR Output CapacitorszCT嘉泰姆
3.)Fixed 1.2MHz Oscillator FrequencyzCT嘉泰姆
4.)Low EMI Converter (Integrated Anti-Ringing Function)zCT嘉泰姆
5.)Low Battery OutputzCT嘉泰姆
6.)Integrated Power Save Mode Operation to Improve Light Load EfficiencyzCT嘉泰姆
7.)Load Disconnected During ShutdownzCT嘉泰姆
8.)Output Current-Limit ProtectionzCT嘉泰姆
9.)Over Temperature ProtectionzCT嘉泰姆
10.)Under Voltage ProtectionzCT嘉泰姆
11.)Enable/Shutdown FunctionzCT嘉泰姆
12.)Available in TQFN4x4-16 and DFN3x3-12 PackageszCT嘉泰姆
13.)Lead Free and Green Devices Available (RoHS Compliant)zCT嘉泰姆
三,应用范围 (Applications)zCT嘉泰姆

Power BankzCT嘉泰姆
TabletzCT嘉泰姆
Portable EquimentzCT嘉泰姆
四.下载产品资料PDF文档 zCT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！zCT嘉泰姆

 zCT嘉泰姆

五,产品封装图 (Package)zCT嘉泰姆

zCT嘉泰姆

六.电路原理图zCT嘉泰姆

zCT嘉泰姆

七,功能概述zCT嘉泰姆

Main Control LoopzCT嘉泰姆

The CXSU63139 is a constant frequency, synchronous rectifier, and current-mode switching regulator. zCT嘉泰姆

In normal operation, the internal N-channel power MOSFET is turned on each cycle when the oscillatorzCT嘉泰姆

 sets an internal RS latch and turned off when an internal comparator (ICMP) resets the latch. The peakzCT嘉泰姆

 inductor current which ICMP resets the RS latch is controlled by the voltage on the COMP node, which zCT嘉泰姆

is the output of the error amplifier (EAMP). An external resistive divider connected between VOUT and zCT嘉泰姆

ground allows the EAMP to receive an output feedback voltage VFB at FB pin. When the load current zCT嘉泰姆

increases, it causes a slightly decrease in VFB relative to the 0.5V reference, which in turn causes thezCT嘉泰姆

 COMP volt- age to increase until the average inductor current matches the new load current.zCT嘉泰姆
 Start-upzCT嘉泰姆
A start-up oscillator circuit is integrated in the CXSU63139.When the device enables, the circuit pumpszCT嘉泰姆

 the output voltage high. Once the output voltage reaches 1.6V (typ),the main DC-DC circuitry turns onzCT嘉泰姆

 and boosts the output voltage to the final regulation voltage. zCT嘉泰姆
Automatic PFM/PWM mode SwitchzCT嘉泰姆
The CXSU63139 is a fixed frequency PWM peak current modulation control step-up converter. At lightzCT嘉泰姆

 loads, theCXSU63139 will automatically enter in pulse frequency modulation operation to reduce the zCT嘉泰姆

dominant switching losses. In PFM operation, the inductor current may reach zero or reverse on eachzCT嘉泰姆

 pulse. A zero current comparator turns off the P-channel synchronous MOSFET, forcing DCM(DiscontinuouszCT嘉泰姆

 Current Mode) operation at light load.These controls get very low quiescent current, help to maintain zCT嘉泰姆

high efficiency over the complete load range. zCT嘉泰姆
Synchronous RectificationzCT嘉泰姆
The internal synchronous rectifier eliminates the need for an external Schottky diode, thus reducing costzCT嘉泰姆

 and board space. During the cycle off-time, the P-FET turns on and shunts the FET body diode. As a zCT嘉泰姆

result, the syn-chronous rectifier significantly improves efficiency with-out the addition of an externalzCT嘉泰姆

 component. Conversion efficiency can be as high as 92%.zCT嘉泰姆
Load DisconnectzCT嘉泰姆
Driving EN to ground places the CXSU63139 in shutdown mode. When in shutdown, the internal powerzCT嘉泰姆

 MOSFET turns off, all internal circuitry shuts down and the quies-cent supply current reduces to 1μAzCT嘉泰姆

 maximum.A special circuit is applied to disconnect the load from the input during shutdown the zCT嘉泰姆

converter. In conventional syn-chronous rectifier circuits, the back-gate diode of the high-side P-FET zCT嘉泰姆

is forward biased in shutdown and allows current flowing from the battery to the output. However,thiszCT嘉泰姆

 device uses a special circuit, which takes the cath-ode of the back-gate diode of the high-side P-FETzCT嘉泰姆

 and disconnects it from the source when the regulator is shutdown. The benefit of this feature for zCT嘉泰姆

the system de-sign engineer is that the battery is not depleted during shutdown of the converter.  zCT嘉泰姆

No additional componentsmust be added to the design to make sure that the bat-tery is disconnectedzCT嘉泰姆

 from the output of the converter. zCT嘉泰姆
Current-Limit ProtectionzCT嘉泰姆
The CXSU63139 monitors the inductor current, flowing through the N-FET, and  limits the current zCT嘉泰姆

peak at current-limit level to prevent loads and the CXSU63139 from dam-ages during overloadzCT嘉泰姆

 conditions.zCT嘉泰姆
Over-Temperature Protection (OTP)zCT嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSU63139. When the junctionzCT嘉泰姆

 temperature ex-ceeds 150oC, a thermal sensor turns off the both N-FETand P-FET, allowing the zCT嘉泰姆

devices to cool. The thermal sensor allows the converters to start a soft-start process and regulatezCT嘉泰姆

 the output voltage again after the junction temperature cools by 30oC. The OTP is designed with zCT嘉泰姆

a 30oC hysteresis to lower the average Junction Tempera-ture (TJ) during continuous thermal overload conditions,increasing the lifetime of the device.zCT嘉泰姆

八,相关产品                 更多同类产品......zCT嘉泰姆

zCT嘉泰姆

◀ 上一篇:6A功率MOSFET可输出5V 3.4A的锂电池输入CXSU63129 CXSU63129B主开关采用NMOS同步开关采用PMOS软启动

返回顶部

下一篇▶:自动进入脉冲频率调制PFM CXSU63141同步整流器固定开关频率1MHz电流模式升压调节器内同步整流器效率高达92%

共有条评论 用户名: 密码: 验证码: 匿名发表