目录Duf嘉泰姆

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

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

The CXSU63133 is a compact, PFM mode, and step-upDuf嘉泰姆

DC-DC converter with low quiescent current. The inter-Duf嘉泰姆
nal synchronous rectifier reduces cost and PCB spaceDuf嘉泰姆
by eliminating the need for an external Schottky diode.Duf嘉泰姆
Low on-resistance of the internal switches improves theDuf嘉泰姆
efficiency up to 92%. The start-up voltage is guaranteedDuf嘉泰姆
below 1V. After start-up, the device can operate with inputDuf嘉泰姆
voltage down to 0.7V. The CXSU63133 is suitable for por-Duf嘉泰姆
table battery-powered applications. Consuming only 11μADuf嘉泰姆
quiescent current and an optimized control scheme al-Duf嘉泰姆
lows the device to operate at very high efficiency over theDuf嘉泰姆
entire load current range.Duf嘉泰姆

二.产品特点(Features)Duf嘉泰姆

1.)0.9V Typical Start-up Input VoltageDuf嘉泰姆
2.)11μA Typical No Load Quiescent CurrentDuf嘉泰姆
3.)PFM OperationDuf嘉泰姆
4.)High Efficiency up to 92%Duf嘉泰姆
5.)Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5VDuf嘉泰姆
6.)Output VoltageDuf嘉泰姆
7.)600mA Internal Switch CurrentDuf嘉泰姆
8.)Internal Synchronous RectifierDuf嘉泰姆
9.)SOT-89 PackageDuf嘉泰姆
10.)Lead Free and Green Devices AvailableDuf嘉泰姆
(RoHS Compliant)Duf嘉泰姆
三,应用范围 (Applications)Duf嘉泰姆

ToyDuf嘉泰姆

Wireless MouseDuf嘉泰姆
Portable InstrumentDuf嘉泰姆
四.下载产品资料PDF文档 Duf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！Duf嘉泰姆

 Duf嘉泰姆

五,产品封装图 (Package)Duf嘉泰姆
Duf嘉泰姆
六.电路原理图Duf嘉泰姆

Duf嘉泰姆
七,功能概述Duf嘉泰姆

Inductor SelectionDuf嘉泰姆
The inductor value determines the inductor ripple currentDuf嘉泰姆
and affects the load transient response. It is recom-Duf嘉泰姆
mended to select the boost inductor in order to keep theDuf嘉泰姆
maximum peak inductor current below the current limitDuf嘉泰姆
threshold of the power switch. For example, the currentDuf嘉泰姆
limit threshold of the CXSU63133’s switch is 600mA. ForDuf嘉泰姆
choosing an inductor which has peak current passed,Duf嘉泰姆
firstly, it is necessary to consider the output load (IOUT),Duf嘉泰姆
input (VIN), and output voltage (VOUT). Secondly, the de-Duf嘉泰姆
sired current ripple in the inductor also needed to beDuf嘉泰姆
taken into account. The current was calculated in “OutputDuf嘉泰姆
Capacitor Selection”. Since the output ripple is the prod-Duf嘉泰姆
uct of the peak inductor current and the output capacitorDuf嘉泰姆
ESR, the larger inductor value reduces the inductor cur-Duf嘉泰姆
rent ripple and output voltage ripple but typically offers aDuf嘉泰姆
larger physical size.Duf嘉泰姆

Control SchemeDuf嘉泰姆
The converter monitors the output voltage. When the in-Duf嘉泰姆
ternal feedback voltage falls below the reference voltage,Duf嘉泰姆
the main switch turns on and the inductor current rampsDuf嘉泰姆
up. The main switch turns off when the current reachesDuf嘉泰姆
the peak current limit of typical 600mA. The second crite-Duf嘉泰姆
rion that turns off the switch is the maximum on-time ofDuf嘉泰姆
4μs (typical). As the main switch is turned off, the syn-Duf嘉泰姆
chronous switch is turned on and delivers the current toDuf嘉泰姆
the output. The main switch remains off for a minimum ofDuf嘉泰姆
900ns (typical), or until the internal feedback voltage dropsDuf嘉泰姆
below the reference voltage. By the control scheme withDuf嘉泰姆
low quiescent current of 11μA (typical), the converter getsDuf嘉泰姆
high efficiency over a wide load range. Duf嘉泰姆
Start-UpDuf嘉泰姆
A startup oscillator circuit is integrated in the CXSU63133.Duf嘉泰姆
When the power is applied to the device, the circuit pumpsDuf嘉泰姆
the output voltage high. Once the output voltage reachesDuf嘉泰姆
1.4V (typ), the main DC-DC circuitry turns on and boostsDuf嘉泰姆
the output voltage to the final regulation point.Duf嘉泰姆
Synchronous RectificationDuf嘉泰姆
The internal synchronous rectifier eliminates the needDuf嘉泰姆
for an external Schottky diode, thus, reducing cost andDuf嘉泰姆
board space. During the cycle off-time, the P-channelDuf嘉泰姆
MOSFET turns on and shunts the MOSFET body diode.Duf嘉泰姆
As a result, the synchronous rectifier significantly improvesDuf嘉泰姆
efficiency without the addition of an external component.Duf嘉泰姆
Conversion efficiency can be as high as 92%. Duf嘉泰姆
Over-Temperature ProtectionDuf嘉泰姆
The over-temperature circuit limits the junction tempera-Duf嘉泰姆
ture of the CXSU63133. When the junction temperature ex-Duf嘉泰姆
ceeds 150°C, a thermal sensor turns off the powerDuf嘉泰姆
MOSFETs, allowing the devices to cool. The thermal sen-Duf嘉泰姆
sor allows the converter to start a start-up process andDuf嘉泰姆
regulate the output voltage again after the junction tem-Duf嘉泰姆
perature cools by 40°C. The OTP is designed with a 40°CDuf嘉泰姆
hysteresis to lower the average TJ during continuous ther-Duf嘉泰姆
mal overload conditions, increasing lifetime of the device.Duf嘉泰姆

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