目录ICI嘉泰姆

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

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

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

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

二.产品特点(Features)ICI嘉泰姆

1.)0.9V Typical Start-up Input VoltageICI嘉泰姆
2.)11μA Typical No Load Quiescent CurrentICI嘉泰姆
3.)PFM OperationICI嘉泰姆
4.)High Efficiency up to 92%ICI嘉泰姆
5.)Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5VICI嘉泰姆
6.)Output VoltageICI嘉泰姆
7.)600mA Internal Switch CurrentICI嘉泰姆
8.)Internal Synchronous RectifierICI嘉泰姆
9.)SOT-89 PackageICI嘉泰姆
10.)Lead Free and Green Devices AvailableICI嘉泰姆
(RoHS Compliant)ICI嘉泰姆
三,应用范围 (Applications)ICI嘉泰姆

ToyICI嘉泰姆

Wireless MouseICI嘉泰姆
Portable InstrumentICI嘉泰姆
四.下载产品资料PDF文档 ICI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！ICI嘉泰姆

 ICI嘉泰姆

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

ICI嘉泰姆
七,功能概述ICI嘉泰姆

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

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

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

共有条评论 用户名: 密码: 验证码: 匿名发表