目录tmG嘉泰姆

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

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

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

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

二.产品特点(Features)tmG嘉泰姆

1.)0.9V Typical Start-up Input VoltagetmG嘉泰姆
2.)11μA Typical No Load Quiescent CurrenttmG嘉泰姆
3.)PFM OperationtmG嘉泰姆
4.)High Efficiency up to 92%tmG嘉泰姆
5.)Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5VtmG嘉泰姆
6.)Output VoltagetmG嘉泰姆
7.)600mA Internal Switch CurrenttmG嘉泰姆
8.)Internal Synchronous RectifiertmG嘉泰姆
9.)SOT-89 PackagetmG嘉泰姆
10.)Lead Free and Green Devices AvailabletmG嘉泰姆
(RoHS Compliant)tmG嘉泰姆
三,应用范围 (Applications)tmG嘉泰姆

ToytmG嘉泰姆

Wireless MousetmG嘉泰姆
Portable InstrumenttmG嘉泰姆
四.下载产品资料PDF文档 tmG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！tmG嘉泰姆

 tmG嘉泰姆

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

tmG嘉泰姆
七,功能概述tmG嘉泰姆

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

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

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