目录wfC嘉泰姆

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

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

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

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

二.产品特点(Features)wfC嘉泰姆

1.)0.9V Typical Start-up Input VoltagewfC嘉泰姆
2.)11μA Typical No Load Quiescent CurrentwfC嘉泰姆
3.)PFM OperationwfC嘉泰姆
4.)High Efficiency up to 92%wfC嘉泰姆
5.)Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5VwfC嘉泰姆
6.)Output VoltagewfC嘉泰姆
7.)600mA Internal Switch CurrentwfC嘉泰姆
8.)Internal Synchronous RectifierwfC嘉泰姆
9.)SOT-89 PackagewfC嘉泰姆
10.)Lead Free and Green Devices AvailablewfC嘉泰姆
(RoHS Compliant)wfC嘉泰姆
三,应用范围 (Applications)wfC嘉泰姆

ToywfC嘉泰姆

Wireless MousewfC嘉泰姆
Portable InstrumentwfC嘉泰姆
四.下载产品资料PDF文档 wfC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！wfC嘉泰姆

 wfC嘉泰姆

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

wfC嘉泰姆
七,功能概述wfC嘉泰姆

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

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

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