目录x7V嘉泰姆

1.产品概述                       2.产品特点x7V嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 x7V嘉泰姆
5.产品封装图                     6.电路原理图                   x7V嘉泰姆
7.功能概述                        8.相关产品x7V嘉泰姆

一,产品概述(General Description)         x7V嘉泰姆

The CXSU63133 is a compact, PFM mode, and step-upx7V嘉泰姆

DC-DC converter with low quiescent current. The inter-x7V嘉泰姆
nal synchronous rectifier reduces cost and PCB spacex7V嘉泰姆
by eliminating the need for an external Schottky diode.x7V嘉泰姆
Low on-resistance of the internal switches improves thex7V嘉泰姆
efficiency up to 92%. The start-up voltage is guaranteedx7V嘉泰姆
below 1V. After start-up, the device can operate with inputx7V嘉泰姆
voltage down to 0.7V. The CXSU63133 is suitable for por-x7V嘉泰姆
table battery-powered applications. Consuming only 11μAx7V嘉泰姆
quiescent current and an optimized control scheme al-x7V嘉泰姆
lows the device to operate at very high efficiency over thex7V嘉泰姆
entire load current range.x7V嘉泰姆

二.产品特点(Features)x7V嘉泰姆

1.)0.9V Typical Start-up Input Voltagex7V嘉泰姆
2.)11μA Typical No Load Quiescent Currentx7V嘉泰姆
3.)PFM Operationx7V嘉泰姆
4.)High Efficiency up to 92%x7V嘉泰姆
5.)Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5Vx7V嘉泰姆
6.)Output Voltagex7V嘉泰姆
7.)600mA Internal Switch Currentx7V嘉泰姆
8.)Internal Synchronous Rectifierx7V嘉泰姆
9.)SOT-89 Packagex7V嘉泰姆
10.)Lead Free and Green Devices Availablex7V嘉泰姆
(RoHS Compliant)x7V嘉泰姆
三,应用范围 (Applications)x7V嘉泰姆

Toyx7V嘉泰姆

Wireless Mousex7V嘉泰姆
Portable Instrumentx7V嘉泰姆
四.下载产品资料PDF文档 x7V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！x7V嘉泰姆

 x7V嘉泰姆

五,产品封装图 (Package)x7V嘉泰姆
x7V嘉泰姆
六.电路原理图x7V嘉泰姆

x7V嘉泰姆
七,功能概述x7V嘉泰姆

Inductor Selectionx7V嘉泰姆
The inductor value determines the inductor ripple currentx7V嘉泰姆
and affects the load transient response. It is recom-x7V嘉泰姆
mended to select the boost inductor in order to keep thex7V嘉泰姆
maximum peak inductor current below the current limitx7V嘉泰姆
threshold of the power switch. For example, the currentx7V嘉泰姆
limit threshold of the CXSU63133’s switch is 600mA. Forx7V嘉泰姆
choosing an inductor which has peak current passed,x7V嘉泰姆
firstly, it is necessary to consider the output load (IOUT),x7V嘉泰姆
input (VIN), and output voltage (VOUT). Secondly, the de-x7V嘉泰姆
sired current ripple in the inductor also needed to bex7V嘉泰姆
taken into account. The current was calculated in “Outputx7V嘉泰姆
Capacitor Selection”. Since the output ripple is the prod-x7V嘉泰姆
uct of the peak inductor current and the output capacitorx7V嘉泰姆
ESR, the larger inductor value reduces the inductor cur-x7V嘉泰姆
rent ripple and output voltage ripple but typically offers ax7V嘉泰姆
larger physical size.x7V嘉泰姆

Control Schemex7V嘉泰姆
The converter monitors the output voltage. When the in-x7V嘉泰姆
ternal feedback voltage falls below the reference voltage,x7V嘉泰姆
the main switch turns on and the inductor current rampsx7V嘉泰姆
up. The main switch turns off when the current reachesx7V嘉泰姆
the peak current limit of typical 600mA. The second crite-x7V嘉泰姆
rion that turns off the switch is the maximum on-time ofx7V嘉泰姆
4μs (typical). As the main switch is turned off, the syn-x7V嘉泰姆
chronous switch is turned on and delivers the current tox7V嘉泰姆
the output. The main switch remains off for a minimum ofx7V嘉泰姆
900ns (typical), or until the internal feedback voltage dropsx7V嘉泰姆
below the reference voltage. By the control scheme withx7V嘉泰姆
low quiescent current of 11μA (typical), the converter getsx7V嘉泰姆
high efficiency over a wide load range. x7V嘉泰姆
Start-Upx7V嘉泰姆
A startup oscillator circuit is integrated in the CXSU63133.x7V嘉泰姆
When the power is applied to the device, the circuit pumpsx7V嘉泰姆
the output voltage high. Once the output voltage reachesx7V嘉泰姆
1.4V (typ), the main DC-DC circuitry turns on and boostsx7V嘉泰姆
the output voltage to the final regulation point.x7V嘉泰姆
Synchronous Rectificationx7V嘉泰姆
The internal synchronous rectifier eliminates the needx7V嘉泰姆
for an external Schottky diode, thus, reducing cost andx7V嘉泰姆
board space. During the cycle off-time, the P-channelx7V嘉泰姆
MOSFET turns on and shunts the MOSFET body diode.x7V嘉泰姆
As a result, the synchronous rectifier significantly improvesx7V嘉泰姆
efficiency without the addition of an external component.x7V嘉泰姆
Conversion efficiency can be as high as 92%. x7V嘉泰姆
Over-Temperature Protectionx7V嘉泰姆
The over-temperature circuit limits the junction tempera-x7V嘉泰姆
ture of the CXSU63133. When the junction temperature ex-x7V嘉泰姆
ceeds 150°C, a thermal sensor turns off the powerx7V嘉泰姆
MOSFETs, allowing the devices to cool. The thermal sen-x7V嘉泰姆
sor allows the converter to start a start-up process andx7V嘉泰姆
regulate the output voltage again after the junction tem-x7V嘉泰姆
perature cools by 40°C. The OTP is designed with a 40°Cx7V嘉泰姆
hysteresis to lower the average TJ during continuous ther-x7V嘉泰姆
mal overload conditions, increasing lifetime of the device.x7V嘉泰姆

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