目录srY嘉泰姆

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

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

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

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

二.产品特点(Features)srY嘉泰姆

1.)0.9V Typical Start-up Input VoltagesrY嘉泰姆
2.)11μA Typical No Load Quiescent CurrentsrY嘉泰姆
3.)PFM OperationsrY嘉泰姆
4.)High Efficiency up to 92%srY嘉泰姆
5.)Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5VsrY嘉泰姆
6.)Output VoltagesrY嘉泰姆
7.)600mA Internal Switch CurrentsrY嘉泰姆
8.)Internal Synchronous RectifiersrY嘉泰姆
9.)SOT-89 PackagesrY嘉泰姆
10.)Lead Free and Green Devices AvailablesrY嘉泰姆
(RoHS Compliant)srY嘉泰姆
三,应用范围 (Applications)srY嘉泰姆

ToysrY嘉泰姆

Wireless MousesrY嘉泰姆
Portable InstrumentsrY嘉泰姆
四.下载产品资料PDF文档 srY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！srY嘉泰姆

 srY嘉泰姆

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

srY嘉泰姆
七,功能概述srY嘉泰姆

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

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

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