目录tsQ嘉泰姆

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

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

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

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

二.产品特点(Features)tsQ嘉泰姆

1.)0.9V Typical Start-up Input VoltagetsQ嘉泰姆
2.)11μA Typical No Load Quiescent CurrenttsQ嘉泰姆
3.)PFM OperationtsQ嘉泰姆
4.)High Efficiency up to 92%tsQ嘉泰姆
5.)Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5VtsQ嘉泰姆
6.)Output VoltagetsQ嘉泰姆
7.)600mA Internal Switch CurrenttsQ嘉泰姆
8.)Internal Synchronous RectifiertsQ嘉泰姆
9.)SOT-89 PackagetsQ嘉泰姆
10.)Lead Free and Green Devices AvailabletsQ嘉泰姆
(RoHS Compliant)tsQ嘉泰姆
三,应用范围 (Applications)tsQ嘉泰姆

ToytsQ嘉泰姆

Wireless MousetsQ嘉泰姆
Portable InstrumenttsQ嘉泰姆
四.下载产品资料PDF文档 tsQ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！tsQ嘉泰姆

 tsQ嘉泰姆

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

tsQ嘉泰姆
七,功能概述tsQ嘉泰姆

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

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

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