目录j9q嘉泰姆

1.产品概述                       2.产品特点j9q嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 j9q嘉泰姆
5.产品封装图                     6.电路原理图                   j9q嘉泰姆
7.功能概述                        8.相关产品j9q嘉泰姆

一,产品概述(General Description)         j9q嘉泰姆

The CXSU63133 is a compact, PFM mode, and step-upj9q嘉泰姆

DC-DC converter with low quiescent current. The inter-j9q嘉泰姆
nal synchronous rectifier reduces cost and PCB spacej9q嘉泰姆
by eliminating the need for an external Schottky diode.j9q嘉泰姆
Low on-resistance of the internal switches improves thej9q嘉泰姆
efficiency up to 92%. The start-up voltage is guaranteedj9q嘉泰姆
below 1V. After start-up, the device can operate with inputj9q嘉泰姆
voltage down to 0.7V. The CXSU63133 is suitable for por-j9q嘉泰姆
table battery-powered applications. Consuming only 11μAj9q嘉泰姆
quiescent current and an optimized control scheme al-j9q嘉泰姆
lows the device to operate at very high efficiency over thej9q嘉泰姆
entire load current range.j9q嘉泰姆

二.产品特点(Features)j9q嘉泰姆

1.)0.9V Typical Start-up Input Voltagej9q嘉泰姆
2.)11μA Typical No Load Quiescent Currentj9q嘉泰姆
3.)PFM Operationj9q嘉泰姆
4.)High Efficiency up to 92%j9q嘉泰姆
5.)Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5Vj9q嘉泰姆
6.)Output Voltagej9q嘉泰姆
7.)600mA Internal Switch Currentj9q嘉泰姆
8.)Internal Synchronous Rectifierj9q嘉泰姆
9.)SOT-89 Packagej9q嘉泰姆
10.)Lead Free and Green Devices Availablej9q嘉泰姆
(RoHS Compliant)j9q嘉泰姆
三,应用范围 (Applications)j9q嘉泰姆

Toyj9q嘉泰姆

Wireless Mousej9q嘉泰姆
Portable Instrumentj9q嘉泰姆
四.下载产品资料PDF文档 j9q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！j9q嘉泰姆

 j9q嘉泰姆

五,产品封装图 (Package)j9q嘉泰姆
j9q嘉泰姆
六.电路原理图j9q嘉泰姆

j9q嘉泰姆
七,功能概述j9q嘉泰姆

Inductor Selectionj9q嘉泰姆
The inductor value determines the inductor ripple currentj9q嘉泰姆
and affects the load transient response. It is recom-j9q嘉泰姆
mended to select the boost inductor in order to keep thej9q嘉泰姆
maximum peak inductor current below the current limitj9q嘉泰姆
threshold of the power switch. For example, the currentj9q嘉泰姆
limit threshold of the CXSU63133’s switch is 600mA. Forj9q嘉泰姆
choosing an inductor which has peak current passed,j9q嘉泰姆
firstly, it is necessary to consider the output load (IOUT),j9q嘉泰姆
input (VIN), and output voltage (VOUT). Secondly, the de-j9q嘉泰姆
sired current ripple in the inductor also needed to bej9q嘉泰姆
taken into account. The current was calculated in “Outputj9q嘉泰姆
Capacitor Selection”. Since the output ripple is the prod-j9q嘉泰姆
uct of the peak inductor current and the output capacitorj9q嘉泰姆
ESR, the larger inductor value reduces the inductor cur-j9q嘉泰姆
rent ripple and output voltage ripple but typically offers aj9q嘉泰姆
larger physical size.j9q嘉泰姆

Control Schemej9q嘉泰姆
The converter monitors the output voltage. When the in-j9q嘉泰姆
ternal feedback voltage falls below the reference voltage,j9q嘉泰姆
the main switch turns on and the inductor current rampsj9q嘉泰姆
up. The main switch turns off when the current reachesj9q嘉泰姆
the peak current limit of typical 600mA. The second crite-j9q嘉泰姆
rion that turns off the switch is the maximum on-time ofj9q嘉泰姆
4μs (typical). As the main switch is turned off, the syn-j9q嘉泰姆
chronous switch is turned on and delivers the current toj9q嘉泰姆
the output. The main switch remains off for a minimum ofj9q嘉泰姆
900ns (typical), or until the internal feedback voltage dropsj9q嘉泰姆
below the reference voltage. By the control scheme withj9q嘉泰姆
low quiescent current of 11μA (typical), the converter getsj9q嘉泰姆
high efficiency over a wide load range. j9q嘉泰姆
Start-Upj9q嘉泰姆
A startup oscillator circuit is integrated in the CXSU63133.j9q嘉泰姆
When the power is applied to the device, the circuit pumpsj9q嘉泰姆
the output voltage high. Once the output voltage reachesj9q嘉泰姆
1.4V (typ), the main DC-DC circuitry turns on and boostsj9q嘉泰姆
the output voltage to the final regulation point.j9q嘉泰姆
Synchronous Rectificationj9q嘉泰姆
The internal synchronous rectifier eliminates the needj9q嘉泰姆
for an external Schottky diode, thus, reducing cost andj9q嘉泰姆
board space. During the cycle off-time, the P-channelj9q嘉泰姆
MOSFET turns on and shunts the MOSFET body diode.j9q嘉泰姆
As a result, the synchronous rectifier significantly improvesj9q嘉泰姆
efficiency without the addition of an external component.j9q嘉泰姆
Conversion efficiency can be as high as 92%. j9q嘉泰姆
Over-Temperature Protectionj9q嘉泰姆
The over-temperature circuit limits the junction tempera-j9q嘉泰姆
ture of the CXSU63133. When the junction temperature ex-j9q嘉泰姆
ceeds 150°C, a thermal sensor turns off the powerj9q嘉泰姆
MOSFETs, allowing the devices to cool. The thermal sen-j9q嘉泰姆
sor allows the converter to start a start-up process andj9q嘉泰姆
regulate the output voltage again after the junction tem-j9q嘉泰姆
perature cools by 40°C. The OTP is designed with a 40°Cj9q嘉泰姆
hysteresis to lower the average TJ during continuous ther-j9q嘉泰姆
mal overload conditions, increasing lifetime of the device.j9q嘉泰姆

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