目录3XQ嘉泰姆

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

一,产品概述(General Description)         3XQ嘉泰姆

The CXSU63133 is a compact, PFM mode, and step-up3XQ嘉泰姆

DC-DC converter with low quiescent current. The inter-3XQ嘉泰姆
nal synchronous rectifier reduces cost and PCB space3XQ嘉泰姆
by eliminating the need for an external Schottky diode.3XQ嘉泰姆
Low on-resistance of the internal switches improves the3XQ嘉泰姆
efficiency up to 92%. The start-up voltage is guaranteed3XQ嘉泰姆
below 1V. After start-up, the device can operate with input3XQ嘉泰姆
voltage down to 0.7V. The CXSU63133 is suitable for por-3XQ嘉泰姆
table battery-powered applications. Consuming only 11μA3XQ嘉泰姆
quiescent current and an optimized control scheme al-3XQ嘉泰姆
lows the device to operate at very high efficiency over the3XQ嘉泰姆
entire load current range.3XQ嘉泰姆

二.产品特点(Features)3XQ嘉泰姆

1.)0.9V Typical Start-up Input Voltage3XQ嘉泰姆
2.)11μA Typical No Load Quiescent Current3XQ嘉泰姆
3.)PFM Operation3XQ嘉泰姆
4.)High Efficiency up to 92%3XQ嘉泰姆
5.)Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5V3XQ嘉泰姆
6.)Output Voltage3XQ嘉泰姆
7.)600mA Internal Switch Current3XQ嘉泰姆
8.)Internal Synchronous Rectifier3XQ嘉泰姆
9.)SOT-89 Package3XQ嘉泰姆
10.)Lead Free and Green Devices Available3XQ嘉泰姆
(RoHS Compliant)3XQ嘉泰姆
三,应用范围 (Applications)3XQ嘉泰姆

Toy3XQ嘉泰姆

Wireless Mouse3XQ嘉泰姆
Portable Instrument3XQ嘉泰姆
四.下载产品资料PDF文档 3XQ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！3XQ嘉泰姆

 3XQ嘉泰姆

五,产品封装图 (Package)3XQ嘉泰姆
3XQ嘉泰姆
六.电路原理图3XQ嘉泰姆

3XQ嘉泰姆
七,功能概述3XQ嘉泰姆

Inductor Selection3XQ嘉泰姆
The inductor value determines the inductor ripple current3XQ嘉泰姆
and affects the load transient response. It is recom-3XQ嘉泰姆
mended to select the boost inductor in order to keep the3XQ嘉泰姆
maximum peak inductor current below the current limit3XQ嘉泰姆
threshold of the power switch. For example, the current3XQ嘉泰姆
limit threshold of the CXSU63133’s switch is 600mA. For3XQ嘉泰姆
choosing an inductor which has peak current passed,3XQ嘉泰姆
firstly, it is necessary to consider the output load (IOUT),3XQ嘉泰姆
input (VIN), and output voltage (VOUT). Secondly, the de-3XQ嘉泰姆
sired current ripple in the inductor also needed to be3XQ嘉泰姆
taken into account. The current was calculated in “Output3XQ嘉泰姆
Capacitor Selection”. Since the output ripple is the prod-3XQ嘉泰姆
uct of the peak inductor current and the output capacitor3XQ嘉泰姆
ESR, the larger inductor value reduces the inductor cur-3XQ嘉泰姆
rent ripple and output voltage ripple but typically offers a3XQ嘉泰姆
larger physical size.3XQ嘉泰姆

Control Scheme3XQ嘉泰姆
The converter monitors the output voltage. When the in-3XQ嘉泰姆
ternal feedback voltage falls below the reference voltage,3XQ嘉泰姆
the main switch turns on and the inductor current ramps3XQ嘉泰姆
up. The main switch turns off when the current reaches3XQ嘉泰姆
the peak current limit of typical 600mA. The second crite-3XQ嘉泰姆
rion that turns off the switch is the maximum on-time of3XQ嘉泰姆
4μs (typical). As the main switch is turned off, the syn-3XQ嘉泰姆
chronous switch is turned on and delivers the current to3XQ嘉泰姆
the output. The main switch remains off for a minimum of3XQ嘉泰姆
900ns (typical), or until the internal feedback voltage drops3XQ嘉泰姆
below the reference voltage. By the control scheme with3XQ嘉泰姆
low quiescent current of 11μA (typical), the converter gets3XQ嘉泰姆
high efficiency over a wide load range. 3XQ嘉泰姆
Start-Up3XQ嘉泰姆
A startup oscillator circuit is integrated in the CXSU63133.3XQ嘉泰姆
When the power is applied to the device, the circuit pumps3XQ嘉泰姆
the output voltage high. Once the output voltage reaches3XQ嘉泰姆
1.4V (typ), the main DC-DC circuitry turns on and boosts3XQ嘉泰姆
the output voltage to the final regulation point.3XQ嘉泰姆
Synchronous Rectification3XQ嘉泰姆
The internal synchronous rectifier eliminates the need3XQ嘉泰姆
for an external Schottky diode, thus, reducing cost and3XQ嘉泰姆
board space. During the cycle off-time, the P-channel3XQ嘉泰姆
MOSFET turns on and shunts the MOSFET body diode.3XQ嘉泰姆
As a result, the synchronous rectifier significantly improves3XQ嘉泰姆
efficiency without the addition of an external component.3XQ嘉泰姆
Conversion efficiency can be as high as 92%. 3XQ嘉泰姆
Over-Temperature Protection3XQ嘉泰姆
The over-temperature circuit limits the junction tempera-3XQ嘉泰姆
ture of the CXSU63133. When the junction temperature ex-3XQ嘉泰姆
ceeds 150°C, a thermal sensor turns off the power3XQ嘉泰姆
MOSFETs, allowing the devices to cool. The thermal sen-3XQ嘉泰姆
sor allows the converter to start a start-up process and3XQ嘉泰姆
regulate the output voltage again after the junction tem-3XQ嘉泰姆
perature cools by 40°C. The OTP is designed with a 40°C3XQ嘉泰姆
hysteresis to lower the average TJ during continuous ther-3XQ嘉泰姆
mal overload conditions, increasing lifetime of the device.3XQ嘉泰姆

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